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      Turbo/katlamalı kodlanmış SFBC/STBC-OFDM sistemlerinde yinelemeli kanal kestirimi

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      Author(s)
      Doǧan, H.
      Çırpan, H. A.
      Panayırcı, Erdal
      Date
      2006-04
      Source Title
      2006 IEEE 14th Signal Processing and Communications Applications Conference
      Pages
      1 - 4
      Language
      Turkish
      Type
      Conference Paper
      Item Usage Stats
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      Abstract
      We consider the design of turbo receiver structures for space-frequency block coded (SFBC/STBC) OFDM systems in unknown frequency selective fading channels. The Turbo receiver structures for SFBC/STBC-OFDM systems under consideration consists of an iterative MAP Expectation/Maximization (EM) channel estimation algorithm, soft MMSE SFBC/STBC decoder and a soft MAP outer-channel-code decoder. MAP-EM employs iterative channel estimation and it improves receiver performance by re-estimating the channel after each decoder iteration. Moreover, the MAP-EM approach considers the channel variations as random processes and applies the Karhunen-Loeve (KL) orthogonal series expansion. The performance of the proposed approaches are studied in terms of mean square error and bit-error rate. Through experimental results, the effect of a pilot spacing on the channel estimator performance and sensitivity of turbo receiver structures on channel estimation error are studied. © 2006 IEEE.
      Keywords
      Decoders
      Karhunen-Loeve (KL) orthogonal series expansion
      Turbo receiver
      Bit error rate
      Block codes
      Fading channels
      Iterative decoding
      Mean square error
      Optimization
      Orthogonal frequency division multiplexing
      Turbo codes
      Channel estimation
      Permalink
      http://hdl.handle.net/11693/27200
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/SIU.2006.1659853
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      • Department of Electrical and Electronics Engineering 3702
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