A Channel Estimation Scheme using Early-late Doppler Compensator in uplink WCDMA system 


Vol. 27,  No. 1, pp. 90-98, Jan.  2002


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  Abstract

To increase system capacity in WCDMA receiver, the coherent detection is an essential technology for recovering transmitted symbols correctly. For coherent detection, an accurate and fast channel estimation is required. In next generation mobile communication system, high frequency carriers are used, and high data rate services are provided for subscribers having high mobility. In this communication environment, however, the rapidly-changing doppler frequency degrades the quality of the transmitted signal a lot. In WCDMA system, the channel estimation is conducted using pilot channel and/or pilot symbols which are known to both transmitter and receiver. Some existing channel estimation algorithms utilize these information quite well, but the performance of channel estimation gets very poor in a complicated fading channel distorted by the doppler effect. In this paper, we propose a new channel estimation algorithm combining an early-late doppler compensator so that the doppler effect and the fading characteristics are compcnsated at the same time. By computer simulation, the proposed algorithm proved to be a much more efficient channel estimation method in the fast fading channel, even at reasonably low Eb/No.

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  Cite this article

[IEEE Style]

J. Choi and N. Kim, "A Channel Estimation Scheme using Early-late Doppler Compensator in uplink WCDMA system," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 1, pp. 90-98, 2002. DOI: .

[ACM Style]

Jung-Hyun Choi and Nak-Myeong Kim. 2002. A Channel Estimation Scheme using Early-late Doppler Compensator in uplink WCDMA system. The Journal of Korean Institute of Communications and Information Sciences, 27, 1, (2002), 90-98. DOI: .

[KICS Style]

Jung-Hyun Choi and Nak-Myeong Kim, "A Channel Estimation Scheme using Early-late Doppler Compensator in uplink WCDMA system," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 1, pp. 90-98, 1. 2002.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880