Results 1 - 10
of
45
Recent and Emerging Topics in Wireless Industrial Communications: A Selection
, 2007
"... In this paper we discuss a selection of promising and interesting research areas in the design of protocols and systemsforwirelessindustrialcommunications.Wehaveselected topicsthathaveeitheremergedashottopicsintheindustrial communicationscommunityinthelastfewyears(likewireless sensornetworks),orwhi ..."
Abstract
-
Cited by 96 (1 self)
- Add to MetaCart
(Show Context)
In this paper we discuss a selection of promising and interesting research areas in the design of protocols and systemsforwirelessindustrialcommunications.Wehaveselected topicsthathaveeitheremergedashottopicsintheindustrial communicationscommunityinthelastfewyears(likewireless sensornetworks),orwhichcouldbeworthwhileresearchtopicsin thenextfewyears(forexamplecooperativediversitytechniques for error control, cognitive radio/opportunistic spectrum access for mitigation of external interferences).
The MIMO ARQ channel: Diversity-multiplexing-delay tradeoff
- IEEE Trans. Inf. Theory
, 2006
"... Abstract—In this paper, the fundamental performance tradeoff of the delay-limited multiple-input multiple-output (MIMO) automatic retransmission request (ARQ) channel is explored. In particular, we extend the diversity–multiplexing tradeoff investigated by Zheng and Tse in standard delay-limited MIM ..."
Abstract
-
Cited by 86 (8 self)
- Add to MetaCart
(Show Context)
Abstract—In this paper, the fundamental performance tradeoff of the delay-limited multiple-input multiple-output (MIMO) automatic retransmission request (ARQ) channel is explored. In particular, we extend the diversity–multiplexing tradeoff investigated by Zheng and Tse in standard delay-limited MIMO channels with coherent detection to the ARQ scenario. We establish the three-dimensional tradeoff between reliability (i.e., diversity), throughput (i.e., multiplexing gain), and delay (i.e., maximum number of retransmissions). This tradeoff quantifies the ARQ diversity gain obtained by leveraging the retransmission delay to enhance the reliability for a given multiplexing gain. Interestingly, ARQ diversity appears even in long-term static channels where all the retransmissions take place in the same channel state. Furthermore, by relaxing the input power constraint allowing variable power levels in different retransmissions, we show that power control can be
Price-based distributed algorithms for rate-reliability tradeoff in network utility maximization
- IEEE Journal on Selected Areas in Communications
, 2006
"... Abstract—The current framework of network utility maximization for rate allocation and its price-based algorithms assumes that each link provides a fixed-size transmission “pipe ” and each user’s utility is a function of transmission rate only. These assumptions break down in many practical systems, ..."
Abstract
-
Cited by 28 (0 self)
- Add to MetaCart
Abstract—The current framework of network utility maximization for rate allocation and its price-based algorithms assumes that each link provides a fixed-size transmission “pipe ” and each user’s utility is a function of transmission rate only. These assumptions break down in many practical systems, where, by adapting the physical layer channel coding or transmission diversity, different tradeoffs between rate and reliability can be achieved. In network utility maximization problems formulated in this paper, the utility for each user depends on both transmission rate and signal quality, with an intrinsic tradeoff between the two. Each link may also provide a higher (or lower) rate on the transmission “pipes ” by allowing a higher (or lower) decoding error probability. Despite nonseparability and nonconvexity of these optimization problems, we propose new price-based distributed algorithms and prove their convergence to the globally optimal rate-reliability tradeoff under
Wireless Network Coding: Opportunities & Challenges
"... Abstract—Wireless networks suffer from a variety of unique problems such as low throughput, dead spots, and inadequate support for mobility. However, their characteristics such as the broadcast nature of the medium, spatial diversity, and significant data redundancy, provide opportunities for new de ..."
Abstract
-
Cited by 17 (1 self)
- Add to MetaCart
(Show Context)
Abstract—Wireless networks suffer from a variety of unique problems such as low throughput, dead spots, and inadequate support for mobility. However, their characteristics such as the broadcast nature of the medium, spatial diversity, and significant data redundancy, provide opportunities for new design principles to address these problems. There has been recent interest in employing network coding in wireless networks. This paper explores the case for network coding as a unifying design paradigm for wireless networks, by describing how it addresses issues of througput, reliability, mobility, and management. We also discuss the practical challenges facing the integration of such a design into the network stack. I.
Trellis coded spatial modulation
- IEEE Trans. Wireless Commun
, 2010
"... HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte p ..."
