CN108200001B - Method and apparatus for multi-layer modulation of signal in communication system - Google Patents

Abstract

The invention discloses a method and a device for multi-layer modulation of signals in a communication system. First, according to the transmission requirements of the communication system, the transmission data is divided into multiple information streams with transmission requirements; The information flow determines the modulation mode of the signal; then sets the constellation map mapping for all modulated signals under each modulation mode; then, according to the constellation map mapping between the data to be transmitted and the modulated signal of the information flow, a modulated signal is generated for each information flow; then According to the transmission requirements of the multiple information streams and the channel state information, the modulated signals of the multiple information streams and the constellation map are combined to generate the multi-layer modulated signal and the constellation map of the communication system. The invention determines the matching modulation mode and constellation map mapping for multiple information streams, and then combines and processes the modulated signals according to the transmission requirements and channel states of the multiple information streams, so as to realize the high-efficiency conversion of data from bits to multi-layer modulation signals at the transmitting end. Modulation and mapping.

Description

Method and apparatus for multi-layer modulation of signal in communication system

technical field

The present invention relates to the technical field of communications, in particular to a method and device for multi-layer modulation of signals in a communications system.

Background technique

With the rapid development of mobile communication technology, resources such as space, time, frequency, and antenna that can carry signals have been fully tapped and utilized. Both wired and wireless communication networks are overloaded to carry the strong demand of human beings for information interaction. How to solve the continuous and rapid growth of communication business needs has become a thorny problem for today's global communication practitioners and institutions.

In order to solve this serious problem, researchers and institutions have begun to explore and mine underutilized spectrum resources, such as power domain and degraded channel gain, to improve the transmission capacity of existing communication networks. The technologies of non-orthogonal multiple access, power division multiplexing and orthogonal power division multiplexing multiple access are proposed. These technologies require the transmitting end to map the data into multiple modulated signals, and then directly superimpose the multiple modulated signals together for transmission; at the receiving end, use the serial interference cancellation technology to demodulate the superimposed multi-layer signals in sequence. The existing methods of constellation map mapping and directly superimposing multiple modulated signals do not well establish the mapping relationship between bit data and multi-layer superimposed signals, so that the demodulation at the receiving end faces a serious error accumulation problem, and the demodulation performance is poor. . Therefore, the transmission performance of such systems is severely restricted.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method and device for multi-layer modulation of signals in a communication system to overcome the above-mentioned defects in the prior art. The information flow determines the matching modulation mode and constellation map mapping, and then combines the modulated signals according to the transmission requirements of multiple information streams and the channel state, so as to realize the efficient mapping of the transmitter data from bits to the multi-layer modulated signals, and solve the problem of existing communication. In the system, due to the mismatch between the data and the multi-layer modulation signal, the serial interference cannot be effectively used to cancel the demodulation problem, which breaks through the bottleneck of low modulation performance in the existing communication system.

To achieve the above object, the present invention adopts the following technical solutions:

A method for multi-layer modulation of signals in a communication system, comprising the following steps:

Step 1: According to the transmission requirements of the communication system, the transmission data is divided into multiple information streams with transmission requirements;

Step 2: Determine the modulation mode of the signal for each information stream according to the transmission requirements of the multiple information streams;

Step 3: Set constellation map mapping for all modulated signals under each modulation mode;

Step 4: According to the constellation map mapping between the data to be transmitted and the modulated signal of the information stream, a modulated signal is generated for each information stream;

Step 5: according to the transmission requirements of the multiple information streams and the channel state information, the modulation signals of the multiple information streams and the constellation map are combined to generate the multi-layer modulation signal and the constellation map of the communication system;

The transmission requirements of the information flow include: service quality requirements of one or more services, or service quality requirements of one or more users.

Further, in step 2, the specific method for determining the modulation mode of the signal for each information flow is: according to the transmission requirement of each information flow, select the system and the keying mode of the digital keying signal;

Among them, the system includes: binary, quaternary, quinary, octal, 9, hexadecimal and hexadecimal; keying methods include: amplitude keying modulation, frequency shift keying modulation, phase shift Keying modulation, quadrature amplitude modulation and quadrature frequency division multiplexing modulation.

