Journal ArticleDOI
Cooperative wireless communications: a cross-layer approach
TLDR
In cooperative communications, multiple nodes in a wireless network work together to form a virtual antenna array to exploit the spatial diversity of the traditional MIMO techniques without each node necessarily having multiple antennas.Abstract:Â
This article outlines one way to address these problems by using the notion of cooperation between wireless nodes. In cooperative communications, multiple nodes in a wireless network work together to form a virtual antenna array. Using cooperation, it is possible to exploit the spatial diversity of the traditional MIMO techniques without each node necessarily having multiple antennas. Multihop networks use some form of cooperation by enabling intermediate nodes to forward the message from source to destination. However, cooperative communication techniques described in this article are fundamentally different in that the relaying nodes can forward the information fully or in part. Also the destination receives multiple versions of the message from the source, and one or more relays and combines these to obtain a more reliable estimate of the transmitted signal as well as higher data rates. The main advantages of cooperative communications are presentedread more
Citations
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Journal ArticleDOI
Cooperative Communications in Resource-Constrained Wireless Networks
TL;DR: This article provides a tutorial survey on various power allocation strategies for cooperative networks based on different cooperation strategies, optimizing criteria, and CSI assumptions and identifies the similarities between cooperative networks and several sensor network applications that utilize collaboration among distributed sensors to achieve the system goal.
Book
Cooperative Communications
TL;DR: This article reviews progress in cooperative communication networks and intends its presentation to be a tutorial for the reader who is familiar with information theory concepts but has not actively followed the field.
Patent
Method and apparatus for cooperative wireless communications
Sana Sfar,Alexander Reznik,Prabhakar R. Chitrapu,Zinan Lin,Mohammed Sammour,Ana Lucia Pinheiro,Mihaela C. Beluri,Ye Chunxuan,Yogendra C. Shah,Charlton Gregg A,Zhang Guodong,Manseta Khushali N,Hu Ruiyuan +12 more
TL;DR: In this article, a method and apparatus for cooperation in wireless communications is proposed, where cooperation is considered among a number of network elements, including at least one wireless transmit-receive unit, at least 1 relay station, and at least 2 base station.
Journal ArticleDOI
Multicast Scheduling and Resource Allocation Algorithms for OFDMA-Based Systems: A Survey
TL;DR: This survey explains multicast group formation and various forms of group rate determination approaches, and cohesively review the algorithms in terms of their throughput maximization, fairness considerations, performance complexities, multi-antenna support, optimality and simplifying assumptions.
Proceedings ArticleDOI
A cooperative Internet of Things (IoT) for rural healthcare monitoring and control
TL;DR: This paper proposes a cooperative IoT approach for the better health monitoring and control of rural and poor human being's health parameters like blood pressure, hemoglobin, blood sugar, abnormal cellular growth in any part of the body, etc.
References
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Journal ArticleDOI
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
TL;DR: 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.
Journal ArticleDOI
User cooperation diversity. Part I. System description
TL;DR: Results show that, even though the interuser channel is noisy, cooperation leads not only to an increase in capacity for both users but also to a more robust system, where users' achievable rates are less susceptible to channel variations.
Journal ArticleDOI
Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks
J.N. Laneman,Gregory W. Wornell +1 more
TL;DR: This work develops and analyzes space-time coded cooperative diversity protocols for combating multipath fading across multiple protocol layers in a wireless network and demonstrates that these protocols achieve full spatial diversity in the number of cooperating terminals, not just theNumber of decoding relays, and can be used effectively for higher spectral efficiencies than repetition-based schemes.
Journal ArticleDOI
Capacity theorems for the relay channel
Thomas M. Cover,Abbas El Gamal +1 more
TL;DR: In this article, the capacity of the Gaussian relay channel was investigated, and a lower bound of the capacity was established for the general relay channel, where the dependence of the received symbols upon the inputs is given by p(y,y) to both x and y. In particular, the authors proved that if y is a degraded form of y, then C \: = \: \max \!p(x,y,x,2})} \min \,{I(X,y), I(X,Y,Y,X,Y
Capacity theorems for the relay channel
Thomas M. Cover,A. El Gamal +1 more
TL;DR: An achievable lower bound to the capacity of the general relay channel is established and superposition block Markov encoding is used to show achievability of C, and converses are established.