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Author: Jennifer Elizabeth Price
Publisher:
ISBN: 9780549051879
Category :
Languages : en
Pages : 157
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Book Description
The contributions of this research lie in four main areas: (i) distributed and adaptive rate assignments for CDMA 1xEVDO-type systems, (ii) cross-layer optimal rate assignments for hybrid wired/wireless CDMA networks, (iii) leveraging downlink for socially optimal and incentive compatible uplink rate allocation in cellular networks, and (iv) capacity-achieving rate assignments in unicast networks that employ network coding. In each of these problems, I address issues related to modeling, analysis, implementation, and validation.
Author: Jennifer Elizabeth Price
Publisher:
ISBN: 9780549051879
Category :
Languages : en
Pages : 157
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Book Description
The contributions of this research lie in four main areas: (i) distributed and adaptive rate assignments for CDMA 1xEVDO-type systems, (ii) cross-layer optimal rate assignments for hybrid wired/wireless CDMA networks, (iii) leveraging downlink for socially optimal and incentive compatible uplink rate allocation in cellular networks, and (iv) capacity-achieving rate assignments in unicast networks that employ network coding. In each of these problems, I address issues related to modeling, analysis, implementation, and validation.
Author: Emil Björnson
Publisher: Now Pub
ISBN: 9781601986382
Category : Technology & Engineering
Languages : en
Pages : 282
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Book Description
Optimal Resource Allocation in Coordinated Multi-Cell Systems provides a solid grounding and understanding for optimization of practical multi-cell systems and will be of interest to all researchers and engineers working on the practical design of such systems.
Author: Chiang-Yu Chen
Publisher:
ISBN: 9780549488934
Category :
Languages : en
Pages : 121
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Book Description
Since rate maximization is not always the design objective of system operators, other optimization problems such as power control, proportional rate allocation, and margin maximization, are formulated. Interestingly, after the Lagrange dual decomposition, all the problems have the same tonal subproblem so that the techniques in weighted sum-rate maximization problems can be applied.
Author: Kibeom Seong
Publisher:
ISBN: 9780549489108
Category :
Languages : en
Pages : 159
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Book Description
Satisfaction of different QoS demands for various broadband services in wireless networks requires that multi-user packet scheduling intelligently use both channel state information (CSI) and queue state information (QSI). A combination of queue-channel-aware scheduling and power/rate allocation on each transmit dimension is known as "cross-layer resource allocation". This thesis investigates various aspects of cross-layer resource allocation to illustrate its important role in multi-user communication systems. Of particular interest are downlink and uplink wireless systems that use orthogonal frequency division multiplexing (OFDM) modulation and multi-input multi-output (MIMO) transmission with multiple antennas.
Author: Dennis Lee Goeckel
Publisher:
ISBN:
Category :
Languages : en
Pages : 416
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Book Description
Author: Zukang Shen
Publisher:
ISBN:
Category : Resource allocation
Languages : en
Pages :
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Book Description
Author: Elias Yaacoub
Publisher: John Wiley & Sons
ISBN: 1118074505
Category : Technology & Engineering
Languages : en
Pages : 298
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Book Description
Tackling problems from the least complicated to the most, Resource Allocation in Uplink OFDMA Wireless Systems provides readers with a comprehensive look at resource allocation and scheduling techniques (for both single and multi-cell deployments) in uplink OFDMA wireless networks relying on convex optimization and game theory to thoroughly analyze performance. Inside, readers will find topics and discussions on: Formulating and solving the uplink ergodic sum-rate maximization problem Proposing suboptimal algorithms that achieve a close performance to the optimal case at a considerably reduced complexity and lead to fairness when the appropriate utility is used Investigating the performance and extensions of the proposed suboptimal algorithms in a distributed base station scenario Studying distributed resource allocation where users take part in the scheduling process, and considering scenarios with and without user collaboration Formulating the sum-rate maximization problem in a multi-cell scenario, and proposing efficient centralized and distributed algorithms for intercell interference mitigation Discussing the applicability of the proposed techniques to state-of-the-art wireless technologies, LTE and WiMAX, and proposing relevant extensions Along with schematics and figures featuring simulation results, Resource Allocation in Uplink OFDMA Wireless Systems is a valuable book for?wireless communications and cellular systems professionals and students.
