Radiation Incorporated Signaling System Study.
Abstract
A method of high-speed signaling is investigated in which reliability, simplicity of equipment, and application to existing and projected equipment are considered. Emphasis is on the applicability of telephone wire/cable links for transmission of digital signaling over the voice paths to be used. It is assumed that as long as phase relationships of signals are maintained, radio links would be no more detrimental than land links. Only baseband signals are considered, since introducing modulation tends either to reduce the admissible signaling speed or to complicate the equipment. Usable frequencies are those between 300 and 3500 c in which the attenuation-vs-frequency is relatively constant, but the phase-vs-frequency is non-linear (delay distortion). Type H88 cable is used as a basis for computer calculation of both signal distortion and the resultant matched filter response distortion for distances up to 30 miles. Four baseband signals are mentioned, but almost exclusive attention is given to the dipulse (a single cycle of a sine wave) and tripulse (the matched filter response to a dipulse). The spectra of the signals are displayed and the concept of the matched filter is discussed and applied as the optimum detector for the signals in question. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 1962
- Accession Number
- AD0283320