Title :
A novel channel identification method for downlink multicarrier CDMA systems
Author :
Escldero, C.J. ; Iglesia, Daniel I. ; Casteda, L.
Author_Institution :
Dept. de Electron y Sistemas, Univ. de La Coruna, Spain
Abstract :
This paper presents a new blind channel identification method for downlink multicarrier CDMA (MC-CDMA) systems. This technique uses subspace decomposition for channel identification and exploits the orthogonality property between the noise subspace and the received user codes to obtain a channel identification algorithm. It is shown that in order to increase the number of simultaneous users, and to still have a good estimation of the channel, a modification of the MC-CDMA system has to be considered by using codes larger than the spreading gain. The performance of this algorithm is analyzed by deriving a theoretical expression of the mean square error (MSE) estimation. This expression is compared with numerical results of some computer simulations to illustrate the validity of the analysis. The paper also introduces a linear detector for this environment
Keywords :
code division multiple access; land mobile radio; mean square error methods; multipath channels; multiuser channels; parameter estimation; radio links; signal detection; spread spectrum communication; MSE estimation; blind channel identification; channel estimation; channel identification algorithm; computer simulations; downlink multicarrier CDMA systems; linear detector; long codes; mean square error estimation; multipath propagation; noise subspace; orthogonality property; performance; received user codes; spreading gain; subspace decomposition; Algorithm design and analysis; Computer simulation; Detectors; Downlink; Estimation error; Mean square error methods; Modulation coding; Multiaccess communication; Multicarrier code division multiple access; Performance analysis;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2000. PIMRC 2000. The 11th IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-6463-5
DOI :
10.1109/PIMRC.2000.881399