Further, the specific method for setting the constellation map mapping in step 3 is:

A bit symbol is set for each modulated signal on the constellation diagram corresponding to the modulation mode; among them, all symbols in the same modulation mode have the same code length and different code words, and all symbols in the same modulation mode have the same code length. The number is equal to the base number in the modulation mode; the bit symbol is a binary digital sequence;

Different bit symbols are allocated to all modulated signals under each modulation mode; and the allocated bit symbols must meet the conditions: under the same modulation mode, the code distance of the bit symbols allocated by any two modulated signals It is proportional to the spatial distance of the constellation points on the constellation diagram of the two modulated signals.

Further, in step 5, the modulated signals of the multiple information streams are combined, and the specific method for generating the multi-layer modulated signal of the communication system and the constellation map mapping is:

According to the transmission requirements of multiple information streams, the modulated signals from different information streams and the constellation points on the constellation diagram are adjusted in amplitude; Phase adjustment is performed on the constellation points; multiple modulation signals after amplitude and phase adjustment are superimposed to generate a multi-layer modulation signal of the system; multiple constellation diagrams after amplitude and phase adjustment are combined to generate the constellation diagram mapping of the system;

Among them, each constellation point on the combined system constellation diagram is composed of a group of constellation points from each information stream, and all represent a different multi-layer modulation signal; multiple bits of each group of constellation points The symbols are combined into bit symbols of the constellation points on the system constellation map to generate the system constellation map mapping.

Further, the described phase adjustment method is specifically as follows: the modulated signal from the same information flow is the same as the phase adjusted by the constellation points on the constellation diagram; after the phase adjustment, any adjacent two constellation points on the system constellation diagram Minimum yardage.

A device for multi-layer modulation of signals in a communication system, including a data shunt module, a modulation matching module is connected to the data shunt module, a constellation map mapping module is connected to the modulation matching module, a signal generation module is connected to the constellation map mapping module, and the signal generation module connected to the multi-layer aliasing module; where:

Data distribution module: According to the transmission requirements of the communication system, the transmission data is divided into multiple information streams with transmission requirements;

Modulation matching module: According to the transmission requirements of multiple information streams, determine the modulation mode of the signal for each information stream;

Constellation map mapping module: Set constellation map mapping for all modulated signals under each modulation mode;

Signal generation module: According to the constellation mapping between the data to be transmitted and the modulated signal of the information stream, the modulated signal is generated for each information stream;

Multi-layer aliasing module: According to the transmission requirements and channel state information of multiple information streams, the modulated signals and constellation maps of the multiple information streams are combined to generate the multi-layer modulation signals and constellation maps of the communication system.

Further, in the modulation matching module, the modulation mode of determining the signal for each information flow is specifically as follows: according to the transmission requirement of each information flow, the system and the keying mode of the digital keying signal are selected;

Among them, the system includes: binary, quaternary, quinary, octal, 9, hexadecimal and hexadecimal; keying methods include: amplitude keying modulation, frequency shift keying modulation, phase shift Keying modulation, quadrature amplitude modulation and quadrature frequency division multiplexing modulation.

Further, setting the constellation map mapping in the constellation map mapping module is specifically:

A bit symbol is set for each modulated signal on the constellation diagram corresponding to the modulation mode; among them, all symbols in the same modulation mode have the same code length and different code words, and all symbols in the same modulation mode have the same code length. The number is equal to the base number in the modulation mode; the bit symbol is a binary digital sequence;

Different bit symbols are allocated to all modulated signals under each modulation mode; and the allocated bit symbols must meet the conditions: under the same modulation mode, the code distance of the bit symbols allocated by any two modulated signals It is proportional to the spatial distance of the constellation points on the constellation diagram of the modulated signal.

Further, in the multi-layer aliasing module, the modulated signals of the multiple information streams are combined to generate the multi-layer modulated signal and constellation map mapping of the communication system as follows:

According to the transmission requirements of multiple information streams, the modulated signals from different information streams and the constellation points on the constellation diagram are adjusted in amplitude; Phase adjustment is performed on the constellation points; multiple modulation signals after amplitude and phase adjustment are superimposed to generate a multi-layer modulation signal of the system; multiple constellation diagrams after amplitude and phase adjustment are combined to generate the constellation diagram mapping of the system;

Among them, each constellation point on the combined system constellation diagram is composed of a group of constellation points from each information stream, and all represent a different multi-layer modulation signal; multiple bits of each group of constellation points The symbols are combined into bit symbols of the constellation points on the system constellation map to generate the system constellation map mapping.

Further, the phase adjustment in the multi-layer aliasing module is specifically: the modulated signal from the same information flow is the same as the phase adjusted by the constellation points on the constellation diagram; after the phase adjustment, any adjacent two constellations on the system constellation diagram are the same. The yardage distance of the point is the smallest.

Compared with the prior art, the present invention has the following beneficial technical effects:

The method of the invention divides the transmission data into multiple information streams with transmission requirements first, then determines the matching modulation mode and constellation map mapping for each information stream, and further modulates the modulation signal and the channel state according to the transmission requirements of the multiple information streams and the channel state. The constellation map is combined and processed, which realizes the efficient mapping of data from bits to multi-layer modulation signals at the transmitter while meeting the requirements of serial interference cancellation and demodulation, breaking through the bottleneck of low performance of multi-layer modulation signals in existing communication systems.

The device of the present invention divides the data of the transmitting end into multiple information streams with transmission requirements through the data splitting module, sets the matching modulation mode for the multiple information streams through the modulation matching module, and sets the modulation mode set by the modulation matching module through the constellation map mapping module. Determine the appropriate constellation map mapping, generate the modulated signal according to the constellation map map determined by the constellation map map module and the data in the information flow through the signal generation module, and combine the generated multiplexed modulated signal and the constellation map map through the multi-layer aliasing module It realizes the efficient generation of multi-layer modulated signals and the efficient mapping between transmitter data and multi-layer modulated signals, and breaks through the bottleneck of low demodulation performance of multi-layer modulated signals when meeting the requirements of serial interference cancellation and demodulation in existing communication systems.

Description of drawings

Fig. 1 is the flow chart of the signal multilayer modulation method in the communication system of the present invention;

Fig. 2 is the schematic diagram of the present invention to constellation map mapping and merging;

FIG. 3 is a structural diagram of a signal multi-layer modulation device in the communication system of the present invention.

Detailed ways

The embodiment of the present invention provides a method for multi-layer modulation of signals in a communication system. By dividing the transmission data of the transmitting end into multiple information streams with transmission requirements, and determining a matching modulation mode and constellation map mapping for each information stream, and then According to the transmission requirements of multiple information streams and the channel state, the modulation signal and the constellation map are combined and processed, so as to realize the efficient mapping of the data from the bit to the multi-layer modulation signal at the transmitting end, and solve the problem of data and multi-layer modulation signals in the existing communication system. The mapping mismatch leads to the problem of difficult demodulation and breaks through the bottleneck of low modulation performance in the existing communication system. In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments.

Referring to FIG. 1, it is a flowchart of a signal multi-layer modulation method in a communication system proposed by an embodiment of the present invention, which may include:

S101, according to the transmission requirements of the communication system, divide the transmission data into multiple information streams with transmission requirements;

Taking a simple system as an example below, the method for dividing the transmission data into multiple information streams with transmission requirements will be described in detail.

It is assumed that the transmission data of the system consists of two services to be served, denoted as N ₁ and N ₂ respectively; these two services have their own service quality requirements, denoted as C ₁ and C ₂ respectively.

According to the service composition of the transmission data, the embodiment of the present invention divides the transmission data into two information streams, denoted as X ₁ and X ₂ respectively, and sets the transmission requirements of the two information streams as C ₁ and C ₂ respectively.

Similarly, for the case of more than two services waiting to be serviced, there is also a method of splitting the information flow into multiple channels.

S102, according to the transmission requirements of the multiple information streams, determine the modulation mode of the signal for each information stream;

The specific method of determining the modulation mode of the signal for each information flow is: according to the transmission requirements of each information flow, select the system and the keying mode of the digital keying signal;

Among them, the system includes: binary, quaternary, quinary, octal, 9, hexadecimal and hexadecimal; keying methods include: amplitude keying modulation, frequency shift keying modulation, phase shift Keying modulation, quadrature amplitude modulation and quadrature frequency division multiplexing modulation.

The determination of the signal modulation mode is described in detail below by taking a simple system as an example.

