Multi-cell MIMO-NOMA (Multiple Input Multiple Output-Non-Orthogonal Multiple Access) optimal power distribution method based on interference suppression

Abstract

The invention belongs to the technical field of wireless communication, and discloses a multi-cell MIMO-NOMA (Multiple Input Multiple Output-Non-Orthogonal Multiple Access) optimal power distributionmethod based on interference suppression. According to the multi-cell MIMO-NOMA optimal power distribution method based on interference suppression, a multi-cell MIMO-NOMA system model and a user channel fading model are constructed; inter-cell interference is eliminated by an interference alignment technology to obtain a mathematical model of a power distribution problem; a tight lower bound coefficient and corresponding substitution are constructed, and the original power distribution problem is converted into a convex optimization problem; and an optimal power distribution solution is determined by an iterative algorithm. According to the invention, a multi-cell MIMO-NOMA interference elimination strategy is disclosed and on the basis of suppression on interference, the optimal multi-cell joint power distribution problem is derived, so that a system and a rate are maximized in the premise of ensuring user fairness and an optimal transmission solution in an optimal multi-cell MIMO-NOMA scene is obtained.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an interference suppression-based multi-cell MIMO-NOMA optimal power allocation method. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: Since the Non-orthogonal multiple access (NOMA) technology can effectively cope with the challenges of high throughput, low delay, and large connections in future wireless networks, it has been Extensive attention and research, and has become one of the 5G network alternatives. The NOMA technology allows multiple users to share the same power domain channel resources and perform differentiated scheduling on them. Therefore, compared with orthogonal multiple access (orthogonal multiple access, OMA), the NOMA technology can serve more users. In addition, the combination of NOMA technology and MIMO technology can further improve system performance. In rec...

AI Technical Summary

Problems solved by technology

[0004] (1) The precoding matrix and decoding matrix in a multi-cell NOMA network in the prior art avoid inter-cell interference, but an efficient power allocation strategy is not considered, the allocation efficiency is not high, and it is difficult to serve a large number of users, which limits the improvement of network capacity , not suitable for practical deployment

[0005] (2) Prior art 2 does not consider inter-cell interference cancellation and power allocation. It is an optimal power allocation strategy under ideal conditions and cannot be directly used in actual scenarios.

[0006] (3) The power allocation problem in the prior art No. 3 does not consider inter-cell interference, which leads to a serious degradation of cell edge user performance

Images