Performance research of OFDM-IDMA systems based on QC-LDPC
QC-LDPC码在OFDM-IDMA系统中的性能研究

To meet the need of high rate and high reliability for next generation wireless mobile communication system, a new communications scheme is considered from multiple access, and the modulation to error-correcting codes which is based on the QC-LDPC coded OFDM-IDMA system is designed. The performance under different coding rate and different length of frame is analyzed, and the comparison on the proposed QC-LDPC coded OFDM-IDMA system and the system based on convolutional codes over AWGN channel has been made. The simulation result indicates that this new system can get greater coding gain and provide higher quality of communications service, so it is very suitable for high-speed data transmission and also has very far-reaching significance for the future of digital communication systems.