Symbol Detection of IDMA Systems in the Presence of Carrier Frequency Offsets

Authors:
Jian Dang;Liuqing Yang;Zaichen Zhang
Affiliations:
National Mobile Communications Research Laboratory, Southeast University, Nanjing, China 210096;Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, USA 80523;National Mobile Communications Research Laboratory, Southeast University, Nanjing, China 210096
Venue:
Wireless Personal Communications: An International Journal
Year:
2013

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Abstract

In this paper we investigate the detection algorithms for interleave division multiple access (IDMA) systems in the presence of carrier frequency offsets (CFOs). The existing IDMA detection algorithm is designed under the zero CFO assumption and its performance will be degraded when the CFOs are present. We first extend the existing algorithm to the nonzero CFO case by utilizing effective channel coefficients which take the CFO effects into account. Then we turn to a more practical scenario with imperfect CFO estimates. We propose an algorithm that can cope with the residual CFO effects by integrating the CFO updating into the iterative receiver. Signal-to-interference-plus-noise ratio analysis and simulations show the feasibility and superiority of our proposed algorithms.