Estimation of Time-Limited Channel Spectra From Nonuniform Samples

This paper deals with the estimation of a time-invariant channel spectrum from its own nonuniform samples, assuming there is a bound on the channel’s delay spread. Except for this last assumption, this is the basic estimation problem in systems providing channel spectral samples. However, as shown in the paper, the delay spread bound leads us to view the spectrum as a band-limited signal, rather than the Fourier transform of a tapped delay line (TDL). Using this alternative model, a linear estimator is presented that approximately minimizes the expected root-mean-square (RMS) error for a deterministic channel. Its main advantage over the TDL is that it takes into account the spectrum’s smoothness (time width), thus providing a performance improvement. The proposed estimator is compared numerically with the maximum likelihood (ML) estimator based on a TDL model in pilot-assisted channel estimation (PACE) for OFDM.

"Procrastination is the thief of time" (manuscript essay), 1799 November 26

Four-page handwritten essay in English by Buckminster on the consequences of procrastination. The essay begins, "Moralists of every age & nation, from wise, proverbial Solomon to 'poor Richard' of our own times, have united in recommending industry, as one of the most necessary virtues." The essay is titled with a quote from Edward Young's poem, "The Complaint," and ends with two lines from Horace beginning, "Est modus in rebus ; sunt certi denique fines..."

Account of time spent on College jobb, April 1813-1816

Sewn volume detailing the hours worked possibly by a carpenter or mason during the construction of University Hall. In addition to time worked, daily entries log the workmen employed on the project and the tasks completed in each room of University Hall. The back cover has several small drawings and illustrations inscribed with the year 1816.

Drydock extension : a 1980 underwater technology survey for extension of time between drydockings /

"Report no. CD-D-15-81."

The American cottage cookery-book, or, Housekeeping made easy, pleasant and economical in all its departments : the result of many years' practical experience and observation, and designed as a reliable aid to those who study economy of time and materials /

Includes sections on food preparation, cooking for the sick, and household hints; some recipes include wine or liquor as an ingredient. Sample recipes: Alamode beef, Cold slaw, Little plum cakes that will keep a year, Currant jelly.

Prisoners of time research : what we know and what we need to know /

"September 1994."

A world history for the workers; a story of man's doings from the dawn of time, from the standpoint of the disinherited,

Brittle paper.

Seven-figure trigonometrical tables for every second of time.

"Errata" slip attached to p. [7]

The concept of time in programming languages.

Thesis (M.S.)--University of Illinois at Urbana-Champaign.

Comparative response times of time-sharing systems on the ARPA network /

Vita.

Uranoscopia or, the contemplation of the heavens : being a demonstration of the equation of time : with the method of observing the solar ingresses into any point of the ecliptic ... /

Mode of access: Internet.

Proposed adoption of a four-day, forty-hour workweek, without payment of time and one-half overtime compensation for work days exceeding eight hours.

Reproduction of typescript.

The bird of time: songs of life, death & the spring,

"New edition".