Iterative receiver for joint detection and channel estimation in OFDM systems under mobile radio channels

Seung Young Park, Yeun Gu Kim, Chung Gu Kang

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

In this paper, an iterative receiver for a joint data-detection and channel-estimation scheme is presented for orthogonal frequency-division multiplexing systems, which incorporates iterative decoding in the receiver. In the proposed scheme, a maximum a posteriori-based decoder and a channel estimator provide more reliable information on the coded bits for each other in an iterative manner. We first consider a practical implementation issue for the optimal minimum mean squared error two-dimensional (2-D) channel estimator as an essential element in the iterative receiver. To reduce the complexity of the 2-D estimator as suited to the iterative receiver, we focus on rigorously investigating how a separable estimator must be designed so that its structure may become asymptotically equivalent to that of the optimal 2-D estimator. Furthermore, we derive an analytical expression of the iterative process to evaluate a convergence performance as a function of the number of iterations and discuss its convergence property. Our simulation results demonstrate that the proposed iterative receiver achieves a near-ideal performance with only a few iterations under time-variant multipath fading channels.

Original languageEnglish
Pages (from-to)450-460
Number of pages11
JournalIEEE Transactions on Vehicular Technology
Volume53
Issue number2
DOIs
Publication statusPublished - 2004 Mar

Bibliographical note

Funding Information:
Manuscript received June 14, 2001; revised March 28, 2002, February 17, 2003, July 18, 2003, November 3, 2003, and November 12, 2003. This research was supported by the University IT Research Center Project, Korea. S. Y. Park is with the Samsung Advanced Institute of Technology, Yong-In 449-712, Korea (e-mail: s.young.park@samsung.com). Y. G. Kim is with Kasan Electronics, Inc., Anyang, Korea (e-mail: titan@kasan.com). C. G. Kang is with the School of Electrical Engineering, Korea University, Seoul 136-701, Korea (e-mail: ccgkang@korea.ac.kr). Digital Object Identifier 10.1109/TVT.2004.823536

Keywords

  • Channel estimation
  • Orthogonal frequency-division multiplexing (OFDM)
  • Rayleigh-fading channels
  • Turbo processing

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics

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