Patent ID: 9712313
Date: 2017-07-18
CPC Classifications: H04B,H04L

Claim:
1. A system for multi-peak filter-based analog self-interference cancellation comprising: a transmit coupler, communicatively coupled to an analog transmit signal of a communication system, that samples the analog transmit signal to create a sampled analog transmit signal; an analog self-interference canceller, comprising a first signal divider, first and second filters, first, second, and third scalers, and a first signal combiner, wherein the first signal divider splits the analog transmit signal into first, second, and third signal paths; wherein the first filter filters the first signal path and the first scaler scales the first signal path to create a first analog self-interference signal component; wherein the second filter filters the second signal path and the second scaler scales the second signal path to create a second analog self-interference signal component; wherein the third signal path is unfiltered and the third scaler scales the third signal path to create a third analog self-interference signal component; wherein the first filter has a single peak centered at a first frequency; wherein the second filter has exactly two peaks centered at a second frequency and a third frequency respectively; wherein the first frequency is twice the second frequency; wherein the third frequency is three times the second frequency; wherein the first signal combiner combines the first, second, and third analog self-interference signal components to form a first analog self-interference cancellation signal; a receive coupler, communicatively coupled to an analog receive signal of the communication system, that combines the first analog self-interference cancellation signal with the analog receive signal.