Radio resource management for cooperative wireless communication systems with organized beam-hopping techniques

ArticleinIEEE Wireless Communications 15(2):100 - 109 · May 2008with12 Reads
DOI: 10.1109/MWC.2008.4492983 · Source: IEEE Xplore
Abstract
Readiness in deployment and flexibility in radio resource configuration are the main features of future wireless communication systems. A cooperative wireless communication system (CWCS) is proposed to follow the same principle, aiming at improving the overall performance of a wireless system with the support of advanced beam-hopping techniques. In this article, we propose a multiloop radio resource management mechanism for the CWCS based on the organized beam-hopping (OBH) technique. The proposed RRM mechanism enhances the robustness of the CWCS, based on the OBH technique working with fast temporal-spatial variant traffic. The results show that the system performance can be further improved by hybrid transmission and event- driven access management techniques.
    • "Cooperative communication is an effective way to improve throughput, link reliability, power consumption , and coverage in wireless networks [1, 2]. In literature a comprehensive study has been done to develop cooperative relaying protocols and resource management techniques to exploit its potential bene- fits [1, 3, 4, 5] . In the conventional cooperative relaying , fixed-rate code is employed for transmission, in which energy of orthogonal transmissions from different nodes is combined by the receiver. "
    [Show abstract] [Hide abstract] ABSTRACT: Cooperative communications, where parallel relays forward information to a destination node, can effectively improve the latency in ad hoc networks. In practice, the performance of data transmission often compromises with the variation of channel coefficient and the mobility of network nodes. The conventional fixed rate cooperative relaying cannot make the outage probability reach zero without having precise channel state information (CSI) at the transmitter. In this paper we study the performance of using fountain codes in a mobile relay network. Specifically, we develop both feedback and non-feedback fountain coded cooperative communication protocols and analyze the performance of these protocols in terms of transmission efficiency. It is observed that the number of total relay nodes plays a significant role on the performance improvement. Simulation results justify that the proposed feedback based protocol always outperforms its non-feedback counterpart in a variety of metrics.
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    • "However, the use of triggered cooperative scheme increases the cooperative algorithm design complexity and computational overhead, as signaling messages are needed to indicate whether the direct transmission between the source and destination is successful or not. A trade-off should be considered between network performance and algorithm complexity323334. "
    [Show abstract] [Hide abstract] ABSTRACT: Relay selection schemes for cooperative communications to achieve full cooperative diversity gains while maintaining spectral and energy efficiency have been extensively studied in a recent research. These schemes select only the best relay from multiple relaying candidates to cooperate with a communication link. In the present paper, we reviewed recently proposed cooperative communication protocols that integrate with relay selection mechanisms. The key design issues for relay selection mechanisms, for example, relaying candidate selection, optimal relay assignment, and cooperative transmission, were identified. We further discussed the challenges of optimal relay assignment in multi-hop wireless sensor networks and presented the potential applications of cooperative communications with a relay selection in such networks. Future research directions were outlined, for example, the issues of service differentiation and system fairness in cooperative communication systems and the joint use of game theory and adaptive learning techniques in relaying candidate selection and optimal-relay assignment mechanisms for efficient allocation of network resources. Copyright © 2011 John Wiley & Sons, Ltd.
    Full-text · Article · Jun 2013
    • "The performance of OBH is shown to be superior to opportunistic beamforming for all levels of mobile populations in a cell. Gains in spectral efficiency of 1 b/s/Hz by OBH over both opportunistic beamforming and coherent beamforming were demonstrated in [9]. Results were obtained through simulation of a cellular system comprised of cells with a 1 km cell radius, each having six beams per cell (i.e., 60 degree sectors ). "
    [Show abstract] [Hide abstract] ABSTRACT: This article provides an overview of contemporary and forward looking inter-cell interference coordination techniques for 4G OFDM systems with a specific emphasis on implementations for LTE. Viable approaches include the use of power control, opportunistic spectrum access, intra and inter-base station interference cancellation, adaptive fractional frequency reuse, spatial antenna techniques such as MIMO and SDMA, and adaptive beamforming, as well as recent innovations in decoding algorithms. The applicability, complexity, and performance gains possible with each of these techniques based on simulations and empirical measurements will be highlighted for specific cellular topologies relevant to LTE macro, pico, and femto deployments for both standalone and overlay networks.
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