Spectrum Efficiency Metrics


Additional Efficiency Considerations



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Additional Efficiency Considerations


These additional efficiency considerations need to be evaluated in addition to the spectrum efficiency metric so that a comprehensive determination of the satellite system efficiency is properly made.
    1. Antenna Size


Satellite system user value is enhanced when the size9 of the antenna is reduced. There is a correlation, however, between user antenna size and the spectrum efficiency metric. Within certain limits, increasing the antenna size, and hence decreasing user value, will allow greater spectrum efficiency through the use of higher order modulations (i.e., moving from QPSK to 8PSK to 16QAM etc.). In terms of overall system optimization and user value, it is not always desirable to use the largest possible antenna sizes to achieve the greatest spectrum efficiency. Antenna size must therefore be included as an additional efficiency consideration when evaluating the spectrum efficiency metric of satellite systems.



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