Patent ID: 7760823
Filing Date: 2010-07-20
Classification: H04B,H04L,H04W

Abstract:
1. A method for detecting a packet in multiple signals received in parallel from at least two transmission antennas, the method being characterized by steps of: computing the power-normalized auto-correlations of the received signals tuned on the periodicity of short training symbols, said short training symbols having time periods shorter than one OFDM symbol; determining whether the sum of the moduli of the power-normalized, auto-correlation exceeds a first predetermined threshold; upon a determination that the sum of the moduli of a power-normalized, auto-correlation exceeds the first predetermined threshold, computing the cross-correlations between the received signals and the aperiodic sequences in a selected time window, said time window sliding in time for a quantity larger than the variance of the first predetermined threshold crossing instant; computing the maximum value of the sum of the moduli of the cross-correlations; determining whether the maximum value of the sum of the moduli of the cross-correlations exceeds a second predetermined threshold; and upon a determination that the maximum value of the sum of the moduli of the cross-correlations exceeds a second predetermined threshold, identifying a packet as received.