2 research outputs found
Rate Performance of Adaptive Link Selection in Buffer-Aided Cognitive Relay Networks
We investigate the performance of a two-hop cognitive relay network with a
buffered decode and forward (DF) relay. We derive expressions for the rate
performance of an adaptive link selection-based buffered relay (ALSBR) scheme
with peak power and peak interference constraints on the secondary nodes, and
compare its performance with that of conventional unbuffered relay (CUBR) and
conventional buffered relay (CBR) schemes. Use of buffered relays with adaptive
link selection is shown to be particularly advantageous in underlay cognitive
radio networks. The insights developed are of significance to system designers
since cognitive radio frameworks are being explored for use in 5G systems.
Computer simulation results are presented to demonstrate accuracy of the
derived expressions.Comment: This work has been submitted to the IEEE Sarnoff 2016 conference for
possible publicatio
Framework for Discrete Rate Transmission in Buffer-Aided Underlay CRN With Direct Path
In this paper, a buffered decode and forward (DF) relay based three-node
underlay cooperative cognitive relay network (CRN) is considered with a direct
path to the destination. The source and the relay use multiple rates, and joint
rate and link selection are performed to maximize throughput. Optimum link and
rate selection rules are evolved that ensure buffer stability, and expressions
are derived for the throughput assuming peak power and peak interference
constraints on the transmit power of the secondary nodes. The expressions are
written in a manner that yields useful insights on buffer stability and role of
the direct link on performance. A scheme in which the direct link signal is
combined with the relayed signal is also considered, and it is demonstrated
that it offers additional improvement in performance only in some scenarios.
Computer simulations have been presented to verify the accuracy of derived
expressions.Comment: This work has been submitted to an IEEE journal for possible
publication. Copyright may be transferred without prior notice, after which
this version may no longer be accessibl