Phase noise cancellation performance in self-heterodyning transceivers for wireless backhaul applications

This paper presents a novel system architecture for small cell base stations with integrated millimeter-wave wireless backhaul. In contrast to existing systems, the data signal on the wireless backhaul uses the same 3GPP compliant signal than on the access link serving the users. The small cell omits the 60GHz local oscillator source completely by using the self-heterodyning mixing approach and transmits only a suppressed carrier. Measurements of a single-carrier WCDMA signal on a simplified setup with lower carrier frequency demonstrated that due to successful phase noise cancellation the 3GPP ACLR and EVM requirements are easily met, even with 15dB dynamic on the backhaul link. Moreover, the required broadband capability is proven using an LTE signal with 20MHz bandwidth.