CN108282309A - Reference signal transmission method and apparatus - Google Patents

Abstract

The present application proposes a method and device for transmitting a reference signal. The method includes: the sending device transforms the reference signal in the frequency domain into the time domain to generate a reference signal in the time domain, wherein the reference signal in the frequency domain includes information mapped to The first reference signal sequence and at least one second reference signal sequence on N frequency domain resource groups with the same length, the first reference signal sequence is a frequency domain constant amplitude sequence, and the second reference signal sequence is the first reference signal sequence A reference signal sequence after linear phase rotation, where N is an integer greater than 1; sending the time domain reference signal. The reference signal transmission method of the present application can improve data transmission performance by sending a low PAPR/RCM reference signal.

Description

Reference signal transmission method and device

technical field

The present application relates to the communication field, in particular to reference signal design technology in a wireless communication system.

Background technique

In a wireless communication system, a reference signal (Reference Signal, RS), also called a pilot signal, is a predefined signal sent by a sending device to a receiving device on a predefined resource. The receiving device can obtain channel-related information according to the received reference signal, and complete channel estimation or channel measurement. The channel measurement result can be used for resource scheduling and link adaptation, and the channel estimation result can be used for the receiving device to demodulate the data. Generally, in order to accurately obtain channel related information, different reference signals need to be orthogonal. Usually, multiple reference signals that are orthogonal to each other can be provided by means of time division, frequency division or code division. In a long term evolution (LTE) system, the uplink reference signal includes an uplink demodulation reference signal (demodulation reference signal, DMRS) and an uplink sounding reference signal (sounding reference signal, SRS), and the downlink reference signal includes a cell-specific reference signal (cell-specific reference signal, CRS), downlink DMRS, channel state information reference signal (CSI-RS), multimedia broadcast multicast single frequency network reference signal (multimediabroadcast multicast service single frequency network reference signal, MBSFNRS) And a positioning reference signal (positioning reference signal, PRS).

In the LTE system, there are two methods for resource multiplexing between user equipment (UEs). One is that the time-frequency resources between UEs do not overlap at all, and resource multiplexing is performed by time division or frequency division; The other is that time-frequency resources between UEs are completely overlapped, and resource multiplexing is performed in a space division manner. When the resources between UEs are multiplexed by time division or frequency division, the reference signals of different UEs are also orthogonal by time division or frequency division; when the resources between UEs are multiplexed by space division , the reference signals of different UEs can be mutually orthogonal through time division, frequency division, orthogonal cover code (OCC) in the time domain or frequency domain, or can be mutually orthogonal through different linear phase rotations of the same sequence pay.

In the new air interface (new radio, NR) of the fifth generation (5 ^th generation, 5G) mobile communication system, for the scenario where multiple UEs or multiple transmit ports share the same or part of the same time-frequency resources, a block reference is proposed The method of blockreference signals is used to improve the orthogonality between reference signals of different UEs or different transmit ports. The block reference signal scheme divides the reference signal of each UE into multiple blocks, and the reference signals of different UEs are guaranteed to be orthogonal within the block, thereby ensuring the overall orthogonality of the reference signals of different UEs. After the block reference signal is introduced, the time-frequency resources of two UEs can be shared at the granularity of the block size, without requiring the time-frequency resources of two UEs to be space-division multiplexed to completely overlap, so that the resource allocation between UEs more flexible.

However, the introduction of the block reference signal will lead to an increase in the peak-to-average powerratio (PAPR) and the original cubic metric (Raw Cubic Metric, RCM) of the reference signal, which will further cause the cell edge users to transmit When the power is limited, the measurement accuracy of the channel-related information by the receiving device is reduced, and the data transmission performance is reduced. .

Contents of the invention

The present application provides a method and device for data transmission, which are used to reduce the PAPR/RCM of the block reference signal, thereby improving data transmission performance.

In a first aspect, a method for generating a frequency-domain reference signal is provided, including: assigning a reference signal sequence to a reference signal, where the reference signal sequence includes a first reference signal sequence and at least one second reference signal sequence, wherein the first reference The signal sequence is a constant-amplitude sequence in the frequency domain, and the second reference signal sequence is a sequence after the linear phase rotation of the first reference signal sequence; the above-mentioned reference signal sequences are respectively mapped to the frequency domain resources allocated to the reference signal to generate a frequency domain reference signal, wherein the frequency domain resource allocated to the reference signal includes N frequency domain resource groups, where N is an integer greater than 1.

The reference signal generated by the method has low PAPR/RCM characteristics, and when the reference signal is applied to a communication system, data transmission performance can be improved. The generation of the reference signal may be implemented in a module of the sending device, or may be implemented in a module of the receiving device.

In a possible implementation manner of the first aspect, the sequence mapped to the n+1th frequency domain resource group is a sequence after linear phase rotation of the sequence mapped to the nth frequency domain resource group , wherein, the nth frequency domain resource group and the n+1th frequency domain resource group are two frequency domain resource groups in the N frequency domain resource groups with the same length.

In a possible implementation manner of the first aspect, the value of the phase of the linear phase rotation is associated with the number N of the frequency domain resource groups.

In a possible implementation manner of the first aspect, when the number N of the frequency domain resource groups is an even number, the phase of the linear phase rotation is α=(2d+1)·π, where d is an integer.

In a possible implementation manner of the first aspect, when the number N of the frequency domain resource groups is an odd number, the phase of the linear phase rotation is α=2d·π, where d is an integer.

In a possible implementation of the first aspect, the reference signal sequence mapped to the qth frequency domain resource group in the pth resource group cluster among the N frequency domain resource groups is defined as R(p K+q,m), where p and q are integers greater than or equal to zero, K is an integer greater than 1, m is the serial number of an element of the reference signal sequence, m is an integer and 0≤m≤M-1, and M is The length of the reference signal sequence, p K+q<N, q is the serial number of the frequency domain resource group in the resource group cluster and 0≤q≤K-1; mapped to each frequency domain resource group in the pth resource group cluster The reference signal sequence R(p·K+q,m) on is the same as the reference signal sequence R(q,m) mapped to each frequency domain resource group in the 0th resource group cluster, where p is greater than zero; for The 0th resource group cluster, the reference signal sequence R(q,m) mapped to the qth frequency domain resource group is the phase rotation of the reference signal sequence R(0,m) mapped to the 0th frequency domain resource group after the sequence, Among them, j is the imaginary number unit, q≥1, and α _q is the reference signal sequence mapped to the qth frequency domain resource group in the 0th resource group cluster relative to the reference signal sequence mapped to the 0th resource group cluster in the 0th resource group cluster The phase of the linear phase rotation of the reference signal sequence on frequency domain resource groups, α _q is a real number.

In a possible implementation manner of the first aspect, the N sequences are respectively multiplied by N complex coefficients, and then the N sequences multiplied by the complex coefficients are respectively mapped to the N frequency domain resources In group, the reference signal in the frequency domain is obtained, wherein the magnitudes of the N complex coefficients are all 1.

In a second aspect, a method for transmitting a reference signal is provided, including: a sending device transforms a reference signal in the frequency domain into a time domain to generate a reference signal in the time domain, wherein the reference signal in the frequency domain includes information mapped to N A first reference signal sequence and at least one second reference signal sequence on frequency domain resource groups with the same length, the first reference signal sequence is a frequency domain constant amplitude sequence, and the second reference signal sequence is the first reference signal sequence The signal sequence is a sequence after linear phase rotation, where N is an integer greater than 1; the time domain reference signal is sent.

