DS-CDMA系统中两种盲多用户检测恒模算法的比较

研究了线性约束恒模算法（LCCMA,linear constrained constant modulus algorithm）和线性约束差分恒模算法（LCDCMA,linear constrained differential constant modulus algorithm）,并仿真试验了在期望用户信号幅度不同情况下这两种算法的收敛性和稳定性,仿真结果与理论推导相吻合。试验表明：LCCM算法只有在满足信号幅度是A≥1/3的情况下才能完全消除多址干扰（MAI,multiac-cess interference）,而LCDCM算法不论信号幅度是在≥1/3还是在〈1/√3条件下,都能够正确收敛到目标用户,具有很好的收敛性和稳定性,优越于LCCM算法。

Comparison of Two Blind Multiuser Detection Algorithms in DS-CDMA System

Linear constrained constant modulus algorithm （LCCMA） and linear constrained differential constant modulus algorithm（LCDCMA） were studied in this paper. Using different signal amplitudes to simulate their convergence and stability, its results tally with the theory analysis. Simulation results show that the LCCMA can remove multiple-access interference completely if and only if the desired user＇s amplitude is no less than the critical value 1/√3,however,the LCDCMA in all test situations can converge to desired user. It is superior to LCCMA in fast convergence and robustness.