Performance analysis of LDPC codes in the DM-OFDM system

Low density parity check code (LDPC) has constructed a flexible, low decoding complexity and performance close to Shannon limit benefits. In this paper, the method of BICM with LDPC code as its component code is applied to the Differential Modulation OFDM (DM-OFDM) system, and the comparison with the traditional method of BICM with convolutional codes (CC-BICM) is analyzed. The simulation results show that, in the DM-OFDM system the performance of LDPC codes is better than the convolutional codes. And as a result of the use of non-coherent detection which does not require channel estimation, the complexity of system is greatly reduced.