Design and Performance of a New OQPSK Coherent Demodulator Using an Advanced Simultaneous Carrier and Bit-Timing Recovery Scheme<cd0215d.gif>Application to Wireless ATM Systems<cd0215d.gif>

Yoichi MATSUMOTO; Masahiro UMEHIRA

Design and Performance of a New OQPSK Coherent Demodulator Using an Advanced Simultaneous Carrier and Bit-Timing Recovery SchemeApplication to Wireless ATM Systems

Yoichi MATSUMOTO, Masahiro UMEHIRA

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This paper presents a new offset-quadrature-phase-shift-keying (OQPSK) coherent demodulation scheme for wireless asynchronous transfer mode (WATM) systems that premise the Ricean fading communication channels (e.g., typically with derectional antennas). The presented demodulator is basically advanced from a simultaneous carrier and bit-timing recovery (SCBR) scheme by newly employing a phase compensated filter and a reverse-modulation scheme for OQPSK. This advancement aims to enhance the carrier phase tracking performance against the phase fluctuation due to the fading and/or the phase rotation caused by the carrier frequency error of the oscillator. Design consideration and performance evaluation of the demodulator are extensively carried out under Ricean fading channels typical of the WATM systems as well as additive white Gaussian noise (AWGN) channels. The evaluation ressults show that the advanced SCBR (ASCBR) scheme achieves a bit-error-rate/cell-error-rate (BER/CER) performance close to ideal coherent detection with a considerably short preamble, e.g., 8 symbols. Specifically, compared with differential detection (evaluated for QPSK with the hard-wired clock), the new coherent demodulator achieves a significant required E_b/N_o improvement, which becomes larger as the fading condition degrades. This paper concludes that the ASCBR scheme is a strong candidate for the Ricean-fading-premise WATM systems.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E80-A No.7 pp.1175-1182

Publication Date: 1997/07/25

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Type of Manuscript: Special Section PAPER (Special Section on Multi-dimensional Mobile Information Network)

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Yoichi MATSUMOTO, Masahiro UMEHIRA, "Design and Performance of a New OQPSK Coherent Demodulator Using an Advanced Simultaneous Carrier and Bit-Timing Recovery SchemeApplication to Wireless ATM Systems" in IEICE TRANSACTIONS on Fundamentals, vol. E80-A, no. 7, pp. 1175-1182, July 1997, doi: .
Abstract: This paper presents a new offset-quadrature-phase-shift-keying (OQPSK) coherent demodulation scheme for wireless asynchronous transfer mode (WATM) systems that premise the Ricean fading communication channels (e.g., typically with derectional antennas). The presented demodulator is basically advanced from a simultaneous carrier and bit-timing recovery (SCBR) scheme by newly employing a phase compensated filter and a reverse-modulation scheme for OQPSK. This advancement aims to enhance the carrier phase tracking performance against the phase fluctuation due to the fading and/or the phase rotation caused by the carrier frequency error of the oscillator. Design consideration and performance evaluation of the demodulator are extensively carried out under Ricean fading channels typical of the WATM systems as well as additive white Gaussian noise (AWGN) channels. The evaluation ressults show that the advanced SCBR (ASCBR) scheme achieves a bit-error-rate/cell-error-rate (BER/CER) performance close to ideal coherent detection with a considerably short preamble, e.g., 8 symbols. Specifically, compared with differential detection (evaluated for QPSK with the hard-wired clock), the new coherent demodulator achieves a significant required E_b/N_o improvement, which becomes larger as the fading condition degrades. This paper concludes that the ASCBR scheme is a strong candidate for the Ricean-fading-premise WATM systems.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e80-a_7_1175/_p

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@ARTICLE{e80-a_7_1175,
author={Yoichi MATSUMOTO, Masahiro UMEHIRA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Design and Performance of a New OQPSK Coherent Demodulator Using an Advanced Simultaneous Carrier and Bit-Timing Recovery SchemeApplication to Wireless ATM Systems},
year={1997},
volume={E80-A},
number={7},
pages={1175-1182},
abstract={This paper presents a new offset-quadrature-phase-shift-keying (OQPSK) coherent demodulation scheme for wireless asynchronous transfer mode (WATM) systems that premise the Ricean fading communication channels (e.g., typically with derectional antennas). The presented demodulator is basically advanced from a simultaneous carrier and bit-timing recovery (SCBR) scheme by newly employing a phase compensated filter and a reverse-modulation scheme for OQPSK. This advancement aims to enhance the carrier phase tracking performance against the phase fluctuation due to the fading and/or the phase rotation caused by the carrier frequency error of the oscillator. Design consideration and performance evaluation of the demodulator are extensively carried out under Ricean fading channels typical of the WATM systems as well as additive white Gaussian noise (AWGN) channels. The evaluation ressults show that the advanced SCBR (ASCBR) scheme achieves a bit-error-rate/cell-error-rate (BER/CER) performance close to ideal coherent detection with a considerably short preamble, e.g., 8 symbols. Specifically, compared with differential detection (evaluated for QPSK with the hard-wired clock), the new coherent demodulator achieves a significant required E_b/N_o improvement, which becomes larger as the fading condition degrades. This paper concludes that the ASCBR scheme is a strong candidate for the Ricean-fading-premise WATM systems.},
keywords={},
doi={},
ISSN={},
month={July},}

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TY - JOUR
TI - Design and Performance of a New OQPSK Coherent Demodulator Using an Advanced Simultaneous Carrier and Bit-Timing Recovery SchemeApplication to Wireless ATM Systems
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1175
EP - 1182
AU - Yoichi MATSUMOTO
AU - Masahiro UMEHIRA
PY - 1997
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E80-A
IS - 7
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - July 1997
AB - This paper presents a new offset-quadrature-phase-shift-keying (OQPSK) coherent demodulation scheme for wireless asynchronous transfer mode (WATM) systems that premise the Ricean fading communication channels (e.g., typically with derectional antennas). The presented demodulator is basically advanced from a simultaneous carrier and bit-timing recovery (SCBR) scheme by newly employing a phase compensated filter and a reverse-modulation scheme for OQPSK. This advancement aims to enhance the carrier phase tracking performance against the phase fluctuation due to the fading and/or the phase rotation caused by the carrier frequency error of the oscillator. Design consideration and performance evaluation of the demodulator are extensively carried out under Ricean fading channels typical of the WATM systems as well as additive white Gaussian noise (AWGN) channels. The evaluation ressults show that the advanced SCBR (ASCBR) scheme achieves a bit-error-rate/cell-error-rate (BER/CER) performance close to ideal coherent detection with a considerably short preamble, e.g., 8 symbols. Specifically, compared with differential detection (evaluated for QPSK with the hard-wired clock), the new coherent demodulator achieves a significant required E_b/N_o improvement, which becomes larger as the fading condition degrades. This paper concludes that the ASCBR scheme is a strong candidate for the Ricean-fading-premise WATM systems.
ER -