In a possible implementation manner of the second aspect, the sending device generates the above reference signal in the frequency domain by using the method in the first aspect or any possible implementation manner of the first aspect.

In a third aspect, a method for transmitting a reference signal is provided, including: receiving a reference signal in the time domain; transforming the reference signal in the time domain into a frequency domain to generate a reference signal in the frequency domain, wherein the reference signal in the frequency domain includes A first reference signal sequence and at least one second reference signal sequence respectively mapped to N frequency domain resource groups of the same length, the first reference signal sequence is a frequency domain constant amplitude sequence, and the second reference signal sequence is The sequence of the first reference signal sequence after linear phase rotation, N is an integer greater than 1.

In a possible implementation manner of the third aspect, the receiving device generates the above reference signal in the frequency domain by using the method in the first aspect or any possible implementation manner of the first aspect.

In a fourth aspect, a device is provided, including a module for executing the method in the first aspect or any possible implementation manner of the first aspect.

In a fifth aspect, a communication device is provided, including a processing unit and a sending unit, so as to execute the method in the second aspect or any possible implementation manner of the second aspect.

In a sixth aspect, a communication device is provided, including a processor, a memory, and a transceiver, so as to execute the method in the second aspect or any possible implementation manner of the second aspect.

In a seventh aspect, a communication device is provided, including a processing unit and a sending unit, so as to execute the method in the third aspect or any possible implementation manner of the third aspect.

In an eighth aspect, a communication device is provided, including a processor, a memory, and a transceiver, so as to execute the method in the third aspect or any possible implementation manner of the third aspect.

In the ninth aspect, there is provided a computer-readable storage medium, the computer-readable storage medium stores instructions, and when it is run on a computer, the computer executes the first aspect or any possible implementation of the first aspect methods in methods.

In a tenth aspect, a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer executes the second aspect or any possible implementation of the second aspect methods in methods.

In the eleventh aspect, a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer executes the third aspect or any possible method of the third aspect. method in the implementation.

In a twelfth aspect, there is provided a computer program product containing instructions, which when run on a computer, causes the computer to execute the method in the first aspect or any possible implementation manner of the first aspect.

In a thirteenth aspect, there is provided a computer program product containing instructions, which when run on a computer, causes the computer to execute the method in the second aspect or any possible implementation manner of the second aspect.

In a fourteenth aspect, there is provided a computer program product containing instructions, which when run on a computer, causes the computer to execute the method in the third aspect or any possible implementation manner of the third aspect.

Description of drawings

FIG. 1 is a schematic structural diagram of a communication system applied in an embodiment of the present application;

Fig. 2 is a schematic diagram of generating a reference signal sequence through cyclic extension or truncation of a ZC sequence provided by an embodiment of the present application;

FIG. 3 is a schematic flowchart of a method for generating a frequency domain reference signal provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of a frequency-domain resource group including M minimum time-frequency resource units provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of N frequency domain resource groups provided by an embodiment of the present application;

FIG. 6 is a schematic diagram of block reference signal transmission provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of block reference signal transmission with phase rotation provided by an embodiment of the present application;

FIG. 8 is a schematic diagram of another block reference signal transmission with phase rotation provided by an embodiment of the present application;

FIG. 9 is a schematic flowchart of a reference signal transmission method applied to a sending device provided by an embodiment of the present application;

FIG. 10 is a schematic flowchart of a reference signal transmission method applied to a receiving device provided by an embodiment of the present application;

FIG. 11 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

FIG. 12 is a schematic structural diagram of another communication device provided by an embodiment of the present application;

FIG. 13 is a schematic structural diagram of another communication device provided by an embodiment of the present application;

FIG. 14 is a schematic structural diagram of another communication device provided by an embodiment of the present application.

Detailed ways

The sending device and the receiving device in each embodiment of the present application may be any kind of sending-end device and receiving-end device that perform data transmission in a wireless manner. The sending device and the receiving device can be any kind of device with wireless transceiver function, including but not limited to: base station (for example, base station NodeB, evolved base station eNodeB, base station in the fifth generation (the fifth generation, 5G) communication system, future A base station or a network device in a communication system, an access node, a wireless relay node, a wireless backhaul node) in a WiFi system, and a user equipment (user equipment, UE). Wherein, the UE may also be called a terminal terminal, a mobile station (mobile station, MS), a mobile terminal (mobile terminal, MT) and so on. The UE can communicate with one or more core networks via the radio access network (RAN), or access the distributed network in an ad hoc or authorization-free manner, and the UE can also access the wireless network in other ways For communication, the UE may also directly perform wireless communication with other UEs, which is not limited in this embodiment of the present application.

The sending device and receiving device in the embodiments of the present application can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on airplanes, balloons and satellites in the air. The UE in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (Virtual Reality, VR) terminal device, an augmented reality (Augmented Reality, AR) terminal device , wireless terminals in industrial control, wireless terminals in self driving, wireless terminals in remote medical, wireless terminals in smart grid, transportation safety ), a wireless terminal in a smart city, a wireless terminal in a smart home, and the like. The embodiments of the present application do not limit the application scenarios.

FIG. 1 is a schematic structural diagram of a communication system applied in an embodiment of the present application. As shown in FIG. 1, the communication system includes a core network device 110, a base station 120, a UE 130 and a UE 140 connected by wireless connection or wired connection or other means, and the UE 130 and UE 140 may be stationary or mobile. FIG. 1 is only a schematic diagram, and the communication system may also include other network devices and/or other terminal devices, which are not shown in FIG. 1 .

The embodiments of the present application may be applicable to downlink data transmission, uplink data transmission, or device-to-device (device to device, D2D) data transmission. For example, for downlink data transmission, the sending device is a base station, and the corresponding receiving device is a UE; for uplink data transmission, the sending device is a UE, and the corresponding receiving device is a base station; for D2D data transmission, the sending device is a UE, and the corresponding receiving device is a UE. A device is also a UE. The embodiments of the present application do not limit this.

In order to reduce the PAPR/RCM when the sending device sends the reference signal, a constant amplitude (constant amplitude) sequence may be selected as the reference signal sequence, and the constant amplitude sequence is also called a constant envelope sequence. For example, Zadoff-Chu (ZC) sequences and quadrature phase shift keying (quadrature phase shift keying, QPSK) sequences are used for uplink reference signals in a long term evolution (longterm evolution, LTE) system.

Taking the application of the ZC sequence in the uplink reference signal of the LTE system as an example, a brief introduction is made to the process of generating the reference signal sequence from the ZC sequence.

The u-th root sequence of a ZC sequence of length M _ZC is defined as:

Among them, u is a positive integer smaller than M _ZC and relatively prime to M _ZC , u is called the root of the ZC sequence, k is an integer, and j is an imaginary number unit. The ZC sequence determined by u can also be called the u-th ZC root sequence of length M _ZC . The ZC sequence has good autocorrelation, that is, the sequence has a large autocorrelation peak. There is a good cross-correlation between two ZC sequences with the same length but different roots, that is, the value of the cross-correlation is small. In order to maximize the number of root sequences of the ZC sequence whose length is M _ZC , usually M _ZC is taken as a prime number. However, in the embodiment of the present application, M _ZC may be a prime number or a non-prime number, which is not limited in the embodiment of the present application.

It can be understood that for the numbering of the array or sequence, such as the value of k above, there may be different numbering methods, and the numbering may start from 1 or start from zero, which is not limited in this embodiment of the present application.

When the length of the reference signal sequence is inconsistent with the ZC sequence, the base sequence (base sequence) of the reference signal sequence can be generated according to the ZC sequence X _u (k) As shown in formula (2):

Wherein, m is the element number of the base sequence, m is an integer and 0≤m<M, M is the length of the base sequence, and M is an integer greater than 1. As shown in (a) in Figure 2, when M is greater than M _ZC , formula (2) can be understood as the base sequence of length M is obtained by cyclically extending the ZC sequence of length M _ZC ; as shown in Figure 2 As shown in (b), when M is smaller than M _ZC , the formula (2) can be understood as truncating the ZC sequence with a length of M _ZC to obtain a base sequence with a length of M.

For example, in order to generate a base sequence of a reference signal with a length of 48, it can be obtained by cyclic extension of a ZC sequence with a length of 47. A set of basic reference signal sequences obtained by cyclically extending ZC sequences with the same length but different roots, and the cross-correlation between these basic reference signal sequences is small but not zero.

In order to further obtain more reference signal sequences, different frequency-domain linear phase rotations (linear phase rotation) may be performed on the base sequence of the reference signal sequences. Different reference signal sequences obtained by performing different linear phase rotations on the base sequence of the same reference signal sequence are completely orthogonal, so there is no interference between these reference signal sequences obtained through linear phase rotation. sequence After linear phase rotation, the sequence R _u,α (m) is obtained, as shown in formula (3):

Among them, α is the phase of linear phase rotation, α is a real number, assuming α=(c·π)/6, then the value of c can be from 0 to 11, so that from a basic reference signal sequence through different phase rotations can be 12 different mutually orthogonal reference signal sequences are obtained. Performing a linear phase rotation in the frequency domain is equivalent to performing a cyclic shift in the time domain, and the displacement of the cyclic shift is determined by the phase of the linear phase rotation.

It can be understood that, the above-mentioned process of generating a reference signal sequence from a ZC sequence is also applicable to other constant-amplitude sequences, and details are not described here.

As shown in FIG. 3 , the embodiment of the present application provides a method for generating a frequency domain reference signal. The reference signal generated by the method has low PAPR/RCM characteristics, and when the reference signal is applied to a communication system, data transmission performance can be improved. The generation of the reference signal may be implemented in a module of the sending device, or may be implemented in a module of the receiving device.

S310. Allocate a reference signal sequence for the reference signal, where the reference signal sequence includes a first reference signal sequence and at least one second reference signal sequence, where the first reference signal sequence is a frequency domain constant amplitude sequence, and the second reference signal sequence is the first reference signal sequence A sequence after linear phase rotation of the reference signal sequence.

It can be understood that the reference signal may be allocated to the wireless link between the sending device and the receiving device, or may be allocated to a specific antenna port (port) of the sending device.

Taking the ZC sequence as an example, the first reference signal sequence may be the base sequence of the reference signal sequence determined by the above formula (2), or may be a linear phase rotation sequence based on the base sequence determined by the above formula (3); The second reference signal sequence is a sequence after linear phase rotation of the first reference signal sequence. When both the first reference signal sequence and the second reference signal sequence are linearly phase-rotated sequences of the base sequence, the rotation phase of the linear phase rotation of the first reference signal sequence is different from that of the second reference signal sequence. There may be one or more second reference signal sequences. When there are multiple second reference signal sequences, the multiple second reference signal sequences may be identical, or different, or partially identical. For example, the second reference signal sequence may be a sequence obtained after phase rotation based on the base sequence, and is reused multiple times. For another example, the second reference signal sequence may be a sequence obtained through the same phase rotation based on the base sequence. For another example, the second reference signal sequence may also be a different sequence obtained through different phase rotations based on the base sequence.

The reference signal sequence allocated for the reference signal includes N sequences, where N is an integer greater than 1. That is to say, there are N total number of first reference signal sequences and second reference signal sequences. For example, one first reference signal sequence and N-1 second reference signal sequences may be allocated to the reference signal. The N-1 second reference signal sequences may be the same sequence, or different sequences, or partly the same sequence.

Assume that the first reference signal sequence is represented by R ₁ (m), and the second reference signal sequence is represented by R ₂ (m), where m is the element number of the sequence, m is an integer and 0≤m≤M-1, the first reference Both the length of the signal sequence and the second reference signal sequence are M. The relationship between the second reference signal sequence and the first reference signal sequence can be expressed by formula (4):

R ₂ (m) = e ^j·α·m R ₁ (m) (4)

Among them, α is the phase of linear phase rotation, and α is a real number.

It can be understood that, the embodiment of the present application does not limit the specific sequence type of the frequency-domain constant-amplitude sequence, which may be a ZC sequence, a QPSK sequence, or other frequency-domain constant-amplitude sequences.

S320, respectively map the above reference signal sequence to the frequency domain resource allocated to the reference signal to generate a frequency domain reference signal, wherein the frequency domain resource allocated to the reference signal includes N frequency domain resource groups, and N is greater than 1 an integer of .

Each frequency-domain resource group includes M minimum time-frequency resource units in one time-domain symbol, where M is an integer greater than 1. Wherein, the time-domain symbol may be an orthogonal frequency division multiplexing (OFDM) symbol, or a single carrier frequency division multiple access (SC-FDMA) symbol; the minimum time-frequency resource unit is Different systems may have different definitions, for example, in an LTE system, the smallest time-frequency resource unit is a resource element (resource element, RE).

A sequence is selected from the first reference signal sequence and at least one second reference signal sequence to be mapped to one frequency domain resource group among the N frequency domain resource groups. The M elements in the sequence are respectively mapped to M minimum time-frequency resource units in the frequency domain resource group. Each of the above N frequency domain resource groups has a corresponding sequence, and the N sequences mapped to the N frequency domain resource groups include a first reference signal sequence and at least one second reference signal sequence. There are multiple ways to generate the first reference signal sequence and the second reference signal sequence. In one example, the sequences can be stored in memory. For example, the first reference signal sequence and/or the second reference signal sequence, or N sequences are generated in advance, these sequences are stored in the memory, and when the reference signal needs to be generated, these sequences are directly called or read from the memory, by These sequences are respectively mapped to frequency domain resource groups to generate frequency domain reference signals. In another example, the first reference signal sequence and the second reference signal sequence may be generated in real time according to the above method for generating a reference signal sequence according to parameters based on sequence correlation when needed. In yet another example, portions of the sequence may be kept in memory while other sequences are generated in real-time as needed. For example, the first reference signal sequence may be generated in advance and stored in the memory, and the second reference signal sequence may be generated in real time as required. This application does not limit this.

In the embodiment of the present application, since the second reference signal sequence is a linearly phase-rotated sequence of the first reference signal sequence, the first reference signal sequence and the second reference signal sequence are mutually orthogonal. By using at least two mutually orthogonal constant-amplitude sequences as reference signal sequences and mapping them to corresponding frequency-domain resource groups, the generated reference signals have low PAPR/RCM characteristics, thereby improving data transmission performance.

As shown in FIG. 4 , the M minimum time-frequency resource units in a frequency-domain resource group can be continuous or comb-shaped. The M minimum time-frequency resource units in a frequency domain resource group in Figure 4(a) are continuous; the M minimum time-frequency resource units in a frequency domain resource group in Figure 4(b) are regular combs ; The M minimum time-frequency resource units in a frequency-domain resource group in FIG. 4(c) are irregularly combed.

As shown in FIG. 5, the above N frequency domain resource groups may be continuous or discontinuous. In Figure 5(a), the N frequency domain resource groups are continuous in the frequency domain; in Figure 5(b), the N frequency domain resource groups are discontinuous in the frequency domain, and the intervals are equal; in Figure 5(c) The N frequency domain resource groups are discontinuous in the frequency domain, and the intervals are irregular.

The above is described by taking the same length of each frequency domain resource group in the N frequency domain resource groups as an example. It can be understood that the length of each frequency domain resource group in the above N frequency domain resource groups may also be different or partially Similarly, this application does not limit it.

A possible design of sequences mapped to N resource groups is further described below.

Sequence Design 1: The sequence mapped to the n+1th frequency domain resource group is a sequence after linear phase rotation of the sequence mapped to the nth frequency domain resource group, wherein the nth frequency domain resource group The domain resource group and the n+1th frequency domain resource group are two frequency domain resource groups in the N frequency domain resource groups with the same length.

Specifically, the sequence mapped on the n+1th frequency domain resource group is R(n+1,m), the sequence mapped on the nth frequency domain resource group is R(n,m), and the sequence R( n+1,m) is obtained by performing linear phase rotation on the sequence R(n,m), where n is an integer, and 0≤n≤N-2, and the phase of the linear phase rotation is α.

The value of phase α can be selected as a fixed value. For example, when α=π, the phases of the linear phase rotation of the sequence mapped to resource group 0 to resource group 5 relative to the sequence mapped to resource group 0 are respectively is {0, π, 0, π, 0, π}; when α=π/2, the sequence mapped to resource group 0 to resource group 5 is relative to the linear phase rotation of the sequence mapped to resource group 0 The phases are {0, π/2, π, 3π/2, 0, π/2}; when α=0, the sequence mapped to resource group 0 to resource group 5 is relative to the sequence mapped to resource group 0 The phases of the linear phase rotations of the sequences are {0, 0, 0, 0, 0, 0}, respectively.

The value of the phase α may also be associated with the number N of frequency domain resource groups, for example, when N is an even number, α=(2d+1)·π; when N is an odd number, α=2d·π, where , d is an integer.

Assuming that the sequence mapped to resource group 0 is R _u (m), the sequence mapped to N resource groups can be expressed by formula (5):

The beneficial effects of the embodiments of the present application in a specific scenario are given below. The assumed scenario is: the size of each frequency domain resource group is 4 RBs, that is, 48 subcarriers; M=48, R _u (m) is a sequence obtained by cyclic expansion of a ZC sequence with a length _of 47 and a root of 10; (m) Generate a sequence with a length of 6 frequency domain resource groups for the basic sequence Then the beneficial effects of the embodiments of the present application in this scenario are shown in Table 1. Example 1 in Table 1 is to map R _u (m) to each frequency domain resource group to generate a sequence Example 2 is a sequence generated according to formula (5). It can be seen from Table 1 that the reference signal sequence generated by using the formula (5) of the embodiment of the present application can significantly reduce the PAPR/RCM of the reference signal sequence.

Table 1

PAPR(dB) RCM(dB) example 1 13.07 16.83 Example 2 9.63 11.75

Considering that as shown in Figure 7 and Figure 8, phase rotation is performed on the N sequences mapped to N resource groups respectively, then the phase-rotated sequences mapped to N resource groups can be expressed by formula (6):

The beneficial effects of the embodiments of the present application in another specific scenario are given below. The assumed scenario is: the size of each frequency domain resource group is 4 RBs, that is, 48 subcarriers; M=48, R _u (m) is a sequence obtained by cyclic expansion of a ZC sequence with a length _of 47 and a root of 10; (m) Generate a sequence with a length of 6 frequency domain resource groups for the basic sequence The phase rotation vector of length 6 is Then the beneficial effects of the embodiments of the present application in this scenario are shown in Table 2. Example 3 in Table 2 is to map R _u (m) to each frequency domain resource group to generate a sequence Perform phase rotation on each frequency domain resource group at the same time; Example 4 is a sequence generated according to formula (6), and perform phase rotation on each frequency domain resource group at the same time. It can be seen from Table 2 that the reference signal sequence generated by the formula (6) of the embodiment of the present application can further reduce the PAPR/RCM of the reference signal sequence in the scenario of performing phase rotation on each frequency domain resource group .

Table 2

PAPR(dB) RCM(dB) Example 3 8.08 6.61 Example 4 7.07 5.46

Considering the overall linear phase rotation of the sequence mapped to N resource groups, the sequence mapped to N resource groups after linear phase rotation can be expressed by formula (7) and formula (8):

Sequence design two:

The reference signal sequence mapped in the qth frequency domain resource group in the pth resource group cluster of the N frequency domain resource groups is defined as R(p K+q, m), where p and q is an integer greater than or equal to zero, K is an integer greater than 1, m is the serial number of the element of the reference signal sequence, m is an integer and 0≤m≤M-1, M is the length of the reference signal sequence, p·K+q<N , q is the serial number of the frequency domain resource group in the resource group cluster and 0≤q≤K-1;

The reference signal sequence R(p K+q,m) mapped to each frequency domain resource group in the pth resource group cluster and the reference signal sequence mapped to each frequency domain resource group in the 0th resource group cluster The sequence R(q,m) is the same, where p is greater than zero;

For the 0th resource group cluster, the reference signal sequence R(q,m) mapped to the qth frequency domain resource group is the phase of the reference signal sequence R(0,m) mapped to the 0th frequency domain resource group rotated sequence, Among them, j is the imaginary number unit, q≥1, and α _q is the reference signal sequence mapped to the qth frequency domain resource group in the 0th resource group cluster relative to the reference signal sequence mapped to the 0th resource group cluster in the 0th resource group cluster The phase of the linear phase rotation of the reference signal sequence on frequency domain resource groups, α _q is a real number.

Taking N=12, K=3 as an example, the values of p and q are shown in Table 3, and the values of the phase {α ₁ ,α ₂ } may be or Wait.

table 3

resource group number n p q 0 0 0 1 0 1 2 0 2 3 1 0 4 1 1 5 1 2 6 2 0 7 2 1 8 2 2 9 3 0 10 3 1 11 3 2

Beneficial effects of the foregoing embodiments in a specific scenario are given below. The assumed scenario is: the size of each frequency domain resource group is 4 RBs, that is, 48 subcarriers; M=48, R _u (m) is a sequence obtained by cyclic expansion of a ZC sequence with a length _of 47 and a root of 10; (m) Generate a sequence with a length of 3 frequency domain resource groups for the basic sequence The value of phase {α ₁ ,α ₂ } is The beneficial effects of the above-mentioned embodiments are shown in Table 4, and Example 5 in Table 4 is to map R _u (m) to each frequency domain resource group to generate a sequence Example 6 is the sequence generated according to the above-mentioned embodiment. It can be seen from Table 4 that the reference signal sequence generated by the above embodiment can significantly reduce the PAPR/RCM of the reference signal sequence.

Table 4

PAPR(dB) RCM(dB) Example 5 10.07 11.0 Example 6 5.05 4.51

Beneficial effects of the foregoing embodiments in another specific scenario are given below. The assumed scenario is: the size of each frequency domain resource group is 4 RBs, that is, 48 subcarriers; M=48, R _u (m) is a sequence obtained by cyclic expansion of a ZC sequence with a length _of 47 and a root of 10; (m) Generate a sequence with a length of 3 frequency domain resource groups for the basic sequence The value of phase {α ₁ ,α ₂ } is A phase rotation vector of length 3 is {-1,1,1}. The beneficial effects of the above-mentioned embodiments are shown in Table 5, and Example 7 in Table 5 is to map R _u (m) to each frequency domain resource group to generate a sequence Example 8 is the sequence generated according to the above embodiment, and the phase rotation is performed on each frequency domain resource group at the same time. It can be seen from Table 5 that the reference signal sequence generated by the above embodiment can further reduce the PAPR/RCM of the reference signal sequence in the scenario where each frequency domain resource group performs phase rotation.

table 5

PAPR(dB) RCM(dB) Example 7 7.54 6.05 Example 8 5.09 4.47

When K=2 and N is an even number, refer to the sequence design in sequence design 1, phase α ₁ =(2·d+1)·π, and d is an integer.

Sequence Design 3: When the number N of frequency-domain resource groups is equal to 2, the second reference signal sequence is the sequence after the linear phase rotation of the first reference signal sequence, and the phase of the linear phase rotation is (2d+1) π, d is an integer. The sequence mapped on the frequency domain resource group 0 is the first reference signal sequence, and the sequence mapped on the frequency domain resource group 1 is the second reference signal sequence after the linear phase rotation of the first reference signal sequence by (2d+1)·π.

Beneficial effects of the foregoing embodiments in a specific scenario are given below. The assumed scenario is: the size of each frequency domain resource group is 4 RBs, that is, 48 subcarriers, M=48; R _u (m) is a sequence obtained by cyclic expansion of a ZC sequence _with a length of 47 and a root of 10; (m) Generate a sequence with a length of 2 frequency domain resource groups for the base sequence The beneficial effects of the above-mentioned embodiments are shown in Table 6, and Example 9 in Table 6 is to map R _u (m) to each frequency domain resource group to generate a sequence Example 10 is the sequence generated according to the above-mentioned embodiment. It can be seen from Table 6 that the reference signal sequence generated by the above embodiment can significantly reduce the PAPR/RCM of the reference signal sequence.

Table 6

PAPR(dB) RCM(dB) Example 9 8.33 7.79 Example 10 5.05 4.51

Beneficial effects of the foregoing embodiments in another specific scenario are given below. The assumed scenario is: the size of each frequency domain resource group is 4 RBs, that is, 48 subcarriers, M=48; R _u (m) is a sequence obtained by cyclic expansion of a ZC sequence _with a length of 47 and a root of 10; (m) Generate a sequence with a length of 2 frequency domain resource groups for the base sequence The phase rotation vector of length 2 is {1,-1}. The beneficial effects of the above-mentioned embodiments are shown in Table 7, and Example 11 in Table 7 is to map R _u (m) to each frequency domain resource group to generate a sequence Example 12 is the sequence generated according to the above embodiment, and the phase rotation is performed on each frequency domain resource group at the same time. It can be seen from Table 7 that the reference signal sequence generated by the above embodiment can further reduce the PAPR/RCM of the reference signal sequence in the scenario where each frequency domain resource group performs phase rotation.

Table 7

PAPR(dB) RCM(dB) Example 11 7.73 7.78 Example 12 5.09 4.47

As shown in FIG. 9 , the embodiment of the present application provides a method for transmitting a reference signal.

S910. The sending device transforms the reference signal in the frequency domain into the time domain to generate a reference signal in the time domain, where the reference signal in the frequency domain includes the first reference signal sequence and the At least one second reference signal sequence, the first reference signal sequence is a frequency-domain constant-amplitude sequence, the second reference signal sequence is a linear phase-rotated sequence of the first reference signal sequence, and N is an integer greater than 1. For the process of generating the reference signal in the frequency domain, reference may be made to the process shown in FIG. 2 .

As shown in FIG. 6 , after N sequences are mapped to N frequency domain resource groups, conversion from the frequency domain to the time domain is performed to obtain reference signals in the time domain. Commonly used transform methods from the frequency domain to the time domain are inverse discrete Fourier transform (inverse discreteFourier transform, IDFT) and fast Fourier transform (inverse fast Fourier transform, IFFT), but the embodiments of the present application do not limit this .

Optionally, as shown in FIG. 7 , the sending device multiplies N sequences by N complex coefficients respectively. This process is also called phase rotation, and then maps the N sequences multiplied by complex coefficients to N frequency In the domain resource group, a reference signal in the frequency domain is obtained, wherein the amplitudes of the N complex coefficients are all 1; then, the sending device transforms the reference signal in the frequency domain into a time domain to generate a reference signal in the time domain. Complex coefficients in Figure 7 β _n is a real number, and when n takes different values, the values of β _n can be the same or different.

Optionally, before transforming the reference signal in the frequency domain into a reference signal in the time domain, the sending device may also perform one or more linear phase rotations on the reference signal in the frequency domain, which is equivalent to performing one or more linear phase rotations on the reference signal in the frequency domain. or multiple time-domain cyclic shifts.

Optionally, as shown in FIG. 8, the sending device may also perform phase rotation on the N sequences in the frequency domain reference signal respectively, that is, respectively multiply N complex coefficients to obtain the second frequency domain reference signal; then, send The device transforms the second frequency-domain reference signal into the time domain to generate a time-domain reference signal.

Optionally, before transforming the second frequency-domain reference signal into a time-domain reference signal, the sending device may also perform a linear phase rotation on the entire second frequency-domain reference signal, which is equivalent to performing a linear phase rotation on the second frequency-domain reference signal A circular shift in the time domain was performed.

S920. The sending device sends the reference signal in the time domain.

It can be understood that, before sending the reference signal in the time domain, the sending device may also undergo digital-to-analog conversion (converting the digital signal into an analog signal) and carrier modulation (modulating the baseband signal onto a radio frequency carrier), and then pass The antenna transmits the signal.

As shown in FIG. 10 , the embodiment of the present application provides another method for transmitting a reference signal.

S1010. The receiving device receives a time domain reference signal.

It can be understood that the receiving device receives a wireless signal from a wireless channel through an antenna, where the wireless signal includes the reference signal in the time domain.

S1020. The receiving device transforms the reference signal in the time domain into the frequency domain to generate a reference signal in the frequency domain, where the reference signal in the frequency domain includes the first reference signal sequence and At least one second reference signal sequence, the first reference signal sequence is a frequency-domain constant-amplitude sequence, the second reference signal sequence is a linear phase-rotated sequence of the first reference signal sequence, and N is an integer greater than 1.

The receiving device measures the first reference signal sequence and the second reference signal sequence to obtain an estimate of a wireless channel parameter between the sending device and the receiving device, and the channel estimation result can be used to demodulate data sent by the sending device; Or obtain the measurement of the channel quality between the sending device and the receiving device, and the channel quality measurement result can be used for link adaptation and resource allocation of data transmission between the sending device and the receiving device. The measurement result of the sequence can also be used for positioning measurement, and this application does not limit the use of the reference signal.

