Method and circuit for detecting guard intervals in OFDM communication systems
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United States of America Patent
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Jun 30, 2009
Grant Date -
Jul 6, 2006
app pub date -
Dec 14, 2005
filing date -
Jan 3, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A circuit for detecting a guard interval in an orthogonal frequency division multiplication (OFDM) communication system, using two successive autocorrelation calculations for a received sample train. The circuit determines a guard interval by calculating the maximum correlation value first autocorrelation calculation step (delaying an OFDM signal by the length of valid data N, the useful data duration); and a second autocorrelation calculation step (delaying the OFDM signal by a guard interval detection period (N+G1), the sum of the valid data length (N) and the minimum guard interval (GI)). Performing two autocorrelation calculation steps provides improved detection of the guard interval, being free from noises and distortions and producing the maximum correlation value and position more distinctly.
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