Patent ID: 7356072

Claim:
A communication system comprising: a direct sequence spread-spectrum demodulator that receives first and second signals and that correlates a spreading code with a preamble of each data packet to produce a spreading codeword including a predetermined number of chips; and a signal quality measurement device that is responsive to the direct sequence spread-spectrum demodulator, that measures signal quality values corresponding to each of the first and second signals for each data packet after correlation with the spreading code and that selects one of said first and second signals on the basis of the measured signal quality values, wherein the signal quality values are computed in accordance with: SQ j = ( ï˜ƒ y peak ï˜„ ï˜ƒ âˆ‘ i = 0 N â¢ y i - 2 â¢ â¢ y peak ï˜„ ) where N is a predetermined number of samples to be extracted for each spreading codeword, y k is a value corresponding to the k th sample for spreading codeword symbol y, y peak is the maximum of all values of y k for symbol y, and SQ j =the signal quality measurement for the j th signal.