Incorporating self-interference suppression for full-duplex operation in opportunistic spectrum access systems

Inspired by recent developments in full-duplex (FD) communications, we consider an opportunistic spectrum access (OSA) network in which secondary users (SUs) are capable of partial/complete self-interference suppression (SIS). This enables them to operate in either simultaneous transmit-and-sense (T...

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Bibliographic Details
Published inIEEE transactions on wireless communications Vol. 14; no. 4; pp. 2180 - 2191
Main Authors Afifi, Wessam, Krunz, Marwan
Format Journal Article
LanguageEnglish
Published New York IEEE 01.04.2015
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Cognitive Radio
full-duplex
High definition video
Interference cancellation
Power control
self-interference cancellation
Sensors
spectrum awareness/efficiency tradeoff
Switches
Throughput
Wireless communication
self-interference cancellation
spectrum awareness/efficiency tradeoff
Cognitive radio
full-duplex
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Summary:Inspired by recent developments in full-duplex (FD) communications, we consider an opportunistic spectrum access (OSA) network in which secondary users (SUs) are capable of partial/complete self-interference suppression (SIS). This enables them to operate in either simultaneous transmit-and-sense (TS) or simultaneous transmit-and-receive (TR) modes, with the goal of achieving improved primary user (PU) detection and/or higher SU throughput. We first consider an overlay OSA setup, and we study the TS and TR modes. We also explore the spectrum awareness/efficiency tradeoff and determine an efficient adaptive strategy for the SU link. We then consider a spectrum underlay model, with the objective of optimizing SUs' transmission powers so as to maximize the sum-throughput of K FD secondary links subject to a PU outage constraint. Operating in an FD fashion is not always efficient for SUs. Hence, we propose an optimal policy for switching between FD and half-duplex. The criteria for this policy depend mainly on the SIS capabilities of SUs. Finally, we propose a mode selection algorithm for the switching process. Numerical results indicate that operating in the TS mode can reduce the PU outage probability by up to 100% compared with the classical listen-before-talk scheme.
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content type line 14
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2014.2382124