Effective Capacity of Two-Hop Wireless Communication Systems

• Published in: IEEE transactions on information theory Vol. 59; no. 2; pp. 873 - 885
• Main Authors: Deli Qiao, Gursoy, M. C., Velipasalar, S.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-02-2013; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Access methods and protocols, osi model; Applied sciences; Bandwidth; Buffer violation probability; effective capacity; Exact sciences and technology; Fading; fading channels; full-duplex and half-duplex relaying; Information theory; Information, signal and communications theory; Numerical models; Operation, maintenance, reliability; Probability distribution; Quality of service; quality of service (QoS) constraints; Relays; Signal to noise ratio; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Teleprocessing networks. Isdn; Transmission and modulation (techniques and equipments); two-hop wireless links; Wireless communication; Wireless communications; Fading channels; Overflow(computer arithmetics); Performance evaluation; Fading; effective capacity; Relaying; Relay; Wireless telecommunication; Transmission protocol; Information rate; Buffer violation probability; quality of service (QoS) constraints; Buffer system; Information transmission; Duplex process; Time sharing system; full-duplex and half-duplex relaying; Telecommunication system; Routing protocols; two-hop wireless links; Service quality; Signal to noise ratio
• ISSN: 0018-9448; 1557-9654
• DOI: 10.1109/TIT.2012.2219850

A two-hop wireless communication link in which a source sends data to a destination with the aid of an intermediate relay node is studied. It is assumed that there is no direct link between the source and the destination, and the relay forwards the information to the destination by employing the decode-and-forward scheme. Both the source and intermediate relay nodes are assumed to operate under statistical quality of service (QoS) constraints imposed as limitations on the buffer overflow probabilities. The maximum constant arrival rates that can be supported by this two-hop link in the presence of QoS constraints are characterized by determining the effective capacity of such links as a function of the QoS parameters and signal-to-noise ratios at the source and relay, and the fading distributions of the links. The analysis is performed for both full-duplex and half-duplex relaying. Through this study, the impact upon the throughput of having buffer constraints at the source and intermediate relay nodes is identified. The interactions between the buffer constraints in different nodes and how they affect the performance are studied. The optimal time-sharing parameter in half-duplex relaying is determined, and performance with half-duplex relaying is investigated.