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Adaptive Channel Estimation Algorithm for DVB-T  

Kim, Seung-Hwan (서강대학교 전자공학과)
Lee, Jin-Beom (삼성전자 정보통신총괄)
Lee, Jin-Yong (서강대학교 전자공학과)
Kim, Young-Lok (서강대학교 전자공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.6A, 2008 , pp. 676-684 More about this Journal
Abstract
In digital video broadcasting-terrestrial (DVB-T), which is the European digital terrestrial television standard, the orthogonal frequency division multiplexing (OFDM) has been adopted for signal transmission. The main reasons using OFDM are to increase the robustness against the frequency selective fading and impulse noise, and to use available bandwidth efficiently. However, channel variation within an OFDM symbol destroys orthogonality between subcarriers, resulting in inter-carrier interference (ICI), which increases an error floor in proportional to maximum Doppler spread. This paper provides an ICI analysis in both time and frequency domains while existing literatures analyze the ICI effects mainly in frequency domain and proposes the algorithms that estimate the channel impulse response and channel variation using least square (LS) algorithm which is the most simple channel estimation technique. And we propose adaptive channel estimation algorithm that estimates the velocity of terminals. The simulation results show that proposed algorithm has similar performance with about 1.5% computational complexity of noise and ICI reduction LS algorithm in low speed environments.
Keywords
DVB-T; OFDM; Doppler; ICI; Channel estimation;
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