A Probe-and-Update Method for Tuning Analog Self-Interference Canceller in Full-Duplex Radio Systems
Journal
IEEE Communications Letters
Journal Volume
20
Journal Issue
10
Pages
2119-2122
Date Issued
2016-10
Author(s)
Abstract
Accurate self-interference (SI) cancellation is one of the main challenges for the implementation of full-duplex radio (FDR) systems. In this letter, we proposed a new algorithm, called, probe-and-update method (PUM), to tune the gains of a multi-tap analog SI cancellation filter for orthogonal frequency division multiplexing FDR systems. PUM performs a novel gain updating procedure based on the comparison of two consecutive measurements of the residual SI power, namely, the probe value. Via sufficient number of updates, PUM could approach the minimum average residual SI power. PUM is applicable in a multipath environment and no channel knowledge is needed in advance, which considerably facilitate the implementation. Simulation results show that PUM could achieve a reasonably low residual SI power down to 5.5 dB of the noise floor in a 20-MHz system.
Type
journal article