Patent ID: 9337885
Filing Date: 2016-05-10
CPC Classification: H04B,H04L

Claim Text:
1. A system for hybrid self-interference cancellation comprising: a transmit coupler, communicatively coupled to an RF transmit signal of a wireless communication system, that samples the RF transmit signal to create a sampled RF transmit signal having a first RF carrier frequency; a frequency downconverter that converts the sampled RF transmit signal to an IF transmit signal having an IF carrier frequency, wherein the IF carrier frequency is less than the first RF carrier frequency; an IF self-interference canceller that transforms the IF transmit signal to an IF self-interference cancellation signal; a frequency upconverter that converts the IF self-interference cancellation signal to an IF-sourced RF self-interference signal; an RF self-interference canceller that transforms the sampled RF transmit signal to an RF self-interference cancellation signal; a digital self-interference canceller that transforms a digital transmit signal of the wireless communication system to a digital self-interference cancellation signal; and a receive coupler, communicatively coupled to an RF receive signal of the wireless communication system, that combines the RF self-interference cancellation signal and the IF-sourced RF self-interference cancellation signal with the RF receive signal.