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Influence of channel nonlinearity on high-speed data demodulation performance based on simulator

This paper mainly studies the influence of channel nonlinearity on the high-speed demodulation performance of satellite with 2/3 LDPC encoding and 600Mbps speed. Through the design of a channel simulator-based test plan, a single channel characteristic test is carried out, focusing on the analysis of the impact of the amplitude-frequency characteristic, group delay, phase noise and other single channel nonlinear characteristics on the high-speed demodulation performance, and the influence of channel nonlinearity on high-speed data demodulation performance is analyzed through the comprehensive channel characteristic test. Results show that the measured phase noise and amplitude-frequency characteristic curves have little influence on the bit error rate, and the group delay has a greater influence on the bit error rate. When the group delay fluctuates more than $pL2ns, the demodulation threshold is increased by 10dB. In addition, other nonlinear characteristics, such as third-order intermodulation, AM/PM and AM/AM, are also analyzed.