Blind channel estimation for MC-CDMA systems with long spreading codes

Authors:
Jung-Lang Yu;Chien-Ming Kuo;Chih-Chun Lin
Affiliations:
Department of Electronic Engineering, Fu Jen Catholic University, Taipei, Taiwan, Republic of China;Department of Electronic Engineering, Fu Jen Catholic University, Taipei, Taiwan, Republic of China;Department of Electronic Engineering, Fu Jen Catholic University, Taipei, Taiwan, Republic of China
Venue:
Signal Processing
Year:
2005

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Abstract

This paper develops the blind channel estimation for multicarrier code division multiple access (MC-CDMA) systems with long spreading codes. The channel impulse response plays an important role in estimation of the transmitted symbol. However, due to the long spreading codes, the time-varying effect makes the channel estimation difficult. The problem can be solved by utilizing the channel information matrix of the desired user which is computed by the second-order statistics of the despreading signal vector. It is analyzed that the novel channel information matrix is unbiased and is more efficient than that proposed by Liu [IEEE International Conference on Acoustics, Speech, and Signal Processing, 2000, ICASSP 2000, vol. 5, pp. 2909-2912] in the case of finite samples. With the channel information matrix, the channel impulse response can be estimated by the least-square method. Computer simulations show that the proposed method not only has smaller mean-square error of channel estimation but also requires fewer computations than Liu's method.