Patent ID: 7274757
Filing Date: 2007-09-25
Classification: H04L

Abstract:
1. A method in an OFDM direct conversion receiver, the method including: receiving OFDM symbols, including an initial minimum number of short preamble symbols; first generating autocorrelated signal values based on successively autocorrelating consecutive samples from consecutive OFDM symbols, each of the short preamble symbols having a first prescribed number of samples and each autocorrelated signal value generated based on autocorrelating a second number of adjacent samples, the second number twice the first prescribed number; second generating a median autocorrelation value from at least a prescribed minimum number of the autocorrelated signal values having been generated from the initial minimum number of short preamble symbols; and detecting a symbol boundary, identifying an end of the short preamble symbols, based on detecting the autocorrelated signal values having passed below a threshold that is based on the median autocorrelation value.