EMI Suppression Technique for ISM-Band WLANs Using Multicode Transmission and EMI Observation Channel(Special Issue on Recent Progress in Electromagnetic Compatibility Technology)
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概要
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It is well known that the electromagnetic interference(EMI)radiated from industrial, scientific and medical(ISM)apparatus seriously degrades the performance of wireless communication systems. In this paper, an ISM-band wireless local area network(WLAN)which employs a direct sequencespread spectrum (DS-SS)system is designed to be sufficiently robust and reliable to operate in the presence of this EMI.To satisfy this goal, a technique to suppress EMI in the DS-SS system using a multicode transmission and an EMI observation channel is proposed. In the study, the EMI radiated from switching-type microwave ovens(MWO interference)which are ISM apparatus is concerned, and for a tractable investigation, a statistical model to represent MWO interference based on experimental measurement results is employed. As well known that MWO interference exhibits a bursty impulsive characteristic in time, a technique to transmit multiple long spreading codes(multicode transmission)is introduced for the DS-SS system to overcome the burstness of the interference. Moreover, inspired by the broadband in frequency of MWO interference, a technique to estimate the channel MWO interference by means of observing its levels in an adjacent channel is proposed, and this technique is applied to construct a multicode DS-SS receiver which can suppress the channel MWO interference. An evaluation of the bit error rate performance of the proposed multicode DS-SS system is conducted by computer simulation, and the numerical results demonstrate that the proposed DS-SS system can operate effectively even in the presence of MWO interference.
- 社団法人電子情報通信学会の論文
- 2000-03-25
著者
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Miyamoto Shouichi
Ulsi Laboratory Mitsubishi Electric Corporation
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Morinaga Norihiko
The Faculty Of Engineering Osaka University
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Morinaga Norihiko
The Graduate School Of Engineering Osaka University
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Morinaga N
Department Of Information Technology Faculty Of Infrastructural Technologies Hiroshima International
-
UNAWONG Sakda
the Graduate School of Engineering, Osaka University
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MIYAMOTO Shinichi
the Graduate School of Engineering, Osaka University
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Unawong Sakda
The Graduate School Of Engineering Osaka University
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