Cooperative Communication Protocol Designs Based on Optimum Power and Time Allocation

Cooperative communication has emerged as a new wireless network communication concept, in which parameter optimization such as power budget and time allocation plays an important role in cooperative relaying protocol designs. While most existing works on cooperative relaying protocol designs conside...

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Veröffentlicht in:	IEEE transactions on wireless communications Jg. 13; H. 8; S. 4283 - 4296
Hauptverfasser:	Zijian Mo, Weifeng Su, Batalama, Stella, Matyjas, John D.
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	New York, NY IEEE 01.08.2014 Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:	Access methods and protocols, osi model Allocations Applied sciences Approximation methods Channels Design engineering Detection, estimation, filtering, equalization, prediction Exact sciences and technology Farming Information, signal and communications theory Mapping Optimization Outages Protocol Protocols Radiocommunications Random variables Relay Relaying Relays Resource management Signal and communications theory Signal, noise Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Teleprocessing networks. Isdn Transmission and modulation (techniques and equipments) Transmitters. Receivers Wireless networks Cooperative communications optimum time and power allocation wireless networks decode-and-forward (DF) relaying outage probability Performance evaluation Relaying Parameter estimation Relay Wireless telecommunication Transmitter Mapping Power allocation Time variation Optimization Coding Channel estimation Routing protocols Outage Transmission protocol Cooperative systems Theoretical study Time domain method Telecommunication network Integrated design Wireless network Numerical simulation
ISSN:	1536-1276, 1558-2248
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Zusammenfassung:	Cooperative communication has emerged as a new wireless network communication concept, in which parameter optimization such as power budget and time allocation plays an important role in cooperative relaying protocol designs. While most existing works on cooperative relaying protocol designs considered equal-time allocation scenario, i.e., equal time duration is assigned to each source and each relay, in this work we intend to design and optimize cooperative communication protocols by exploring all possible variations in time and power domains. We consider a cooperative relaying network in which no channel state information (CSI) is available at the transmitter side and the protocol optimization is based on channel statistics (i.e., mean and variance) and it does not depend on instantaneous channel information. First, we consider an ideal cooperative relaying protocol where the system can use arbitrary re-encoding methods at the relay and adjust time allocation arbitrarily. We obtain an optimum strategy of power and time allocations to minimize the outage probability of the ideal cooperative protocol. Specifically, for any given time allocation, we are able to determine the corresponding optimum power allocation analytically with a closed-form expression. We also show that to minimize the outage probability of the protocol, one should always allocate more energy and time to the source than the relay. Second, with more realistic consideration, we design a practical cooperative relaying protocol based on linear mapping, i.e., using linear mapping as the re-encoding method at the relay and considering integer time slots in the two phases. The theoretical results from the ideal cooperative protocol serve as a guideline and benchmark in the practical cooperative protocol design. We also develop an optimum linear mapping to minimize the outage probability of the linear-mapping based cooperative protocol. Extensive numerical and simulation studies illustrate our theoretical developments and show that the performance of the proposed cooperative relaying protocol based on the optimum linear mapping is close to the performance benchmark of the ideal cooperative protocol.
Bibliographie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	1536-1276 1558-2248
DOI:	10.1109/TWC.2014.2315813