Performance Evaluation for LDPC Coded OFDM-IDMA Systems over Frequency Selective Fading Channels

Orthogonal frequency division multiplexing (OFDM) and interleave-division multiple-access (IDMA) are both attractive technique in modern wireless communication. In this paper, we study a multi-user system, which combines OFDM and IDMA, and fortunately, inherits many advantages. In order to improve system performance, low-density parity-check (LDPC) coding is further applied. And moreover, a turbo-type iterative receiver structure is investigated to mitigate multi-use interference (MUI). Simulation results are conducted to illustrate performance improvement. It is demonstrated that MUI is canceling efficiently by means of iterative multi-user detection algorithm. The proposed scheme provides an efficient solution to high-rate multiuser communications over multipath fading channels.