It is assumed that the transmission data of the system consists of two services to be served, denoted as N ₁ and N ₂ respectively; these two services require a transmission rate of 2 bits per second and 1 bit per second respectively to meet the service quality requirements; Quality of service requirements, divide the transmission data into two information streams, denoted as X ₁ and X ₂ respectively, and set the transmission requirements of these two information streams to meet the transmission rates of 2 bits per second and 1 bit per second respectively.

According to the transmission requirements of the two information streams, the embodiment of the present invention selects quaternary frequency shift keying modulation for the information stream requiring a transmission rate of 2 bits per second, and selects binary frequency shift keying for the information stream requiring a transmission rate of 1 bit per second control modulation.

Similarly, for the case of more than two information streams, there are also methods for determining multiple modulation schemes.

S103, setting constellation map mapping for all modulated signals under each modulation mode;

The specific method of setting the constellation map mapping is: set a bit symbol for each modulation signal on the constellation map corresponding to the modulation mode; wherein, the code lengths of all symbols in the same modulation mode are the same, and the code words are different. And the number of all symbols in the same modulation mode is equal to the number in the modulation mode; the bit symbol is a binary digital sequence;

Different bit symbols are allocated to all modulated signals under each modulation mode; and the allocated bit symbols must meet the conditions: under the same modulation mode, the code distance of the bit symbols allocated by any two modulated signals It is proportional to the spatial distance of the constellation points on the constellation diagram of the modulated signal.

The following takes the simple system in S102 as an example to describe the constellation map mapping settings in detail.

Taking the two information streams and the two determined modulation modes in S102 as an example, the embodiment of the present invention sets the number of symbols to be 4 and the length of symbols to be ₄ according to the quaternary frequency shift keying modulation adopted by the information stream X1. 2, the four code words are "00", "01", "10" and "11"respectively; refer to Figure 2, according to the distribution of the constellation points on the constellation diagram of the four modulated signals in the quaternary frequency shift keying modulation , assign the codeword "00" to the constellation point in the first quadrant, assign the codeword "01" to the constellation point in the second quadrant, assign the codeword "11" to the constellation point in the third quadrant, and assign the codeword "11" to the constellation point in the fourth quadrant The constellation point allocation code word "10" of the quadrant;

According to the binary frequency shift keying modulation adopted by the information stream X ₂ in the embodiment of the present invention, the number of symbols is set to 2, the length of the symbol is 1, and the two code words are “0” and “1” respectively; referring to FIG. 2 , according to The distribution of the constellation points on the constellation diagram of the two modulated signals in the binary frequency shift keying modulation, the codewords "0" and "1" are respectively assigned to the two constellation points.

Similarly, for the case of more than two information streams, there is also a method of setting constellation map mapping for multiple modulation modes.

S104, according to the constellation map mapping between the data to be transmitted of the information stream and the modulated signal, generate a modulated signal for each information stream;

The following takes a simple system as an example to describe the method of generating a modulated signal for each information stream in detail.

Suppose there are two information flows in the system, denoted as X ₁ and X ₂ respectively; the data to be transmitted in the information flow X ₁ is "100111", and the data to be transmitted in the information flow X ₂ is "11001"; see Figure 2, the information flow The quaternary frequency shift keying modulation adopted by X ₁ , the constellation map is set to map to the first quadrant, the second quadrant, the bit symbols of the constellation points on the third quadrant and the fourth quadrant are "00", "01" respectively , "11" and "10"; the binary frequency shift keying modulation adopted by the information flow X ₂ , the bit symbols of the two constellation points on the abscissa are set to map the constellation diagram to be "0" and "1" respectively .

The embodiment of the present invention generates a modulation signal matching the fourth quadrant constellation point for the information stream X ₁ according to the data to be transmitted and the constellation map mapping of the _two information streams; matched modulation signal.

Similarly, for the case of more than two information streams, different constellation point mappings and different data to be transmitted, there are also methods for generating modulated signals for the information streams.

