Patent ID: 7386032

Claim:
A method of suppressing interference in a spread spectrum receiver, the receiver being configured to demodulate a first spread spectrum signal in the presence of a second, potentially interfering spread spectrum signal, the first and second spread spectrum signals having respective first and second spreading codes, said first and second spreading codes being substantially mutually orthogonal, the method comprising: despreading a first multipath component of said first spread spectrum signal; estimating an interference contribution from a second multipath component of said second signal to said first multipath component of said first signal; applying a cross-correlation to said estimated interference contribution to determine a symbol-level interference estimate, said applied cross-correlation comprising a cross-correlation between offset said first and second spreading codes, said first and second spreading codes being offset relative to one another by a time difference between said first and second multipath components; and suppressing said symbol-level interference estimate from said despread first spread spectrum signal.