Abstract
-
Cited by 16 (9 self)
- Add to MetaCart
(Show Context)
HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et a ̀ la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
System level design for clustered wireless sensor networks
- IEEE Trans. Ind. Inform
, 2007
"... Abstract—We present a system level design methodology for clustered wireless sensor networks based on a semi-random communication protocol called SERAN, a mathematical model that allows to optimize the protocol parameters, and a network initialization and maintenance procedure. SERAN is a two-layer ..."
Abstract
-
Cited by 16 (5 self)
- Add to MetaCart
(Show Context)
Abstract—We present a system level design methodology for clustered wireless sensor networks based on a semi-random communication protocol called SERAN, a mathematical model that allows to optimize the protocol parameters, and a network initialization and maintenance procedure. SERAN is a two-layer (routing and MAC) protocol. At both layers, SERAN combines a randomized and a deterministic approach. While the randomized component provides robustness over unreliable channels, the deterministic component avoids an explosion of packet collisions and allows our protocol to scale with network size. The combined result is a high reliability and major energy savings when dense clusters are used. Our solution is based on a mathematical model that characterizes performance accurately without resorting to extensive simulations. Thanks to this model, the user needs only to specify the application requirements in terms of end-to-end packet delay and packet loss probability, select the intended hardware platform, and the protocol parameters are set automatically to satisfy latency requirements and optimize for energy consumption. Index Terms—Industrial wireless, wireless protocol, wireless sensor network. I.
Realizing the benefits of user-level channel diversity
- SIGCOMM Comput. Commun. Rev
, 2005
"... Realizing the Benefits of User-Level Channel Diversity Channel or path diversity is known to improve performance in physical layer designs, channel access strategies, path switching mechanisms, etc. In this paper, we focus on "user-level " mechanisms that operate simply by distributing pac ..."
Abstract
-
Cited by 14 (6 self)
- Add to MetaCart
(Show Context)
Realizing the Benefits of User-Level Channel Diversity Channel or path diversity is known to improve performance in physical layer designs, channel access strategies, path switching mechanisms, etc. In this paper, we focus on "user-level " mechanisms that operate simply by distributing packet transmissions across multiple channels. We seek to understand when, why, and to what extent this can be of benefit, and equally important, whether these benefits can be realized with as little of an added cost as possible. In that context, our main contribution is not so much in identifying optimal policies for leveraging channel diversity, but in introducing the concept of channel "equivalence " and demonstrating that channel diversity yields substantial benefits mostly when channels are approximately equivalent. We build on this finding to investigate the robustness of these improvements against errors in the characterization of the available channels or changes in their characteristics. We also explore the sensitivity of the results as the number of available channels varies. The findings of the paper demonstrate that by allowing packet transmissions from multiple users to intelligently share channels, it is possible to improve overall
Construction and Analysis of a New Quaternionic Space-Time Code for 4 Transmit Antennas
- Communication in Information and Systems
, 2005
"... We dedicate this paper to Professor Thomas Kailath on the occasion of his 70 th birthday. We have been greatly influenced by his way of attacking engineering prob-lems by exploiting their inherent mathematical structure. This paper is an example of this research paradigm, where nineteenth century ma ..."
Abstract
-
Cited by 9 (2 self)
- Add to MetaCart
We dedicate this paper to Professor Thomas Kailath on the occasion of his 70 th birthday. We have been greatly influenced by his way of attacking engineering prob-lems by exploiting their inherent mathematical structure. This paper is an example of this research paradigm, where nineteenth century mathematics is used to significantly improve the performance of 21 st century wireless infrastructure. Abstract. We present a novel full-rate full-diversity orthogonal space-time block code for QPSK modulation and 4 transmit antennas based on quaternionic algebra. The code does not result in constellation expansion unlike other full-rate full-diversity codes in the literature. The quaternionic structure of the code is exploited to reduce the complexity of maximum likelihood (ML) coherent decoding from a size-256 search to a size-16 search. Furthermore, we show how to modify this low-complexity coherent ML decoding rule to derive a non-coherent differential ML decoding rule. Due to the orthogonality of the code, ML differential decoding results in the minimum SNR loss of 3 dB from coherent ML decoding. Finally, extensive simulation results in a WiMAX 802.16 broadband wireless access environment demonstrate that the proposed code increases the cell coverage area by 1.5 and 2.6 folds compared to single-antenna transmission at 10 −3 bit error rate when combined with 1 and 2 receive antenna(s), respectively. 1. Introduction. WiMAX
