Reduction of MAI in Asynchronous DS/CDMA Systems Using Post-Filter

Yutaka JITSUMATSU; Tahir ABBAS KHAN; Tohru KOHDA

Reduction of MAI in Asynchronous DS/CDMA Systems Using Post-Filter

Yutaka JITSUMATSU, Tahir ABBAS KHAN, Tohru KOHDA

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We propose a post-filter (digital filter applied after the correlator) to reduce multiple-access interference (MAI) in the correlator output in asynchronous communications. Optimum filter coefficients are derived for Markov and i.i.d. codes. It is shown that post-filter is not needed for Markov case. Variance of MAI is reduced in i.i.d. codes and it becomes equal to that of Markov codes; thus, both will have the same bit error rate (BER) performance. This post-filter reduces level of MAI in the correlator output for Gold codes as well.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E87-A No.9 pp.2301-2307

Publication Date: 2004/09/01

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Type of Manuscript: Special Section PAPER (Special Section on Nonlinear Theory and its Applications)

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Yutaka JITSUMATSU, Tahir ABBAS KHAN, Tohru KOHDA, "Reduction of MAI in Asynchronous DS/CDMA Systems Using Post-Filter" in IEICE TRANSACTIONS on Fundamentals, vol. E87-A, no. 9, pp. 2301-2307, September 2004, doi: .
Abstract: We propose a post-filter (digital filter applied after the correlator) to reduce multiple-access interference (MAI) in the correlator output in asynchronous communications. Optimum filter coefficients are derived for Markov and i.i.d. codes. It is shown that post-filter is not needed for Markov case. Variance of MAI is reduced in i.i.d. codes and it becomes equal to that of Markov codes; thus, both will have the same bit error rate (BER) performance. This post-filter reduces level of MAI in the correlator output for Gold codes as well.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1587/e87-a_9_2301/_p

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@ARTICLE{e87-a_9_2301,
author={Yutaka JITSUMATSU, Tahir ABBAS KHAN, Tohru KOHDA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Reduction of MAI in Asynchronous DS/CDMA Systems Using Post-Filter},
year={2004},
volume={E87-A},
number={9},
pages={2301-2307},
abstract={We propose a post-filter (digital filter applied after the correlator) to reduce multiple-access interference (MAI) in the correlator output in asynchronous communications. Optimum filter coefficients are derived for Markov and i.i.d. codes. It is shown that post-filter is not needed for Markov case. Variance of MAI is reduced in i.i.d. codes and it becomes equal to that of Markov codes; thus, both will have the same bit error rate (BER) performance. This post-filter reduces level of MAI in the correlator output for Gold codes as well.},
keywords={},
doi={},
ISSN={},
month={September},}

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TY - JOUR
TI - Reduction of MAI in Asynchronous DS/CDMA Systems Using Post-Filter
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 2301
EP - 2307
AU - Yutaka JITSUMATSU
AU - Tahir ABBAS KHAN
AU - Tohru KOHDA
PY - 2004
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E87-A
IS - 9
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - September 2004
AB - We propose a post-filter (digital filter applied after the correlator) to reduce multiple-access interference (MAI) in the correlator output in asynchronous communications. Optimum filter coefficients are derived for Markov and i.i.d. codes. It is shown that post-filter is not needed for Markov case. Variance of MAI is reduced in i.i.d. codes and it becomes equal to that of Markov codes; thus, both will have the same bit error rate (BER) performance. This post-filter reduces level of MAI in the correlator output for Gold codes as well.
ER -