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 CN  Vol.5 No.3 C , September 2013
Signal Detection for OFDM-IDMA Uplink over Doubly Selective Channels
Abstract: Orthogonal frequency division multiplexing-interleave division multiple access (OFDM-IDMA) systems may suffer from serious inter-carrier interference (ICI) in time-and frequency-selective (doubly selective) channels. In such case, the conventional OFDM-IDMA detection algorithm for quasi-static channels will result in significantly performance degradation. In this paper, signal detection is investigated for OFDM-IDMA uplink over doubly selective channels. Firstly, the impact of time-varying channels for OFDM-IDMA uplink is analyzed, which leads to the failure of the conventional algorithm. Secondly, a novel iterative detection algorithm is developed based on an integrated interference canceller, which can iteratively estimate and mitigate the ICI as well as multiple access interference (MAI) simultaneously. In addition, an improved detection algorithm is derived for reducing the complexity using an approximation to the mean and variance of the interference. Simulation results indicate that the proposed algorithm can significantly enhance the system performance to the conventional case, and the improved algorithm can strike a balance between performance and complexity.
Cite this paper: Peng, T. , Xiao, Y. , Li, S. , Shu, H. and Simon, E. (2013) Signal Detection for OFDM-IDMA Uplink over Doubly Selective Channels. Communications and Network, 5, 249-254. doi: 10.4236/cn.2013.53B2046.
References

[1]   P. Li, L. H. Liu, K. Y. Wu and W. K. Leung, “A Unified Approach to Multiuser Detection and Space-time Coding with Low Complexity and Nearly Optimal Performance,” in Proc. 40th Allerton Conference, 2002, pp. 170-179.

[2]   P. Li, L. H. Liu, K. Y. Wu and W. K. Leung, “Interleave Division Multiple Access,” IEEE Transactions Wireless Communications, Vol. 5, No. 4, 2006, pp. 938-947.

[3]   P. Li, Q. H. Guo and J. Tong, “The OFDM-IDMA Approach to Wireless Communication Systems,” IEEE Wireless Communications Mag., Vol. 14, No. 3, 2007, pp. 18-24.

[4]   R. Zhang and L. Hanzo, “Three Design Aspects of Multicarrier Interleave Division Multiple Access,” IEEE Transactions Vehicular Technoogy, Vol. 57, No. 6, 2008, pp. 3607-3617. doi:10.1109/TVT.2008.918724

[5]   P. Hammarberg, F. Rusek and O. Edfors, “Channel Estimation Algorithms for OFDM-IDMA: Complexity and Performance,” IEEE Transactions Wireless Communications, Vol. 11, No. 5, 2012, pp. 1722-1732.

[6]   Y. Li and L. J. Cimini, “Bounds on the Interchannel Interference of OFDM in Time-varying Impairments,” IEEE Transactions Communications, Vol. 49, No. 3, 2001, pp. 401-404. doi:10.1109/26.911445

[7]   P. Schniter, “Low-Complexity Equalization of OFDM in Doubly Selective Channels,” IEEE Transactions Communications, Vol. 52, No. 4, 2004, pp. 1002-1011.

[8]   Y. X. Peng, K. Zheng, W. Wang, Y. Kim and Y. S. Lee, “Iterative Partial-Interference-Cancellation-based Detector for OFDM Systems over Doubly-Selective Rayleigh Fading Channels,” in Proc. IEEE International Symp. On Personal, Indoor and Mobile Radio Comm., 2007, pp. 1-5.

[9]   T. Zemen, C. F. Mecklenbrauker, J. Wehinger and R. R. Muller, “Iterative Joint Time-variant Channel Estimation and Multi-user Detection for MC-CDMA,” IEEE Transactions Wireless Communications, Vol. 5, No. 4, 2006, pp. 938-947.

[10]   S. W. Hou and C. C. Ko, “Intercarrier Interference Suppression for OFDMA Up-link in Time-and Frequency-Selective Fading Channels,” IEEE Transactions Vehicular Technoogy, Vol. 58, No. 6, 2009, pp. 2741-2754. doi:10.1109/TVT.2008.2010550

[11]   3GPP Technical Specification 36.104, 2010, “Evolved Universal Terrestrial Radio Access (E-UTRA): Base Station(BS) Radio Transmission and Reception,” Version 9.3.0, Mar. 2010.

 
 
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