INTERFERENCE CANCELLATION AND IMPROVED SIGNAL-TO-NOISE RATIO CIRCUITS, SYSTEMS, AND METHODS

摘要

Interference cancellation for wideband and narrowband communications systems is provided without apriori knowledge of statistical information about an interfering signal. In one embodiment a demodulator circuit can operate in an environment where a “no lock” situation would normally occur to remove the interference and acquire signals in low signal-to-noise ratio conditions and high signal-to-interference ration conditions. In other embodiments, performance is improved by introducing statistics of the interfering signal, and these statistics regarding the communications channel and interference properties (i.e., characteristics of the interfering signal) can be adaptive or “learned” in other embodiments.

主权项

1. A demodulation circuit, comprising:
an interference estimation circuit adapted to receive an input signal and adapted to generate an interference estimation signal from the input signal; and an adaptive filtering circuit coupled to the interference estimation circuit and operable to perform spectral inversion on the estimation signal to obtain an inverted signal, the inverted signal applicable to the input signal to substantially cancel interference contained in the input signal.