Line-of-Sight Wideband Propagation
Final technical rept. 31 Jul 1972-6 Apr 1973
CNR INC NEEDHAM MA
Pagination or Media Count:
igates the limitations on the use of wideband pseudo-noise carriers imposed by the tropospheric propagation medium in the 4-10 GHz band. In addition channel measurement experiments are specified to check the analytical results. A detailed examination is given of the effects of refractive layers, volume scattering, surface scattering and reflection, and the frequency selectivity of the atmospheric constituents. The effect of discrete multipath on the error rate performance of a representative pseudo-noise carrier data transmission modem is investigated. Also a two-correlator anti-multipath modem is investigated as a means to counteract the discrete multipath and is found to improve performance. For channel measurements, a pseudo-noise probing signal and a single time-multiplexed correlation demodulation is found to be the most economical for providing the essential data for channel parameter extraction and stored channel simulations.
- Radiofrequency Wave Propagation
- Radio Communications