Comparison of Three List Detectors in Iterative Decoding and Channel Estimation in MIMO OFDM

Abstract

In this paper, the complexity and the performance of the list parallel interference cancellation (PIC) detection algorithm is compared to the ones of the K-best list sphere detector (LSD) and the increasing radius (IR)-LSD in a multiple- input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system. The detectors are used as a soft MIMO detector to approximate the a posteriori probability (APP) algorithm in an iterative receiver to jointly decode the transmitted bits and to estimate the channel state. According to the results, the list PIC algorithm with a proper initialization gives some performance gain over the K-best LSD and loses only slightly to the IR-LSD. The IR-LSD is found to be the least complex of the algorithms when the number of visited nodes is measured.