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http://dx.doi.org/10.5139/JKSAS.2021.49.11.945

Double Duobinary MSK Modeling of the SOQPSK-TG Signal  

Kim, KyunHoi (Agency for Defense Development)
Eun, Changsoo (Chungnam National University)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.49, no.11, 2021 , pp. 945-951 More about this Journal
Abstract
The SOQPSK-TG is a modulated signal for aeronautical telemetry with a very good bandwidth efficiency. In this paper, the frequency waveform filter of the SOQPSK-TG is linearly approximated and modeled with a duobinary precoder and a modified frequency waveform filter having a phase transition period of about 1Tb. In combination with the existing precoder, the SOQPSK-TG is modeled by a double duobinary MSK. Comparing the SOQPSK-TG signal and the newly modeled double duobinary MSK signal in time domain and frequency domain, it is confirmed that the two signals are almost identical and there is virtually no performance difference. Moreover, we can attain 0.1 dB BER performance improvement compared to the existing cosine filter when the filter of the IQ-detector is implemented with a cosine sum filter taking into account the change in the modulation index by the new double doubinary precoder.
Keywords
Telemetry; CPM; MSK; Duobinary Encoder; SOQPSK-TG; Tamed-FM;
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