Soft Decision Viterbi Decoding and Self-Interference Cancellation for High Speed Radio Communication by Parallel Combinatory CDMA

Osamu KATO; Masatoshi WATANABE; Eiji KATSURA; Koichi HOMMA

Soft Decision Viterbi Decoding and Self-Interference Cancellation for High Speed Radio Communication by Parallel Combinatory CDMA

Osamu KATO, Masatoshi WATANABE, Eiji KATSURA, Koichi HOMMA

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We propose a soft decision Viterbi decoding scheme and a self-interference cancellation method applicable to a Parallel Combinatory CDMA (PC-CDMA) system. In this decoding scheme, branch metric is calculated for every bit by weighting the output levels of the PC-CDMA correlators so as to enable an effective soft decision capability to the system. The effectivity of this scheme is then further enhanced by the use of a simple pseudo-random bit interleaving scheme. Moreover, to increase the capacity of the PC-CDMA system, we propose a simple self-interference cancellation method for self-induced cross-correlation arising from the multipath environment. This further enhances the efficacy of the decoding scheme because the false contributions of the self-induced cross-correlation component are removed from the branch metric prior to soft decision Viterbi decoding. Finally, we simulated a possible PC-CDMA system with a user data rate of 1.92Mbps, transmitting it at a chip rate of 3.84Mcps and at 7.68Mcps under a multipath-Rayleigh fading interference environment. For a chip rate of 7.68Mcps, BER after Viterbi decoding is less than 3.2e-7 even without the use of interference cancellation. For a chip rate of 3.84Mcps, BER after Viterbi decoding with interference cancellation is 1.0e-4.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E80-A No.7 pp.1233-1240

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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Osamu KATO, Masatoshi WATANABE, Eiji KATSURA, Koichi HOMMA, "Soft Decision Viterbi Decoding and Self-Interference Cancellation for High Speed Radio Communication by Parallel Combinatory CDMA" in IEICE TRANSACTIONS on Fundamentals, vol. E80-A, no. 7, pp. 1233-1240, July 1997, doi: .
Abstract: We propose a soft decision Viterbi decoding scheme and a self-interference cancellation method applicable to a Parallel Combinatory CDMA (PC-CDMA) system. In this decoding scheme, branch metric is calculated for every bit by weighting the output levels of the PC-CDMA correlators so as to enable an effective soft decision capability to the system. The effectivity of this scheme is then further enhanced by the use of a simple pseudo-random bit interleaving scheme. Moreover, to increase the capacity of the PC-CDMA system, we propose a simple self-interference cancellation method for self-induced cross-correlation arising from the multipath environment. This further enhances the efficacy of the decoding scheme because the false contributions of the self-induced cross-correlation component are removed from the branch metric prior to soft decision Viterbi decoding. Finally, we simulated a possible PC-CDMA system with a user data rate of 1.92Mbps, transmitting it at a chip rate of 3.84Mcps and at 7.68Mcps under a multipath-Rayleigh fading interference environment. For a chip rate of 7.68Mcps, BER after Viterbi decoding is less than 3.2e-7 even without the use of interference cancellation. For a chip rate of 3.84Mcps, BER after Viterbi decoding with interference cancellation is 1.0e-4.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e80-a_7_1233/_p

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@ARTICLE{e80-a_7_1233,
author={Osamu KATO, Masatoshi WATANABE, Eiji KATSURA, Koichi HOMMA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Soft Decision Viterbi Decoding and Self-Interference Cancellation for High Speed Radio Communication by Parallel Combinatory CDMA},
year={1997},
volume={E80-A},
number={7},
pages={1233-1240},
abstract={We propose a soft decision Viterbi decoding scheme and a self-interference cancellation method applicable to a Parallel Combinatory CDMA (PC-CDMA) system. In this decoding scheme, branch metric is calculated for every bit by weighting the output levels of the PC-CDMA correlators so as to enable an effective soft decision capability to the system. The effectivity of this scheme is then further enhanced by the use of a simple pseudo-random bit interleaving scheme. Moreover, to increase the capacity of the PC-CDMA system, we propose a simple self-interference cancellation method for self-induced cross-correlation arising from the multipath environment. This further enhances the efficacy of the decoding scheme because the false contributions of the self-induced cross-correlation component are removed from the branch metric prior to soft decision Viterbi decoding. Finally, we simulated a possible PC-CDMA system with a user data rate of 1.92Mbps, transmitting it at a chip rate of 3.84Mcps and at 7.68Mcps under a multipath-Rayleigh fading interference environment. For a chip rate of 7.68Mcps, BER after Viterbi decoding is less than 3.2e-7 even without the use of interference cancellation. For a chip rate of 3.84Mcps, BER after Viterbi decoding with interference cancellation is 1.0e-4.},
keywords={},
doi={},
ISSN={},
month={July},}

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TY - JOUR
TI - Soft Decision Viterbi Decoding and Self-Interference Cancellation for High Speed Radio Communication by Parallel Combinatory CDMA
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1233
EP - 1240
AU - Osamu KATO
AU - Masatoshi WATANABE
AU - Eiji KATSURA
AU - Koichi HOMMA
PY - 1997
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E80-A
IS - 7
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - July 1997
AB - We propose a soft decision Viterbi decoding scheme and a self-interference cancellation method applicable to a Parallel Combinatory CDMA (PC-CDMA) system. In this decoding scheme, branch metric is calculated for every bit by weighting the output levels of the PC-CDMA correlators so as to enable an effective soft decision capability to the system. The effectivity of this scheme is then further enhanced by the use of a simple pseudo-random bit interleaving scheme. Moreover, to increase the capacity of the PC-CDMA system, we propose a simple self-interference cancellation method for self-induced cross-correlation arising from the multipath environment. This further enhances the efficacy of the decoding scheme because the false contributions of the self-induced cross-correlation component are removed from the branch metric prior to soft decision Viterbi decoding. Finally, we simulated a possible PC-CDMA system with a user data rate of 1.92Mbps, transmitting it at a chip rate of 3.84Mcps and at 7.68Mcps under a multipath-Rayleigh fading interference environment. For a chip rate of 7.68Mcps, BER after Viterbi decoding is less than 3.2e-7 even without the use of interference cancellation. For a chip rate of 3.84Mcps, BER after Viterbi decoding with interference cancellation is 1.0e-4.
ER -