A new joint iterative detecting algorithm in high-order modulation MIMO systems

Abstract

This article imports an improved multistage sphere decoding (IMSD) algorithm into the MMSE-PIC iterative structure and proposes a new joint iterative detecting structure in high order modulation MIMO systems. The IMSD algorithm is designed against the higher-order modulation system with lower complexity and near SD performance. The new structure replaces the MMSE liner detector with the IMSD detector in the first round iteration of original MMSE-PIC structure, which has better performance and lower sensitivity towards channel correlation.