Patent ID: 7991077
Filing Date: 2011-08-02
Classification: H04L

Abstract:
1. A system, comprising: a differential demodulation module that (i) receives modulated signals from R antennas and (ii) differentially demodulates the modulated signals to generate differentially demodulated signals, where R is an integer greater than or equal to 1; a summing module that sums the differentially demodulated signals to generate a combined signal; and a correlation module that (i) correlates the combined signal with derived preamble sequences and (ii) generates correlation values based on the correlation, wherein the derived preamble sequences are derived from preamble sequences, and wherein (i) each bit of one of the derived preamble sequences has a first state when a corresponding bit and a bit adjacent to the corresponding bit in a corresponding one of the preamble sequences have opposite states, and (ii) the each bit has a second state when the corresponding bit and the bit adjacent to the corresponding bit have the same state.