Applying iterative demapping and decoding in Mimo system

Abstract

In wireless communications nowadays, the use of MIMO (Multiple Input - Multiple Output) systems can improve the quality of received signals and capacity of channel to transmitting faster with fixed bandwidth by deploying multiple antennas at the transmitter and the receiver. In traditional MIMO receivers, the demapper (or demodulator) does not take advantage of the decoded information at the decoder output for enhancing demodulation performance, indirectly increasing the performance of the decoder. Therefore we propose a MIMO system with the iterative demapping and decoding module in this thesis. By exchanging the information at the outputs of the demodulator and the decoder over several iterations, the original information can be recovered more accurately. Matlab software-based simulation results are going to demonstrate that the proposed iterative demapping and decoding outperforms the conventional one over flat fading channels under different modulation/demodulation schemes. Keywords: MIMO system, iterative demapping and decoding, flat fading channel, AWGN.