In order for the receiving device to measure the received frequency domain reference signal, the receiving device can refer to the generation process of the frequency domain reference signal shown in Figure 2 to generate a frequency domain reference signal that is the same as the frequency domain reference signal generated by the sending device. reference signal.

In practical application, the method for the sending device to obtain the reference signal sequence may be to obtain the generated reference signal sequence from the memory, or to generate the reference signal sequence in real time according to the relevant parameters of the reference signal sequence.

The method for the sending device to obtain the relevant parameters of the reference signal sequence may be obtained from the memory, or the reference signal sequence may be uniformly allocated by the network device, and then send the relevant parameters of the reference signal sequence to the sending device through signaling, and the sending device uses the Relevant parameters of the reference signal sequence are used to acquire the reference signal sequence. Here, the relevant parameters of the ZC sequence may include at least one of the value indicating the length of the ZC sequence, the value of the root of the ZC sequence, and the value of the phase of the linear phase rotation. The network device here may be a base station NodeB, an evolved base station eNodeB, a base station in a 5G communication system, or other network devices.

In order to complete the measurement of the reference signal, the receiving device also needs to acquire the reference signal sequence used by the received reference signal. A method for the receiving device to obtain the reference signal sequence may be to first obtain a relevant parameter of the reference signal sequence, and then use the parameter to generate the reference signal sequence. The method for the receiving device to obtain the relevant parameters of the reference signal sequence: after the transmitting device obtains the relevant parameters of the reference signal sequence, it sends the relevant parameters of the reference signal sequence to the receiving device through signaling; or the network device sends the relevant parameters of the reference signal sequence to the receiving device through signaling. The relevant parameters of the reference signal sequence are sent to the receiving device.

The sending device and the receiving device can also obtain the relevant parameters of the reference signal sequence in an implicit manner, for example, implicitly determine the relevant parameters of the reference signal sequence by means of a cell identifier, a time slot number, and the like.

In the above-mentioned embodiments provided by the present application, various schemes such as the reference signal sequence generation method and the reference signal transmission method provided by the embodiments of the present application are introduced from the perspectives of the sending device, the receiving device, and the interaction between the sending device and the receiving device. It can be understood that, in order to realize the above-mentioned functions, each device, such as a sending device and a receiving device, includes a corresponding hardware structure and/or software module for performing each function. Those skilled in the art should easily realize that the present application can be implemented in the form of hardware or a combination of hardware and computer software in combination with the units and method steps described in the embodiments disclosed herein. Whether a certain function is executed by hardware or computer software drives hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

FIG. 11 and FIG. 12 are schematic structural diagrams of two possible communication devices provided by the embodiments of the present application. The communication device realizes the function of the sending device in the embodiment of the above-mentioned reference signal transmission method, and therefore can also realize the beneficial effects of the above-mentioned reference signal transmission method. In the embodiment of the present application, the communication device may be UE130 or UE140 or base station 120 as shown in FIG. 1 , or may be other sending-side devices that use reference signals for wireless communication.

As shown in FIG. 11 , a communication device 1100 includes a processing unit 1110 and a sending unit 1120 .

The processing unit 1110 is configured to transform the reference signal in the frequency domain into the time domain to generate the reference signal in the time domain, where the reference signal in the frequency domain includes first reference signals mapped to N frequency domain resource groups of the same length. A signal sequence and at least one second reference signal sequence, the first reference signal sequence is a frequency domain constant amplitude sequence, the second reference signal sequence is a sequence after linear phase rotation of the first reference signal sequence, and N is greater than Integer of 1.

The sending unit 1120 is configured to send the time domain reference signal.

Further, before the processing unit 1110 transforms the reference signal in the frequency domain into the time domain to generate the reference signal in the time domain, the processing unit is further configured to multiply the N sequences by N complex coefficients respectively, Then map the N sequences multiplied by the complex coefficients to the N frequency domain resource groups respectively to obtain the reference signal in the frequency domain, wherein the amplitudes of the N complex coefficients are all 1.

As shown in FIG. 12 , the communication device 1200 includes a processor 1210 , a transceiver 1220 and a memory 1230 , where the memory 1230 can be used to store codes executed by the processor 1210 . Various components in the communication device 1200 communicate with each other through internal connection paths, such as transmitting control and/or data signals through a bus.

Processor 1210, configured to transform the reference signal in the frequency domain into the time domain to generate the reference signal in the time domain, where the reference signal in the frequency domain includes first reference signals that are respectively mapped to N frequency domain resource groups of the same length A signal sequence and at least one second reference signal sequence, the first reference signal sequence is a frequency domain constant amplitude sequence, the second reference signal sequence is a sequence after linear phase rotation of the first reference signal sequence, and N is greater than Integer of 1.

The transceiver 1220 is configured to send the time domain reference signal.

Further, before the processor 1210 transforms the reference signal in the frequency domain into the time domain to generate the reference signal in the time domain, the processing unit is further configured to multiply the N sequences by N complex coefficients respectively, Then map the N sequences multiplied by the complex coefficients to the N frequency domain resource groups respectively to obtain the reference signal in the frequency domain, wherein the amplitudes of the N complex coefficients are all 1.

More detailed functional descriptions about the above-mentioned processing unit 1110, processor 1210, sending unit 1120, and transceiver 1220 can be directly obtained by referring to the above-mentioned method embodiments, and details are not repeated here.

FIG. 13 and FIG. 14 are structural schematic diagrams of two other possible communication devices according to the embodiments of the present application. The communication device realizes the function of the receiving device in the embodiment of the above-mentioned reference signal transmission method, and therefore can also realize the beneficial effects of the above-mentioned reference signal transmission method. In the embodiment of the present application, the communication device may be UE130 or UE140 or base station 120 as shown in FIG. 1 , or other receiving-side equipment that uses reference signals for wireless communication.

As shown in FIG. 13 , a communication device 1300 includes a receiving unit 1310 and a processing unit 1320 .

The receiving unit 1310 is configured to receive a time domain reference signal.

The processing unit 1320 is configured to transform the reference signal in the time domain into the frequency domain to generate a reference signal in the frequency domain, where the reference signal in the frequency domain includes first reference signals that are respectively mapped to N frequency domain resource groups of the same length A signal sequence and at least one second reference signal sequence, the first reference signal sequence is a frequency domain constant amplitude sequence, the second reference signal sequence is a sequence after linear phase rotation of the first reference signal sequence, and N is greater than Integer of 1.

As shown in FIG. 14 , the communication device 1400 includes a processor 1420 , a transceiver 1410 and a memory 1430 , where the memory 1430 can be used to store codes executed by the processor 1420 . Various components in the communication device 1400 communicate with each other through internal connection paths, such as transmitting control and/or data signals through a bus.

The transceiver 1410 is configured to receive the time domain reference signal.

The processor 1420 is configured to transform the reference signal in the time domain into the frequency domain to generate a reference signal in the frequency domain, where the reference signal in the frequency domain includes first reference signals that are respectively mapped to N frequency domain resource groups of the same length A signal sequence and at least one second reference signal sequence, the first reference signal sequence is a frequency domain constant amplitude sequence, the second reference signal sequence is a sequence after linear phase rotation of the first reference signal sequence, and N is greater than Integer of 1.

It can be understood that Fig. 12 and Fig. 14 only show one design of the communication device. In practical applications, the communication device may include any number of receivers and processors, and all communication devices that can implement the embodiments of the present application are within the protection scope of the present application.

