Patent
Transmit power control techniques for wireless communication systems
TLDR
In this paper, a water-filling procedure was proposed to determine a power level to be used by the transmitter to transmit data at a target data rate under a constraint of an interference limit, the interference limit constraint constraining the transmit power level plus an interference level collectively produced by a set of transmitters from the plurality of the transmitters.Abstract:
There is disclosed a method for controlling transmit power in a multi-user cognitive radio environment having a plurality of transmitters, the method comprising: identifying one or more spectrum holes in a frequency band; identifying a spectrum hole for use by a transmitter; and applying a water-filling procedure to determine a transmit power level to be used by the transmitter to transmit data at a target data rate under a constraint of an interference limit, the interference limit constraint constraining the transmit power level plus an interference level collectively produced by a set of transmitters from the plurality of transmitters to be less than the interference limit.read more
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References
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A Decision-Theoretic Generalization of On-Line Learning and an Application to Boosting
Yoav Freund,Robert E. Schapire +1 more
TL;DR: The model studied can be interpreted as a broad, abstract extension of the well-studied on-line prediction model to a general decision-theoretic setting, and it is shown that the multiplicative weight-update Littlestone?Warmuth rule can be adapted to this model, yielding bounds that are slightly weaker in some cases, but applicable to a considerably more general class of learning problems.
Journal ArticleDOI
Cognitive radio: brain-empowered wireless communications
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.
Journal ArticleDOI
The capacity of wireless networks
Piyush Gupta,P. R. Kumar +1 more
TL;DR: When n identical randomly located nodes, each capable of transmitting at W bits per second and using a fixed range, form a wireless network, the throughput /spl lambda/(n) obtainable by each node for a randomly chosen destination is /spl Theta/(W//spl radic/(nlogn)) bits persecond under a noninterference protocol.
Book
Evolution and the Theory of Games
TL;DR: A modification of the theory of games, a branch of mathematics first formulated by Von Neumann and Morgenstern in 1944 for the analysis of human conflicts, was proposed in this paper.
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Spectrum estimation and harmonic analysis
TL;DR: In this article, a local eigenexpansion is proposed to estimate the spectrum of a stationary time series from a finite sample of the process, which is equivalent to using the weishted average of a series of direct-spectrum estimates based on orthogonal data windows to treat both bias and smoothing problems.