Patent Document ID: 4186349
Application ID: 05864768
Patent Flag: 1

Claim One:
1. A receiver apparatus for extracting a data signal from a received signal which has included therein an interfering noise signal, comprising in combination: (a) means for recovering a carrier signal from the received signal, the recovered carrier signal corresponding to the carrier signal modulated to carry the data signal, (b) means for mixing the recovered carrier signal with the received signal to produce a baseband signal which includes both the data signal and the noise signal, (c) means for generating a recovered modulated carrier signal by mixing the data signal with the recovered carrier signal, (d) means for deriving the noise signal by mixing the recovered modulated carrier signal with the received signal, (e) means for generating a noise correlation signal by operating on the derived noise signal, the noise correlation signal representing an approximation of the correlation of the noise signal over a sample period having a predetermined duration, (f) means for generating a squared mean signal by operating on the baseband signal, the squared mean signal representing an approximation of the square of the mean of the noise signal over the sample period, (g) means for generating a covariance noise signal by producing the difference of the noise correlation signal and the squared mean signal, (h) means for generating a noise statistic signal derived from a combination of the covariance noise signal, the data signal, and a noise figure signal representing the receiver apparatus noise figure, the noise statistic signal adapted to reduce the interfering effect of the noise signal when the noise statistic signal is mixed with the baseband signal, and (i) means for mixing the baseband signal with the noise statistic signal to produce the data signal having the noise signal essentially removed therefrom.