Min-Max Criterion for Global Link Budget Analysis of Digital Channelized SATCOM System and Classical Transponder System

Abstract

A min-max criterion is proposed to implement global link budget analysis for both digital channelized satellite communication (SATCOM) systems and classical transponder systems, and a variable neighborhood search (VNS) based algorithm is put forward for interpreting the proposed min-max criterion. With the combination of the min-max criterion and the VNS-based algorithm, both the optimal gain of each subchannel and the uplink effective isotropic radiated power (EIRP) can be obtained simultaneously. By minimizing the maximum of carrier powers output from the satellite transponder, the proposed criterion aims at reducing the difference among carrier powers in the satellite transponder as much as possible to avoid carrier power being irregular so that we can optimally set the transponder's operating point to improve the transponder power utility, and minimize each terminal's uplink EIRP so that as many links as possible could be supported and thus the system capacity could be enhanced. Furthermore, this proposed approach is generalized to analyze the capacity of classical transponder systems. Practical examples are also presented to verify the proposed approach's superior performance in improving a digital channelized SATCOM system's capacity.