Patent ID: 6998908

Claim:
An adaptive interference cancellation receiving system using synthesizer phase accumulation comprising: a coupler coupled to a transmitter and for sampling an undesired transmit signal; an adaptive interference canceller (AIC) module connected to the coupler and for varying phase and amplitude of the sampled undesired transmit signal to provide a cancellation output signal wherein said adaptive interference canceller module comprises a modified receiver module having a modulated fractional divider (MFD) frequency synthesizer providing a variable phase offset for varying the phase and having an attenuator for varying the amplitude of the sampled undesired transmit signal; a receive antenna for receiving receive signals and the undesired transmit signal; a first summing circuit connected to the receive antenna and the adaptive interference module and for summing the receive signals, the received undesired transmit signal, and the cancellation output signal to cancel the received undesired transmit signal; and an AIC controller module coupled to the first summing circuit output and to detect a null in the undesired transmit signal, to generate a cancellation feedback signal and to provide the cancellation feedback signal to the AIC module to vary the phase and amplitude of the cancellation output signal.