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为了在满足目标频谱效率和目标误码率前提下减小多天线系统的发送功率,针对采用线性接收机的无编码空间复用系统,提出了一种发送天线选择及速率(调制方式)分配、功率分配准则。该准则利用了信道衰落的空间相关矩阵,以各子码流的误码率为约束条件,对发送功率进行优化。仿真结果表明:该准则相比于目前已有的天线集合及调制方式选择准则有2 dB的信噪比增益。给出了逼近该准则性能的简化算法,该算法在很大范围内能达到穷举搜索的性能。
In order to reduce the transmit power of a multi-antenna system while satisfying the target spectrum efficiency and target BER, a transmit antenna selection and rate (modulation scheme) allocation is proposed for a code-less spatial multiplexing system using a linear receiver. Power distribution criteria. The criterion utilizes the spatial correlation matrix of channel fading and optimizes the transmission power with the bit error rate of each sub-stream as the constraint condition. The simulation results show that the proposed scheme has 2 dB signal-to-noise gain compared to the existing antenna set and modulation scheme selection criteria. A simplified algorithm is given to approximate the performance of the criterion, which can achieve the performance of exhaustive search in a wide range.