S105, according to the transmission requirements of the multiple information streams and the channel state information, combine the modulation signals of the multiple information streams and the constellation map mapping to generate the multi-layer modulation signal and the constellation map mapping of the communication system;

The specific method of generating the multi-layer modulated signal of the communication system is as follows: according to the transmission requirements of the multiple information streams, the amplitude of the modulated signals from different information streams and the constellation points on the constellation diagram is adjusted; according to the transmission requirements of the multiple information streams, Perform phase adjustment on modulated signals from different information streams and constellation points on the constellation diagram; superimpose multiple modulated signals after amplitude and phase adjustment to generate multi-layer modulated signals of the system; The constellation diagrams are merged to generate the constellation diagram mapping of the system;

Among them, each constellation point on the combined system constellation diagram is composed of a group of constellation points from each information stream, and all represent a different multi-layer modulation signal; multiple bits of each group of constellation points The symbols are combined into the bit symbols of the constellation points on the system constellation diagram to generate the constellation diagram mapping of the system; the phase adjustment makes the modulated signal from the same information stream and the constellation points on the constellation diagram adjust the same phase; after the phase adjustment, the system The code distance between any two adjacent constellation points on the constellation map is the smallest;

Taking a simple system as an example below, the method for generating a multi-layer modulated signal of a communication system by combining modulated signals of multiple information streams and constellation map mapping will be described in detail.

Suppose there are two information streams in the system, denoted as X ₁ and X ₂ respectively; the transmission requirements of these two information streams are to satisfy the transmission rates of 2 bits per second and ₁ bit per second respectively; Control frequency shift keying modulation, set the constellation map to map to the first quadrant, the second quadrant, the bit symbols of the constellation points on the third quadrant and the fourth quadrant are "00", "01", "11" and "10"; the binary frequency shift keying modulation adopted by the information flow X ₂ , the bit symbols of the two constellation points on the positive and negative abscissas are set to be "0" and "1"respectively; to be transmitted After the data is mapped by the constellation diagram, a modulated signal matching the fourth quadrant constellation point is generated for the information flow X1, and _a modulated signal matching the constellation point on the negative horizontal axis is generated for the information flow X2 _; the channel loss is 0.1, the noise power is n.

和

把信息流X₁和信息流X₂中的星座图按照振幅分别为

和

进行调整；把来自信息流X₁和信息流X₂的调制信号相位分别调整0度和+45度；把信息流X₁和信息流X₂星座图中星座点的相位进行调整；参见图2，对幅度调整和相位调整后的两个星座图进行合并，生成系统的星座图映射；把两个调制信号进行叠加，生成系统的多层调制信号，对应图2中多层调制信号星座图上比特码为“101”的星座点；参见图2，多层调制信号星座图上的比特码“101”为信息流X₁在第四象限星座点的码字“10”与信息流X₂在负横轴上星座点的码字“1”的直接组合；In the embodiment of the present invention, according to transmission requirements, channel loss information and noise power information, the transmit powers _of the modulated signals _of the information flow X1 and the information flow X2 are set to be _60n and 10n respectively _; The signal amplitudes are adjusted to

and

The constellation diagrams in the information flow X ₁ and the information flow X ₂ are respectively according to the amplitude as

and

Adjust; adjust the modulated signal phases from information flow X ₁ and information flow X ₂ by 0 degrees and +45 degrees respectively; adjust the phases of the constellation points in the constellation diagrams of information flow X ₁ and information flow X ₂ ; see Figure 2 , merge the two constellation diagrams after amplitude adjustment and phase adjustment to generate the constellation diagram mapping of the system; superimpose the two modulation signals to generate the multi-layer modulation signal of the system, which corresponds to the multi-layer modulation signal constellation diagram in Figure 2 The constellation point whose bit code is "101"; referring to Figure 2, the bit code "101" on the multi-layer modulation signal constellation diagram is the code word "10" of the information stream X ₁ in the fourth quadrant constellation point and the information stream X ₂ The direct combination of the codeword "1" of the constellation point on the negative horizontal axis;

The specific process of the phase adjustment is as follows: when the signal of the information stream X ₁ is the modulated signal corresponding to the bit symbol "00", the signal in the information stream X ₂ is rotated by -45 degrees; when the signal of the information stream X ₁ is The modulated signal corresponding to the bit symbol "01" rotates the signal in the information stream X ₂ by -135 degrees; when the signal of the information stream X ₁ is the modulated signal corresponding to the bit symbol "11", the signal in the information stream X ₂ is rotated by -135 degrees. The signal in the information stream X 1 is rotated by 135 degrees; when the signal in the information stream X ₁ is the modulated signal corresponding to the bit symbol "10", the signal in the information stream X ₂ is rotated by +45 degrees.

