Title :
Effect of Channel Estimation Errors on Turbo Equalization in ST Block Coded CDMA Downlink
Author :
Chandika, Kapila ; Wavegedara, B. ; Bhargava, Vijay K.
Author_Institution :
Dept. of Electr. & Comput. Eng., British Columbia Univ., Vancouver, BC
Abstract :
Space-time (ST) block coding based transmit diversity is considered in the third generation mobile communication standards for wideband-CDMA downlink transmission. On the other hand, turbo equalization can be used to enhance the wireless system performance. Hence, recently we proposed a minimum mean-square error (MMSE)-based turbo equalization scheme for the ST block coded CDMA downlink. In the proposed scheme, we assumed that perfect channel information is available at the receiver. However, in practice, channel coefficients are unknown to the receiver and have to be obtained through channel estimation. In this paper, we investigate the effect of the channel estimation errors on the MMSE-based turbo equalization in the downlink of ST block coded CDMA systems. It is demonstrated through simulations that substantial performance improvements can be obtained using the MMSE-based turbo equalization for moderate-to-high channel estimation quality
Keywords :
3G mobile communication; channel estimation; code division multiple access; diversity reception; equalisers; mean square error methods; radio links; radio receivers; space-time codes; turbo codes; wireless channels; MMSE; ST; channel estimation errors; minimum mean-square error; receiver; space-time block coding; third generation mobile communication standards; transmit diversity; turbo equalization; wideband-CDMA downlink transmission; 3G mobile communication; Block codes; Channel estimation; Communication standards; Covariance matrix; Downlink; Equalizers; Fading; Multiaccess communication; Transmitters;
Conference_Titel :
Industrial and Information Systems, First International Conference on
Conference_Location :
Peradeniya
Print_ISBN :
1-4244-0322-7
DOI :
10.1109/ICIIS.2006.365751
