Adaptive-Rate Transmission With Opportunistic Scheduling in Wireless Networks

• Published in: IEEE transactions on vehicular technology 2013-03, Vol.62 (3), p.1409-1415
• Main Authors: Yufeng Wang, Sankar, R., Morgera, S.
• Format: Article
• Language: English
• Subjects: Adaptive systems; Applied sciences; Convertors; Cooperative relaying; Delay; Detection, estimation, filtering, equalization, prediction; Electrical engineering. Electrical power engineering; Electrical machines; Exact sciences and technology; Information, signal and communications theory; Interference; opportunistic scheduling; Organization and planning of networks (techniques and equipments); Receivers; Relays; Signal and communications theory; Signal to noise ratio; Signal, noise; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Throughput; Transmission and modulation (techniques and equipments); two-hop communication
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2012.2228512

In this paper, we propose an adaptive-rate transmission scheme with opportunistic scheduling in a two-hop relay network over a Rayleigh fading environment. We assume that only channel state information (CSI) at receivers is available in a decentralized network, where n source-to-destination pairs are completely independent and m half-duplex relays cooperate by exchanging their selected source IDs at the beginning of the two-hop transmission. In the limit of large n and fixed m , the system throughput of the scheme scales as ( m /2)log log n . It is shown that this is the same achievable scaling even with perfect CSI assumptions at transmitters and full cooperation among nodes. Furthermore, it is shown that the optimal scaling of m is Θ(log n ), under which a linear increase in throughput with m is obtained. A closed-form delay expression of the proposed scheme is also presented.