DocumentCode :
2157591
Title :
Optimization of delay diversity for decision-feedback equalization
Author :
Yiu, S. ; Schober, R. ; Gerstacker, W.
Author_Institution :
British Columbia Univ., Vancouver, BC, Canada
Volume :
1
fYear :
2004
fDate :
5-8 Sept. 2004
Firstpage :
68
Abstract :
We optimize delay diversity (DD) for the case when computationally efficient decision-feedback equalization (DFE) is used at the receiver. We consider the general case of transmission over a correlated multiple-input multiple-output (MIMO) frequency-selective fading channel. The proposed optimization requires knowledge of the statistical properties of the wireless channel at the transmitter, but channel state information is only required at the receiver side. Based on an approximation of the pairwise error probability for DFE, we derive a stochastic gradient algorithm that allows us to optimize the DD transmit filters. Simulation results for the GSM/EDGE system show significant performance gains of the proposed optimized DD scheme over the DD schemes reported by D. Gore et al. (see Proc. IEEE Int. Conf. Commun., p.1949-53, 2002) and R. Schober et al. (see Proc. IEEE ICC, 2004), respectively, if DFE is used at the receiver.
Keywords :
MIMO systems; approximation theory; cellular radio; decision feedback equalisers; delays; diversity reception; error statistics; fading channels; filtering theory; gradient methods; optimisation; radio receivers; space-time codes; statistical analysis; stochastic processes; DFE; GSM/EDGE system; STC; channel state information; correlated MIMO channel; correlated multiple-input multiple-output channel; decision-feedback equalization; delay diversity optimization; frequency-selective channel; frequency-selective fading channel; pairwise error probability approximation; receiver; space-time codes; stochastic gradient algorithm; transmit filters; transmitter; wireless channel statistical properties; Approximation algorithms; Channel state information; Decision feedback equalizers; Delay; Filters; Frequency-selective fading channels; MIMO; Pairwise error probability; Stochastic processes; Transmitters;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004. 15th IEEE International Symposium on
Print_ISBN :
0-7803-8523-3
Type :
conf
DOI :
10.1109/PIMRC.2004.1370838
Filename :
1370838
Link To Document :
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