使用差分相位调制解决盲自适应恒模算法相位旋转问题的研究  

The Study on using Differential Phase Modulation to Solve Phase Offset Problem of Blind Adaptive Algorithm CMA

作　　者：孔媛媛[1] 酆广增[1] 王欣[1] 

机构地区：[1]南京邮电大学研究生部,江苏南京210003

出　　处：《信号处理》2008年第2期303-307,共5页Journal of Signal Processing

基　　金：国家自然科学基金(60472104);江苏省高校自然科学研究计划项目(04KJB510094);江苏省高校研究生创新计划(xm04-32)

摘　　要：恒模算法CMA是一种重要的盲均衡自适应算法,但存在相位旋转问题,本文研究把差分相位调制应用到CMA盲均衡系统中,解决恒模算法的相位旋转问题。通过跟MCMA算法比较,证明了这种方法可以补偿信道任意角度的相位失真,能更有效地解决恒模算法的相位旋转问题,并且能够抵抗一定的多普勒频移。仿真结果表明这种方法降低了CMA盲均衡系统的误码率,提高了系统的性能。CMA is an important equalization algorithm, but it has a problem of phase offset. This paper investigates the structure of combining Differential Phase Modulation with CMA equalization. By comparing with MCMA, it shows that this method can overcome the arbitrary phase distortion and some Doppler frequency offset caused by channel and can solve the phase offset problem of CMA more efficiently. The simulation results show that this method is efficient to reduce the SER of the system and can enhance the system performance at the same time.

关 键 词：恒模算法 差分相位调制 相位旋转 相位失真 多普勒频移 

分 类 号：TN946.2[电子电信—信号与信息处理] TN929.5[电子电信—信息与通信工程]