Accession Number : ADA956128

Title :   An Ionospheric Channel Simulator.

Descriptive Note : Technical memo.,

Corporate Author : INSTITUTE FOR TELECOMMUNICATION SCIENCES BOULDER CO

Personal Author(s) : Watterson, C. C. ; AX, G. G. ; Demmer, L. J. ; Johnson, C. H.

Report Date : SEP 1969

Pagination or Media Count : 50

Abstract : An ionospheric channel simulator with characteristics based on an experimentally verified channel model is described. In the channel model, the input (transmitted) signal feeds a delay line that delivers undistorted delayed versions of the input signal to a limited number of adjustable taps with delays corresponding to the relative propagation times of typical ionospheric modes. Each delayed signal is modulated in amplitude and phase by an independent baseband complex bivariate Gaussian random tap-gain function with a zero mean value and quadrature components with equal RMS values that produce Rayleigh fading. Each tap-gain function has a spectrum that, in general, is the sum of two Gaussian functions of frequency, one for each magnetoionic component, which have independently adjustable amplitudes, frequency shifts, and two-sigma frequency spreads. The delayed and modulated signals are summed to form the output (received) signal. Channel model, channel simulator, Ionosphere, Simulation.

Descriptors :   *CHANNELS, *SIMULATORS, AMPLITUDE, DELAY LINES, FREQUENCY SHIFT, GAIN, INPUT, IONOSPHERE, MODELS, OUTPUT, PHASE, PROPAGATION, SIGNALS, SIMULATION, TAPS, VALUE.

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE