Joint frequency-domain differential detection and equalization for 2-dimensional spread/chip-interleaved DS-CDMA uplink transmissions

Le Liu; Fumiyuki Adachi

doi:10.1109/VTCF.2006.369

Joint frequency-domain differential detection and equalization for 2-dimensional spread/chip-interleaved DS-CDMA uplink transmissions

Le Liu, Fumiyuki Adachi

Research Organization of Electrical Communication (ROEC)

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The multiple-access interference (MAI) limits the performance of the DS-CDMA uplink transmission. 2 dimensional (2D) spread/chip-interleaved DS-CDMA is an MAI-free system, where single-user coherent frequency-domain equalization (FDE) can be used instead of complicated multiuser detection (MUD). However, coherent FDE needs channel estimation. Pilot-assisted channel estimation is not reliable in a fast fading environment. In this paper, we apply joint frequency-domain differential detection and equalization (FDDDE) that requires no channel estimation to 2D spread/chip-interleaved DS-CDMA in a multiuser/multipath environment. The filter coefficient used in FDDDE is updated by estimating the normalized Doppler frequency. Computer simulation results show that 2D spread/chip-interleaved DS-CDMA using FDDDE is robust against fast fading.

Original language	English
Title of host publication	2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall
Pages	1768-1772
Number of pages	5
DOIs	https://doi.org/10.1109/VTCF.2006.369
Publication status	Published - 2006
Event	2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall - Montreal, QC, Canada Duration: 2006 Sep 25 → 2006 Sep 28

Publication series

Name	IEEE Vehicular Technology Conference
ISSN (Print)	1550-2252

Other

Other	2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall
Country	Canada
City	Montreal, QC
Period	06/9/25 → 06/9/28

Keywords

2-dimensional spreading
Chip interleaving
DS-CDMA uplink transmission
Differential detection

ASJC Scopus subject areas

Computer Science Applications
Electrical and Electronic Engineering
Applied Mathematics

Access to Document

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Joint frequency-domain differential detection and equalization for 2-dimensional spread/chip-interleaved DS-CDMA uplink transmissions. / Liu, Le; Adachi, Fumiyuki.

2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall. 2006. p. 1768-1772 4109634 (IEEE Vehicular Technology Conference).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Liu, L & Adachi, F 2006, Joint frequency-domain differential detection and equalization for 2-dimensional spread/chip-interleaved DS-CDMA uplink transmissions. in 2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall., 4109634, IEEE Vehicular Technology Conference, pp. 1768-1772, 2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall, Montreal, QC, Canada, 06/9/25. https://doi.org/10.1109/VTCF.2006.369

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keywords = "2-dimensional spreading, Chip interleaving, DS-CDMA uplink transmission, Differential detection",

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AB - The multiple-access interference (MAI) limits the performance of the DS-CDMA uplink transmission. 2 dimensional (2D) spread/chip-interleaved DS-CDMA is an MAI-free system, where single-user coherent frequency-domain equalization (FDE) can be used instead of complicated multiuser detection (MUD). However, coherent FDE needs channel estimation. Pilot-assisted channel estimation is not reliable in a fast fading environment. In this paper, we apply joint frequency-domain differential detection and equalization (FDDDE) that requires no channel estimation to 2D spread/chip-interleaved DS-CDMA in a multiuser/multipath environment. The filter coefficient used in FDDDE is updated by estimating the normalized Doppler frequency. Computer simulation results show that 2D spread/chip-interleaved DS-CDMA using FDDDE is robust against fast fading.

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Joint frequency-domain differential detection and equalization for 2-dimensional spread/chip-interleaved DS-CDMA uplink transmissions

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Keywords

ASJC Scopus subject areas

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