Joint selection of the parameters of a minimum-shift frequency-keyed complex signal and a matched surface-acoustic-wave filter
DOI:
https://doi.org/10.3103/S073527271990070172Abstract
It is ever more frequently the practice to use frequency-keyed complex signals with minimum shift along with phase-keyed signals in order to increase the efficiency with which the frequency band assigned to a system for transmitting information in complex signals (CS) is utilized. For an identical cycling frequency fc of the main lobe of the spectrum of a frequency keyed complex signal with minimum shift (FK-MS) is already 133 times greater than it is for a phase-keyed (PK) complex signal and contains 99.5% of the total energy (against 92% for a PK complex signal), while the level of the first sidelobe is –23 dB relative to the main lobe (compared to –13 dB for a PK complex signal).References
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