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Low-Complexity MAP-Based Successive Data Detection for Coded OFDM Systems Over Highly Mobile Wireless Channels

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Date
2011
Author
Panayirci, Erdal
Dogan, Hakan
Poor, H. Vincent
Abstract
This paper is concerned with the challenging and timely problem of data detection for coded orthogonal frequency-division multiplexing (OFDM) systems in the presence of frequency-selective and very rapidly time varying channels. New low-complexity maximum a posteriori probability (MAP) data detection algorithms are proposed based on sequential detection with optimal ordering (SDOO) and sequential detection with successive cancellation (SDSC). The received signal vector is optimally decomposed into reduced dimensional subobservations by exploiting the banded structure of the frequency-domain channel matrix whose bandwidth is a parameter to be adjusted according to the speed of the mobile terminal. The data symbols are then detected by the proposed algorithms in a computationally efficient way by means of the Markov chain Monte Carlo (MCMC) technique with Gibbs sampling. The impact of the imperfect channel state information (CSI) on the bit error rate (BER) performance of these algorithms is investigated analytically and by computer simulations. A detailed computational complexity investigation and simulation results indicate that particularly the algorithm based on SDSC has significant performance and complexity advantages and is very robust against channel estimation errors compared with existing suboptimal detection and equalization algorithms proposed earlier in the literature.

Issue

6

Volume

60

Pages

2849-2857

URI

https://hdl.handle.net/20.500.12469/974
https://doi.org/10.1109/TVT.2011.2158564

Collections

  • Araştırma Çıktıları / Scopus [1319]
  • Araştırma Çıktıları / WOS [1335]
  • Elektrik-Elektronik Mühendisliği / Electrical - Electronics Engineering [330]

Keywords

Fast time-varying channels
Gibbs sampling
Intercarrier interference (ICI)
Markov chain
Maximum a posteriori probability (MAP) detection
Monte Carlo technique
Orthogonal frequency-division multiplexing (OFDM)

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Theme by 
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