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Adaptive Space-Time-Spreading-Assisted Wideband CDMA Systems Communicating over Dispersive Nakagami-m Fading Channels

Yang, L-L. and Hanzo, L. (2005) Adaptive Space-Time-Spreading-Assisted Wideband CDMA Systems Communicating over Dispersive Nakagami-m Fading Channels EURASIP Journal on Wireless Communications and Networking, 2005, (2), pp. 216-230.

Record type: Article


In this contribution, the performance of wideband code-division multiple-access (W-CDMA) systems using space-timespreading-(STS-) based transmit diversity is investigated, when frequency-selective Nakagami-m fading channels, multiuser interference, and background noise are considered. The analysis and numerical results suggest that the achievable diversity order is the product of the frequency-selective diversity order and the transmit diversity order. Furthermore, both the transmit diversity and the frequency-selective diversity have the same order of importance. Since W-CDMA signals are subjected to frequencyselective fading, the number of resolvable paths at the receiver may vary over a wide range depending on the transmission environment encountered. It can be shown that, for wireless channels where the frequency selectivity is sufficiently high, transmit diversity may be not necessitated. Under this case, multiple transmission antennas can be leveraged into an increased bitrate. Therefore, an adaptive STS-based transmission scheme is then proposed for improving the throughput ofW-CDMA systems. Our numerical results demonstrate that this adaptive STS-based transmission scheme is capable of significantly improving the effective throughput of W-CDMA systems. Specifically, the studied W-CDMA system’s bitrate can be increased by a factor of three at the modest cost of requiring an extra 0.4 dB or 1.2 dB transmitted power in the context of the investigated urban or suburban areas, respectively.

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Published date: April 2005
Additional Information: Special issue on advance signal processing algorithms for wireless communications.
Keywords: CDMA, space-time spreading, Nakagami-m fading, transmit diversity.
Organisations: Southampton Wireless Group


Local EPrints ID: 261649
ISSN: 1687-1472
PURE UUID: ea6bc972-69d6-42c9-a692-1e53e2cc7987
ORCID for L-L. Yang: ORCID iD

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Date deposited: 13 Dec 2005
Last modified: 18 Jul 2017 09:00

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Author: L-L. Yang ORCID iD
Author: L. Hanzo

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