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在分析空时编码技术和多载波CDMA技术原理的基础上,采用turbo编码作为信道编码以及优化的复小波包作为多载波调制,提出一种基于复小波包和turbo码的空时分组编码的MCCDMA系统,研究了其在瑞利衰落信道下的误码率性能.该系统能充分利用空时分组编码的发送分集和turbo码的良好抗信道衰落能力显著提高系统性能,而且还能利用优化复小波包的优良特性避免通常MCCDMA系统由于插入循环前缀(CP)所带来频谱效率的降低.仿真结果表明,基于复小波包的空时分组编码的MCCDMA系统要好于空时分组编码的通常MCCDMA(STBCMCCDMA)系统,略好于采用CP的STBCMCCDMA系统;级联turbo码的空时编码技术的应用进一步增强了系统抗衰落信道下的各种干扰能力.
Based on analyzing the principle of space-time coding and multi-carrier CDMA, turbo coding is used as channel coding and optimized complex wavelet packet as multi-carrier modulation. A space-time block coded MCCDMA based on complex wavelet packet and turbo code System, and studies its bit error rate performance under Rayleigh fading channel.The system can make full use of space-time block coding transmit diversity and turbo code good anti-channel fading ability significantly improve system performance, but also can use the optimized complex wavelet The excellent feature of the packet avoids the spectral efficiency reduction caused by the insertion of a cyclic prefix (CP) in a typical MCCDMA system. The simulation results show that the MCCDMA system based on space-time block coding of complex wavelet packets is better than the conventional MCCDMA (STBCMCCDMA ) System, which is slightly better than the STBCMCCDMA system using CP. The application of space-time coding technology in cascaded turbo codes further enhances the various interference abilities under the anti-fading channel of the system.