Journal ArticleDOI
Cross-layer optimization for OFDM wireless networks-part I: theoretical framework
Guocong Song,Ye Li +1 more
TLDR
The utility is used in this study to build a bridge between the physical layer and the media access control (MAC) layer and to balance the efficiency and fairness of wireless resource allocation.Abstract:
In this paper, we provide a theoretical framework for cross-layer optimization for orthogonal frequency division multiplexing (OFDM) wireless networks. The utility is used in our study to build a bridge between the physical layer and the media access control (MAC) layer and to balance the efficiency and fairness of wireless resource allocation. We formulate the cross-layer optimization problem as one that maximizes the average utility of all active users subject to certain conditions, which are determined by adaptive resource allocation schemes. We present necessary and sufficient conditions for utility-based optimal subcarrier assignment and power allocation and discuss the convergence properties of optimization. Numerical results demonstrate a significant performance gain for the cross-layer optimization and the gain increases with the number of active users in the networks.read more
Citations
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Journal ArticleDOI
Dual methods for nonconvex spectrum optimization of multicarrier systems
TL;DR: It is shown that under a certain condition called the time-sharing condition, the duality gap of the optimization problem is always zero, regardless of the convexity of the objective function, which leads to efficient numerical algorithms that solve the nonconvex problem in the dual domain.
Journal ArticleDOI
OFDM and Its Wireless Applications: A Survey
TL;DR: This paper addresses basic OFDM and related modulations, as well as techniques to improve the performance of OFDM for wireless communications, including channel estimation and signal detection, time- and frequency-offset estimation and correction, peak-to-average power ratio reduction, and multiple-input-multiple-output (MIMO) techniques.
Journal ArticleDOI
Joint optimization of relay strategies and resource allocations in cooperative cellular networks
T.C.-Y. Ng,Wei Yu +1 more
TL;DR: It is shown that for a cellular system employing orthogonal frequency-division multiple-access (OFDMA), the optimization of physical-layer transmission strategies can be done efficiently by introducing a set of pricing variables as weighting factors.
Journal ArticleDOI
Cross-layer optimization for OFDM wireless networks-part II: algorithm development
Guocong Song,Ye Li +1 more
TL;DR: Simulation results have confirmed that the utility-based cross-layer optimization can significantly enhance the system performance and guarantee fairness and the gains come from multiuser diversity, frequency diversity, as well as time diversity.
Journal ArticleDOI
A Survey on 5G Usage Scenarios and Traffic Models
Jorge Navarro-Ortiz,Pablo Romero-Diaz,Sandra Sendra,Pablo Ameigeiras,Juan J. Ramos-Munoz,Juan M. Lopez-Soler +5 more
TL;DR: The most significant use cases expected for 5G including their corresponding scenarios and traffic models are presented and guidelines to help and ease the performance evaluation of current and future 5G innovations, as well as the dimensioning of 5G future deployments are provided.
References
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Data networks
TL;DR: Undergraduate and graduate classes in computer networks and wireless communications; undergraduate classes in discrete mathematics, data structures, operating systems and programming languages.
Journal ArticleDOI
Communication in the presence of noise
TL;DR: A method is developed for representing any communication system geometrically and a number of results in communication theory are deduced concerning expansion and compression of bandwidth and the threshold effect.
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Rate control for communication networks: shadow prices, proportional fairness and stability
TL;DR: This paper analyses the stability and fairness of two classes of rate control algorithm for communication networks, which provide natural generalisations to large-scale networks of simple additive increase/multiplicative decrease schemes, and are shown to be stable about a system optimum characterised by a proportional fairness criterion.
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Charging and rate control for elastic traffic
TL;DR: This paper addresses the issues of charging, rate control and routing for a communication network carrying elastic traffic, such as an ATM network offering an available bit rate service, from which max-min fairness of rates emerges as a limiting special case.
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Opportunistic beamforming using dumb antennas
TL;DR: This work shows that true beamforming gains can be achieved when there are sufficient users, even though very limited channel feedback is needed, and proposes the use of multiple transmit antennas to induce large and fast channel fluctuations so that multiuser diversity can still be exploited.