Digitally Controlled Analog Wideband Interference Cancellation for In-Device Spectrum Sharing and Aggregation

In this paper, we present a feasibility of wideband analog self-interference cancellation with a newly proposed digitally controlled analog adaptive filter. We analyze the key existing issues and concerns in analog interference cancellation and propose novel solutions to cancel the self-interference...

Full description

Saved in:
Bibliographic Details
Published in:IEEE journal on selected areas in communications 2016-11, Vol.34 (11), p.2838-2850
Main Authors: Insoo Hwang, Bongyong Song, Cong Nguyen, Soliman, Samir S.
Format: Article
Language:English
Subjects:
1-tap analog adaptive filter
Adaptive filters
Adaptive systems
Agglomeration
Analog circuits
analog interference cancellation
Broadband
Cancellation
Codes
Computer simulation
Delays
Feasibility studies
Gain
Interference
Interference cancellation
Radio coexistence
Receivers
self-interference cancellation
spectrum sharing
Wideband
Wireless communication
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this paper, we present a feasibility of wideband analog self-interference cancellation with a newly proposed digitally controlled analog adaptive filter. We analyze the key existing issues and concerns in analog interference cancellation and propose novel solutions to cancel the self-interference with a simple 1-tap cancellation circuit. The proposed solution conducts a blind estimation of optimal analog filter coefficients in the digital domain without requiring a pilot signal. We present an end-to-end system analysis and 1-tap adaptive filter circuit analysis to show the feasibility of wideband cancellation. We then propose a few novel blind coefficient estimation algorithms and show their cancellation performance by both simulations and measurements from an actual prototype. The results suggest that our self-interference approach enables the simultaneous operation of the licensed and unlicensed technologies in the adjacent spectrum within a single device, which, in turn, facilitates graceful spectrum sharing and bandwidth aggregation between the licensed and unlicensed technologies.
ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2016.2614949