CN110233650B - A kind of power adjustment method and system in MIMO-NOMA system - Google Patents

Abstract

The present invention provides a power adjustment method in a MIMO-NOMA system. The method includes: determining the downlink initial power of each user on each RE according to the downlink per RE power and the path loss of each user; and adjusting the downlink initial power of each user according to the received CQI reported by each user. The allocation of the downlink power of each user in the present application meets the demodulation requirements of the user receiver, so that the user can demodulate the signal, and the spectral efficiency of the system is improved, and the access capacity of the system is increased.

Description

A kind of power adjustment method and system in MIMO-NOMA system

technical field

The invention belongs to the field of mobile communication, and in particular relates to a power adjustment method and system in a MIMO-NOMA system.

Background technique

With the continuous growth of the popular application of smart terminals and the demand for new mobile services, the demand for wireless transmission rates has grown exponentially, providing a broader application prospect for 5G. Compared with 4G, 5G will greatly improve the spectral efficiency, transmission rate and system capacity, and realize the sustainable development of mobile communication network.

The emergence of each generation of mobile communication system is accompanied by the innovation of multiple access technology. NOMA (Non-Orthogonal Multiple Access Technology) changes the power domain from being exclusively owned by a single user to being shared by multiple users, thereby greatly improving the spectral efficiency. Therefore, NOMA has become one of the key technologies in 5G; MIMO (Multiple-Input Multiple- Output) technology has been widely used in 4G. MIMO achieves multiple transmissions and multiple receptions through multiple antennas, making full use of space resources and improving spectral efficiency, system capacity, and transmission reliability.

Therefore, in order to further improve the spectral efficiency of the communication system, the combination of NOMA and MIMO has become one of the hotspot technologies in the field of 5G research. In the MIMO-NOMA system, the communication equipment is equipped with multiple antennas, and the users also include multiple groups. Therefore, how to solve the power control of different users transmitting data in the uplink and receiving data in the downlink is one of the key issues in the MIMO-NOMA system. Power control is based on the evaluation of indicators such as the received signal strength and signal-to-noise ratio at the receiving end, and timely changing the transmit power to compensate for path loss and fading in the wireless channel, so as to ensure the quality of user communication. Reduce the transmission power without causing interference to other users in the wireless resources, increasing the system capacity.

However, the existing power adjustment method in the MIMO-NOMA system mainly uses the preset formula or mathematical methods such as graph theory to theoretically calculate the power allocated to each user according to the current channel conditions. Although this power adjustment method is simple , but the application in actual engineering development is difficult, and when the uplink and downlink channel estimation is inaccurate, the error of this power adjustment method is large, which may make the receiver unable to correctly demodulate the signal of the corresponding user.

SUMMARY OF THE INVENTION

Therefore, the purpose of the present invention is to overcome the above-mentioned defects of the prior art, and to provide a power adjustment method and system in a MIMO-NOMA system.

The purpose of this invention is to realize through the following technical solutions:

In one aspect, the present invention provides a power adjustment method in a MIMO-NOMA system, including:

According to the downlink power of each RE and the path loss of each user, determine the initial downlink power of each user on each RE;

The downlink initial power of each user is adjusted according to the received CQI reported by each user.

In the above method, the downlink initial power of each user on each RE is determined according to the downlink power per RE and the path loss of each user, including:

The downlink initial power of the first user is greater than the sum of the downlink initial power of the remaining users and the demodulation threshold of the user receiver; the path loss of the first user is smaller than that of the remaining users;

The difference between the initial downlink power of each other user and the corresponding path loss is greater than the coverage threshold;

The sum of the downlink initial powers of different users on each RE is equal to the power per RE.

In the above method, the downlink initial power of each user is adjusted according to the received CQI reported by each user, including:

Determine whether the CQI reported by each user meets the specified condition according to the NP criterion, and if so, adjust the downlink initial power of each user.

