On the transmitter-based preprocessing for 2-D OFDM-CDMA forward-link systems over time-varying Rayleigh fading channels

Chih-Cheng Kuo; Wern Ho Sheen; Chung-Ju Chang; Chang Lung Hsiao

doi:10.1109/TVT.2007.909256

On the transmitter-based preprocessing for 2-D OFDM-CDMA forward-link systems over time-varying Rayleigh fading channels

Chih-Cheng Kuo, Wern Ho Sheen, Chung-Ju Chang, Chang Lung Hsiao

National Chiao Tung University

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Transmitter-based preprocessing is investigated for 2-D orthogonal frequency-division multiplexing code-division multiple-access (OFDM-CDMA) forward-link systems for improving performance and shifting signal processing complexity from a mobile unit to a base station. Preprocessing schemes that are based on zero forcing (ZF) with power normalization, minimum mean square error (MMSE), and ZF with multiuser water filling (ZF-MWF) criteria are jointly investigated with 2-D spreading pattern optimization and multiuser scheduling from an information-theoretic viewpoint. Numerical results show that 1) the performance of preprocessing is quite sensitive to the 2-D spreading pattern for SNRs of interest, for example, 20% degradation on the sum data rate is observed for MMSE preprocessing if the spreading pattern is not properly selected; 2) ZF-MWF may substantially outperform the other two criteria depending on the SNRs; and 3) multiuser scheduling provides a significant performance improvement on the system sum data rate.

Original language	English
Pages (from-to)	1968-1974
Number of pages	7
Journal	IEEE Transactions on Vehicular Technology
Volume	57
Issue number	3
DOIs	https://doi.org/10.1109/TVT.2007.909256
State	Published - May 2008

Keywords

forward-link systems
sum data rate
transmitter preprocessing
two-dimensional (2-D) orthogonal frequency-division multiplexing code-division multiple access (OFDM-CDMA)

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title = "On the transmitter-based preprocessing for 2-D OFDM-CDMA forward-link systems over time-varying Rayleigh fading channels",

abstract = "Transmitter-based preprocessing is investigated for 2-D orthogonal frequency-division multiplexing code-division multiple-access (OFDM-CDMA) forward-link systems for improving performance and shifting signal processing complexity from a mobile unit to a base station. Preprocessing schemes that are based on zero forcing (ZF) with power normalization, minimum mean square error (MMSE), and ZF with multiuser water filling (ZF-MWF) criteria are jointly investigated with 2-D spreading pattern optimization and multiuser scheduling from an information-theoretic viewpoint. Numerical results show that 1) the performance of preprocessing is quite sensitive to the 2-D spreading pattern for SNRs of interest, for example, 20% degradation on the sum data rate is observed for MMSE preprocessing if the spreading pattern is not properly selected; 2) ZF-MWF may substantially outperform the other two criteria depending on the SNRs; and 3) multiuser scheduling provides a significant performance improvement on the system sum data rate.",

keywords = "forward-link systems, sum data rate, transmitter preprocessing, two-dimensional (2-D) orthogonal frequency-division multiplexing code-division multiple access (OFDM-CDMA)",

author = "Chih-Cheng Kuo and Sheen, {Wern Ho} and Chung-Ju Chang and Hsiao, {Chang Lung}",

year = "2008",

month = may,

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T1 - On the transmitter-based preprocessing for 2-D OFDM-CDMA forward-link systems over time-varying Rayleigh fading channels

AU - Kuo, Chih-Cheng

AU - Sheen, Wern Ho

AU - Chang, Chung-Ju

AU - Hsiao, Chang Lung

PY - 2008/5

Y1 - 2008/5

N2 - Transmitter-based preprocessing is investigated for 2-D orthogonal frequency-division multiplexing code-division multiple-access (OFDM-CDMA) forward-link systems for improving performance and shifting signal processing complexity from a mobile unit to a base station. Preprocessing schemes that are based on zero forcing (ZF) with power normalization, minimum mean square error (MMSE), and ZF with multiuser water filling (ZF-MWF) criteria are jointly investigated with 2-D spreading pattern optimization and multiuser scheduling from an information-theoretic viewpoint. Numerical results show that 1) the performance of preprocessing is quite sensitive to the 2-D spreading pattern for SNRs of interest, for example, 20% degradation on the sum data rate is observed for MMSE preprocessing if the spreading pattern is not properly selected; 2) ZF-MWF may substantially outperform the other two criteria depending on the SNRs; and 3) multiuser scheduling provides a significant performance improvement on the system sum data rate.

AB - Transmitter-based preprocessing is investigated for 2-D orthogonal frequency-division multiplexing code-division multiple-access (OFDM-CDMA) forward-link systems for improving performance and shifting signal processing complexity from a mobile unit to a base station. Preprocessing schemes that are based on zero forcing (ZF) with power normalization, minimum mean square error (MMSE), and ZF with multiuser water filling (ZF-MWF) criteria are jointly investigated with 2-D spreading pattern optimization and multiuser scheduling from an information-theoretic viewpoint. Numerical results show that 1) the performance of preprocessing is quite sensitive to the 2-D spreading pattern for SNRs of interest, for example, 20% degradation on the sum data rate is observed for MMSE preprocessing if the spreading pattern is not properly selected; 2) ZF-MWF may substantially outperform the other two criteria depending on the SNRs; and 3) multiuser scheduling provides a significant performance improvement on the system sum data rate.

KW - forward-link systems

KW - sum data rate

KW - transmitter preprocessing

KW - two-dimensional (2-D) orthogonal frequency-division multiplexing code-division multiple access (OFDM-CDMA)

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