A calibration method of demodulation loss for HDR

Abstract

Aiming at the problem that it is difficult to calibrate the demodulation loss parameter for high code rate integrated base band device (HDR) in a Gaussian White Noise environment, a method based on vector signal analyzer is proposed to measure the parameters of error vector magnitude(EVM)and signal-to- noise ratio(SNR).By studying the relationship among EVM, SNR and bit error rate (BER),the BER can be monitored by the vector signal analyzer(VSA).In combination with coherence integration theory, a calibration scheme is given to measure demodulation loss parameter by using spectrum analyzer. It can solve the problem of traceability for HDR which is extremely important for the satellite testing system on the ground. The result of the experiment demonstrates that this method has good performance and can solve the problem of traceability for digital modulation system effectively.