Full Duplex Transmission Operation of a 2.45-GHz Asynchronous Spread Spectrum Modem Using a SAW Convolver

Kazuo Tsubouchi; Hiroyuki Nakase; Akihiko Namba; Kazuya Masu

doi:10.1109/58.238098

Full Duplex Transmission Operation of a 2.45-GHz Asynchronous Spread Spectrum Modem Using a SAW Convolver

Kazuo Tsubouchi, Hiroyuki Nakase, Akihiko Namba, Kazuya Masu

ENG - Institute of Engineering Education

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

An asynchronous spread spectrum (SS) modem in the 2.45-GHz band has been implemented using an efficient ZnO-SiO2-Si surface acoustic wave (SAW) convolver. The design of the highly efficient SAW convolver was developed at Tohoku University and commercially available devices have been manufactured by Clarion Co., Japan. The modem can operate under full duplex transmission in the same frequency range of the 2.45-GHz SS band. The SS modem is based on a direct-sequence/code-shift-keying (DS/CSK) method for the modulation. Pseudonoise (PN) codes are chosen from a preferred pair of MSequences of a period 127, and the code rate is 14 MHz. The demodulation is carried out asynchronously, utilizing the coherent correlation characteristics of the SAW convolver. The main interference caused by a transmitted signal in the modem itself is effectively reduced by an RF isolator and the SS process gain. We have experimentally confirmed a sufficient self-jamming rejection capability: a bit error rate of 10”6 is observed at -78.3 dB of a desired to undesired signal ratio using an artificial transmission line.

Original language	English
Pages (from-to)	478-482
Number of pages	5
Journal	IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume	40
Issue number	5
DOIs	https://doi.org/10.1109/58.238098
Publication status	Published - 1993 Sep

ASJC Scopus subject areas

Instrumentation
Acoustics and Ultrasonics
Electrical and Electronic Engineering

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title = "Full Duplex Transmission Operation of a 2.45-GHz Asynchronous Spread Spectrum Modem Using a SAW Convolver",

abstract = "An asynchronous spread spectrum (SS) modem in the 2.45-GHz band has been implemented using an efficient ZnO-SiO2-Si surface acoustic wave (SAW) convolver. The design of the highly efficient SAW convolver was developed at Tohoku University and commercially available devices have been manufactured by Clarion Co., Japan. The modem can operate under full duplex transmission in the same frequency range of the 2.45-GHz SS band. The SS modem is based on a direct-sequence/code-shift-keying (DS/CSK) method for the modulation. Pseudonoise (PN) codes are chosen from a preferred pair of MSequences of a period 127, and the code rate is 14 MHz. The demodulation is carried out asynchronously, utilizing the coherent correlation characteristics of the SAW convolver. The main interference caused by a transmitted signal in the modem itself is effectively reduced by an RF isolator and the SS process gain. We have experimentally confirmed a sufficient self-jamming rejection capability: a bit error rate of 10”6 is observed at -78.3 dB of a desired to undesired signal ratio using an artificial transmission line.",

author = "Kazuo Tsubouchi and Hiroyuki Nakase and Akihiko Namba and Kazuya Masu",

note = "Funding Information: Manuscript received August 10. 1992; revised and accepted January ?, 1993. This work was supported in part by the Ministry of Education, Science, and Culture of Japan by a Grant-in-Aid for Scientific Research (A) 02402034.",

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AU - Nakase, Hiroyuki

AU - Namba, Akihiko

AU - Masu, Kazuya

N1 - Funding Information: Manuscript received August 10. 1992; revised and accepted January ?, 1993. This work was supported in part by the Ministry of Education, Science, and Culture of Japan by a Grant-in-Aid for Scientific Research (A) 02402034.

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N2 - An asynchronous spread spectrum (SS) modem in the 2.45-GHz band has been implemented using an efficient ZnO-SiO2-Si surface acoustic wave (SAW) convolver. The design of the highly efficient SAW convolver was developed at Tohoku University and commercially available devices have been manufactured by Clarion Co., Japan. The modem can operate under full duplex transmission in the same frequency range of the 2.45-GHz SS band. The SS modem is based on a direct-sequence/code-shift-keying (DS/CSK) method for the modulation. Pseudonoise (PN) codes are chosen from a preferred pair of MSequences of a period 127, and the code rate is 14 MHz. The demodulation is carried out asynchronously, utilizing the coherent correlation characteristics of the SAW convolver. The main interference caused by a transmitted signal in the modem itself is effectively reduced by an RF isolator and the SS process gain. We have experimentally confirmed a sufficient self-jamming rejection capability: a bit error rate of 10”6 is observed at -78.3 dB of a desired to undesired signal ratio using an artificial transmission line.

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