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 language | English |
---|---|
Pages (from-to) | 450-460 |
Number of pages | 11 |
Journal | IEEE Transactions on Vehicular Technology |
Volume | 53 |
Issue number | 2 |
DOIs | |
Publication status | Published - 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: [email protected]). Y. G. Kim is with Kasan Electronics, Inc., Anyang, Korea (e-mail: [email protected]). C. G. Kang is with the School of Electrical Engineering, Korea University, Seoul 136-701, Korea (e-mail: [email protected]). 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