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- W121149013 abstract "An OFDM-CDMA system that utilizes the channelcorrelation in both time and frequency to reduce multiple access interference is proposed. Orthogonal Walsh-Hadamard codes are used for spreading and in order for the codewords to stay orthogonal at the receiver, the channel response 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, named Time-Frequency Localized CDMA (TFLCDMA), places the codeword-chips in rectangular 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 (MC-DS), in terms of bit error rate. The MCand MC-DS-CDMA systems are special cases of the proposed scheme." @default.
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- W121149013 date "2002-01-01" @default.
- W121149013 modified "2023-09-27" @default.
- W121149013 title "Utilizing the channel correlation for MAI reduction in downlink multi-carrier CDMA systems" @default.
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