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Bit-Interleaved Coded Modulation with Iterative Interference Suppression for Multi-Sequence Signaling Based MC-CDMA

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3 Author(s)
Der-Feng Tseng ; Dept. of Electr. Eng., Nat. Taiwan Univ. of Sci. & Technol., Taipei ; Wei-Yu Lai ; Keng-Chi Lu

This paper addresses an iterative receiver with joint detection and decoding for multi-carrier code division multiple access (MC-CDMA) systems employing multi-sequence signaling. A bit-interleaved coded modulation (BICM) technique, facilitating the "turbo principle" receiver through iterative processing, is utilized to maximize the frequency diversity, followed by a multi-sequence signaling set mapper with functionality of modulation in conjunction with spreading. User cross-correlations could be adversely increased due to the channel frequency selectivity and utilization of expanded signature sequences per user. To account for this ensuring performance loss, we employ a soft space-time interference cancellation receiver derived by minimum mean-squared error (MMSE) sense on a basis of per sequence plane per user to provide reliabilities of code bits. Simulation results justify our proposed approach in terms of bit error rate over a quasi-static fading channel with the number of users a significant fraction of spreading length. Performance comparison between our proposed scheme and conventional bandwidth-efficient coded MC-CDMA system is also manifested via simulations

Published in:

Vehicular Technology Conference, 2006. VTC 2006-Spring. IEEE 63rd  (Volume:5 )

Date of Conference:

7-10 May 2006