Time-frequency localized CDMA for downlink multi-carrier systems

被引：0
|
作者：
Persson, A [1 ]
Ottosson, T [1 ]
Ström, E [1 ]
机构：
[1] Chalmers Univ Technol, Dept Signals & Syst, SE-41296 Gothenburg, Sweden
来源：
2002 IEEE SEVENTH INTERNATIONAL SYMPOSIUM ON SPREAD SPECTRUM TECHNIQUES AND APPLICATIONS, VOLS 1-3, PROCEEDINGS | 2002年
关键词：
D O I：
暂无
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
An OFDM-CDMA system that. utilizes the channel-correlation in both time and frequency to reduce multiple access interference is proposed. The mutually orthogonal Walsh-Hadamard codes are used for spreading, and in order for the codewords to stay orthogonal at the receiver the channel must be flat in both time and frequency. A frequency-selective fading channel will, however, distort the codewords and thus introduce correlation. The proposed system, Time-Frequency Localized CDMA (TFL-CDMA), places the codewords in blocks on the time-frequency-grid in a such a way that the difference in scaling of the codeword chips is reduced. The proposed system is found to outperform competing schemes, such as Multi-Carrier (MC) and Multi-Carrier Direct-Sequence CDMA (MCDS), in terms of bit error rate. The MC- and MCDS-CDMA systems are shown to be special cases of the proposed scheme.
引用
收藏
页码：118 / 122
页数：5
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