摘要
提出了一种基于改进抖动符号误差恒模算法(ModifiedDitheredSign-ErrorConstantModulusAlgorithm,MDSE-CMA)的盲多用户检测算法。抖动符号误差恒模算法(DitheredSign-ErrorConstantModulusAlgorithm,DSE-CMA)稳态性能好,但其过量的均方误差使得收敛速度较慢。MDSE-CMA算法通过引入符合正弦概率密度分布的抖动信号来减少均方误差。基于该算法的多用户检测方法与DSE-CMA算法相比,收敛速度加快。仿真证明,提出的方法在码分多址(CodeDivisionMultipleAccess,CDMA)异步多径信道下可有效地抑制多址干扰和克服多径衰落。
Based on modified dithered sign-error constant modulus algorithm （MDSE-CMA）, a multi-user detection algorithm is proposed. The characteristic of steady state of the dithered sign-error constant modulus algorithm （DSE-CMA） is good, but the slow convergence is resulted from its excess mean-squared error （MSE）. A dithering signal with sinusoidal probability density is introduced in MDSE-CMA to reduce the MSE. The multi-user detection based on MDSE-CMA can achieve faster convergence than DSE-CMA. Simulation results show that it can suppress multi-address interference and overcome multi-path fading effectively in code division multiple access （CDMA） and asynchronous multi-path channels.
出处
《信息与电子工程》
2006年第3期221-224,共4页
information and electronic engineering
关键词
码分多址
改进抖动符号误差恒模算法
正弦概率密度
盲多用户检测
code division multiple access
modified dithered sign-error constant modulus
sinusoidal probability density
blind multi-user detection
