Accession Number : AD0637673

Title :   AN INVESTIGATION OF THE TRANSMISSION OF DIGITAL SIGNALS THROUGH A DISPERSIVE CHAFF CHANNEL.

Descriptive Note : Final technical rept. no. 2, 1 Jun 65-1 May 66.

Corporate Author : RADIATION INC MELBOURNE FLA

Personal Author(s) : Bauer,L. H. ; Langelier,R. M.

Report Date : JUL 1966

Pagination or Media Count : 218

Abstract : The purpose of the Abstract Task III effort was to quantitatively determine the information capacity (and its behavior) of a cloud of chaff dipoles. The effort was directed to theoretical and experimental investigations of binary FSK transmission through a dispersive chaff scatter channel. The experimental work was performed at a frequency of 4650 MHz. Good agreement was obtained between experimental data and theoretical results. Probability of error for a modulating signal of 600 KBPS varied from 0.25 to 0.00015. Measured coherent bandwidth varied from 0.27 to 2 MHz. The median value of measured signal to noise ratio was 23 db. The median value of fading bandwidth was 8 Hz. It was concluded that dispersion of the chaff dipoles adversely affected both signal to noise ratio and probability of error. The linear, time variant, random parameter filter modeled the chaff scatter channel for binary FSK operation. It was determined that the chaff scatter channel met the conditions of a time flat-frequency selective channel; i.e., the predominate effect of the cloud on the received waveform was intersymbol influence. (Author)

Descriptors :   (*COMMUNICATION AND RADIO SYSTEMS, REFLECTORS), (*DATA TRANSMISSION SYSTEMS, COMMUNICATION AND RADIO SYSTEMS), (*INFORMATION THEORY, COMMUNICATION AND RADIO SYSTEMS), DIPOLE ANTENNAS, ELECTROMAGNETIC WAVE REFLECTIONS, RADIO WAVES, PROPAGATION, DIGITAL SYSTEMS

Subject Categories : Cybernetics
      Radiofrequency Wave Propagation
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE