首页 | 本学科首页   官方微博 | 高级检索  
     


Analysis of an Approximate Decorrelating Detector
Authors:Mandayam  Narayan B.  Verdú   Sergio
Affiliation:(1) Winlab, Department of ECE, Rutgers University, Piscataway, NJ, 08855-0909;(2) Department of Electrical Engineering, Princeton University, Princeton, NJ, 08544
Abstract:
In this paper an approximate decorrelating detector is analyzed on the basis of a first order approximation to the inverse crosscorrelation matrix of signature waveforms. The approximation is fairly accurate for systems with low crosscorrelations and is exact in the two-user synchronous case. We present an exact as well as approximate analysis of the bit-error-rate performance of this detector on a channel that is subject to flat fading, and also specifically for the case of random signature waveforms. The detector outperforms the conventional matched filter receiver in terms of BER. The approximate decorrelator (while not being near-far resistant like the decorrelating detector) is fairly robust to imperfections in power control. Power trade-off regions are identified which characterize the significant advantage that the approximate decorrelator provides over the matched filter receiver. The reduced complexity of the approximate decorrelator and performance gains over the conventional matched filter makes it a viable alternative for implementation in practical CDMA systems, in particular in those where the signature waveforms span many symbol intervals.
Keywords:CDMA  multiuser detection  decorrelating detector  linear demodulation  co-channel interference.
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号