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
Relay Antenna Selection in MIMO Two-Way Relay Networks Over Nakagami- $m$ Fading Channels
TL;DR: Based on asymptotic results, a concise solution for the optimal power allocation among the sources and the relay to maximize the performance under the assumption that both the sources have the same transmit power is determined.
Journal ArticleDOI
Opportunistic Multiple Access for Cognitive Radio Networks
TL;DR: Queueing theoretical analysis and numerical results reveal that despite the fact that relays occupy part of the idle resources to provide cooperation, secondary nodes surprisingly achieve higher throughput in the presence of relays.
Journal ArticleDOI
Cooperative Relaying Under Spatially and Temporally Correlated Interference
TL;DR: The performance of an interference-limited decode-and-forward cooperative relaying system that comprises a source, a destination, and N relays, arbitrarily placed on the plane and suffering from interference by a set of interferers placed according to a spatial Poisson process is analyzed.
Journal ArticleDOI
Coverage Analysis of Millimeter Wave Decode-and-Forward Networks With Best Relay Selection
TL;DR: This paper derives the spatial distribution of the set of decoding relays whose received signal-to-noise ratio (SNR) are above the minimum SNR threshold and selects a relay that has minimum path loss to the receiver and derives the achievable coverage due to this selection.
Proceedings ArticleDOI
Cooperative Transmission for Underwater Acoustic Communications
Zhu Han,Yan Sun,Hongyuan Shi +2 more
TL;DR: The simulation results show that the proposed wave cooperative transmission has significant advantages over the traditional direct transmission and the existing cooperative transmission schemes originally designed for radio wireless networks.
References
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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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