Journal ArticleDOI
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
Reads0
Chats0
TLDR
Using distributed antennas, this work develops and analyzes low-complexity cooperative diversity protocols that combat fading induced by multipath propagation in wireless networks and develops performance characterizations in terms of outage events and associated outage probabilities, which measure robustness of the transmissions to fading.Abstract:
We develop and analyze low-complexity cooperative diversity protocols that combat fading induced by multipath propagation in wireless networks. The underlying techniques exploit space diversity available through cooperating terminals' relaying signals for one another. We outline several strategies employed by the cooperating radios, including fixed relaying schemes such as amplify-and-forward and decode-and-forward, selection relaying schemes that adapt based upon channel measurements between the cooperating terminals, and incremental relaying schemes that adapt based upon limited feedback from the destination terminal. We develop performance characterizations in terms of outage events and associated outage probabilities, which measure robustness of the transmissions to fading, focusing on the high signal-to-noise ratio (SNR) regime. Except for fixed decode-and-forward, all of our cooperative diversity protocols are efficient in the sense that they achieve full diversity (i.e., second-order diversity in the case of two terminals), and, moreover, are close to optimum (within 1.5 dB) in certain regimes. Thus, using distributed antennas, we can provide the powerful benefits of space diversity without need for physical arrays, though at a loss of spectral efficiency due to half-duplex operation and possibly at the cost of additional receive hardware. Applicable to any wireless setting, including cellular or ad hoc networks-wherever space constraints preclude the use of physical arrays-the performance characterizations reveal that large power or energy savings result from the use of these protocols.read more
Citations
More filters
Journal ArticleDOI
Fundamental Limits of Cooperation
TL;DR: In this article, it was shown that the high-power spectral efficiency is upper bounded by a quantity that does not depend on the transmit powers, and that cooperation is possible only within clusters of limited size, which are subject to out-of-cluster interference whose power scales with that of the incluster signals.
Journal ArticleDOI
An Adaptive Cooperation Diversity Scheme With Best-Relay Selection in Cognitive Radio Networks
TL;DR: The generalized diversity gain is derived and it is shown that, with a guaranteed primary outage probability, the full diversity order is achieved using the proposed adaptive cooperation scheme.
Journal ArticleDOI
Opportunistic large arrays: cooperative transmission in wireless multihop ad hoc networks to reach far distances
Anna Scaglione,Yao-Win Hong +1 more
TL;DR: The technique proposed in this paper allows efficient flooding of a wireless network with information from a source, which is referred to as the leader, and permits us to transmit reliably to far destinations that the individual nodes are not able to reach without consuming rapidly their own battery resources, even when using multihop links.
Journal ArticleDOI
Stabilization of Networked Control Systems With a New Delay Characterization
TL;DR: A controller design procedure based on mean-square asymptotic stability is derived for the closed-loop networked control systems, and based on this, an inverted pendulum system is utilized to show the effectiveness and applicability of the proposed results.
Journal ArticleDOI
Wireless information and power transfer in cooperative networks with spatially random relays
TL;DR: Open form analytical results can be developed to demonstrate that the use of energy harvesting relays can achieve the same diversity gain as the case with conventional self-powered relays.
References
More filters
Book
Elements of information theory
Thomas M. Cover,Joy A. Thomas +1 more
TL;DR: The author examines the role of entropy, inequality, and randomness in the design of codes and the construction of codes in the rapidly changing environment.
Book
Wireless Communications: Principles and Practice
TL;DR: WireWireless Communications: Principles and Practice, Second Edition is the definitive modern text for wireless communications technology and system design as discussed by the authors, which covers the fundamental issues impacting all wireless networks and reviews virtually every important new wireless standard and technological development, offering especially comprehensive coverage of the 3G systems and wireless local area networks (WLANs).
Journal ArticleDOI
Capacity of Multi‐antenna Gaussian Channels
TL;DR: In this paper, the authors investigate the use of multiple transmitting and/or receiving antennas for single user communications over the additive Gaussian channel with and without fading, and derive formulas for the capacities and error exponents of such channels, and describe computational procedures to evaluate such formulas.
Digital communications
TL;DR: This month's guest columnist, Steve Bible, N7HPR, is completing a master’s degree in computer science at the Naval Postgraduate School in Monterey, California, and his research area closely follows his interest in amateur radio.
Related Papers (5)
User cooperation diversity. Part I. System description
Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks
J.N. Laneman,Gregory W. Wornell +1 more