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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.

研究了适用于同频干扰的多径衰落信道的接收系统。首先，我们研究了一种同时配备M扇区定向天线和自适应均衡器的接收系统，以减轻多径传播和同频干扰的影响。通过使用定向天线，该接收系统可以分离出期望的信号和不期望的信号，如延迟时间较长的多径信号和同频干扰。它接受可用最大似然序列估计器(MLSE)均衡的多径信号，并抑制延迟时间较长的多径信号和同频干扰。基于计算机仿真结果，验证了该系统在瑞利分布的多径信道中具有较强的抗较长时延信号和同信道干扰的能力；其次，实现了一种新的基于最大似然估计的同信道干扰对消器，与基于判决反馈均衡器的同信道干扰对消器相比，具有更好的误码率性能，并与格状编码调制相结合，提高了对消性能。最后，对提出的网格编码共信道干扰对消器(TCC)进行了实验室实验。结果表明，与传统的同信道干扰对消器相比，TCC显著提高了误码率性能，特别是在微蜂窝系统中常见的Nakagami-莱斯衰落信道下，但代价是计算复杂度略有增加。