2-Dimensional OVSF Spread/Chip-Interleaved CDMA

Le LIU; Fumiyuki ADACHI

doi:10.1093/ietcom/e89-b.12.3363

2-Dimensional OVSF Spread/Chip-Interleaved CDMA

Le LIU, Fumiyuki ADACHI

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Multiple-access interference (MAI) limits the bit error rate (BER) performance of CDMA uplink transmission. In this paper, we propose a generalized chip-interleaved CDMA with 2-dimensional (2D) spreading using orthogonal variable spreading factor (OVSF) codes to minimize the MAI effects and achieve the maximum available time- and frequency-domain diversity gains. We present the code assignment for 2D spreading to provide users with flexible multi-rate data transmission. A computer simulation shows that by the joint use of 2D OVSF spreading and chip-interleaving, MAI-free transmission is possible for the quasi-synchronous DS- or MC-CDMA uplink, and hence the single-user frequency-domain equalization based on the MMSE criterion can be applied for signal detection. The BER performance in a time- and frequency-selective fading multiuser channel is theoretically analyzed and evaluated by both numerical computation and computer simulation.

Publication: IEICE TRANSACTIONS on Communications Vol.E89-B No.12 pp.3363-3375

Publication Date: 2006/12/01

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Online ISSN: 1745-1345

DOI: 10.1093/ietcom/e89-b.12.3363

Type of Manuscript: PAPER

Category: Wireless Communication Technologies

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Le LIU, Fumiyuki ADACHI, "2-Dimensional OVSF Spread/Chip-Interleaved CDMA" in IEICE TRANSACTIONS on Communications, vol. E89-B, no. 12, pp. 3363-3375, December 2006, doi: 10.1093/ietcom/e89-b.12.3363.
Abstract: Multiple-access interference (MAI) limits the bit error rate (BER) performance of CDMA uplink transmission. In this paper, we propose a generalized chip-interleaved CDMA with 2-dimensional (2D) spreading using orthogonal variable spreading factor (OVSF) codes to minimize the MAI effects and achieve the maximum available time- and frequency-domain diversity gains. We present the code assignment for 2D spreading to provide users with flexible multi-rate data transmission. A computer simulation shows that by the joint use of 2D OVSF spreading and chip-interleaving, MAI-free transmission is possible for the quasi-synchronous DS- or MC-CDMA uplink, and hence the single-user frequency-domain equalization based on the MMSE criterion can be applied for signal detection. The BER performance in a time- and frequency-selective fading multiuser channel is theoretically analyzed and evaluated by both numerical computation and computer simulation.
URL: https://globals.ieice.org/en_transactions/communications/10.1093/ietcom/e89-b.12.3363/_p

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@ARTICLE{e89-b_12_3363,
author={Le LIU, Fumiyuki ADACHI, },
journal={IEICE TRANSACTIONS on Communications},
title={2-Dimensional OVSF Spread/Chip-Interleaved CDMA},
year={2006},
volume={E89-B},
number={12},
pages={3363-3375},
abstract={Multiple-access interference (MAI) limits the bit error rate (BER) performance of CDMA uplink transmission. In this paper, we propose a generalized chip-interleaved CDMA with 2-dimensional (2D) spreading using orthogonal variable spreading factor (OVSF) codes to minimize the MAI effects and achieve the maximum available time- and frequency-domain diversity gains. We present the code assignment for 2D spreading to provide users with flexible multi-rate data transmission. A computer simulation shows that by the joint use of 2D OVSF spreading and chip-interleaving, MAI-free transmission is possible for the quasi-synchronous DS- or MC-CDMA uplink, and hence the single-user frequency-domain equalization based on the MMSE criterion can be applied for signal detection. The BER performance in a time- and frequency-selective fading multiuser channel is theoretically analyzed and evaluated by both numerical computation and computer simulation.},
keywords={},
doi={10.1093/ietcom/e89-b.12.3363},
ISSN={1745-1345},
month={December},}

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TY - JOUR
TI - 2-Dimensional OVSF Spread/Chip-Interleaved CDMA
T2 - IEICE TRANSACTIONS on Communications
SP - 3363
EP - 3375
AU - Le LIU
AU - Fumiyuki ADACHI
PY - 2006
DO - 10.1093/ietcom/e89-b.12.3363
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E89-B
IS - 12
JA - IEICE TRANSACTIONS on Communications
Y1 - December 2006
AB - Multiple-access interference (MAI) limits the bit error rate (BER) performance of CDMA uplink transmission. In this paper, we propose a generalized chip-interleaved CDMA with 2-dimensional (2D) spreading using orthogonal variable spreading factor (OVSF) codes to minimize the MAI effects and achieve the maximum available time- and frequency-domain diversity gains. We present the code assignment for 2D spreading to provide users with flexible multi-rate data transmission. A computer simulation shows that by the joint use of 2D OVSF spreading and chip-interleaving, MAI-free transmission is possible for the quasi-synchronous DS- or MC-CDMA uplink, and hence the single-user frequency-domain equalization based on the MMSE criterion can be applied for signal detection. The BER performance in a time- and frequency-selective fading multiuser channel is theoretically analyzed and evaluated by both numerical computation and computer simulation.
ER -