Patent ID: 8095077

Claim:
A method of evaluating the fraction of the power that is attributable to a wanted signal, as opposed to extraneous signals, within a received signal acquired by a receiver from a plurality of transmission sources, the method comprising: a. populating a first version of an auto-covariance matrix of the received signal with entries obtained by way of calculating products of samples of the received signal with complex-conjugated samples of the received signal; and b. finding a value of said fraction that causes a second version of the received signal's auto-covariance matrix to be a good match to said first version; wherein: c. said second version is a weighted sum of: i) an auto-covariance matrix of the wanted signal, populated on the basis of channel impulse response estimate terms for a composite channel through which the wanted signal can be said to be received from said sources, and ii) a plurality of auto-covariance matrices, each relating to extraneous signals emitted by a respective one of said sources and each populated on the basis of channel impulse response estimate terms for the channel linking its respective source with the receiver; and d. at least some of the weights in the sum are functions of said fraction.