Author
Theodore S. Rappaport
Other affiliations: University of Waterloo, University of Texas at Austin, Purdue University ...read more
Bio: Theodore S. Rappaport is an academic researcher from New York University. The author has contributed to research in topics: Path loss & Multipath propagation. The author has an hindex of 112, co-authored 490 publications receiving 68853 citations. Previous affiliations of Theodore S. Rappaport include University of Waterloo & University of Texas at Austin.
Papers published on a yearly basis
Papers
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6 citations
16 May 1999
TL;DR: These new envelope PDFs appear to be general equations for modeling local area multipath fading since they contain Rayleigh and Rician PDFs as special cases, and also model local area fading that often defies characterization by classical PDFs.
Abstract: This paper presents new envelope PDFs (probability density functions) that describe small-scale, local area fading experienced by narrowband wireless receivers. It develops novel PDFs that describe the local area fading of two coherent multipath components in the presence of other diffuse propagating waves. Analytical expressions, graphical analysis, and applicability of the PDFs are presented. These new PDFs appear to be general equations for modeling local area multipath fading since they contain Rayleigh and Rician PDFs as special cases, and also model local area fading that often defies characterization by classical PDFs.
6 citations
01 Jan 2000
TL;DR: In this article, the authors present an analysis of the mm-wave broadband channel propagation data collected under different weather conditions, focusing on measurement-based propagation models for small scale fading in rain, for average rain attenuation and large-scale attenuation over broadband millimeter wave links.
Abstract: Abstract This submission concisely presents analysis of the mm-wave broadband channel propagation data collected under different weather conditions. The emphasis is on measurement based propagation models for small scale fading in rain, for average rain attenuation and large-scale attenuation over broadband millimeter wave links. A deterministic modeling technique for link design is also presented.
6 citations
11 Jun 1989
TL;DR: OLYMPUS experiments are planned that will include attenuation and fade slope measurements, uplink power control modeling, rain scatter interference measurements, and small-scale site-diversity operation to serve as prototypes for later ACTS experiments.
Abstract: The ESA satellite OLYMPUS and the NASA satellite ACTS (Advanced Communications Technology Satellite) both provide opportunities for 12, 20, and 30 GHz propagation and communications experiments. OLYMPUS is scheduled for launch in 1989 and ACTS in 1992. Measurements are particularly needed on short-term signal behavior and on real-time frequency scaling of attenuation to support uplink power control and adaptive forward error correction techniques. OLYMPUS experiments are planned that will include attenuation and fade slope measurements, uplink power control modeling, rain scatter interference measurements, and small-scale site-diversity operation. These are intended to serve as prototypes for later ACTS experiments. >
6 citations
TL;DR: The binding schema markup language (BSML) as discussed by the authors is a markup language for describing data interchange between scientific codes. But it is designed to integrate with a PSE or application composition system that views model specification and execution as a problem of managing semistructured data.
Abstract: We describe a binding schema markup language (BSML) for describing data interchange between scientific codes. Such a facility is an important constituent of scientific problem solving environments (PSEs). BSML is designed to integrate with a PSE or application composition system that views model specification and execution as a problem of managing semistructured data. The data interchange problem is addressed by three techniques for processing semistructured data: validation, binding, and conversion. We present BSML and describe its application to a PSE for wireless communications system design.
6 citations
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TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.
Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …
33,785 citations
TL;DR: The concept of sensor networks which has been made viable by the convergence of micro-electro-mechanical systems technology, wireless communications and digital electronics is described.
17,936 citations
TL;DR: Using distributed antennas, this work develops and analyzes low-complexity cooperative diversity protocols that combat fading induced by multipath propagation in wireless networks and develops performance characterizations in terms of outage events and associated outage probabilities, which measure robustness of the transmissions to fading.
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.
12,761 citations
TL;DR: Following the discussion of interference temperature as a new metric for the quantification and management of interference, the paper addresses three fundamental cognitive tasks: radio-scene analysis, channel-state estimation and predictive modeling, and the emergent behavior of cognitive radio.
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.
12,172 citations
TL;DR: This work develops and analyzes low-energy adaptive clustering hierarchy (LEACH), a protocol architecture for microsensor networks that combines the ideas of energy-efficient cluster-based routing and media access together with application-specific data aggregation to achieve good performance in terms of system lifetime, latency, and application-perceived quality.
Abstract: Networking together hundreds or thousands of cheap microsensor nodes allows users to accurately monitor a remote environment by intelligently combining the data from the individual nodes. These networks require robust wireless communication protocols that are energy efficient and provide low latency. We develop and analyze low-energy adaptive clustering hierarchy (LEACH), a protocol architecture for microsensor networks that combines the ideas of energy-efficient cluster-based routing and media access together with application-specific data aggregation to achieve good performance in terms of system lifetime, latency, and application-perceived quality. LEACH includes a new, distributed cluster formation technique that enables self-organization of large numbers of nodes, algorithms for adapting clusters and rotating cluster head positions to evenly distribute the energy load among all the nodes, and techniques to enable distributed signal processing to save communication resources. Our results show that LEACH can improve system lifetime by an order of magnitude compared with general-purpose multihop approaches.
10,296 citations