Solving the ZF receiver equation for MIMO systems under variable channel conditions using the block Fourier algorithm

Abstract

The ZF (Zero Forcing) algorithm is one of the best linear receivers for DS-CDMA (Direct Sequence-Code Division Multiple Access). However, for the case of MIMO/BLAST (Multiple Input, Multiple Output / Bell Laboratories Layered Space Time) with high loading, the perceived complexity of the ZF receiver is taken as too big, and thus other types of receivers are employed, yielding worse results. In this paper, we investigate the complexity of the solution to the MIMO ZF receiver's equations using Block-Fourier algorithms, for both steady and unsteady channel situations.