多输入多输出系统特征模发射最小化误码率优化功率分配

在多输入多输出系统特征模发射设计中,基于最小化误码率准则优化发射功率分配问题没有简单的闭式解,求解方法有通用优化算法(如内点法)和Q函数契尔诺夫近似功率分配法.前者计算量大且不能理论分析,而后者只能获得近似功率分配解.文中将此约束优化问题的解用W主分支函数表示,将其转化为求解关于W函数的问题,提出了W函数求解法.利用W函数的简单求解算法,所提出方法能获得更精确的优化功率分配解.数值模拟结果也显示,该方法获得了较其他求解方法更低的系统误码率.

The Minimum Bit Error Rate Optimal Power Allocation for Multiple-Input and Multiple-Output Eigenmode Transmit

In multiple-input and multiple-output(MIMO) eigenmode transmit systems,the problem of minimum bit error rate(MBER) based optimal power allocation does not have a simple closed-form solution.There are two existing methods: the general optimization method,i.e.interior point methods,and Q-function Chernoff approximation power allocation.The former has high computation load and is difficult to be theoretically analyzed,the latter only achieves approximative power allocation.The paper expresses the solution to MBER based power allocation by W-function,and transforms the original problems into one on W function.The proposed W-function method can achieve more accurate solution to power allocation.The numerical simulations also show that,the presented W-function power allocation can achieve more lower bit error rate than other methods.