By Topic

An Efficient Relay–Destination Selection Scheme for Multiuser Multirelay Downlink Cooperative Networks

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Marco Antonio Beserra de Melo ; Federal University of Ceará, Fortaleza, Brazil ; Daniel Benevides da Costa

In this correspondence, we propose an efficient low-complexity relay-destination selection scheme for multiuser multirelay downlink cooperative networks comprised of one source node (base station), L destination nodes (mobile terminals), and N relay nodes. Our scheme first selects the best destination node based on the channel quality of the direct links and then selects the best relay that yields the best path from the source to the selected destination. Assuming both decode-and-forward (DF) and amplify-and-forward (AF) relaying strategies, the outage performance of the considered system is studied. Closed-form expressions for the outage probability are derived and validated by means of Monte Carlo simulations. For the AF case, both variable-gain relaying and fixed-gain relaying are examined. In our analysis, the source node may be equipped with either a single antenna or M multiple antennas. An asymptotic analysis is carried out, and it reveals that, regardless of the relaying strategy employed, the diversity order reduces to L + N for the single-antenna source case, whereas it is equal to ML + N for the multiple-antenna source case. The effects of the number of relay and destination nodes on the system performance and its influence on the best relay position are examined. In addition, a tradeoff concerning the system performance and spectral efficiency is observed when multiple antennas are employed at the base station. More specifically, on one hand, by increasing the number of antennas, the outage performance is increased. On the other hand, the system loses in terms of spectral efficiency.

Published in:

IEEE Transactions on Vehicular Technology  (Volume:61 ,  Issue: 5 )