Full-Duplex Asynchronous Spread Spectrum Modem Using a SAW Convolver for 2.4-GHz Wireless LAN (Special Issue on Personal, Indoor and Mobile Radio Communications)
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概要
- 論文の詳細を見る
An asynchronous spread spectrum (SS) modem for 2.4-GHz wireless LAN has been implemented using an efficient ZnO-SiO_2-Si surface acoustic wave (SAW) convolver. The design of the highly efficient SAW convolver was developed at Tohoku University and commercially manufactured by Clarion Co., Japan. The modem can operate under full-duplex transmission in the same frequency range of the 2.4-GHz SS band. The SS modem is based on a direct-sequence/code-shift-keying (DS/CSK) method for the modulation. Pseudo-noise (PN) codes are chosen from a preferred pair of 127-chip m-sequences and the code rate is 14 MHz. The asynchronous demodulation is simply realized utilizing the coherent correlation characteristics of the SAW convolver. Under fullduplex transmission, the self-jamming caused by a transmitted signal in the modem itself is effectively reduced by an RF isolator and the SS processing gain. The implemented modem has been tested using a coaxial cable with attenuator. A bit error rate of ^<-6> under full-duplex transmission is observed at -78.3 dB of a desired to undesired signal ratio. The effective range is estimated on the basis of two-path propagation model. From self-jamming rejection of -78.3 dB, the effective range under real-time full-duplex is estimated to be about 200 m.
- 社団法人電子情報通信学会の論文
- 1994-07-25
著者
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NAKASE Hiroyuki
Research Institute of Electrical Communication Tohoku University
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Masu K
Research Institute Of Electrical Communication Tohoku University
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Masu Kazuya
Integrated Research Institute
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Masu Kazuya
Research Institute Of Electrical Communication Tohoku University
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Nakase H
Tohoku Univ. Sendai Jpn
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Nakase Hiroyuki
Research Institute Of Electrical Communicaiton Tohoku University
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TSUBOUCHI Kazuo
Research Institute of Electrical Communication, Tohoku University
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Namba Akihiko
Research Institute of Electrical Communication, Tohoku University
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Masu Kazuya
東工大
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Togura Kenji
The Research Institute Of Electrical Communication Tohoku University Presently The Technology Resear
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Namba Akihiko
Research Institute Of Electrical Communication Tohoku University:matsushita Electric Industries Co.
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Tsubouchi K
Research Institute Of Electrical Communication Tohoku University
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Tsubouchi Kazuo
Research Institute Of Electrical Communicaiton Tohoku University
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Tsubouchi K
Tohoku University
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TSUBOUCHI Kazuo
Research Institute of Electric Communication (RIEC), Tohoku University
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