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以往针对多天线系统的研究多侧重于分别采用分集或空间复用的工作方式,来提高系统可靠性或传输速率,但这样往往导致另一种增益的损失。为此将二者联合考虑,提出一种闭环多天线系统的最优分集复用切换判决准则,并进一步给出了低复杂度次优判决算法。给出了多天线系统的误码率近似边界,并以最小误码率为准则推导出了分集与复用工作模式的折衷判决关系,在发射端根据反馈信息采用不同工作方式来满足系统的要求。所提算法具有较低的计算量,性能与最优算法相近,可根据信道实时状态来选择不同的工作模式,满足无线通信系统实时性和快速性的要求。仿真结果验证了所提算法的优越性和可行性。
In the past, the research on multi-antenna systems mainly focused on the working methods of diversity and spatial multiplexing, respectively, to improve system reliability or transmission rate, but this often led to another loss of gain. Therefore, we consider the two together and propose a decision rule of optimal diversity and multiplexing handover in closed-loop multi-antenna system. Furthermore, the sub-optimal decision algorithm with low complexity is given. Based on the minimum bit error rate (BER), the trade-off relationship between diversity and multiplex mode of operation is deduced. Based on the feedback information, different working modes are used to meet the system requirements . The proposed algorithm has low computational complexity and performance is similar to the optimal algorithm. Different working modes can be chosen according to the real-time status of the channel to meet the requirements of real-time and rapidity of the wireless communication system. Simulation results verify the superiority and feasibility of the proposed algorithm.