RF Self-Interference reduction techniques for compact full duplex radios

This paper describes three RF self-interference reduction techniques for full-duplex wireless links, which specifically target integration in compact radios. Concretely, a self-interference cancelling front-end, a dual-polarized antenna, and an electrical balance duplexer are proposed. Each technique offers specific benefits in terms of implementation density, selfinterference rejection, bandwidth and flexibility. Depending on their characteristics, they can be adopted in different next generation full-duplex applications and standards. All concepts are prototyped, and achieve at least 45dB of self-interference reduction over more than 10MHz bandwidth. Index Terms—Full-duplex wireless, self-interference, polarized antenna, electrical balance duplexer, analog cancellation

In-Band full-duplex transceiver technology for 5G mobile networks

In-band full-duplex is a promising air interface technique to tackle several of the key challenges of next generation (5G)mobile networks. Simultaneous transmission and reception in the same frequency band increases the throughput and spectral efficiency, and reduces the air interface delay. Its implementation in 5G systems, however, restrains the full-duplex transceiver design requirements. Two analog integrated circuit solutions are presented and evaluated in the frame of 5G applications. The first design is a self-interference cancelling front-end implemented in 65nm CMOS, and the second design is an electrical-balance duplexer implemented in 0.18μm RF SOI CMOS. Both designs are attractive in the context of 5G; they allow dense integration, are configurable to support alternative and legacy standards, are compatible with conventional antenna(s), and they provide an attractive full-duplex performance for wireless communication