Similarly, for the case of more than two information streams, different constellation point mappings and different data to be transmitted, there are also methods for generating multi-layer modulation signals and constellation map mappings of the communication system.

The method for multi-layer modulation of signals in the above communication system, by first dividing the transmission data into multiple information streams with transmission requirements, and then determining the matching modulation mode and constellation map mapping for each information stream, according to the transmission requirements of the multiple information streams. The modulated signal and constellation map mapping are combined with the channel state, which realizes the efficient generation and mapping of data from bits to multi-layer modulated signals at the transmitting end, breaking the existing communication system when it meets the requirements of serial interference cancellation and demodulation. The bottleneck of low demodulation performance of layer modulated signal.

As shown in FIG. 3 , the structure diagram of the apparatus for multi-layer modulation of signals in the communication system according to the embodiment of the present invention includes:

Data distribution module: According to the transmission requirements of the communication system, the transmission data is divided into multiple information streams with transmission requirements;

Modulation matching module: According to the transmission requirements of multiple information streams, determine the modulation mode of the signal for each information stream;

Constellation map mapping module: Set constellation map mapping for all modulated signals under each modulation mode;

Signal generation module: According to the constellation mapping between the data to be transmitted and the modulated signal of the information stream, the modulated signal is generated for each information stream;

Multi-layer aliasing module: According to the transmission requirements and channel state information of multiple information streams, the modulated signals and constellation maps of the multiple information streams are combined to generate the multi-layer modulation signals and constellation maps of the communication system.

In the embodiment of the present invention, the data splitting module 301 divides the data of the transmitter into multiple information streams with transmission requirements, the modulation matching module 302 sets a matching modulation mode for the multiple information streams, and the constellation map mapping module 303 is the modulation matching module 302 The set modulation mode determines a suitable constellation map mapping, the signal generation module 304 generates a modulated signal according to the constellation map map determined by the constellation map mapping module and the data in the information flow, and the multi-layer aliasing module 305 generates the multiplexed modulated signal and the constellation. Graph mapping is combined and processed to achieve efficient generation of multi-layer modulation signals and efficient mapping of data to be transmitted and multi-layer modulation signals, breaking through the bottleneck of low performance of multi-layer modulation signals in existing communication systems.

Wherein, the modulation matching module determines the modulation mode of the signal for each channel of information flow specifically: according to the transmission requirements of each channel of information flow, select the system and keying mode of the digital keying signal; wherein, the system includes: binary, four Hexadecimal, quinary, octal, 9, hexadecimal and hexadecimal; keying methods include: Amplitude Keying Modulation, Frequency Shift Keying Modulation, Phase Shift Keying Modulation, Quadrature Amplitude Modulation and Orthogonal frequency division multiplexing modulation.

The setting of the constellation map mapping in the constellation map mapping module is specifically: setting a bit symbol for each modulation signal on the constellation map corresponding to the modulation mode; wherein, the code lengths of all symbols under the same modulation mode are equal, The code words are all different, and the number of all symbols in the same modulation mode is equal to the number in the modulation mode; the bit symbol is a binary digital sequence;

Different bit symbols are allocated to all modulated signals under each modulation mode; and the allocated bit symbols must meet the conditions: under the same modulation mode, the code distance of the bit symbols allocated by any two modulated signals It is proportional to the spatial distance of the constellation points on the constellation diagram of the modulated signal.

Among them, in the multi-layer aliasing module, the modulated signals of multiple information streams are combined to generate the multi-layer modulated signal of the communication system. Specifically, according to the transmission requirements of the multiple information streams, the modulated signals and constellations from different information streams According to the transmission requirements of multiple information streams, the modulated signals from different information streams and the constellation points on the constellation diagram are adjusted in phase; the multiple modulated signals after amplitude and phase adjustment are superimposed, Generate the multi-layer modulation signal of the system; combine the multiple constellation diagrams after amplitude and phase adjustment to generate the constellation diagram map of the system; each constellation point on the combined system constellation diagram is composed of a group from each information flow. The constellation points of the constellation points are superimposed, and all represent a different multi-layer modulation signal; the multiple bit symbols of each group of constellation points are combined into the bit symbols of the constellation points on the system constellation diagram, and the constellation diagram mapping of the system is generated; Among them, the phase adjustment in the multi-layer aliasing module will adjust the modulated signal from the same information stream and the constellation points on the constellation diagram to the same phase; after the phase adjustment, the codes of any two adjacent constellation points on the system constellation diagram Minimum distance.