In the above method, the first user and the second user are multiplexed on each RE;

Correspondingly, determine whether the CQI reported by each user meets the specified condition according to the NP criterion, and if so, adjust the downlink initial power of each user, including:

Determine whether P CQI values in the N CQI values reported by the first user and the second user are smaller than the low threshold, if so, when it is determined that the signal strength received by the first user is greater than the signal strength of the second user, the first user The downlink initial power of the first user is increased by the first preset value, and the downlink initial power of the second user is reduced by the first preset value; when it is determined that the signal strength received by the first user is lower than the signal strength of the second user, the downlink initial power of the first user is reduced by the first preset value. The power is reduced by a first preset value, and the downlink initial power of the second user is increased by a first preset value;

The sum of the adjusted downlink power of the first user and the downlink power of the second user is equal to the power per RE.

Or, determine whether P CQI values in the N CQI values reported by the first user are greater than the low threshold, and whether P CQI values in the N CQI values reported by the second user are less than the low threshold, if so, set the first The downlink initial power of the user is decreased by a first preset value, and the downlink initial power of the second user is increased by the first preset value;

The sum of the adjusted downlink power of the first user and the downlink power of the second user is equal to the power per RE.

Or, determine whether P CQI values in the N CQI values reported by the first user are less than the low threshold, and whether P CQI values in the N CQI values reported by the second user are greater than the low threshold, if so, determine whether the first CQI value is greater than the low threshold. The downlink initial power of the user is increased by a first preset value, and the downlink initial power of the second user is decreased by the first preset value;

The sum of the adjusted downlink power of the first user and the downlink power of the second user is equal to the power per RE.

In the above method, before adjusting the downlink power allocated to each user according to the received CQI reported by each user, the method further includes:

It is judged whether the current time slot is within the power adjustment period, and if so, the step of adjusting the downlink power allocated to each user according to the received CQI reported by each user is performed.

In the above method, it also includes:

The user terminal determines the downlink channel state information reference signal power of each user according to the downlink channel state information reference signal power of the base station and the downlink initial power allocation ratio;

The user terminal calculates the downlink signal-to-noise ratio of each user according to the reference signal power and path loss of each user's downlink channel state information;

The user terminal maps the multiple SINRs of each user to corresponding CQIs, and sends the CQIs to the base station.

In another aspect, the present invention provides a power adjustment system in a MIMO-NOMA system, including:

The first determining module determines the downlink initial power of each user on each RE according to the downlink power per RE and the path loss of each user;

a second determining module, configured to determine the downlink channel state information reference signal power of each user according to the downlink channel state information reference signal power and the downlink initial power allocation ratio of the base station;

a calculation module, configured to calculate the downlink signal-to-noise ratio of each user according to the downlink channel state information reference signal power and path loss of each user;

a mapping module, used to map the multiple SINRs of each user into corresponding CQIs, and send the CQIs to the adjustment module;

An adjustment module, configured to adjust the downlink initial power of each user according to the received CQI reported by each user.

In another aspect, the present invention provides an electronic device, comprising:

processor;

a memory for storing the processor-executable instructions;

The executable instructions, when executed by the processor, cause the processor to perform the above-described method for power adjustment in a MIMO-NOMA system.

In yet another aspect, the present invention provides a computer-readable storage medium on which computer program instructions are stored, the computer program instructions, when executed by a processor, cause the processor to execute the power in the MIMO-NOMA system adjustment method.

Compared with the prior art, the advantages of the present invention are:

1) In this embodiment of the present invention, the downlink initial power of each user on each RE is determined according to the downlink power of each RE and the path loss of each user, and then the downlink initial power of each user is performed according to the received CQI reported by each user. The adjustment makes the downlink power allocation of each user meet the demodulation requirements of the user receiver, so that the user receiver can demodulate the signal, and the spectral efficiency of the system is improved, and the access capacity of the system is increased.

2) In this embodiment of the present invention, the user terminal determines the downlink channel state information reference signal power of each user according to the downlink channel state information reference signal power of the base station and the downlink initial power allocation ratio, and then the user terminal refers to the downlink channel state information of each user. Signal power and path loss, calculate the downlink signal-to-noise ratio of each user, and finally the user end maps the multiple SINRs of each user to the corresponding CQI, and sends the CQI to the base station, so that the base station can perform downlink signals for each user according to the CQI. The initial power is adjusted so that the allocation of downlink power of each user meets the demodulation requirements of the user receiver, so that the user receiver can demodulate the signal, and the spectrum efficiency of the system is improved, and the access capacity of the system is increased. .

