The design, development and implementation of a cross-polarization interference cancellation system for point-to-point Digital Microwave Radio systems

Digital Microwave Radio communications is not a new commercial theatre but is an area that is fostering several novel implementations of older ideas. The DragonWave application for Digital Microwave Radio is for use in the backhaul of high speed data and digitized voice communications. This implementation is available as a point-to-point radio link on various GigaHertz carrier frequencies operating at data rates upto 500 Mbps. Faced with demand from customers requiring doubling of data rates while not increasing the channel bandwidth, the use of orthogonally polarized channels has been incorporated. Such cross-polarized co-channel operation is not without its issues, one of which is environment induced cross-polarization interference (XPI). To reduce the effects of XPI on a DragonWave point-to-point radio link, an cross- polar interference cancellation (XPIC) system has been conceived and implemented The implementation of DragonWave´s XPIC feature meets or exceeds performance levels specified in ETSI EN 302-217-2-1 [1] standard as a result of to some unique interference-synchronization features (patent pending).