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Registered APPARATUS AND METHOD OF ESTIMATING CHANNEL CORRESPONDING TO CHANNEL DELAY SPREAD IN MOBILE COMMUNICATION SYSTEM
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APPARATUS AND METHOD OF ESTIMATING CHANNEL CORRESPONDING TO CHANNEL DELAY SPREAD IN MOBILE COMMUNICATION SYSTEM
- Inventors
- Bang Young Jo, 박윤옥, Sohn Kyung Yeol
- Application No.
- 11931188 (2007.10.31)
- Publication No.
- 20080137788 (2008.06.12)
- Registration No.
- 8275053 (2012.09.25)
- Country
- UNITED STATES
- Abstract
- The present invention relates to an apparatus and method of estimating a channel based on a channel delay spread in a mobile communication system. Pilot subcarriers are inserted between data subcarriers at predetermined intervals to estimate a channel at locations of the pilot subcarriers. An approximate channel delay spread value is estimated by using an autocorrelation value of a pilot signal. Then, a channel for data subcarriers between the pilot subcarriers is estimated by using a Wiener finite impulse response (FIR) filter that has a separate coefficient according to the estimated delay spread value. Accordingly, by changing the Wiener FIR filter coefficient according to the delay spread value of the channel, it is possible to estimate the channel so as to be adaptive for a change of the channel over time. Since the filter coefficients, which are calculated in advance, are used, it is possible to reduce the amount of calculation required when calculating the filter coefficients. As a result, an apparatus for estimating a channel can be easily achieved.