Title :
Subspace-Based Blind Channel Estimation in DS-CDMA Systems with Unknown Wide-Sense Stationary Interference
Author :
Zarifi, Keyvan ; Gershman, Alex B.
Author_Institution :
Commun. Syst. Group, Darmstadt Technol. Univ.
Abstract :
A new blind subspace-based channel and signature waveform estimation technique is proposed for DS-CDMA communication systems operating in the presence of unknown wide-sense stationary interference. Unlike the existing algorithms, our technique requires single receive antenna and is applicable to the general case of arbitrary transmitted symbol constellations. Necessary and sufficient conditions for identifiability of the proposed technique are derived. Closed-form expressions for the mean-squared error (MSE) of the estimated channel are obtained and verified by means of simulations
Keywords :
channel estimation; code division multiple access; matrix algebra; mean square error methods; radiofrequency interference; receiving antennas; spread spectrum communication; DS-CDMA communication systems; MSE; arbitrary transmitted symbol constellations; direct sequence code division multiple access; mean-squared error; signature waveform estimation technique; single receive antenna; subspace-based blind channel estimation; unknown wide-sense stationary interference; Blind equalizers; Closed-form solution; Covariance matrix; Interference; Multiaccess communication; Multiuser detection; Phase shift keying; Receiving antennas; Signal processing; Sufficient conditions;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on
Conference_Location :
Toulouse
Print_ISBN :
1-4244-0469-X
DOI :
10.1109/ICASSP.2006.1660920
