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

Research output: Contribution to journalArticlepeer-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 languageEnglish
Pages (from-to)1968-1974
Number of pages7
JournalIEEE Transactions on Vehicular Technology
Volume57
Issue number3
DOIs
StatePublished - 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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