Recent Advances in Mathematical Research and Computer Science Vol. 3

Abstract

Multi antenna transmission and reception is included in last-generation and future wireless communication standards, such as DVB-T2 or DVB-NGH, to increase bandwidth efficiency and receiver robustness. The primary goal is to combine diversity and spatial multiplexing in order to fully exploit the capacity of multiple-input multiple output (MIMO) channels. For this purpose, full-rate full-diversity (FRFD) space-time codes (STC) such as the Golden code are being investigated. Despite their higher achievable capacity, most of them have a high soft detection complexity, which prevents them from being combined with soft-input decoders in bit-interleaved coded modulation (BICM) schemes. This paper presents a study of a low complexity soft detection algorithm for receiving FRFD space-frequency block codes in BICM orthogonal frequency division multiplexing (OFDM) systems and compares performance using LDPC and Turbo codes. The proposed detector has a low and fixed complexity, avoiding the variable nature of the list sphere decoder (LSD), which is dependent on noise and channel conditions. The proposed detector performs close to the optimal log-maximum a posteriori (MAP) detection in a variety of DVB-T2 broadcasting scenarios, according to complexity and simulation-based performance results.