Journal ArticleDOI
Relay-based deployment concepts for wireless and mobile broadband radio
R. Pabst,Bernhard Walke,D.C. Schultz,P. Herhold,Halim Yanikomeroglu,Sayandev Mukherjee,Harish Viswanathan,Matthias Lott,Wolfgang Zirwas,Mischa Dohler,H. Aghvami,David Falconer,Gerhard Fettweis +12 more
TLDR
An overview of important topics and applications in the context of relaying covers different approaches to exploiting the benefits of multihop communications via relays, such as solutions for radio range extension in mobile and wireless broadband cellular networks and solutions to combat shadowing at high radio frequencies.Abstract:
In recent years, there has been an upsurge of interest in multihop-augmented infrastructure-based networks in both the industry and academia, such as the seed concept in 3GPP, mesh networks in IEEE 802.16, and converge extension of HiperLAN/2 through relays or user-cooperative diversity mesh networks. This article, a synopsis of numerous contributions to the working group 4 of the wireless world research forum and other research work, presents an overview of important topics and applications in the context of relaying. It covers different approaches to exploiting the benefits of multihop communications via relays, such as solutions for radio range extension in mobile and wireless broadband cellular networks (trading range for capacity), and solutions to combat shadowing at high radio frequencies. Furthermore, relaying is presented as a means to reduce infrastructure deployment costs. It is also shown that through the exploitation of spatial diversity, multihop relaying can enhance capacity in cellular networks. We wish to emphasize that while this article focuses on fixed relays, many of the concepts presented can also be applied to systems with moving relays.read more
Citations
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Journal ArticleDOI
Cooperative strategies and capacity theorems for relay networks
TL;DR: The capacity results generalize broadly, including to multiantenna transmission with Rayleigh fading, single-bounce fading, certain quasi-static fading problems, cases where partial channel knowledge is available at the transmitters, and cases where local user cooperation is permitted.
Journal ArticleDOI
Cooperative Communications for Cognitive Radio Networks
K. Ben Letaief,Wei Zhang +1 more
TL;DR: The use of cooperative spectrum sensing in cognitive radio systems to enhance the reliability of detecting primary users and a cognitive space-time-frequency coding technique that can opportunistically adjust its coding structure by adapting itself to the dynamic spectrum environment are considered.
Journal ArticleDOI
Green Cellular Networks: A Survey, Some Research Issues and Challenges
TL;DR: A brief survey of methods to improve the power efficiency of cellular networks, explore some research issues and challenges and suggest some techniques to enable an energy efficient or "green" cellular network.
Journal ArticleDOI
Cooperative Localization in Wireless Networks
TL;DR: This paper describes several cooperative localization algorithms and quantify their performance, based on realistic UWB ranging models developed through an extensive measurement campaign using FCC-compliant UWB radios, and presents a powerful localization algorithm that is fully distributed, can cope with a wide variety of scenarios, and requires little communication overhead.
Journal ArticleDOI
High-Performance Cooperative Demodulation With Decode-and-Forward Relays
TL;DR: A high-performance low-complexity coherent demodulator at the destination in the form of a weighted combiner is derived from a practically attractive decode-and-forward relay strategy to achieve spatial diversity gains, regardless of the underlying constellation.
References
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Integrated cellular and ad hoc relaying systems: iCAR
TL;DR: The results show that with a limited number of ARSs and some increase in the signaling overhead (as well as hardware complexity), the call blocking/dropping probability in a congested cell and the overall system can be reduced.
Journal ArticleDOI
On the relaying capability of next-generation GSM cellular networks
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Proceedings ArticleDOI
Relayer selection strategies in cellular networks with peer-to-peer relaying
TL;DR: This work considers a TDMA cellular multihop network where relaying - via wireless terminals that have a good communication link to the base station - is used as a coverage enhancement technique and investigates the effects of relaying node selection strategies and maximum relayer transmit power level on coverage.
Journal ArticleDOI
Performance of cellular networks with relays and centralized scheduling
TL;DR: A centralized downlink scheduling scheme in a cellular network with a small number of relays is proposed and it is found that, with four relays deployed in each sector, it is possible to achieve significant throughput gain including the signaling overhead.
Proceedings ArticleDOI
On the performance of cooperative diversity protocols in practical wireless systems
TL;DR: This work studies cooperative diversity protocols for systems employing limited modulation alphabets and realistic receiver structures regarding the knowledge of channel state information to imply that full second order diversity can only be achieved by using adaptive versions of cooperative protocols.
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