Description of drawings

The embodiments of the present invention will be further described below with reference to the accompanying drawings, wherein:

Figure 1 is a schematic diagram of the MIMO-NOMA system model;

2 is a schematic flowchart of a power adjustment method in a MIMO-NOMA system provided by an embodiment of the present invention;

3 is a schematic structural diagram of a power adjustment system in a MIMO-NOMA system provided by an embodiment of the present invention;

4 is a schematic structural diagram of a power adjustment system in another MIMO-NOMA system provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed ways

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 accompanying drawings through specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Figure 1 is a schematic diagram of a MIMO-NOMA system model, wherein Figure 1(a) is a schematic diagram of an uplink transmission process, Figure 1(b) is a schematic diagram of an uplink reception process, Figure 1(c) is a schematic diagram of a downlink transmission process, and Figure 1(d) It is a schematic diagram of the downlink receiving process.

As shown in Figure 1(a), the information generated by different users is first subjected to channel coding and modulation, and then to different antennas through layer mapping and precoding, and finally sent out through PDMA coding and OFDM modulation;

As shown in Figure 1(b), after the base station receives signals from different users, it undergoes OFDM demodulation, and then undergoes PDMA detection, space-time decoding, demodulation, and channel detection. Then the user signal is eliminated, and the signals of other users are detected respectively;

As shown in Figure 1(c), the base station encodes and modulates the signals of different users through the channel, then through layer mapping and precoding to different antenna ports, and then through PDMA encoding, the signals of different users are stored in the same resource element (ResourceElement, Hereinafter referred to as RE) multiplexing, and finally sent out through OFDM modulation;

As shown in Figure 1(d), when the user receives signals from different antennas, it first goes through OFDM demodulation, then goes through PDMA multi-user detection, space-time decoding, demodulation, and finally recovers the signal through the channel decoding process. Among them, in the PDMA multi-user detection process, the user with high power is detected first, and if the signal is the original user signal, the detection is stopped; otherwise, the detected high-power user signal is eliminated from the received signal, and the detection continues.

Various specific embodiments of the present invention are described in detail below:

FIG. 2 is a schematic flowchart of a power adjustment method in a MIMO-NOMA system provided by an embodiment of the present invention. As shown in FIG. 2 , the method includes:

101. Determine the downlink initial power of each user on each RE according to the downlink power per RE and the path loss of each user;

In the NOMA-MIMO system, each RE is multiplexed by multiple users. The 3GPP protocol does not specify how to allocate the downlink power of different users of each RE. The embodiment of the present invention takes the multiplexing of two users per RE as an example to illustrate how to The downlink power of two users of each RE is allocated.

其中N_BS为基站天线，

为下行单天线每RE的功率，

其中，

为基站最大发送功率，Δf为载波间隔，

为下行RB数，

为每RB载波数。In the 3GPP protocol, set the downlink power per RE as P _RE ,

where N _BS is the base station antenna,

is the downlink single-antenna power per RE,

in,

is the maximum transmit power of the base station, Δf is the carrier spacing,

is the number of downlink RBs,

is the number of carriers per RB.

Assuming that the path loss of the first user is smaller than the path loss of the second user, the initial downlink power allocation for different users of each RE must satisfy:

The downlink initial power of the first user is greater than the sum of the downlink initial power of the remaining users and the demodulation threshold of the user receiver; the path loss of the first user is smaller than that of the remaining users;

The difference between the initial downlink power of each other user and the corresponding path loss is greater than the coverage threshold;

The sum of the downlink initial powers of different users on each RE is equal to the power per RE.

For example, suppose PL ₁ is the path loss of the first user, PL ₂ is the path loss of the second user, P _down1 is the downlink initial power of the first user, and P _down2 is the downlink initial power of the second user. When PL ₁ <PL ₂ o'clock

Among them, α _Thr is the demodulation threshold of the user SIC receiver, and β _Thr is the coverage threshold.

Similarly, if the path loss of the second user is smaller than the path loss of the first user, that is, PL ₁ >PL ₂ , the initial downlink power allocation for different users of each RE must satisfy:

If there are three users per RE, when PL ₁ < PL ₂ , PL ₁ < PL ₃

Wherein, P _down3 is the initial downlink power of the third user, and by analogy, the downlink initial power allocation of multiple users multiplexed on each RE can be obtained.

