Patent ID: 8031784

Claim:
A system, comprising: a differential demodulation module that differentially demodulates modulated signals to generate differentially demodulated signals, wherein the modulated signals include subcarriers, wherein every P th one of the sub-carriers is modulated with a preamble bit, where P is an integer greater than or equal to 1, and wherein the differential demodulation module generates the differentially demodulated signals by multiplying a Q th one of the modulated signals by a complex conjugate of a (Q+P) th one of the modulated signals, where Q is an integer greater than or equal to 1; a correlation module that generates correlation values based on a correlation of the differentially demodulated signals with derived preamble sequences, wherein each one of the correlation values has a real part and an imaginary part; and a control module that selects one of the correlation values having a largest real part and that detects a preamble sequence in the modulated signals upon determining that the largest real part is greater than or equal to a predetermined threshold.