Journal ArticleDOI
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
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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
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Journal ArticleDOI
Cooperation in wireless communication networks
Weihua Zhuang,Muhammad Ismail +1 more
TL;DR: Challenging issues which arise at different layers of the network protocol stack are discussed, with an emphasis on the medium access control, network, and transport layers.
Journal ArticleDOI
Beamforming in Wireless Energy Harvesting Communications Systems: A Survey
TL;DR: This paper describes the different beamforming approaches in each network topology according to its design objective such as increasing the throughput, enhancing the energy transfer efficiency, and minimizing the total transmit power, with paying special attention to exploiting the physical layer security.
Journal ArticleDOI
Lifetime maximization for amplify-and-forward cooperative networks
TL;DR: It is demonstrated that the network lifetime can be extended considerably by exploiting both CSI and REI via numerical simulation, and the performance of the proposed strategies that utilize only local CSI and ReI is shown to be comparable to that of the optimal strategy that demands global CSI andREI.
Journal ArticleDOI
Buffer-Aided Relaying With Adaptive Link Selection—Fixed and Mixed Rate Transmission
Nikola Zlatanov,Robert Schober +1 more
TL;DR: This work considers a simple network consisting of a source, a half-duplex decode-and-forward relay with a buffer, and a destination and proposes two new buffer-aided relaying schemes with different requirements regarding the availability of channel state information at the transmitter (CSIT).
Journal ArticleDOI
On the Performance of NOMA-Based Cooperative Relaying Systems Over Rician Fading Channels
TL;DR: In this article, the performance of cooperative NOMA over Rician fading channels is studied, and the exact expression of the average achievable rate is derived by using the Gauss-Chebyshev Integration.
References
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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.
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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).
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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.
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