A Probe-and-Update Method for Tuning Analog Self-Interference Canceler in Full-Duplex Radio Systems

作者：Tsai Tsung Yu^*; Wu Tung En; Tsai Zsehong

来源：IEEE Communications Letters, 2016, 20(10): 2119-2122.

DOI：10.1109/LCOMM.2016.2594254

• Full-duplex radio
• analog cancellation filter
• OFDM

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.

• 出版日期2016-10