Author: Dawei Wang
Publisher:
ISBN: 9781303429651
Category :
Languages : en
Pages : 92
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Book Description
In this dissertation, we investigate problems of resource allocation for uplink multiuser wireless communication channels. The users want to upload compressed video streams with different rate-distortion (RD) characteristics to a base station via a multi-carrier channel. The video is organized in groups of pictures (GOP), and the base station makes resource allocation decisions based jointly on the channel state information (CSI) and the RD information to minimize the average video distortion across all users. We first study the case where the channel is slowly varying. With the assumption of the channel staying constant over the duration of a GOP, we derive an optimal condition for minimizing the sum of distortions in a setting of continuous frequency channel response. Our result shows that for a specific band to be assigned to a particular user, the product of the slope of the RD curve of that user and a marginal rate increment corresponding to that band should be maximized. We then design an algorithm which iteratively calculates the status of the RD information and the CSI in a block fading setting. Compared to two baseline resource allocation algorithms that use only a single layer of information, the simulation results show that the cross layer scheme can consistently improve the performance of the system. We then focus on the case of a channel with arbitrary mobility. To better utilize the time varying channel, we design a pilot symbol assisted modulation (PSAM) system which periodically adapts the modulation format according to the instantaneous CSI. We show that the two baseline algorithms with single layer information behave quite differently as the Doppler spread changes, but the cross layer algorithm performs robustly across all different mobile speeds. We further characterize the capacity gain of using the cross layer scheme.
Author: Xuan Wang
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
In this dissertation, we discuss various aspects of scheduling and resource allocation in multi-user wireless systems. This work starts from how to utilize advanced physical-layer technology to improve the system performance in a multi-user environment. We show that by using superposition coding (SPC) and successive interference cancellation, the system performance can be greatly improved with utility-based scheduling. Several observations are made as the design guideline for such system. Scheduling algorithms are designed for a system with hierarchical modulation which is a practical implementation of SPC. However, when the utility-based scheduling is designed, it is based on the assumption that the system is saturated, {\em i.e.}, users in the system always have data to transmit. It is pointed out in the literature that in a system with stochastic traffic, even if the arrival rate lies inside the capacity region, the system in terms of queue might not be stable with the utility-based scheduling. Motivated by this, we have studied the stability region of a general utility-based scheduling in a multi-user system with stochastic traffic. We show that the stability region is generally less than the capacity region, depends on how to interpret an intermediate control variable, and the resultant stability region may be even non-convex and exhibits undesirable properties which should be avoided. As the utility-based scheduling cannot achieve throughput-optimal, we turn our attentions to the throughput-optimal scheduling algorithms, whose stability region is identical to the capacity region. The limiting properties of an overloaded wireless system with throughput-optimal scheduling algorithms are studied. The results show that the queue length is unstable however the scheduling function of the queue length is stable, and the average throughput of the system converges. Finally we study how to schedule users in a multi-user wireless system with information-theoretic security support, which is focused on the secrecy outage probability. The problem is essentially about how to schedule users, and allocate resources to stabilize the system and minimize the secrecy outage probability. We show that there is a tradeoff between the arrival rate of the traffic and the secrecy outage probability. The relative channel condition of the eavesdropper also plays an important role to the secrecy outage probability. In summary, we showed utility-based scheduling using SPC can improve the system performance greatly, but the utility-based scheduling has limitations: the stability region might not have desired properties. On the contrary throughput-optimal scheduling has its own drawbacks: the traffic cannot be handled properly if the system is overloaded. The further study on the secrecy outage probability gives guideline on how to design a scheduler in a system with information-theoretic security support.
Author: Shlomi Arnon
Publisher: Cambridge University Press
ISBN: 1316240444
Category : Technology & Engineering
Languages : en
Pages : 223
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Book Description
Visible light communication (VLC) is an evolving communication technology for short-range applications. Exploiting recent advances in the development of high-power visible-light emitting LEDs, VLC offers an energy-efficient, clean alternative to RF technology, enabling the development of optical wireless communication systems that make use of existing lighting infrastructure. Drawing on the expertise of leading researchers from across the world, this concise book sets out the theoretical principles of VLC, and outlines key applications of this cutting-edge technology. Providing insight into modulation techniques, positioning and communication, synchronisation, and industry standards, as well as techniques for improving network performance, this is an invaluable resource for graduate students and researchers in the fields of visible light communication, optical wireless communication, and industrial practitioners in the field of telecommunications.
