Water injection power distribution optimization method suitable for 5G network NOMA system

Abstract

The invention provides a water injection power distribution optimization method suitable for a 5G network NOMA system. The method comprises the following steps: dividing power of sub-carrier into M power blocks by a base station according to the coverage range, user distribution and user number M, constructing a power block vector of each sub-carrier, and constructing a sub-carrier power distribution matrix formed by taking N sub-carriers as the row and the power blocks of M users as the line; determining a power distribution optimization target as the maximum transmission rate of the sub-carrier acquired at the k-th power block based on the sub-carrier power distribution matrix; distributing the power of the undistributed power block as zero, and the distributing the power with the worstsignal-to-noise ratio in the distributed power block as the minimum power, and computing to obtain the power of all power blocks on the same sub-carrier by adopting a linear water injection power distribution algorithm; and then computing to obtain the power of all users on each sub-carrier. Through the method provided by the invention, the fastness and optimization of the power distribution of each user on each sub-carrier can be realized, and the performance of the whole communication system is improved.

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 ...

AI Technical Summary

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.

Images