In the embodiment of the present invention, it is assumed that the base station has two antennas, the maximum transmit power of the base station is 46 dBm, and the downlink signal bandwidth is 20 MHz, then the base station includes 100 RBs, and each RB includes 12 REs. It is assumed that the path losses of the two users multiplexed by each RE are respectively is 80dB and 95dB, then P _RE is P _RE =46dBm-10log(100*12)=15dBm

得到第一用户和第二用户的下行初始功率，P_down1＝12，P_down2＝3。Suppose the demodulation threshold α _Thr of the user SIC receiver is 6dB, the coverage threshold β _Thr is -110dBm, the path loss PL ₁ of the first user is 80dB, and the path loss PL ₂ of the second user is 95dB, then according to

The downlink initial powers of the first user and the second user are obtained, P _down1 =12, P _down2 =3.

Further, the embodiments of the present invention also include:

a. The user terminal determines the downlink channel state information reference signal power of each user according to the base station's downlink channel state information reference signal power and the downlink initial power allocation ratio;

为下行功率分配比例，

可以根据图1所示的方法中步骤101得到，P_CRS，1为第一用户的下行信道状态信息参考信号，P_CRS，2为第二用户的下行信道状态信息参考信号，则

The embodiment of the present invention continues to take the multiplexing of two users per RE as an example for description, and assumes that the _PCRS is the downlink channel state information reference signal of the base station,

is the downlink power allocation ratio,

It can be obtained according to step 101 in the method shown in FIG. 1 , P _{CRS, 1} is the downlink channel state information reference signal of the first user, and P _{CRS, 2} is the downlink channel state information reference signal of the second user, then

b. The user terminal calculates the downlink signal-to-noise ratio of each user according to the reference signal power and path loss of each user's downlink channel state information;

Let SINR ₁ be the downlink signal-to-noise ratio of the first user, and SINR ₂ be the downlink signal-to-noise ratio of the second user. When P _rx1 > P _rx2 , the SIC receivers of the first user and the second user first demodulate the first user. user's signal, and then demodulate the second user's signal, then

Wherein, I _other1 is the interference information of other downlink cells to the first user, I _other2 is the interference information of other downlink cells to the second user, N _o,1 is the noise floor of the first user, and N _o,2 is the second user noise floor.

Similarly, when P _rx1 <P _rx2 , then

c. The user terminal maps multiple SINRs of each user to corresponding CQIs, and sends the CQIs to the base station, so that the base station adjusts the downlink initial power of each user according to the CQIs.

Table 1 is the 4-bit CQI table in the 3GPP protocol. As shown in Table 1, there are 16 types of CQIs, that is, the channel quality is quantized into serial numbers from 0 to 15, and each CQI corresponds to a modulation and coding method, so that each CQI can be determined. Downlink power corresponding to each user.

Table 1

102. Adjust the initial downlink power of each user according to the received CQI reported by each user.

It should be noted that the adjustment of downlink power is determined by the base station, and the base station, as the transmitter, does not know what the channel conditions are. Therefore, the base station adjusts the initial downlink power of each user according to the CQI reported by the receiving user, and obtains each user. final downlink power.

The process of adjusting the downlink initial power of the user by the base station is specifically described below:

Determine whether the CQI reported by each user meets the specified condition according to the NP criterion, and if so, adjust the downlink initial power of each user.

Specifically, determine whether P CQI values in the N CQI values reported by the first user and the second user are smaller than the low threshold, and if so, when it is determined that the signal strength received by the first user is greater than the signal strength of the second user, reducing the initial downlink power of the first user by a first preset value, and reducing the initial downlink power of the second user by the first preset value;

When it is determined that the signal strength received by the first user is lower than the signal strength of the second user, the downlink initial power of the first user is decreased by a first preset value, and the downlink initial power of the second user is increased by a first preset value;

The sum of the adjusted downlink power of the first user and the downlink power of the second user is equal to the power per RE.

