Patent ID: 7031371

Claim:
A method of operating a spread-spectrum-based wireless communication system to efficiently utilize spectrum in the presence of multipath interference, comprising: dividing a stream of data-conveying symbols into a plurality of unspread substreams at a transmitter; generating a common spreading code at said transmitter; spreading, at said transmitter, each of said plurality of unspread substreams using said common spreading code to form a plurality of spread substreams, said spreading activity comprising a respective temporally offsetting application of said common spreading code to each of said plurality of unspread substreams so that said plurality of spread substreams correspond to said plurality of unspread substreams modulated by respective cyclic variations of said common code; performing a first time-frequency domain transformation on said plurality of unspread substreams at said transmitter prior to said spreading activity; combining, at said transmitter, said plurality of spread substreams to form a composite signal; wirelessly transmitting, from said transmitter, a communication signal formed from said composite signal; receiving said received communication signal at a receiver; despreading said communication signal at said receiver using a mismatched filter to generate a baseband signal; and performing a second time-frequency domain transformation on said communication signal at said receiver prior to said despreading activity.