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

页码：118 / 122

页数：5

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