ACTIVE SELF INTERFERENCE CANCELLATION TECHNIQUES IN FULL DUPLEX COMMUNICATION SYSTEMS- A SURVEY

In this paper we present a survey based on vast research done in the area of various important factors relating to full duplex communication revealing several facts. In fact these revelation has served to be vital in the future design of any full duplex communication system. The major problem or challenge faced in such a system was the interference caused from the transmitting antenna on the receiver antenna placed at the same node. The interference was termed as ' self interference'. Wireless transceivers nodes can select between transmit and receive functions on the same frequency band at different time ( Time Division Duplex-TDD) or they can transmit at the same time at different frequencies ( Frequency Division Duplex-FDD). Recently researchers have put forth a new radio system, that can operate full duplex over a single channel, that is transmitting and receiving at the same time on the same frequency band. This kind of system is overwhelmed by interference. Interference need to be reduced to the point where the receiver can detect even the weakest signal of interest. Several active interference cancellation techniques that can help in self interference reduction have been proposed. The in depth survey was helpful enough to come out with a novel solution to an antenna design based on passive suppression techniques using polarization and other diversity techniques so as to reduce the self interference problem