Proceedings ArticleDOI
QoS-aware joint power allocations and relay selection for NLOS coherent optical wireless communications
Reads0
Chats0
TLDR
A fast-convergent algorithm is proposed for the joint power allocation and relay selection by considering the delay aware quality-of-service requirements of the services transmitted over the optical wireless communication channels.Abstract:
In order to improve the energy efficiency of the optical wireless communications, a joint power allocation and relay selection scheme is proposed for a relay assisted non-line-of-sight optical wireless communication system employing coherent detection with a dual optical channel multiplexing technique. The proposed joint power allocation and relay selection scheme aims to improve energy efficiency of the optical wireless communication system by minimizing the total average transmit power, and provides the delay aware quality-of-service guarantee through maintaining a minimum required effective capacity over the atmospheric turbulence fading channels. The joint power allocation and relay selection problem is formulated as a non-convex and combinatorial optimization problem, and the solution of this optimization problem is obtained using a time-sharing relaxation technique. Subsequently, a fast-convergent algorithm is proposed for the joint power allocation and relay selection by considering the delay aware quality-of-service requirements of the services transmitted over the optical wireless communication channels. Numerical results demonstrate the advantages of the proposed joint power allocation and relay selection scheme in terms of the energy saving for different statistical delay constraints.read more
Citations
More filters
Journal ArticleDOI
Effective Capacity in Wireless Networks: A Comprehensive Survey
TL;DR: This paper provides a comprehensive survey on existing works, that use the Effective capacity (EC) model in various wireless networks, and summarizes the work related to EC for different networks, such as cognitive radio networks (CRNs), cellular networks, relay networks, adhoc Networks, and mesh networks.
Journal ArticleDOI
Joint Relay Selection and Power Allocation for Underwater Cooperative Optical Wireless Networks
TL;DR: Two optimization schemes that minimize the energy consumption and maximize the overall signal-to-noise ratio (SNR) are designed and proved to be strictly quasi-convex and solved by Levenberg-Marquardt (LM) algorithm.
Posted Content
Effective Capacity in Wireless Networks: A Comprehensive Survey
TL;DR: In this article, the authors provide a comprehensive survey on existing works that use the effective capacity (EC) model in various wireless networks such as cognitive radio networks (CRNs), cellular networks, relay networks, ad hoc networks, and mesh networks.
References
More filters
Journal ArticleDOI
Understanding the performance of free-space optics [Invited]
TL;DR: The goal here is to explain some of the design issues surrounding FSO systems and to provide sufficient information to allow potential users to evaluate the suitability of a specific FSO system for a particular application.
Journal ArticleDOI
Relay-Assisted Free-Space Optical Communication
Majid Safari,Murat Uysal +1 more
TL;DR: This paper considers an aggregated channel model which takes into account both path-loss and turbulence-induced log-normal fading in free-space optical systems operating in atmospheric turbulence channels and derived closed form expressions for outage probability of the relaying schemes under consideration.
Journal ArticleDOI
Adaptive Modulation and Coding for Free-Space Optical Channels
TL;DR: In this paper, three adaptive modulation schemes are considered: (i) variable-rate variable-power adaptation, (ii) channel inversion, and (iii) truncated channel-inversion schemes.
Journal ArticleDOI
Relay selection protocols for relay-assisted free-space optical systems
Nestor D. Chatzidiamantis,Diomidis S. Michalopoulos,Emmanouil E. Kriezis,George K. Karagiannidis,Robert Schober +4 more
TL;DR: In this article, relay selection and power allocation for relay-assisted free-space optical (FSO) systems were investigated, where multiple parallel relays are employed and there is no direct link between the source and the destination.
Journal ArticleDOI
Cross-layer modeling for quality of service guarantees over wireless links
TL;DR: The numerical results obtained demonstrate that the proposed cross-layer model can efficiently characterize the interactions between the physical-layer infrastructure and data-link-layer QoS performance.
Related Papers (5)
Distributed Power Allocation Scheme for Multi-Relay Shared-Bandwidth (MRSB) Wireless Cooperative Communication
Shiguo Wang,Hong Ji +1 more