Power distribution system and power distribution method applied to NOMA (Non-orthogonal Multiple Access)

Abstract

The invention relates to a power distribution system and power distribution method applied to NOMA (Non-orthogonal Multiple Access). The system comprises a basic information obtaining module which is used for reading user channel state information, user target signal to interference plus noise ratios and a user grouping result; a user target rate calculation module which is used for calculating target rates of users in successfully grouped user groups; an intra-group minimum power calculation module which is used for calculating precoding vectors of each user group on the premise that user rates are greater than the target rates, thereby solving the minimum power required by each user group; a minimum power distribution module which is used for calculating power distribution factors of the users in each user group and distributing the minimum power required by each user group to the users according to the power distribution factors; and a power distribution result output module which is used for outputting a power distribution result in each user group. According to the technical scheme provided by the invention, a power distribution mechanism that the total power consumed by the users in the same group is the minimum can be supported.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a power distribution system and a power distribution method applied in NOMA. Background technique [0002] In the wireless communication system, with the continuous improvement of user needs, the number of users continues to increase, and the development of technologies such as the Internet of Things, artificial intelligence, and virtual reality, the wireless communication rate cannot meet future needs, so resources need to be optimized. Multiplexing to meet the needs of multi-user access. [0003] Multi-user access technologies are mainly divided into Orthogonal Multiple Access (OMA) and Non-orthogonal Multiple Access (NOMA). But OMA can't meet the explosive growth of users' demands in the next generation of mobile communication. Therefore, the research on NOMA has become a hot spot. [0004] NOMA, refers to allowing multiple users to multiplex the same time domai...

AI Technical Summary

Problems solved by technology

This reduces the complexity of receiver demodulation, but the fixed power allocation factor cannot be changed according to changes in user channel conditions, which limits the improvement of system capacity.

[0007] In the type 2 power allocation mechanism, the power allocation factor among users in the same group changes with the instantaneous user channel state. The commonly used power allocation method can change the power allocation factor in real time according to the user channel state change. The main dynamic power allocation mechanism There are mainly power allocation mechanisms based on the water injection algorithm, power allocation mechanisms based on TTPA, etc., which can better improve the system capacity, but these power allocation mechanisms are all allocated according to the given power, and the minimum rate that meets the user rate has not been obtained. power

[0008] For the above-mentioned power allocation mechanism applied to NOMA, the power allocation among users in the group is performed for a given power, and there is no power allocation mechanism that supports the minimum total power consumed by users in the same group.

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