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A New Multicarrier Multicode DS-CDMA Scheme for Time and Frequency Selective Fading Channels  

Cao Yewen (School of Computing, University of Glamorgan)
Tjhung Tjeng Thiang (Institute for Infocomm Research, Singapore Science Park II)
Ko Chi Chung (Department of Electrical & Computer Engineering, National University of Singapore)
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Abstract
In this paper, a new multi carrier, direct sequence code division multiple access (MC-DS-CDMA) system is proposed. Our new signal construction is based on convolutional encoding of the transmitted data, serial-to-parallel (S/P) conversion of the encoded data, Walsh-Hadamard-transformation (WHT), a second S/P conversion of the WHT outputs, spread spectrum (SS) modulation with a common pseudo-noise (PN) sequence, and then multicarrier transmission. The system bit error rate (BER) performance in frequency selective fading channel in the presence of additive white Gaussian noise (AWGN) and a jamming tone is analyzed and simulated. The numerical results are compared with those from an orthogonal MC-DS-CDMA system of Sourour and Nakagawa [7]. It is shown that the two systems have almost the same BER performance, but the proposed scheme has better anti-jamming ability.
Keywords
DS-CDMA; multicarrier CDMA system; multicode transmission;
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