Title :
Channel Identifiability for Blind Subspace-Based Channel Estimator in Uplink MC-CDMA Systems
Author :
Thiagarajan, L.B. ; Attallah, S. ; Liang, Y.-C. ; Abed-Meraim, K.
Author_Institution :
Inst. for Infocomm Res., Singapore
Abstract :
Subspace-based channel impulse response (CIR) estimators have been proposed for multi carrier code division multiple access (MC-CDMA) systems. Channel identifiability conditions have been formulated for blind (non-data-aided) CIR estimators. These identifiability conditions require the channel filtering matrix to satisfy certain rank conditions. In this paper, the generalized uplink MC-CDMA system model is analyzed in detail. It will be shown that each user´s signal subspace dimensionality is independent of the user´s spreading code and CIR. Furthermore, for any realization of the users´ CIR, the channel identifiability is established by only imposing a simple rank condition on the users´ spreading codes.
Keywords :
channel estimation; code division multiple access; filtering theory; matrix algebra; transient response; MC-CDMA system; blind subspace-based channel estimator; channel filtering matrix; channel identifiability; channel impulse response; Base stations; Communications Society; Fading; Filtering; Frequency conversion; Frequency domain analysis; Multiaccess communication; Multicarrier code division multiple access; OFDM; Telecommunications;
Conference_Titel :
Communications, 2008. ICC '08. IEEE International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2075-9
Electronic_ISBN :
978-1-4244-2075-9
DOI :
10.1109/ICC.2008.115