Or, determine whether P CQI values in the N CQI values reported by the first user are greater than the low threshold, and whether P CQI values in the N CQI values reported by the second user are less than the low threshold, if so, set the first The downlink initial power of the user is decreased by a first preset value, and the downlink initial power of the second user is increased by the first preset value;

The sum of the adjusted downlink power of the first user and the downlink power of the second user is equal to the power per RE.

Or, determine whether P CQI values in the N CQI values reported by the first user are less than the low threshold, and whether P CQI values in the N CQI values reported by the second user are greater than the low threshold, if so, determine whether the first CQI value is greater than the low threshold. The downlink initial power of the user is increased by a first preset value, and the downlink initial power of the second user is decreased by the first preset value;

The sum of the adjusted downlink power of the first user and the downlink power of the second user is equal to the power per RE.

In this embodiment of the present invention, the first preset value may be one or more steps, and specifically, the first preset value may be set according to the speed of power adjustment, which is not specifically limited in this embodiment of the present invention.

Table 2 is the adjustment table of downlink initial power according to CQI, wherein, CQI ₁ is the CQI reported by the first user, CQI ₂ is the CQI reported by the second user, CQI _Thr1 is the low threshold of CQI ₁ , and CQI _Thr2 is the CQI ₂ . Low threshold, P rx1 is the signal strength received by the first user, and P _rx2 is the signal strength _received by the second user.

Table 2

Further, before adjusting the downlink power allocated to each user according to the received CQI reported by each user, the method further includes:

It is judged whether the current time slot is within the power adjustment period, and if so, the step of adjusting the downlink power allocated to each user according to the received CQI reported by each user is performed.

In the NP criterion in the embodiment of the present invention, set N=4, P=3, CQI _Thr1 =4, CQI _Thr2 =12, if the current time slot is within the power adjustment period, the four CQIs reported by the first user are {4, 3, 2, 2}, that is, 3 of the 4 CQIs reported by the first user are less than the low threshold, and the 4 CQIs reported by the second user are {6, 7, 7, 8}, that is, the CQIs reported by the second user are respectively {6, 7, 7, 8}. If the four CQIs are all greater than the low threshold, the downlink initial power of the first user is increased by a first preset value, and the downlink initial power of the second user is decreased by the first preset value, and the first preset value is set to 0.5dBm, Then the initial downlink power of the first user is increased by 0.5dBm, and the initial downlink power of the second user is decreased by 0.5dBm.

The embodiment of the present invention determines the downlink initial power of each user on each RE according to the downlink power of each RE and the path loss of each user, and then adjusts the downlink initial power of each user according to the received CQI reported by each user, The allocation of downlink power of each user meets the demodulation requirements of the user receiver, so that the user receiver can demodulate the signal, and the spectral efficiency of the system is improved, and the access capacity of the system is increased; The downlink channel state information reference signal power and the downlink initial power allocation ratio determine the downlink channel state information reference signal power of each user, and then the user end calculates each user according to the downlink channel state information reference signal power and path loss of each user. The downlink signal-to-noise ratio of each user is determined, and finally the user end maps the multiple SINRs of each user to the corresponding CQIs, and sends the CQIs to the base station, so that the base station adjusts the downlink initial power of each user according to the CQI, so that each user's downlink initial power The allocation of downlink power satisfies the demodulation requirements of the user receiver, so that the user receiver can demodulate the signal, and the spectrum efficiency of the system is improved, and the access capacity of the system is increased.

FIG. 3 is a schematic structural diagram of a power adjustment system in a MIMO-NOMA system provided by an embodiment of the present invention. As shown in FIG. 3 , the system includes: a first determination module 11 and an adjustment module 12;

The first determination module 11 determines the downlink initial power of each user on each RE according to the downlink power per RE and the path loss of each user;

Specifically, the initial downlink power of the first user determined by the first determining module 11 is greater than the sum of the initial downlink power of the remaining users and the demodulation threshold of the user receiver; the path loss of the first user is smaller than that of the remaining users;

The difference between the initial downlink power of each other user and the corresponding path loss is greater than the coverage threshold;

The sum of the downlink initial powers of different users on each RE is equal to the power per RE.

The adjustment module 12 is configured to adjust the downlink initial power of each user according to the received CQI reported by each user.

