The Influence of Ka Band Satellite Transponder Nonlinearity on High-Speed Data Communication

Satellite communication requires higher and higher information transmission rate, which also requires the development of satellite transponder from traditional C and Ku frequency band to a higher Ka frequency band. However, the performance of high-speed data transmission will be seriously affected by the nonlinear distortion of transponder. In this paper, an actual Ka transponder is specially constructed, which uses a Cortex demodulator to send 600 Mbps and 747.5 Mbps high-speed data transmission signals respectively, and receives and demodulates the high-speed signals transmitted by the transponder, to study the influence of the transponder non-linearity on the bit error rate. Through test, it is proved that the non-linearity has a great effect on the high-speed data transmission system. It is also proof that in the case of high-speed data transmission the performance is not better when the input backoff is more. An ideal input backoff value is 3 dB for Ka transponder in the test. Through the test of Ka transponder in practice, this paper provides a practical reference for the selection of the backoff value in the application of Ka transponder at high-speed data communication.