EXPERIMENTAL RESEARCH ON INTELLIGENT RECEIVING SYSTEM SUITABLE FOR HIGH-SPEED WIRELESS LOCAL AREA NETWORK

适合高速无线局域网的智能接收系统实验研究

基本信息

批准号：
06555107
负责人：
YOSHIDA Susumu
金额：
$ 1.54万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555107/
关键词：
Wireless LAN Fading Co-channel interference Multipath Interference canceller Signal processing Digital signal processor

项目摘要

Receiving systems suitable for multipath fading channels with co-channel interference were studied. First, we studied a receiving system equipped with both an M-sectored derectional antenna and an adaptive equalizer to mitigate the influence due to multipath propagation and co-channel interference. By using directional antennas, this receiving system can separate desirable signals from undesirable signals, such as multipath signal with longer delay time and co-channel interference. It accepts multipath signals which can be equalized by maximum likelihood sequence estimator (MLSE) , and rejects both multipath signals with longer delay time and co-channel interference. Based on computer simulation results, the proposed system was confirmed to have the capability of combating with a longer delayd signal and co-channel interference in Rayleigh-distributed multipath channels.Second, we implemented a new co-channel interference canceller to enhance the co-channel interference cancelling performance of the proposed receiver using DSP.It is based on MLSE and has superior BER performance compared with co-channel interference cancellers based on decision feedback equalizer, and its cancelling performance is improved by combining with trellis-coded modulation.Finally, we conducted laboratory experiments of the developed canceller, trellis-coded co-channel interference canceller (TCC), which utilizes both MLSE and trellis-coded modulation. It was shown that TCC significantly improved the bit error rate performance over a conventional co-channel interference canceller especially for Nakagami-Rice fading channels, typically encountered in a microcellular system, at the cost of a moderately increased computational complexity.

研究了适用于具有同信道干扰的多径衰落信道的接收系统。首先，我们研究了同时配备M扇形偏向天线和自适应均衡器的接收系统，以减轻多径传播和同信道干扰的影响。通过使用定向天线，该接收系统可以将所需信号与不需要的信号分离，例如具有较长延迟时间的多径信号和同信道干扰。它接受可以通过最大似然序列估计器(MLSE)均衡的多径信号，并拒绝具有较长延迟时间和同信道干扰的多径信号。基于计算机仿真结果，证实所提出的系统具有抵抗瑞利分布式多径信道中较长延迟信号和同信道干扰的能力。其次，我们实现了一种新的同信道干扰消除器来增强同信道干扰。所提出的接收器使用DSP的信道干扰消除性能。它基于MLSE，与基于判决反馈均衡器的同信道干扰消除器相比，具有优越的BER性能，并且通过与最后，我们对所开发的消除器——网格编码同信道干扰消除器（TCC）进行了实验室实验，它同时利用了MLSE和网格编码调制。结果表明，与传统的同信道干扰消除器相比，TCC 显着提高了误码率性能，特别是对于微蜂窝系统中通常遇到的 Nakagami-Rice 衰落信道，但代价是计算复杂度适度增加。