Hybrid Precoding Design in Millimeter Wave Single-user Large-scale Multiple-Input Multiple-Output System
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摘要: 在毫米波MIMO通信系统中，针对如何提升频谱效率的问题，该文提出一种有效的混合预编码双层交替迭代算法。外层交替使用分解的方法解耦收发端，减少1次计算中所求变量的个数；而内层交替只对接收或者发送端进行，利用模拟域矩阵按列分解，数字域矩阵按行分解，将频谱效率表达式化简为一系列子问题。考虑到模拟域矩阵中单个元素对函数的影响和模为1的限制，对列元素采取逐个优化的方案，并对每一次的解加上约束，使解始终处在收敛域内。实验结果表明，所提交替优化解决方案可以获得更好的性能且有着较低的复杂度。Abstract: In the millimeter wave Multiple Input Multiple Output (MIMO) system, in order to improve the spectral efficiency, an effective hybrid precoding double-layer alternating iterative algorithm is proposed. The alternation of the outer layer uses the decomposition method to decouple the transmitter and receiver, which reduces the number of solved variables in one calculation. The alternation of the inner layer is only used for the receiver or transmitter. The analog domain matrix is decomposed by columns and the digital domain matrix is decomposed by rows, which reduces the spectrum efficiency expression into a series of sub-problems. Considering the influence of single element in the analog domain matrix on the function and the limitation of amplitude 1, the column elements are optimized one by one, and each solution is constrained to make solution be always in the convergence domain. Experimental results show that the proposed alternative optimization solution can obtain better performance and low complexity.
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