DocumentCode :
806259
Title :
Blind equalization for an application of unitary space-time modulation in ISI channels
Author :
Aktas, Emre ; Mitra, Urbashi
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Melbourne, Vic., Australia
Volume :
51
Issue :
11
fYear :
2003
fDate :
11/1/2003 12:00:00 AM
Firstpage :
2931
Lastpage :
2942
Abstract :
Transmit diversity schemes have gained attention due to the promise of increased capacity and improved performance. Among these schemes, unitary space-time modulation and differentially encoded unitary space-time modulation allow for simple noncoherent decoding for flat-fading channels. In this paper, a new blind equalization algorithm for these transmission schemes in intersymbol interference (ISI) channels is proposed. A matrix-type constant modulus algorithm that exploits the unitary structure of the space-time codes is developed. The equalizer is paired with a noncoherent decoder, resulting in a completely blind, low-complexity method for decoding in the presence of ISI. A noiseless convergence analysis is conducted and verified via simulation in both noiseless and noisy cases. The performance of the overall system is evaluated via simulation and semi-analytically, and the achieved performance is between that of the ideal zero-forcing and the minimum-mean squared-error equalizers.
Keywords :
blind equalisers; convergence of numerical methods; decoding; diversity reception; fading channels; intersymbol interference; matrix algebra; modulation; space-time codes; ISI channels; blind equalization; blind equalization algorithm; differentially encoded unitary space-time modulation; flat-fading channels; ideal zero-forcing equalizers; intersymbol interference channels; low-complexity method; matrix-type constant modulus algorithm; minimum-mean squared-error equalizers; noiseless convergence analysis; noncoherent decoder; noncoherent decoding; simulation; space-time codes; system performance; transmit diversity; unitary space-time modulation; Blind equalizers; Channel state information; Convergence; Decoding; Intersymbol interference; Multipath channels; Signal processing algorithms; Space time codes; Transmitters; Transmitting antennas;
fLanguage :
English
Journal_Title :
Signal Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1053-587X
Type :
jour
DOI :
10.1109/TSP.2003.818553
Filename :
1237425
Link To Document :
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