High capacity wideband co-site co-channel interference cancellation system for enhancing wireless communications
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A high capacity wideband co-site co-channel interference cancellation system (ICS), is proposed and experimentally demonstrated. The demonstrated cancellation system subtracts the in-band wideband interfering signal from the received signal, such that the weak signal of interest (SOI) can be recovered. Our approach takes the good parts of both an electrical and an optical system to achieve deep cancellation with wide operation bandwidth. This proposed architecture is capable of canceling both line of sight and multipath interference. A 30-dB cancellation over 5.5 GHz and more than 50-dB cancellation over 150 MHz are experimentally obtained. Furthermore, to enable dynamic co-site interference cancellation at GHz speed, a semiconductor-optical-amplifiers (SOA) based ultrafast tunable time delay has been developed and incorporated into the ICS. Lastly, a novel microwave photonic mixer is demonstrated using polarization rotation in SOA and can be employed as the front end of the ICS for enhancing wireless transmission capacity.