Turbo-CPM系统在窄带低信噪比条件下的性能研究  

Performance study of Turbo-CPM systems in a narrow-band and low SNR environment

作　　者：赵旦峰[1] 薛睿[1] 肖春丽[2] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,哈尔滨150001 [2]中国移动通信集团黑龙江有限公司,哈尔滨150040

出　　处：《高技术通讯》2010年第7期685-689,共5页Chinese High Technology Letters

基　　金：'十一.五'国防预研基金(4010607010102);中央高校基本科研业务费专项资金(HEUCF100814)资助项目

摘　　要：为克服窄带低信噪比系统传统接收机中解调器与译码器之间缺少信息共享的弊端,将迭代检测原理应用到连续相位调制(Turbo-CPM)系统中,提出了一种基于软输入软输出(SISO)算法的迭代检测方法,探讨了Turbo分量码结构、交织深度、迭代次数和连续相位调制(CPM)指数等主要参数对系统性能的影响,为实际应用中系统参数的选择提供了参考依据。加性高斯白噪声(AWGN)信道下的仿真结果表明:在窄带低信噪比特定条件下,基于Turbo码的八进制部分响应CPM(8M2RC)系统能够有效地改善系统的收敛性,降低地板效应出现的概率,提高系统的误比特率性能,同时兼顾了信息传输的有效性,提高了频带利用率。In order to solve the problem of shortage of information sharing between the demodulator and the decoder in a traditional receiver of a narrow-band and low signal to noise ratio （SNR） communication system, the paper proposes an iterative detection method based on the SISO algorithm. Then the effect of the Turbo code structure, interleaver length, itemtive number and the continuous phase modulation （CPM） index on the performance of a Turbo-CPM system is studied, to provide the reference basis for practical application. The simulation results in the additive white Gaussian noise （AWGN） channel show that the 8-ary partial response CPM （8M2RC） system based on the turbo code can improve the iterative convergence, and reduce the error-floor and improve the bit error rate （BER） performance effectively under the special condition of narrow-band and low SNR. Meanwhile, the system can also improve the band efficiency in the aspect of effectiveness of information transmission.

关 键 词：Turbo码 连续相位调制(CPM) 窄带 低信噪比(SNR) 迭代检测 

分 类 号：TN911.4[电子电信—通信与信息系统]