上行链路抗远近效应的半盲MUD

A Novel Near-far Resistant Semi-blind Adaptive Multiuser Detector

本文提出了一种新的用于CDMA系统上行链路,且具有较强抗远近效应性能的半盲自适应多用户检测器(MUD)。借鉴串行干扰抵消(SIC)的思想,该方法利用一种新的自适应幅度估计器进行小区内用户信号的幅度估计,然后使用一种基于快速子空间跟踪算法的盲MUD,按照幅度从大到小的顺序依次检测出小区内的用户。这样,既通过盲方法抑制了来自小区外的干扰,又充分利用小区内用户的信息,提高了检测性能,特别是对弱信号的检测性能,具有较强的抗远近效应的性能。

A novel near-far resistant semi-blind adaptive multiuser detector (MUD) is presented for the uplink in the CDMA system. Taking advantage of the idea behind successive interference cancellation (SIC), a new adaptive amplitude estimator is used to estimate the amplitudes of all the users within the cell, followed by the ordinal detections of them in term of the descending amplitudes by using the blind MUD based on the FAST algorithm. Thus, the inter-cell interference is suppressed by the blind technique. Moreover, the detection performance, especially for the weaker users, is improved by the full use of all the known users' information within the cell, accordingly obtaining the excellent near-far resistant performance.