On the Energy Efficiency in Multi-user Multi-relay Coded Network
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Date
2016
Authors
Qi, Nan
Xiao, Ming
Tsiftsis, Theodoros A.
Cao, Phuong L.
Skoglund, Mikael
Li, Lixin
Journal Title
Journal ISSN
Volume Title
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Abstract
In this paper, the energy efficiency (EE) of a
cooperative diversity system with maximum diversity network
coding (MDNC) is studied. In the considered system, channel
state information (CSI) is only available at the receivers for all
the channels. We formulate the problem of maximizing the EE
under the constraint on the outage probability. The problem
is NP-hard due to the non-convexity of the outage probability
function and the nonlinear fractional structure of the introduced
EE. To solve the optimization problem efficiently, first, the outage
probability function is tightly approximated as a log-convex form
in the high signal-to-noise ratio (SNR) region. Further, based on
the fractional programming, we transform the introduced EE
into a subtractive-form, which is proved to be a convex form. The
tradeoff between outage probability and EE is given. The results
show that our power allocation (PA) policy can substantially
increase the EE. We show that EE can be increased if more
relays forward the messages. Additionally, we also investigate
the effect of the relay locations on the EE and demonstrate that
the increase in the transmission distance in the first hop causes
the loss of the EE. The loss can be reduced by our PA policy
Description
Keywords
Energy Efficiency, Coded Network
Citation
Nan Qi, Ming Xiao, Theodoros A. Tsiftsis, Phuong L. Cao, Mikael Skoglund, and Lixin Li; 2016; On the Energy Efficiency in Multi-user Multi-relay Coded Network; 23rd International Conference on Telecommunicationsl; http://nur.nu.edu.kz/handle/123456789/1686