Simulation of atmospheric radio noise and application to modem testing
Abstract
Although narrowband atmospheric radio noise is represented by a carrier modulated both in amplitude and phase, the latter characteristic is not taken into consideration by existing hardware simulators. Consequently, the simulated noise has either a constant or a random phase of unknown behavior. Nevertheless, theoretical studies assume the phase to be uniformly distributed and to be slowly varying in time. In order to assuredly generate these proper phase characteristics, this thesis presents a hardware scheme simulating both variables (envelope, phase)by approximating their distributions (rather than their densities). The advantage of this method is that it permits the specification of the time of occurrence of high amplitude pulses without interferring with the amplitude distribution. A hardware scheme is also proposed to accomplish this time control.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- May 1978
- Bibcode:
- 1978PhDT........93C
- Keywords:
-
- Atmospherics;
- Modems;
- Random Noise;
- Simulation;
- Computers;
- Distribution Functions;
- Hardware;
- Hybrid Circuits;
- Phase Modulation;
- Rayleigh Distribution;
- Simulators;
- Communications and Radar