4 is a schematic structural diagram of a power adjustment system in another MIMO-NOMA system provided by an embodiment of the present invention. Further, the system further includes: a second determination module 21, a calculation module 22, and a mapping module 23;

The second determination module 21 is configured to determine the downlink channel state information reference signal power of each user according to the downlink channel state information reference signal power and the downlink initial power allocation ratio of the base station;

The calculation module 22 is used for calculating the downlink signal-to-noise ratio of each user according to the downlink channel state information reference signal power and path loss of each user;

The mapping module 23 is configured to map multiple SINRs of each user into corresponding CQIs, and send the CQIs to the base station, so that the base station adjusts the downlink initial power of each user according to the CQI.

Specifically, the adjustment module 12 includes a determination unit and an adjustment unit;

A determination unit, for determining whether the CQI reported by each user satisfies the specified condition according to the NP criterion, and if so, triggers the adjustment unit;

The adjustment unit is used to adjust the downlink initial power of each user.

The embodiment of the present invention takes the multiplexing of two users per RE as an example to describe how to allocate the downlink power of the two users per RE, but is not limited to multiplexing two users per RE.

Further, the determining unit includes a first determining subunit and a second determining subunit; the adjusting unit includes a first adjusting subunit and a second adjusting subunit;

a first determination subunit, configured to determine whether P CQI values are less than the low threshold in the N CQI values reported by the first user and the second user, and if so, trigger the second determination subunit;

a second determination subunit, configured to determine whether the signal strength received by the first user is greater than the signal strength of the second user, and if so, trigger the first adjustment subunit; otherwise, trigger the second adjustment subunit;

a first adjustment subunit, configured to reduce the downlink initial power of the first user by a first preset value, and reduce the downlink initial power of the second user by the first preset value;

a second adjustment subunit, configured to decrease the downlink initial power of the first user by a first preset value, and increase the downlink initial power of the second user by the first preset value;

The sum of the downlink power of the first user and the downlink power of the second user after adjustment by the first adjustment subunit or the second adjustment subunit is equal to the power per RE.

Or, the determining unit is configured to determine whether P CQI values in the N CQI values reported by the first user are greater than the low threshold, and whether P CQI values in the N CQI values reported by the second user are less than the low threshold, if yes , trigger the adjustment unit;

Correspondingly, the adjustment unit is configured to reduce the downlink initial power of the first user by a first preset value, and increase the downlink initial power of the second user by the first preset value;

The sum of the downlink power of the first user and the downlink power of the second user adjusted by the adjusting unit is equal to the power per RE.

Or, the determining unit is configured to determine whether P CQI values in the N CQI values reported by the first user are less than the low threshold, and whether P CQI values in the N CQI values reported by the second user are greater than the low threshold, if yes , trigger the adjustment unit;

Correspondingly, the adjustment unit is configured to increase the downlink initial power of the first user by a first preset value, and reduce the downlink initial power of the second user by the first preset value;

The sum of the downlink power of the first user and the downlink power of the second user adjusted by the adjusting unit is equal to the power per RE.

Further, the embodiment of the present invention further includes a determination module for determining whether the current time slot is within the power adjustment period, and if so, triggers the adjustment module.

The embodiment of the present invention determines the downlink initial power of each user on each RE according to the downlink power of each RE and the path loss of each user, and then adjusts the downlink initial power of each user according to the received CQI reported by each user, The downlink power allocation of each user satisfies the demodulation requirements of the user receiver, so that the user receiver can demodulate the signal, and the spectral efficiency of the system is improved, and the access capacity of the system is increased; further, the present invention In the embodiment, the user terminal determines the downlink channel state information reference signal power of each user according to the downlink channel state information reference signal power of the base station and the downlink initial power allocation ratio, and then the user terminal determines the downlink channel state information reference signal power of each user according to the power and Path loss, calculate the downlink signal-to-noise ratio of each user, and finally the user end maps the multiple SINRs of each user to the corresponding CQI, and sends the CQI to the base station, so that the base station can perform a downlink initial power analysis of each user according to the CQI. The adjustment makes the downlink power allocation of each user meet the demodulation requirements of the user receiver, so that the user receiver can demodulate the signal, and the spectrum efficiency of the system is improved, and the access capacity of the system is increased.

