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http://dx.doi.org/10.5139/JKSAS.2021.49.10.879

Reception Performance Evaluation of LDPC-Encoded SOQPSK-TG  

Gu, Young Mo (Inha Technical College)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.49, no.10, 2021 , pp. 879-882 More about this Journal
Abstract
The telemetry standard adopts SOQPSK-TG with excellent power and bandwidth efficiency as a modulation technique, and LDPC code with excellent performance as an error correction code. The SOQPSK-TG transmitter consists of a precoder and a CPM modulator. Rather than implementing each receiver separately, the reception performance is improved by combining the trellis and implementing it as a Viterbi decoder. In this paper, the reception performance of LDPC-encoded SOQPSK-TG was evaluated by replacing the Viterbi decoder with a max-log-map decoder capable of soft metric output. As a result of computer simulation in AWGN channel, there is an Eb/No performance gain of about more than 0.7~0.8dB compared to the conventional method.
Keywords
Telemetry; SOQPSK-TG; LDPC; Error Corretion Code; Max-log-map;
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