Analogue processing makes cancelling self-interference achievable
The notion of a transceiver that can transmit and receive at the same time and in the same frequency band has long been considered a pipe dream. Severe levels of self-interference during transmission make the signal-to-noise ratio too low for reliable full duplex communications. However, a Cambridge Wireless event taking place on 8th July in the University of Bristol’s School of Chemistry will showcase recent advances in analogue and digital signal processing that make cancelling this self-interference an achievable reality.
It is a breakthrough that has important ramifications for spectral efficiency by potentially doubling the capacity of wireless systems. This could also allow unrestricted international roaming in LTE phones, as well as being the preferred choice for operators when upgrading to 5G networks.
When it comes to duplexing for devices such as smartphones and tablets, self-interference cancelling technology needs to meet the rigorous low cost requirements of handset applications. Leo Laughlin, a PhD student at the University of Bristol’s EPSRC Centre for Doctoral Training in Communications and opening speaker at the event, will present a prototype of the full duplex transceiver with electrical balance duplexing that allows transmission and reception from a single antenna.
The architecture was designed and built by Laughlin along with MSc student Chunqing Zhang, supervisors Professor Mark Beach and Dr Kevin Morris from the University’s Communication Systems and Networks research group, and CW Radio SIG Champion, Professor John Haine of u-blox.
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