Water injection power allocation optimization method suitable for 5G network noma system

Abstract

The present invention provides a water injection power allocation optimization method suitable for 5G network NOMA system. The base station divides the power of subcarriers into M power blocks according to the coverage, user distribution and the number of users M, and constructs the power area of ​​each subcarrier. block vector, constructing a subcarrier power allocation matrix consisting of N subcarriers as rows and M user power blocks as columns; based on the subcarrier power allocation matrix, the power allocation optimization target is determined to be obtained in the kth power block The maximum transmission rate of the subcarrier; the power allocation of the unallocated power block is 0, and the power allocation of the worst signal-to-noise ratio in the allocated power block is the minimum power, and the linear water injection power allocation algorithm is used to calculate the same sub-carrier The power of all power blocks on the carrier; and then calculate the power of all users on each subcarrier. The invention can realize fast and optimized power distribution of each user on each sub-carrier, and improve the performance of the whole communication system.

Description

technical field [0001] The invention relates to a water injection power allocation optimization method suitable for a 5G network NOMA system, belonging to the technical field of mobile communications. Background technique [0002] The multiple access method of the fourth generation mobile communication technology (4G) is based on Orthogonal Frequency Division Multiple Access (OFDMA). From the perspective of multi-user information theory, the OFDMA method Only the inner bounds of the multi-user capacity bounds can be reached. The fifth-generation mobile communication technology (5G) is positioned as a wireless network with higher spectral efficiency, faster rate, and larger capacity. It is necessary to study more advanced multiple access technologies to obtain higher spectral efficiency. [0003] In the research on the multiple access technology of the existing 5G network, Non-Orthogonal Multiple Access (NOMA) is considered to be a very promising scheme. NOMA can be shared ...

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Problems solved by technology

[0002] The multiple access method of the fourth generation mobile communication technology (4G) is based on Orthogonal Frequency Division Multiple Access (OFDMA). From the perspective of multi-user information theory, the OFDMA method can only reach the inner bound of the multi-user capacity bound

In the NOMA system, since each user's signal is assigned to a different subcarrier, for the same subcarrier, each user's signal is required to be multiplexed, which requires that the signal power of different users should have a certain difference to ensure The SIC receiver at the receiving end demodulates correctly. Therefore, if the linear water filling algorithm is directly used, there will be a problem that the power difference between different users of the same carrier cannot satisfy the correct demodulation of the SIC receiver.

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