Method and circuit for detecting guard intervals in OFDM...

Details Method and circuit for detecting guard intervals in OFDM... Method and circuit for detecting guard intervals in OFDM...

2005-12-14

2009-06-30

Pathak, Sudhanshu C (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S260000, C375S354000

Reexamination Certificate

active

07555072

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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