Low Computational Design of Large Transmit Array MIMO Using Flexible Subarray Grouping

摘要

This paper presents an improved version of low computational block diagonalization for Multiple Input Multiple Output (MIMO) multiuser telecommunication system equipped with a large array in transmitter side. While uniform subarray structure simply based on antenna index is adopted in previous work, this study investigates the effective flexible subarray grouping based on channel condition between antenna elements and receivers. In subarray grouping of large transmit array, all antenna elements are first sorted in the descent order of a certain metric, and then, they are grouped into subarrays according to a certain rule (in this paper, two metrics and two rules are considered). Through computer simulations, it is shown that this scheme is not effective for uniform subarray, but in nonuiform construction, it could achieve performance improvement under certain conditions.