Partial Channel Quality Information Feedback in Multiuser Relay Networks Over Nakagami-m Fading
Date
2015
Authors
Lu, Yao
Yang, Nan
Elkashlan, Maged
Yuan, Jinhong
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Abstract
We propose a new partial feedback scheme in multiuser
relay networks (MRNs) where a source communicates with
K destinations via a relay. We focus on a practical network model
where orthogonal frequency division multiple access (OFDMA)
is adopted in the downlink and only limited feedback overhead
is supported in the uplink. For this model, we consider that the
OFDMA spectrum consists of MRB resource blocks (RBs). In the
proposed scheme, the destinations feed back the channel quality
information (CQI) for the best MFB RBs, instead of all MRB RBs,
to the source through the relay, which fulfills the requirement of
feedback overhead. Considering the highly versatile Nakagami-m
fading, we derive new closed-form expressions for the exact sum
rate for ideal CQI feedback and quantized CQI feedback. We
also derive the asymptotic sum rate expression for ideal CQI
feedback. We have some new findings to understand the impact
of network and channel parameters on the sum rate. First, a
more scattering fading environment with a lower m decreases
the sum rate for a small K, but increases the sum rate for a
large K. Second, the sum rate increases as MFB approaches MRB.
Third, the sum rate gap between ideal CQI feedback and quantized
CQI feedback increases when MFB or K increases. Fourth,
we demonstrate that the proposed partial feedback scheme
achieves almost the same sum rate as the full feedback scheme for
a large number of destinations.
Description
Keywords
Multiuser relay network, partial channel quality information feedback, opportunistic scheduling, orthogonal frequency division multiplex access, Nakagami-m fading
Citation
Collections
Source
IEEE Transactions on Wireless Communications
Type
Journal article
Book Title
Entity type
Access Statement
Open Access