DocumentCode :
1944555
Title :
Semiblind estimation of time varying STFBC-OFDM channels using Kalman filter and CMA
Author :
Hassan, Mohamed A S ; Sharif, Bayan S. ; Woo, Wai Lok ; Jimaa, Shihab
Author_Institution :
Sch. of Electr., Electron. & Comput. Eng., Newcastle upon Tyne Univ., UK
Volume :
2
fYear :
2004
fDate :
28 June-1 July 2004
Firstpage :
594
Abstract :
In multiple input multiple output systems (MIMO), the increase in the number of channel parameters, renders less reliable conventional training based schemes. For a reasonable performance, conventional training based methods require a larger number of training symbols which reduces system bandwidth efficiency. In this paper, a semiblind channel estimation and tracking technique is proposed for concatenated turbo codes (TC) with space-time and frequency block codes (STFBC) over time-varying Rayleigh fading channels. The paper describes an effective approach to reduce the number of training symbols to half by implementing the Kalman filter (KF) with the constant modulus algorithm (CMA). Computer simulations show good estimation and tracking by the Kalman filter and CMA with only few training symbols (less than 7% of bandwidth efficiency loss) even when signals experience deep fades. The proposed method is shown to obtain fast channel estimation and tracking which is a requirement in fast fading channels.
Keywords :
Kalman filters; MIMO systems; OFDM modulation; Rayleigh channels; block codes; channel coding; channel estimation; concatenated codes; space-time codes; time-varying channels; turbo codes; Kalman filter; concatenated turbo codes; constant modulus algorithm; multiple input multiple output systems; orthogonal frequency division multiplexing; semiblind channel estimation; space-time and frequency block codes; time varying STFBC-OFDM channels; time-varying Rayleigh fading channels; training based schemes; Bandwidth; Block codes; Channel estimation; Fading; Frequency diversity; Frequency estimation; MIMO; OFDM; Reliability engineering; Turbo codes;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Computers and Communications, 2004. Proceedings. ISCC 2004. Ninth International Symposium on
Print_ISBN :
0-7803-8623-X
Type :
conf
DOI :
10.1109/ISCC.2004.1358603
Filename :
1358603
Link To Document :
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