Spectrum-conservation techniques for fixed-service systems

An investigation of the tradeoffs in system design factors in a communication system that affect the utilization of the spectrum is reported. These design factors include antenna characteristics, modulation type, transmitter output filters, RF output devices, receiver noise figure, and signal processing. The analysis includes the development of a computer model to assess the individual effects of each factor on spectrum conservation, using the definition of spectrum utilization given in CCIR Report 662. The results of the analysis indicated that in the assessment of spectrum conservation for a fixed-service system, the effects of the system design factors acting in combination need to be considered. The results also show that system antenna characteristics and modulation type have a major role in spectrum conservation.<>