DocumentCode :
1678958
Title :
Time varying vector channel estimation for adaptive spatial equalization
Author :
Raleigh, Gregory G. ; Paulraj, Arogyaswami
Author_Institution :
Inf. Syst. Lab., Stanford Univ., CA, USA
Volume :
1
fYear :
1995
Firstpage :
218
Abstract :
New blind adaptive spatial equalization techniques are proposed for severe multipath fading with co-channel interference. In rapidly fading environments, equalizer performance suffers with existing algorithms because the desired and interference channels change significantly over the update time interval. It is shown that for fast fading channels, conventional squared error equalizer cost functions can yield poor results. A new algorithm is proposed based on a variation of the SINR cost function coupled with optimal time varying channel estimation to improve signal tracking. In simulations, the algorithm achieves theoretically optimum time varying equalizer performance in extreme interference channels with narrow band FM signals and high velocity portables. These results are contrary to the widespread belief that high performance blind adaptive array processing is not possible for AMPS with severe combinations of Doppler spread, angle spread, and interference power
Keywords :
adaptive equalisers; adaptive signal processing; array signal processing; cochannel interference; estimation theory; fading; frequency modulation; land mobile radio; mobile radio; multipath channels; radiofrequency interference; time-varying channels; AMPS; Doppler spread; SINR cost function; algorithm; angle spread; blind adaptive array processing; blind adaptive spatial equalization; cochannel interference; desired channels; equalizer performance; fast fading channels; high velocity portables; interference channels; interference power; multipath fading; narrow band FM signals; optimal time varying channel estimation; signal tracking; simulations; squared error equalizer cost functions; time varying vector channel estimation; update time interval; Adaptive equalizers; Array signal processing; Blind equalizers; Channel estimation; Cost function; Fading; Interchannel interference; Interference channels; Narrowband; Signal to noise ratio;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Global Telecommunications Conference, 1995. GLOBECOM '95., IEEE
Print_ISBN :
0-7803-2509-5
Type :
conf
DOI :
10.1109/GLOCOM.1995.500355
Filename :
500355
Link To Document :
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