Rate optimization for IDMA systems with iterative joint multi-user decoding

Authors:
Tao Yang;Jinhong Yuan;Zhenning Shi
Affiliations:
School of Electrical Engineering and Telecommunications, University of New South Wales, Sydney, N.S.W., Australia;School of Electrical Engineering and Telecommunications, University of New South Wales, Sydney, N.S.W., Australia;National ICT Australia and Australian National University
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

Citing 7
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Abstract

In this letter, we develop a rate allocation scheme for interleave-division multiple-access (IDMA) systems with iterative decoding. We use a fully-analytical approach to predict the performance of the scheme. Then, we propose a modified linear programming method to find the best rate profile for the scheme. Numerical results show that with just repetition coding and optimal rate allocation, the performance of the scheme is only about 5 dB away from the capacity for a wide range of SNR, provided that the number of users is sufficiently large. Compared with power allocation schemes for IDMA, the proposed rate allocation scheme achieves a similar performance at a moderate spectral efficiency and the requirement of sophisticated power amplifiers can be relaxed.