Journal ArticleDOI
Resource Allocation for OFDMA Relay Networks With Fairness Constraints
Guoqing Li,Hui Liu +1 more
TLDR
This paper studies the resource allocation for orthogonal frequency-division multiple-access relay network with multiple source nodes, multiple relay nodes, and a single destination node using a graph theoretical approach.Abstract:
This paper studies the resource allocation for orthogonal frequency-division multiple-access relay network with multiple source nodes, multiple relay nodes, and a single destination node. The optimal source/relay/subcarrier allocation problem with fairness constraint on relay nodes is formulated as a binary integer programming problem. The problem is then tackled using a graph theoretical approach by transforming it into a linear optimal distribution problem in a directed graph. Upper bound of the solution is discussed and simulation results are studied to evaluate the algorithm performanceread more
Citations
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Journal ArticleDOI
Semi-Distributed User Relaying Algorithm for Amplify-and-Forward Wireless Relay Networks
TL;DR: A semi-distributed user relaying algorithm, which can provide comparable system capacity, but has significantly reduced computational complexity, is proposed for amplify-and-forward wireless relay networks.
Journal ArticleDOI
An Overview of Radio Resource Management in Relay-Enhanced OFDMA-Based Networks
Mohamed Adel Salem,Abdulkareem Adinoyi,Mahmudur Rahman,Halim Yanikomeroglu,David Falconer,Young-Doo Kim,Eung-Sun Kim,Yoon-Chae Cheong +7 more
TL;DR: A survey of the current literature on OFDMA networks enhanced with decode-and-forward relaying and their link to earlier literature in non-OFDma networks is provided and a rich list of references is provided to direct the readers toward some of the emerging techniques.
Journal ArticleDOI
Achieving Maximum Energy-Efficiency in Multi-Relay OFDMA Cellular Networks: A Fractional Programming Approach
TL;DR: The joint power and subcarrier allocation problem is solved in the context of maximizing the energy-efficiency of a multi-user, multi-relay orthogonal frequency division multiple access (OFDMA) cellular network, where the objective function is formulated as the ratio of the spectral-efficiency over the total power dissipation.
Journal ArticleDOI
Subcarrier pairing for amplify-and-forward and decode-and-forward OFDM relay links
TL;DR: This letter will provide the proof which verifies that OSP is optimal for both amplify-and- forward (AF) and decode- and-forward (DF) relay links when optimal power allocation is applied.
Journal ArticleDOI
Fairness-aware radio resource management in downlink OFDMA cellular relay networks
Mohamed Adel Salem,Abdulkareem Adinoyi,Mahmudur Rahman,Halim Yanikomeroglu,David Falconer,Young-Doo Kim +5 more
TL;DR: This paper provides a comprehensive centralized RRM algorithm for downlink OFDMA cellular fixed relay networks in a way to ensure user fairness with minimal impact on network throughput and shows that the proposed centralized scheme is different from the traditional centralized schemes in terms of the substantial savings in complexity and feedback overhead.
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
The capacity of wireless networks
Piyush Gupta,P. R. Kumar +1 more
TL;DR: When n identical randomly located nodes, each capable of transmitting at W bits per second and using a fixed range, form a wireless network, the throughput /spl lambda/(n) obtainable by each node for a randomly chosen destination is /spl Theta/(W//spl radic/(nlogn)) bits persecond under a noninterference protocol.
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