Improved SNR evolution for OFDM-IDMA systems

Jian Dang, Liuqing Yang, Zaichen Zhang

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


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.

Original languageEnglish (US)
Article number6138264
Pages (from-to)65-68
Number of pages4
JournalIEEE Wireless Communications Letters
Issue number2
StatePublished - Apr 2012
Externally publishedYes

Bibliographical note

Funding Information:
Manuscript received December 11, 2011. The associate editor coordinating the review of this letter and approving it for publication was X. Wang. This work is in part supported by the National Science Foundation under grant No. 1129043, and by the National Natural Science Foundation of China under grant No. 61001067, 60802005 and 60902010. J. Dang and Z. Zhang are with the National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China (e-mail: {newwanda, zczhang} L. Yang is with the Department of Electrical and Computer Engineering, Colorado State University, 1373 Campus Delivery, Fort Collins, CO 80523-1373, USA (e-mail: Digital Object Identifier 10.1109/WCL.2012.011712.110245


  • SNR evolution
  • lower bound


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