CDMA系统中多用户检测算法的研究

Multiuser detection algorithm in CDMA system

在DS-CDMA系统中,多用户检测技术是抗多址干扰和“远近效应”的有效方法,因此也成为了第三代移动通信的关键技术之一。文中通过仿真比较分析了传统检测器、最优检测器、解相关检测器、MMSE检测器、串行干扰抵消检测器、并行干扰抵消检测器和解相关判决反馈检测器等经典多用户检测器的误码率、渐近多用户有效性和抗远近能力,并从计算复杂度和所需的假定知识两个方面讨论了这些检测器的实现复杂度。

Multi-user detection （MUD） is an effective method suppressing MAI and ＂near-far effects＂ for a DS-CDMA system, so it is one of the key technology in 3G mobile communication system. The performances of BER, asymptotic multiuser efficiency and near-far resistance of some typical conventional multi-user detectors, maximum likelihood sequence estimator detector, decorrelating detector, MMSE detector, successive interference cancellation detector（SIC）, parallel interference cancellation detector（PIC） and decorrelating decision feedback detector are compared and analyzed through MAT- LAB simulation, the received signal and system parameters that have to be estimated or known by the receiver and the computational complexity of these detectors are also discussed.