scispace - formally typeset
Topic

Wireless

About: Wireless is a(n) research topic. Over the lifetime, 133440 publication(s) have been published within this topic receiving 1953062 citation(s). The topic is also known as: wireless communications & wireless.

...read more

Papers
  More

Journal ArticleDOI: 10.1016/S1389-1286(01)00302-4
15 Mar 2002-Computer Networks
Abstract: This paper describes the concept of sensor networks which has been made viable by the convergence of micro-electro-mechanical systems technology, wireless communications and digital electronics. First, the sensing tasks and the potential sensor networks applications are explored, and a review of factors influencing the design of sensor networks is provided. Then, the communication architecture for sensor networks is outlined, and the algorithms and protocols developed for each layer in the literature are explored. Open research issues for the realization of sensor networks are also discussed.

...read more

17,354 Citations


Journal ArticleDOI: 10.1109/TIT.2004.838089
J.N. Laneman1, David Tse2, Gregory W. Wornell1Institutions (2)
Abstract: We develop and analyze low-complexity cooperative diversity protocols that combat fading induced by multipath propagation in wireless networks. The underlying techniques exploit space diversity available through cooperating terminals' relaying signals for one another. We outline several strategies employed by the cooperating radios, including fixed relaying schemes such as amplify-and-forward and decode-and-forward, selection relaying schemes that adapt based upon channel measurements between the cooperating terminals, and incremental relaying schemes that adapt based upon limited feedback from the destination terminal. We develop performance characterizations in terms of outage events and associated outage probabilities, which measure robustness of the transmissions to fading, focusing on the high signal-to-noise ratio (SNR) regime. Except for fixed decode-and-forward, all of our cooperative diversity protocols are efficient in the sense that they achieve full diversity (i.e., second-order diversity in the case of two terminals), and, moreover, are close to optimum (within 1.5 dB) in certain regimes. Thus, using distributed antennas, we can provide the powerful benefits of space diversity without need for physical arrays, though at a loss of spectral efficiency due to half-duplex operation and possibly at the cost of additional receive hardware. Applicable to any wireless setting, including cellular or ad hoc networks-wherever space constraints preclude the use of physical arrays-the performance characterizations reveal that large power or energy savings result from the use of these protocols.

...read more

Topics: Cooperative diversity (68%), Antenna diversity (63%), Fading (59%) ...read more

12,519 Citations


Proceedings ArticleDOI: 10.1109/HICSS.2000.926982
04 Jan 2000-
Abstract: Wireless distributed microsensor systems will enable the reliable monitoring of a variety of environments for both civil and military applications. In this paper, we look at communication protocols, which can have significant impact on the overall energy dissipation of these networks. Based on our findings that the conventional protocols of direct transmission, minimum-transmission-energy, multi-hop routing, and static clustering may not be optimal for sensor networks, we propose LEACH (Low-Energy Adaptive Clustering Hierarchy), a clustering-based protocol that utilizes randomized rotation of local cluster based station (cluster-heads) to evenly distribute the energy load among the sensors in the network. LEACH uses localized coordination to enable scalability and robustness for dynamic networks, and incorporates data fusion into the routing protocol to reduce the amount of information that must be transmitted to the base station. Simulations show the LEACH can achieve as much as a factor of 8 reduction in energy dissipation compared with conventional outing protocols. In addition, LEACH is able to distribute energy dissipation evenly throughout the sensors, doubling the useful system lifetime for the networks we simulated.

...read more

Topics: Wireless sensor network (59%), Routing protocol (59%), Mobile wireless sensor network (57%) ...read more

11,951 Citations


Journal ArticleDOI: 10.1109/JSAC.2004.839380
Simon Haykin1Institutions (1)
Abstract: Cognitive radio is viewed as a novel approach for improving the utilization of a precious natural resource: the radio electromagnetic spectrum. The cognitive radio, built on a software-defined radio, is defined as an intelligent wireless communication system that is aware of its environment and uses the methodology of understanding-by-building to learn from the environment and adapt to statistical variations in the input stimuli, with two primary objectives in mind: /spl middot/ highly reliable communication whenever and wherever needed; /spl middot/ efficient utilization of the radio spectrum. Following the discussion of interference temperature as a new metric for the quantification and management of interference, the paper addresses three fundamental cognitive tasks. 1) Radio-scene analysis. 2) Channel-state estimation and predictive modeling. 3) Transmit-power control and dynamic spectrum management. This work also discusses the emergent behavior of cognitive radio.

...read more

Topics: Cognitive radio (74%), Radio resource management (64%), Cognitive network (64%) ...read more

11,825 Citations


Open access
01 Jan 2000-
Abstract: Wireless distributed microsensor systems will enable the reliable monitoring of a variety of environments for both civil and military applications. In this paper, we look at communication protocols, which can have signicant impact on the overall energy dissipation of these networks. Based on our ndings that the conventional protocols of direct transmission, minimum-transmission-energy, multihop routing, and static clustering may not be optimal for sensor networks, we propose LEACH (Low-Energy Adaptive Clustering Hierarchy), a clustering-based protocol that utilizes randomized rotation of local cluster base stations (cluster-heads) to evenly distribute the energy load among the sensors in the network. LEACH uses localized coordination to enable scalability and robustness for dynamic networks, and incorporates data fusion into the routing protocol to reduce the amount of information that must be transmitted to the base station. Simulations show that LEACH can achieve as much as a factor of 8 reduction in energy dissipation compared with conventional routing protocols. In addition, LEACH is able to distribute energy dissipation evenly throughout the sensors, doubling the useful system lifetime for the networks we simulated.

...read more

Topics: Wireless Routing Protocol (61%), Routing protocol (60%), Wireless sensor network (59%) ...read more

11,410 Citations


Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202271
20214,109
20206,721
20197,377
20188,153
20177,821

Top Attributes

Show by:

Topic's top 5 most impactful authors

Rui Zhang

160 papers, 25.6K citations

H. Vincent Poor

126 papers, 5.4K citations

Dusit Niyato

118 papers, 8.4K citations

Zhu Han

116 papers, 8.5K citations

Victor C. M. Leung

107 papers, 3.7K citations

Network Information
Related Topics (5)
Wireless network

122.5K papers, 2.1M citations

97% related
Base station

85.8K papers, 1M citations

96% related
Wireless sensor network

142K papers, 2.4M citations

96% related
Cognitive radio

35.1K papers, 596.4K citations

95% related
Communications system

88.1K papers, 1M citations

95% related