FIG. 5 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. Hereinafter, an electronic device according to an embodiment of the present application is described with reference to the drawings.

As shown in FIG. 5 , the electronic device 100 includes one or more processors 101 and a memory 102 .

Processor 101 may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and/or instruction execution capabilities, and may control other components in electronic device 100 to perform desired functions.

Memory 102 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and/or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and/or cache memory, or the like. The non-volatile memory may include, for example, read only memory (ROM), hard disk, flash memory, and the like. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 101 may execute the program instructions to implement power adjustment in the MIMO-NOMA system of the various embodiments of the present application described above methods and/or other desired functionality.

In one example, the electronic device 100 may also include an input device 103 and an output device 104 interconnected by a bus system and/or other form of connection mechanism (not shown).

For example, the input device 103 may include a camera device for capturing input images. In addition, the input device 103 may also include, for example, a keyboard, a mouse, and the like.

The output device 104 can output various information to the outside, including the determined foreground mask feature map. The output devices 104 may include, for example, displays, speakers, printers, and communication networks and their connected remote output devices, among others.

Of course, for simplicity, only some of the components in the electronic device 100 related to the present application are shown in FIG. 100 , and components such as buses, input/output interfaces, and the like are omitted. In addition to this, the electronic device 100 may also include any other appropriate components according to specific applications.

Exemplary computer program product and computer readable storage medium

In addition to the methods and apparatuses described above, embodiments of the present application may also be computer program products comprising computer program instructions that, when executed by a processor, cause the processor to perform the "exemplary methods" described above in this specification The steps in the power adjustment method in the MIMO-NOMA system according to various embodiments of the present application described in the section.

The computer program product can write program codes for performing the operations of the embodiments of the present application in any combination of one or more programming languages, including object-oriented programming languages, such as Java, C++, etc. , also includes conventional procedural programming languages, such as "C" language or similar programming languages. The program code may execute entirely on the user computing device, partly on the user device, as a stand-alone software package, partly on the user computing device and partly on a remote computing device, or entirely on the remote computing device or server execute on.

In addition, embodiments of the present application may also be computer-readable storage media having computer program instructions stored thereon, the computer program instructions, when executed by a processor, cause the processor to perform the above-mentioned "Example Method" section of this specification Steps in a method for power adjustment in a MIMO-NOMA system according to various embodiments of the present application described in .

The computer-readable storage medium may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may include, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses or devices, or a combination of any of the above. More specific examples (non-exhaustive list) of readable storage media include: electrical connections with one or more wires, portable disks, hard disks, random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM or flash memory), optical fiber, portable compact disk read only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, advantages, effects, etc. mentioned in the present application are only examples rather than limitations, and these advantages, advantages, effects, etc., are not considered to be Required for each embodiment of this application. In addition, the specific details disclosed above are only for the purpose of example and easy understanding, rather than limiting, and the above-mentioned details do not limit the application to be implemented by using the above-mentioned specific details.

The block diagrams of devices, apparatus, apparatuses, and systems referred to in this application are merely illustrative examples and are not intended to require or imply that the connections, arrangements, or configurations must be in the manner shown in the block diagrams. As those skilled in the art will appreciate, these means, apparatuses, apparatuses, systems may be connected, arranged, and configured in any manner. Words such as "including", "including", "having" and the like are open-ended words meaning "including but not limited to" and are used interchangeably therewith. As used herein, the words "or" and "and" refer to and are used interchangeably with the word "and/or" unless the context clearly dictates otherwise. As used herein, the word "such as" refers to and is used interchangeably with the phrase "such as but not limited to".

It should also be pointed out that in the apparatus, equipment and method of the present application, each component or each step can be decomposed and/or recombined. These disaggregations and/or recombinations should be considered as equivalents of the present application.

