Research On MU-MIMO Enhancement Technology Based On Rate Splitting

With the continuous development of society,users have higher requirements for data transmission rate and quality.MU-MIMO technology can simultaneously serve multiple users on the same time and frequency resources,greatly improving the system capacity.To realize multiplexing gain,interference mitigation methods are required at the transmitter and their performance strongly relies on highly accurate CSIT,which is difficult to attain in practice.Rate splitting technology is a strategy to deal with multi-user or multi-cell interference,which divides one receiver's message into a common and a private part,and superposes the common message on top of precoded private messages.Rate splitting technology can reduce user interference and improve system freedom and transmission rate,which is one of the hot technologies of MU-MIMO.Focusing on the rate splitting technology,the main research contents of this paper are as follows:Firstly,the small-dimension antenna rate splitting scheme is studied,and numerical simulations are performed from different CSIT quality and different codebooks.Aiming at the problems existing in the power allocation algorithm in the scheme,a rate splitting scheme based on convex optimization is proposed.The effectiveness of the proposed scheme is proved by numerical simulation.Secondly,the FDD downlink-level simulation platform is built with reference to the LTE-A protocol,and the rate splitting scheme is applied to the link platform,and compared with the traditional multi-user scheme from the perspectives of throughput and block error rate,the performance of the rate splitting scheme is verified.Aiming at the problems in link simulation,two different ways of power allocation are proposed from different perspectives.The algorithm improves the system performance and verifies its effectiveness on the link platform.Aiming at the problems in link simulation,two different ways of power allocation are proposed from different perspectives.The algorithm improves the system performance and verifies its effectiveness on the link platform.Thirdly,the application of rate splitting technology in Massive MIMO scenarios is studied,and the rate performance of rate splitting scheme is explored in different CSIT quality scenarios.