More detailed functional descriptions about the above-mentioned receiving unit 1310, transceiver 1410, processing unit 1320, and processor 1420 can be directly obtained by referring to the above-mentioned method embodiments, and details are not repeated here.

It can be understood that the processor in the embodiment of the present application may be a central processing unit (Central Processing Unit, CPU), and may also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application-specific integrated circuits (Application Specific Integrated Circuit, ASIC), Field Programmable Gate Array (Field Programmable Gate Array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor can be a microprocessor, or any conventional processor.

The method steps in the embodiments of the present application may be implemented by means of hardware, or may be implemented by means of a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory (Random Access Memory, RAM), flash memory, read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM) , PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electrically erasable programmable read-only memory (Electrically EPROM, EEPROM), register, hard disk, mobile hard disk, CD-ROM or well-known in the art any other form of storage medium. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be a component of the processor. The processor and storage medium can be located in the ASIC. Additionally, the ASIC can be located in either the sending device or the receiving device. Of course, the processor and the storage medium may also exist in the sending device or the receiving device as discrete components.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in or transmitted via a computer-readable storage medium. The computer instructions may be transmitted from one website site, computer, server, or data center to another website site by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) , computer, server or data center for transmission. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, a Solid State Disk (SSD)).

It can be understood that the various numbers involved in the embodiments of the present application are only for convenience of description, and are not used to limit the scope of the embodiments of the present application.

It can be understood that, in the embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the order of execution, and the order of execution of the processes should be determined by their functions and internal logic, and should not be used in the implementation of this application. The implementation of the examples constitutes no limitation.

The above is only the specific implementation of the embodiment of the application, and any changes or substitutions that can be easily imagined by any person familiar with the technical field within the technical scope of the disclosure of the application shall be covered in the implementation of the application. within the scope of protection of the example.

Claims (26)

1. a kind of reference signal transmission method, which is characterized in that the method includes：

The reference signal of frequency domain is transformed into the reference signal that time domain generates time domain, wherein the reference signal of the frequency domain includes It is respectively mapped to the first reference signal sequence in the identical frequency domain resource group of N number of length and at least one second reference signal sequence Row, first reference signal sequence are frequency domain constant amplitude sequence, and second reference signal sequence is first reference signal Sequence after sequences phase place, N are the integer more than 1；

Send the time domain reference signal.

2. according to the method described in claim 1, it is characterized in that, the reference signal of the frequency domain is N number of including being respectively mapped to The first reference signal sequence in the identical frequency domain resource group of length and at least one second reference signal sequence, including：

The sequence being mapped in (n+1)th frequency domain resource group is the sequence line being mapped in n-th of frequency domain resource group Property phase place after sequence, wherein n-th of frequency domain resource group and (n+1)th frequency domain resource group are N number of length Spend two frequency domain resource groups in identical frequency domain resource group.

3. method according to claim 1 or 2, which is characterized in that the value of the phase of linear phase rotation and the frequency The number N of domain resource group is associated.

4. according to the method described in claims 1 to 3 any one, which is characterized in that when the number N of the frequency domain resource group is When even number, the phase of linear phase rotation is α=(2d+1) π, wherein d is integer.

5. method according to any one of claims 1 to 4, which is characterized in that when the number N of the frequency domain resource group is When odd number, the phase of linear phase rotation is α=2d π, wherein d is integer.

6. according to the method described in claim 1, it is characterized in that, the reference signal of the frequency domain is N number of including being respectively mapped to The first reference signal sequence in the identical frequency domain resource group of length and at least one second reference signal sequence, including：

The reference signal sequence being mapped in q-th of frequency domain resource group in p-th of resource group cluster in N number of frequency domain resource group Row are defined as R (pK+q, m), wherein p and q is the integer more than or equal to zero, and K is the integer more than 1, and m is reference signal sequence The serial number of the element of row, m are integer and the length that 0≤m≤M-1, M are reference signal sequence, and pK+q ＜ N, q are resource group cluster The serial number and 0≤q≤K-1 of interior frequency domain resource group；

The reference signal sequence R (pK+q, m) in each frequency domain resource group being mapped in p-th of resource group cluster be mapped to The reference signal sequence R (q, m) in each frequency domain resource group in 0th resource group cluster is identical, and wherein p is more than zero；

For the 0th resource group cluster, the reference signal sequence R (q, m) being mapped in q-th of frequency domain resource group is to be mapped to the 0th The sequence after reference signal sequence R (0, m) phase place in a frequency domain resource group,Wherein, j For imaginary unit, q >=1, α_qTo be mapped to the reference signal sequence phase in q-th of frequency domain resource group in the 0th resource group cluster The phase that linear phase for being mapped to the reference signal sequence in the 0th frequency domain resource group in the 0th resource group cluster rotates Position, α_qFor real number.

7. method according to any one of claims 1 to 6, which is characterized in that described to transform to the reference signal of frequency domain Time domain generates the reference signal of time domain, including：

N number of sequence is multiplied by N number of complex coefficient respectively, then maps the N number of sequence being multiplied by after complex coefficient respectively Onto N number of frequency domain resource group, the reference signal of the frequency domain is obtained, wherein the amplitude of N number of complex coefficient is 1；

The reference signal of the frequency domain is transformed into the reference signal that time domain generates the time domain.

8. a kind of communication device, which is characterized in that including：

Processing unit, for the reference signal of frequency domain to be transformed to the reference signal that time domain generates time domain, wherein the frequency domain Reference signal includes the first reference signal sequence being respectively mapped in the identical frequency domain resource group of N number of length and at least one Two reference signal sequences, first reference signal sequence are frequency domain constant amplitude sequence, and second reference signal sequence is described The first postrotational sequence of reference signal sequence linear phase, N are the integer more than 1；

Transmission unit, the reference signal for sending the time domain.

9. communication device according to claim 8, which is characterized in that the reference signal of the frequency domain includes being respectively mapped to The first reference signal sequence in the identical frequency domain resource group of N number of length and at least one second reference signal sequence, including：

The sequence being mapped in (n+1)th frequency domain resource group is the sequence line being mapped in n-th of frequency domain resource group Property phase place after sequence, wherein n-th of frequency domain resource group and (n+1)th frequency domain resource group are N number of length Spend two frequency domain resource groups in identical frequency domain resource group.

10. communication device according to claim 8 or claim 9, which is characterized in that the value of the phase of linear phase rotation and institute The number N for stating frequency domain resource group is associated.

11. according to claim 8 to 10 any one of them communication device, which is characterized in that as of the frequency domain resource group When number N is even number, the phase of linear phase rotation is α=(2d+1) π, wherein d is integer.

12. according to claim 8 to 11 any one of them communication device, which is characterized in that as of the frequency domain resource group When number N is odd number, the phase of linear phase rotation is α=2d π, wherein d is integer.

