Elie J. Baghdady

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This paper presents the theory of modulation by hopping or by commutation among a number of spaced antennas. The theory brings out the important considerations and criteria for selecting the separation of discrete antennas in discrete time and/or space to produce a desired modulation. In addition, antenna hopping and commutation are proposed for generating(More)
Theoretical investigation of the use of feedback around the limiter for improving the capture conditions at the input to the limiter has led to the formulation of a simple theory that unfolds some remarkable properties hitherto unreported. Contrary to the claim of R. M. Wilmotte (1), who made the first (and apparently only) around-the-limiter feedback(More)
In this group we are concerned with a variety of problems in modulation and communication. We are currently engaged in studies relating to: 1. Advancing the techniques of separating signals by means of simple economical methods so that the use of guard bands between assigned frequency channels can be dispensed with. 2. Increasing the range and reliability(More)
The effect of a stage of ideal bandpass-limiting upon the disturbances arising from multipath and cochannel interference has been shown to result in a substantial reduction in the minimum necessary bandwidth requirements (for interference rejection) in the discriminator FM-to-AM characteristic. It has also been demonstrated that the same effect will be(More)
The convergence properties of the Carson and Fry and of the van der Pol-Stumpers expansions for the complex amplitude of the steady-state response of a filter to an FM excitation are discussed. The theory of quasi-stationary analysis and of FM-to-AM conversion with low distortion is presented. The use of Taylor's formula leads to error estimates and to a(More)
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