基于空间调制的天线选择和能效优化算法

摘要

空间调制是一种新型的具有低复杂度的多输入多输出通信技术，并成为近年来的研究热点。为了进一步提升空间调制的误比特率性能，该文研究了空间调制中的发射天线选择问题，提出了一种基于信道列向量夹角和范数的低复杂度的发射天线选择算法。该算法能够有效减少矩阵运算，并且不需要考虑差异向量，因此具有极低的计算复杂度，且适用于发射天线数目明显高于接收天线数目的情况。同时，加入了功率修正因子，有效地控制发射信号功率，极大程度地提升了能量效率。仿真结果表明，该算法能够在限制发射功率的前提下，以极低的计算复杂度逼近最优算法的性能。%Spatial modulation (SM), which is proposed recently, is a low-complexity multiple-input multiple-output (MIMO) transmission technique. This paper considers the transmit antenna selection for spatial modulation to improve the performance in terms of bit error rate (BER). A low-complexity transmit antenna selection approach by using low-complexity angle and norm of column vectors of the channel matrix is proposed. Furthermore, this paper introduces a power correction factor which effectively constrains the transmission power. Simulation results show that the proposed algorithm can achieve nearly optimal performance with lower substantial computational complexity and limited transmission power.