Until recently, the ability to achieve simultaneous wireless transmission and reception over the same channel was deemed impossible, due to high self-interference on the receive chain. As a result, bidirectional communications using half-duplex (HD) devices is typically achieved by separating the forward and reverse links in time or frequency. This common practice was recently challenged by several studies, which for the first time demonstrated true full-duplex (FD) operation over the same channel. By employing a variety of conventional and new self-interference suppression (SIS) techniques, a reduction of up to 110 dB in self-interference was demonstrated on single-antenna devices, just enough to enable FD operation on WiFi systems. The impact of these successes on wireless network design and protocols is enormous, as evident by the intensive research activity in this domain.
展开▼
