標題: On the transmitter-based preprocessing for 2-D OFDM-CDMA forward-link systems over time-varying Rayleigh fading channels
作者: Kuo, Chih-Cheng
Sheen, Wern-Ho
Chang, Chung-Ju
Hsiao, Chang Lung
電信工程研究所
Institute of Communications Engineering
關鍵字: forward-link systems;sum data rate;transmitter preprocessing;two-dimensional (2-D) orthogonal frequency-division multiplexing code-division multiple access (OFDM-CDMA)
公開日期: 1-May-2008
摘要: 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.
URI: http://dx.doi.org/10.1109/TVT.2007.909256
http://hdl.handle.net/11536/9371
ISSN: 0018-9545
DOI: 10.1109/TVT.2007.909256
期刊: IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume: 57
Issue: 3
起始頁: 1968
結束頁: 1974
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