关键词: 多输入多输出, 多址接入信道, 干扰消除, 完美空时分组编码, 传输效率, 反馈量

Abstract: Previous studies have shown that multi-user interference can be eliminated by means of pre-coding for four-user Multiple Input Multiple Output Multi-Access Channel（MIMO-MAC）. However, a large amount of feedback information is required. For this problem, a non-feedback interference cancellation method is proposed for this scene. Perfect space-time block code is used at each user, and the transmission of each code is properly designed so that multi-user interference can be eliminated by linear processing received signals at the receiver. The proposed scheme greatly reduces feedback amount while the transmission efficiency, the average transmission power of each symbol and diversity gain of the proposed scheme are the same as that of the existing scheme. Simulation results demonstrate the validity of the proposed scheme.

Key words: Multiple Input Multiple Output（MIMO）, multi-access channel, interference cancellation, perfect space-time block code, transmission efficiency, feedback amount