The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Therefore, this application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The foregoing description has been presented for the purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims (10)

1. A power adjustment method in a MIMO-NOMA system, comprising: According to the downlink power of each RE and the path loss of each user, determine the initial downlink power of each user on each RE, which must satisfy: The downlink initial power of the first user is greater than the sum of the downlink initial power of the remaining users and the demodulation threshold of the user receiver; the path loss of the first user is smaller than that of the remaining users; The difference between the initial downlink power of each other user and the corresponding path loss is greater than the coverage threshold; The sum of the downlink initial powers of different users on each RE is equal to the power per RE; The downlink initial power of each user is adjusted according to the received CQI reported by each user. 2. The method according to claim 1, wherein the downlink initial power of each user is adjusted according to the received CQI reported by each user, comprising: Determine whether the CQI reported by each user meets the specified condition according to the NP criterion, and if so, adjust the downlink initial power of each user. 3. The method according to claim 2, wherein the first user and the second user are multiplexed on each RE; Determine whether the CQI reported by each user meets the specified conditions according to the NP criterion, and if so, adjust the downlink initial power of each user, including: Determine whether P CQI values in the N CQI values reported by the first user and the second user are smaller than the low threshold, if so, when it is determined that the signal strength received by the first user is greater than the signal strength of the second user, the first user The downlink initial power of the first user is increased by the first preset value, and the downlink initial power of the second user is reduced by the first preset value; when it is determined that the signal strength received by the first user is lower than the signal strength of the second user, the downlink initial power of the first user is reduced by the first preset value. The power is reduced by a first preset value, and the downlink initial power of the second user is increased by a first preset value; The sum of the adjusted downlink power of the first user and the downlink power of the second user is equal to the power per RE. 4. The method according to claim 2, wherein the first user and the second user are multiplexed on each RE; Determine whether the CQI reported by each user meets the specified conditions according to the NP criterion, and if so, adjust the downlink initial power of each user, including: Determine whether P of the N CQI values reported by the first user are greater than the low threshold, and whether P of the N CQI values reported by the second user are less than the low threshold. The downlink initial power is decreased by a first preset value, and the downlink initial power of the second user is increased by a first preset value; The sum of the adjusted downlink power of the first user and the downlink power of the second user is equal to the power per RE. 5. The method according to claim 2, wherein the first user and the second user are multiplexed on each RE; Determine whether the CQI reported by each user meets the specified conditions according to the NP criterion, and if so, adjust the downlink initial power of each user, including: Determine whether P of the N CQI values reported by the first user are less than the low threshold, and whether P of the N CQI values reported by the second user are greater than the low threshold. The downlink initial power is increased by a first preset value, and the downlink initial power of the second user is decreased by the first preset value; The sum of the adjusted downlink power of the first user and the downlink power of the second user is equal to the power per RE. 6. The method according to any one of claims 1 to 5, before adjusting the downlink power allocated to each user according to the received CQI reported by each user, further comprising: It is judged whether the current time slot is within the power adjustment period, and if so, the step of adjusting the downlink power allocated to each user according to the received CQI reported by each user is performed. 7. The method of any one of claims 1 to 5, comprising: The user terminal determines the downlink channel state information reference signal power of each user according to the downlink channel state information reference signal power of the base station and the downlink initial power allocation ratio; The user terminal calculates the downlink signal-to-noise ratio of each user according to the reference signal power and path loss of each user's downlink channel state information; The user terminal maps the multiple SINRs of each user to corresponding CQIs, and sends the CQIs to the base station. 8. A power adjustment system in a MIMO-NOMA system, comprising: The first determining module determines the downlink initial power of each user on each RE according to the downlink power per RE and the path loss of each user; a second determining module, configured to determine the downlink channel state information reference signal power of each user according to the downlink channel state information reference signal power and the downlink initial power allocation ratio of the base station; a calculation module, configured to calculate the downlink signal-to-noise ratio of each user according to the downlink channel state information reference signal power and path loss of each user; a mapping module, used to map the multiple SINRs of each user into corresponding CQIs, and send the CQIs to the adjustment module; An adjustment module, configured to adjust the downlink initial power of each user according to the received CQI reported by each user. 9. An electronic device comprising: processor; a memory for storing the processor-executable instructions; The executable instructions, when executed by the processor, cause the processor to execute the method for adjusting power in a MIMO-NOMA system according to any one of claims 1 to 6. 10. A computer readable storage medium having computer program instructions stored thereon which, when executed by a processor, cause the processor to perform the MIMO- Power regulation method in NOMA system.

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