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6846 results in Communications and signal processing

Page 199 of 343

  • Preface

  • Santosh S. Venkatesh, University of Pennsylvania
  • Book:
    The Theory of Probability
    Published online:
    05 December 2012
    Print publication:
    08 November 2012, pp xv-xxiv

  • Summary

    Gentle Reader: Henry Fielding begins his great comic novel Tom Jones with these words.

    An author ought to consider himself, not as a gentleman who gives a private or eleemosynary treat, but rather as one who keeps a public ordinary, at which all persons are welcome for their money. […] Men who pay for what they eat, will insist on gratifying their palates, however nice and even whimsical these may prove; and if every thing is not agreeable to their taste, will challenge a right to censure, to abuse, and to d—n their dinner without controul.

    To prevent therefore giving offence to their customers by any such disappointment, it hath been usual, with the honest and well-meaning host, to provide a bill of fare, which all persons may peruse at their first entrance into the house; and, having thence acquainted themselves with the entertainment which they may expect, may either stay and regale with what is provided for them, or may depart to some other ordinary better accommodated to their taste.

    To take a hint from these honest victuallers, as Fielding did, it strikes me therefore that I should at once and without delay explain my motivations for writing this book and what the reader may reasonably hope to find in it. To the expert reader who finds a discursive prolegomenon irritating, I apologise. There have been so many worthy and beautiful books published on the subject of probability that any new entry must needs perhaps make a case for what is being added to the canon.

  • 3 - Future wireless operation, environments, and dynamic spectrum access

  • from Part I - Overview
  • Preston Marshall, University of Southern California
  • Book:
    Scalability, Density, and Decision Making in Cognitive Wireless Networks
    Published online:
    05 December 2012
    Print publication:
    08 November 2012, pp 53-73

  • Summary

    Overview

    This chapter provides an overview of the growth of wireless architectures that are challenged in terms of both capacity and density spectrum density, and outlines general options for addressing these challenges. One of the premises of this book is that the challenge of operating in dense spectrum will fundamentally change the nature of wireless operation for all spectrum-dependent systems, and that these changes will both require new technology (control, coordination, and decision making as examples) and create new opportunities to fundamentally extend the capabilities of wireless systems, ultimately to the point of comparability with wired delivery modes.

    Although this book is not specifically about implementation of dynamic spectrum access (DSA), many of the techniques it describes assume DSA features will be present in future wireless systems. This is not an unreasonable assumption, insofar as both regulatory acceptance and technical necessity would appear to support this spectrum-access modality, for all emerging spectrum applications. DSA has many advantages in terms of enabling increased use of the spectrum, but it is also enabling for even more significant changes in wireless network operation, including the ability of nodes to mitigate interference to themselves from other nodes, locate frequencies with optimal propagation to achieve network density, and manage modulation and bandwidth.

    Much of the DSA research literature focuses on achieving interference-free operation. Here, we will use the flexibility provided by DSA to manage a node's own environment.

Page 199 of 343