In this letter, the average mutual information (AMI) of generalized quadrature spatial modulation (GQSM) is first derived for continuous-input continuous-output channels. Our mathematical analysis shows that the calculation error induced by Monte Carlo integration increases exponentially with the signal-to-noise ratio. This nature of GQSM is resolved by deriving a closed-form expression. The derived AMI is compared with other related SM schemes and evaluated for different antenna activation patterns. Our results show that an equiprobable antenna selection method slightly decreases AMI of symbols, while the method significantly improves AMI in total.

翻译：本文首先针对连续输入连续输出信道，推导了广义正交空间调制（GQSM）的平均互信息（AMI）。数学分析表明，蒙特卡洛积分引入的计算误差随信噪比呈指数增长。通过推导闭式表达式解决了GQSM的这一特性。将推导的AMI与其他相关空间调制方案进行了比较，并针对不同天线激活模式进行了评估。结果表明，等概率天线选择方法虽使符号的AMI略有下降，但显著提升了总体的AMI。