Interference resistance of Adaptive Multiuser Detection in asynchronous Detect and Forward relaying CDMA networks

A. Qureshi, T. Kanakis, P. Rapajic
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引用次数: 1

Abstract

The uplink of an asynchronous Detect and Forward CDMA wireless network interference tolerance is investigated in this paper where relays and base station use Adaptive Multiuser Detection to detect incoming signals. Relays exchange data and channel information with the base station to achieve diversity gains. Due to non orthogonality of random spreading waveforms, Multiple Access Interference occurs, at both the relays and base station. In order to mitigate Multiple Access Interference, Adaptive Multiuser detection is been used by fractionally spaced linear transversal bank of filters. It is shown that Adaptive Multiuser Detection enables asynchronous cooperative communications while it is extremely effective with mitigating channel interference. It is also shown that the BER and Capacity performance of the scheme proposed in this paper is arbitrarily close to non linear MLSE theoretical upper bound results in a channel interference free operation. However, in the presence of channel interference our scheme outperforms the theoretical upper bound approach by nearly 9 dB at a BER of 10−3 and by 17 bits/s/Hz in Capacity at a SNR of 30dB.
异步检测和转发CDMA网络中自适应多用户检测的抗干扰性
本文研究了异步检测和正向CDMA无线网络中中继和基站采用自适应多用户检测来检测入站信号的上行链路干扰容忍问题。中继与基站交换数据和信道信息以获得分集增益。由于随机扩频波形的非正交性,在中继和基站都会产生多址干扰。为了减少多址干扰,采用分数间隔线性横滤波器组进行自适应多用户检测。研究表明,自适应多用户检测在实现异步协同通信的同时,对抑制信道干扰非常有效。在信道无干扰情况下,本文所提出的方案的误码率和容量性能任意接近非线性MLSE理论上界结果。然而,在存在信道干扰的情况下,我们的方案在BER为10−3时比理论上限方法高出近9 dB,在信噪比为30dB时比容量高出17 bits/s/Hz。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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