13. communication device according to claim 8, which is characterized in that the reference signal of the frequency domain includes mapping respectively The first reference signal sequence on to the identical frequency domain resource group of N number of length and at least one second reference signal sequence, including：

The reference signal sequence being mapped in q-th of frequency domain resource group in p-th of resource group cluster in N number of frequency domain resource group Row are defined as R (pK+q, m), wherein p and q is the integer more than or equal to zero, and K is the integer more than 1, and m is reference signal sequence The serial number of the element of row, m are integer and the length that 0≤m≤M-1, M are reference signal sequence, and pK+q ＜ N, q are resource group cluster The serial number and 0≤q≤K-1 of interior frequency domain resource group；

The reference signal sequence R (pK+q, m) in each frequency domain resource group being mapped in p-th of resource group cluster be mapped to The reference signal sequence R (q, m) in each frequency domain resource group in 0th resource group cluster is identical, and wherein p is more than zero；

For the 0th resource group cluster, the reference signal sequence R (q, m) being mapped in q-th of frequency domain resource group is to be mapped to the 0th The sequence after reference signal sequence R (0, m) phase place in a frequency domain resource group,Wherein, j For imaginary unit, q >=1, α_qTo be mapped to the reference signal sequence phase in q-th of frequency domain resource group in the 0th resource group cluster The phase that linear phase for being mapped to the reference signal sequence in the 0th frequency domain resource group in the 0th resource group cluster rotates Position, α_qFor real number.

14. according to claim 8 to 13 any one of them communication device, which is characterized in that the processing unit is by the frequency Before the reference signal in domain transforms to the reference signal that time domain generates the time domain, the processing unit is additionally operable to will be described N number of Sequence is multiplied by N number of complex coefficient respectively, and the N number of sequence being multiplied by after complex coefficient is then respectively mapped to N number of frequency domain In resource group, the reference signal of the frequency domain is obtained, wherein the amplitude of N number of complex coefficient is 1.

15. a kind of reference signal transmission method, which is characterized in that the method includes：

Receive the reference signal of time domain；

The reference signal of time domain is transformed into the reference signal that frequency domain generates frequency domain, wherein the reference signal of the frequency domain includes It is respectively mapped to the first reference signal sequence in the identical frequency domain resource group of N number of length and at least one second reference signal sequence Row, first reference signal sequence are frequency domain constant amplitude sequence, and second reference signal sequence is first reference signal Sequence after sequences phase place, N are the integer more than 1.

16. according to the method for claim 15, which is characterized in that the reference signal of the frequency domain includes being respectively mapped to N The first reference signal sequence in the identical frequency domain resource group of a length and at least one second reference signal sequence, including：

The sequence being mapped in (n+1)th frequency domain resource group is the sequence line being mapped in n-th of frequency domain resource group Property phase place after sequence, wherein n-th of frequency domain resource group and (n+1)th frequency domain resource group are N number of length Spend two frequency domain resource groups in identical frequency domain resource group.

17. method according to claim 15 or 16, which is characterized in that linear phase rotation phase value with it is described The number N of frequency domain resource group is associated.

18. according to the method described in claim 15 to 17 any one, which is characterized in that when the number of the frequency domain resource group When N is even number, the phase of linear phase rotation is α=(2d+1) π, wherein d is integer.

19. according to the method described in claim 15 to 18 any one, which is characterized in that when the number of the frequency domain resource group When N is odd number, the phase of linear phase rotation is α=2d π, wherein d is integer.

20. according to the method for claim 15, which is characterized in that the reference signal of the frequency domain includes being respectively mapped to N The first reference signal sequence in the identical frequency domain resource group of a length and at least one second reference signal sequence, including：

The reference signal sequence being mapped in q-th of frequency domain resource group in p-th of resource group cluster in N number of frequency domain resource group Row are defined as R (pK+q, m), wherein p and q is the integer more than or equal to zero, and K is the integer more than 1, and m is reference signal sequence The serial number of the element of row, m are integer and the length that 0≤m≤M-1, M are reference signal sequence, and pK+q ＜ N, q are resource group cluster The serial number and 0≤q≤K-1 of interior frequency domain resource group；

The reference signal sequence R (pK+q, m) in each frequency domain resource group being mapped in p-th of resource group cluster be mapped to The reference signal sequence R (q, m) in each frequency domain resource group in 0th resource group cluster is identical, and wherein p is more than zero；

For the 0th resource group cluster, the reference signal sequence R (q, m) being mapped in q-th of frequency domain resource group is to be mapped to the 0th The sequence after reference signal sequence R (0, m) phase place in a frequency domain resource group,Wherein, j For imaginary unit, q >=1, α_qTo be mapped to the reference signal sequence phase in q-th of frequency domain resource group in the 0th resource group cluster The phase that linear phase for being mapped to the reference signal sequence in the 0th frequency domain resource group in the 0th resource group cluster rotates Position, α_qFor real number.

21. a kind of communication device, which is characterized in that including：

Receiving unit, the reference signal for receiving time domain；

Processing unit, for the reference signal of time domain to be transformed to the reference signal that frequency domain generates frequency domain, wherein the frequency domain Reference signal includes the first reference signal sequence being respectively mapped in the identical frequency domain resource group of N number of length and at least one Two reference signal sequences, first reference signal sequence are frequency domain constant amplitude sequence, and second reference signal sequence is described The first postrotational sequence of reference signal sequence linear phase, N are the integer more than 1.

22. communication device according to claim 21, which is characterized in that the reference signal of the frequency domain includes mapping respectively The first reference signal sequence on to the identical frequency domain resource group of N number of length and at least one second reference signal sequence, including：

The sequence being mapped in (n+1)th frequency domain resource group is the sequence line being mapped in n-th of frequency domain resource group Property phase place after sequence, wherein n-th of frequency domain resource group and (n+1)th frequency domain resource group are N number of length Spend two frequency domain resource groups in identical frequency domain resource group.

23. the communication device according to claim 21 or 22, which is characterized in that linear phase rotation phase value with The number N of the frequency domain resource group is associated.

24. according to claim 21 to 23 any one of them communication device, which is characterized in that as of the frequency domain resource group When number N is even number, the phase of linear phase rotation is α=(2d+1) π, wherein d is integer.

25. according to claim 21 to 24 any one of them communication device, which is characterized in that as of the frequency domain resource group When number N is odd number, the phase of linear phase rotation is α=2d π, wherein d is integer.

26. communication device according to claim 21, which is characterized in that the reference signal of the frequency domain includes mapping respectively The first reference signal sequence on to the identical frequency domain resource group of N number of length and at least one second reference signal sequence, including：

The reference signal sequence being mapped in q-th of frequency domain resource group in p-th of resource group cluster in N number of frequency domain resource group Row are defined as R (pK+q, m), wherein p and q is the integer more than or equal to zero, and K is the integer more than 1, and m is reference signal sequence The serial number of the element of row, m are integer and the length that 0≤m≤M-1, M are reference signal sequence, and pK+q ＜ N, q are resource group cluster The serial number and 0≤q≤K-1 of interior frequency domain resource group；

The reference signal sequence R (pK+q, m) in each frequency domain resource group being mapped in p-th of resource group cluster be mapped to The reference signal sequence R (q, m) in each frequency domain resource group in 0th resource group cluster is identical, and wherein p is more than zero；

For the 0th resource group cluster, the reference signal sequence R (q, m) being mapped in q-th of frequency domain resource group is to be mapped to the 0th The sequence after reference signal sequence R (0, m) phase place in a frequency domain resource group,Wherein, j For imaginary unit, q >=1, α_qTo be mapped to the reference signal sequence phase in q-th of frequency domain resource group in the 0th resource group cluster The phase that linear phase for being mapped to the reference signal sequence in the 0th frequency domain resource group in the 0th resource group cluster rotates Position, α_qFor real number.