应用VDE的QPSK-CPM扩频系统多用户检测算法  

QPSK-CPM spread system multi-user detection algorithm for VDE

作　　者：吴飞宇 向前 张倩武 张希岩 殷惠惠 Wu Feiyu;Xiang Qian;Zhang Qianwu;Zhang Xiyan;Yin Huihui(School of Communication and Information Engineering,Shanghai University,Shanghai 200444,China;Shanghai Aerospace Electronic Technology Institute,Shanghai 201109,China)

机构地区：[1]上海大学通信与信息工程学院,上海200444 [2]上海航天电子技术研究所,上海201109

出　　处：《电子测量技术》2022年第8期168-172,共5页Electronic Measurement Technology

摘　　要：连续相位调制扩频信号因为扩频序列随机变化,可以适应多用户通信,逐渐被应用到卫星通信中。甚高频数据交换系统随机接入信道采用了QPSK-CPM扩频调制方案,针对QPSK-CPM扩频系统的多用户检测问题,提出一种基于干扰消除检测的新型多用户检测算法,该算法通过对接收用户信息进行串行干扰消除级联一次迭代消除的方法来对多用户信息进行检测,且该算法能够有效消除用户的多普勒频偏及减小用户功率差带来的性能损失。通过对新算法仿真验证,结果表明,新算法比传统干扰消除检测算法具有更好的检测性能,在实时通信船舶数量达到800艘时,8个用户以内的混叠信息解帧率可达90%。Continuous phase modulation spread signal is gradually applied to satellite communication because the spread spectrum sequence changes randomly and can be adapted to multi-user communication. Random access channel of VDE system uses QPSK-CPM spread modulation scheme. A new multiuser detection algorithm based on interference cancellation detection is presented for QPSK-CPM spread spectrum system. The algorithm detects multi-user information by cascaded one-iteration elimination of successive interference cancellation for receiving user information. The algorithm can effectively eliminate the user′s doppler frequency offset and reduce the performance loss caused by user power difference. The simulation results show that the new algorithm has better detection performance than the traditional interference cancellation detection algorithm. When the number of real-time communication ships reaches 800, the deframe rate of overlapping information within 8 users can reach 90%.

关 键 词：连续相位调制扩频 多用户检测 甚高频数据交换系统 卫星通信 串行干扰消除 

分 类 号：TN914[电子电信—通信与信息系统]