通信技术
通信技術
통신기술
COMMUNICATIONS TECHNOLOGY
2013年
4期
62-64
,共3页
直接序列码分多址%盲多用户检测%恒模算法
直接序列碼分多阯%盲多用戶檢測%恆模算法
직접서렬마분다지%맹다용호검측%항모산법
DS/CDMA%blind multi-user detection%constant modulus algorithm
恒模算法(CMA)是盲多用户检测中利用高阶统计量作为代价函数的自适应算法,但其步长恒定,不能随通信信道实际情况变化.在CMA和线性约束恒模算法(LCCMA)的基础上,将自适应步长引入到CMA中,得到自适应步长恒模算法(ASCMA),该算法能够根据通信信道情况自适应调节滤波器的步长,从而改善CMA算法的性能.通过MATLAB仿真表明,在白噪声通信信道环境中,ASCMA与LCCM相比,其输出信干比(SIR)、收敛速度等性能都有了较大的提高.
恆模算法(CMA)是盲多用戶檢測中利用高階統計量作為代價函數的自適應算法,但其步長恆定,不能隨通信信道實際情況變化.在CMA和線性約束恆模算法(LCCMA)的基礎上,將自適應步長引入到CMA中,得到自適應步長恆模算法(ASCMA),該算法能夠根據通信信道情況自適應調節濾波器的步長,從而改善CMA算法的性能.通過MATLAB倣真錶明,在白譟聲通信信道環境中,ASCMA與LCCM相比,其輸齣信榦比(SIR)、收斂速度等性能都有瞭較大的提高.
항모산법(CMA)시맹다용호검측중이용고계통계량작위대개함수적자괄응산법,단기보장항정,불능수통신신도실제정황변화.재CMA화선성약속항모산법(LCCMA)적기출상,장자괄응보장인입도CMA중,득도자괄응보장항모산법(ASCMA),해산법능구근거통신신도정황자괄응조절려파기적보장,종이개선CMA산법적성능.통과MATLAB방진표명,재백조성통신신도배경중,ASCMA여LCCM상비,기수출신간비(SIR)、수렴속도등성능도유료교대적제고.
@@@@CMA (constant modulus algorithm) algorithm is an adaptive algorithm with higher-order statistics as cost function in the bind multi-user detection, and however for its fixed step-size, could not change according to the actual situation of the channel. Based on CMA and linear constraint constant modulus, the adaptive step-size is introduced into CMA, thus acquiring. ASCMA could optimally adapt the step size of blind multi-user detector in accordance with the actual channel condition. Simulations with Matlab show that ASCMA, as compared with LCCM, is of much better performance in SIR and converge speed, in AWGN channels.
