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Improved SNR Evolution for OFDM-IDMA Systems

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3 Author(s)
Jian Dang ; National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China ; Liuqing Yang ; Zaichen Zhang

The bit error rate performance of interleave division multiple access (IDMA) based systems can be predicted by signal-to-noise ratio (SNR) evolution which tracks the average symbol SNR at each iteration and provides a faster solution than brute-force simulations. As the desired SNR in the evolution procedure is hard to obtain, approximate SNR updating formula has been widely adopted in the literature. In this paper a revised SNR updating formula is proposed for orthogonal frequency division multiplexing interleave division multiple access (OFDM-IDMA) systems in Rayleigh fading channels. Theoretical analysis shows that the new updating formula provides a tighter lower bound of the expected SNR in the evolution procedure compared with the existing one. We then verified this by simulations.

Published in:

IEEE Wireless Communications Letters  (Volume:1 ,  Issue: 2 )