Turbo Multiuser Detection for LDPC Coded MC-CDMA Systems

Conference: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
09/11/2005 - 09/14/2005 at Berlin, Germany

Proceedings: PIMRC 2005

Pages: 4Language: englishTyp: PDF

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Duan, Zhanyun; Valkama, Mikko; Renfors, Markku (Tampere University of Technology, Institute of Communications Engineering, PO Box 553, 33101 Tampere, Finland)

This paper investigates the performance of LDPC coded MC-CDMA systems. Turbo multiuser detection is exploited by combining per-user MMSE-PIC detection and LDPC decoder together. In this way, error propagation can generally be averted for lower number of subcarriers. Simulation results show that the proposed scheme achieves about 4 dB coding gain for 256 subcarriers at BER = 10-4. The performance degrades only slightly with smaller spreading factors per MC-CDMA multiplex. Thus, from practical point of view, smaller spreading factors can be utilized to reduce the complexity of the detector as a whole.