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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.

研究了适用于多径衰落信道的同频干扰接收系统。首先，我们研究了一个接收系统配备了一个M扇区定向天线和一个自适应均衡器，以减轻由于多径传播和同频干扰的影响。通过使用定向天线，该接收系统可以将有用信号与不需要的信号（如具有较长延迟时间的多径信号和同频干扰）分离。该算法接收可通过最大似然序列估计器（MLSE）均衡的多径信号，同时抑制延迟时间较长的多径信号和同频干扰。仿真结果表明，该系统在瑞利分布的多径信道中具有较强的抗长时延信号和抗同频干扰的能力。为了提高接收机的同频干扰消除性能，我们利用DSP实现了一种新的同频干扰消除器，它基于最大似然估计，与同频干扰消除器相比，具有上级误码性能。基于判决反馈均衡器的同频干扰消除器，并结合网格编码调制提高了其消除性能，最后对所研制的同时采用MLSE和网格编码调制的同频干扰消除器--网格编码同频干扰消除器（TCC）进行了实验室实验。结果表明，TCC显着改善了误比特率性能，特别是对于Nakagami-Rice衰落信道，通常遇到的微蜂窝系统，在一个适度增加的计算复杂度为代价的传统的同信道干扰消除器。