Unscheduled Communication in a Common Frequency Channel

摘要

The report presents some results of a study of a communications concept in which the entire available portion of the electromagnetic spectrum is independently used by each of a multiplicity of wide-band communication links. The resulting signals must therefore be separated by correlation techniques that are more general than the simple time-gating and frequency-selective filtering procedures commonly employed for signal selection purposes. Shannon's channel capacity expressions are used to develop fundamental relationships between the potential performance advantages of the proposed techniques and the required system characteristics. Consideration is given to a number of factors which may have significant practical influence on the merits of such systems. A performance analysis is made of a conceptual system that might be designed using present techniques. The results suggest that significant advances are needed in implementation techniques in order to realize the moderate potential capacity advantages offered by systems of the proposed type. (Author)