The above-mentioned modules may be distributed in one device, or may be distributed in multiple devices. The above modules can be combined into one module, or can be further split into multiple sub-modules.

The device for multi-layer modulation of signals in the above communication system can be set up independently as a separate device, or can be integrated in the base station and the mobile terminal equipment.

The device for power distribution of the uplink and downlink in the above-mentioned multiple access system, the data splitting module 301 divides the data of the transmitting end into multiple information streams with transmission requirements, and the modulation matching module 302 sets a matching modulation mode for the multiple information streams, and a constellation diagram The mapping module 303 determines a suitable constellation map mapping for the modulation mode set by the modulation matching module 302, the signal generation module 304 generates a modulated signal according to the constellation map map determined by the constellation map mapping module and the data in the information flow, and the multi-layer aliasing module 305 generates a modulation signal. The generated multiplex modulated signal and constellation map are combined and processed to achieve efficient generation of multi-layer modulation signals and efficient mapping of data to be transmitted and multi-layer modulation signals, breaking through existing communication systems when meeting serial interference cancellation and demodulation requirements. The bottleneck of low demodulation performance of multi-layer modulated signal.

From the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by hardware, and can also be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, U disk, mobile hard disk, etc.) So that a computer device (which may be a personal computer, a server, a network device, etc.) executes the methods described in the various embodiments of the present invention.

Those skilled in the art can understand that the accompanying drawing is only a schematic diagram of a preferred embodiment, and the modules or processes in the accompanying drawing are not necessarily necessary to implement the present invention.

Those skilled in the art can understand that the modules in the apparatuses in the embodiments may be distributed in the apparatuses of the embodiments according to the description of the embodiments, and may also be located in one or more apparatuses different from the embodiments with corresponding changes. The modules in the foregoing embodiments may be combined into one module, or may be further split into multiple sub-modules.

Claims (6)

1. A method for multi-layer modulation of signals in a communication system, comprising the steps of:

step 1: dividing transmission data into a plurality of information streams with transmission requirements according to the transmission requirements of a communication system;

step 2: determining a modulation mode of a signal for each information stream according to the transmission requirement of multiple information streams, wherein the specific method for determining the modulation mode of the signal for each information stream is as follows: selecting the system and keying mode of the digital keying signal according to the transmission requirement of each path of information stream;

wherein, the system includes: binary, quaternary, quinary, octal, nonal, hexadecimal and heptanal; the keying manner comprises the following steps: amplitude keying modulation, frequency shift keying modulation, phase shift keying modulation, quadrature amplitude modulation, and orthogonal frequency division multiplexing modulation;

and step 3: setting constellation map for all modulation signals under each modulation mode, wherein the specific method for setting the constellation map comprises the following steps:

setting a bit code element for each modulation signal on a constellation diagram corresponding to the modulation mode; the code length of all code elements under the same modulation mode is equal, the code words are different, and the number of all code elements under the same modulation mode is equal to the binary number in the modulation mode; the bit code element is a binary digit sequence;

allocating different bit code elements for all modulation signals under each modulation mode; and the allocated bit code element needs to satisfy the condition: under the same modulation mode, the code distance of bit code elements distributed by any two modulation signals is in direct proportion to the space distance of constellation points of the two modulation signals on a constellation diagram;

and 4, step 4: generating a modulation signal for each channel of information stream according to the constellation mapping of the data to be transmitted of the information stream and the modulation signal;

and 5: combining the modulation signals and the constellation map mapping of the multi-channel information stream according to the transmission requirements and the channel state information of the multi-channel information stream to generate a multi-layer modulation signal and constellation map mapping of the communication system;

wherein, the transmission requirement of the information flow comprises: quality of service requirements of one or more services, or quality of service requirements of one or more users.

2. The method according to claim 1, wherein the step 5 of combining the modulated signals of the multiple information streams to generate the multi-layer modulated signals and the constellation mapping of the communication system comprises:

according to the transmission requirements of the multi-channel information streams, amplitude adjustment is carried out on modulation signals from different information streams and constellation points on a constellation diagram; according to the transmission requirements of the multi-channel information streams, carrying out phase adjustment on modulation signals from different information streams and constellation points on a constellation diagram; superposing the plurality of modulation signals after amplitude and phase adjustment to generate a multilayer modulation signal of the system; combining the plurality of constellation diagrams after the amplitude and phase adjustment to generate constellation diagram mapping of the system;

each constellation point on the combined system constellation diagram is formed by superposing a group of constellation points from each information stream, and each constellation point represents a different multilayer modulation signal; and combining a plurality of bit code elements of each group of constellation points into bit code elements of constellation points on a system constellation diagram to generate constellation diagram mapping of the system.

3. The method of multi-layer modulation of signals in a communication system according to claim 2, wherein the phase adjustment method is specifically: the modulation signals from the same information stream are the same as the phase adjusted by the constellation points on the constellation diagram; after the phase adjustment, the code distance between any two adjacent constellation points on the system constellation diagram is minimum.

4. The device for multi-layer modulation of signals in a communication system is characterized by comprising a data distribution module, wherein the data distribution module is connected with a modulation matching module, the modulation matching module is connected with a constellation map module, the constellation map module is connected with a signal generation module, and the signal generation module is connected with a multi-layer aliasing module; wherein:

the data distribution module: dividing transmission data into a plurality of information streams with transmission requirements according to the transmission requirements of a communication system;

a modulation matching module: determining a signal modulation mode for each information flow according to the transmission requirement of the plurality of information flows; the method for determining the modulation mode of the signal for each channel of information stream specifically comprises the following steps: selecting the system and keying mode of the digital keying signal according to the transmission requirement of each path of information stream;

wherein, the system includes: binary, quaternary, quinary, octal, nonal, hexadecimal and heptanal; the keying manner comprises the following steps: amplitude keying modulation, frequency shift keying modulation, phase shift keying modulation, quadrature amplitude modulation, and orthogonal frequency division multiplexing modulation;

a constellation mapping module: setting constellation map for all modulation signals under each modulation mode; the constellation map setting specifically comprises:

setting a bit code element for each modulation signal on a constellation diagram corresponding to the modulation mode; the code length of all code elements under the same modulation mode is equal, the code words are different, and the number of all code elements under the same modulation mode is equal to the binary number in the modulation mode; the bit code element is a binary digit sequence;

allocating different bit code elements for all modulation signals under each modulation mode; and the allocated bit code element needs to satisfy the condition: under the same modulation mode, the code distance of bit code elements distributed by any two modulation signals is in direct proportion to the space distance of constellation points of the modulation signals on a constellation diagram;

a signal generation module: generating a modulation signal for each channel of information stream according to the constellation mapping of the data to be transmitted of the information stream and the modulation signal;

a multi-layer aliasing module: and combining the modulation signals and the constellation map mapping of the multi-channel information stream according to the transmission requirement and the channel state information of the multi-channel information stream to generate a multi-layer modulation signal and the constellation map mapping of the communication system.

5. The apparatus for multi-layer modulation of signals in a communication system according to claim 4, wherein the multi-layer aliasing module combines the modulated signals of the multiple information streams to generate the multi-layer modulated signals and the constellation map of the communication system specifically comprises:

according to the transmission requirements of the multi-channel information streams, amplitude adjustment is carried out on modulation signals from different information streams and constellation points on a constellation diagram; according to the transmission requirements of the multi-channel information streams, carrying out phase adjustment on modulation signals from different information streams and constellation points on a constellation diagram; superposing the plurality of modulation signals after amplitude and phase adjustment to generate a multilayer modulation signal of the system; combining the plurality of constellation diagrams after the amplitude and phase adjustment to generate constellation diagram mapping of the system;

each constellation point on the combined system constellation diagram is formed by superposing a group of constellation points from each information stream, and each constellation point represents a different multilayer modulation signal; and combining a plurality of bit code elements of each group of constellation points into bit code elements of constellation points on a system constellation diagram to generate constellation diagram mapping of the system.

6. The apparatus for multi-layer modulation of a signal in a communication system as claimed in claim 5, wherein the phase adjustment in the multi-layer aliasing module is specifically: the modulation signals from the same information stream are the same as the phase adjusted by the constellation points on the constellation diagram; after the phase adjustment, the code distance between any two adjacent constellation points on the system constellation diagram is minimum.

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