| With the rapid development of communication technology,people have higher and higher requirements for signal spectrum utilization and security.QAM signal and frequency hopping signal are widely used because of their higher spectrum utilization and stronger security.For higher spectrum utilization and security,the QAM signals and frequency hopping system are developing towards higher and higher modulation order and more and more complex systems,which directly leads to increase difficulty in the synchronization process of signal analysis by the signal analyzer.Synchronization technology is represented by carrier synchronization and timing synchronization in QAM signal,and the calculation of time parameters and frequency parameters in frequency hopping system.The accuracy of synchronization directly determines the accuracy of signal testing in the signal analyzer.Therefore,it is of great significance to the research and development of the signal analyzer to realize the calculation of the synchronization time-frequency parameters of the frequency hopping system and the synchronization of the high-order QAM signal in the vector signal analyzer.Aiming at the requirement of synchronization technology in the signal demodulation analysis in the signal analyzer,starting from the baseband model of the signal,combined with the specific use environment of the signal analyzer,this thesis focuses on the synchronization algorithm suitable for the signal analyzer.The specific work of this thesis is summarized as follows:At first,Timing synchronization related technologies are studied.According to the characteristics of the signal analyzer,the timing synchronization technology is studied,the design of the timing synchronization algorithm of the high-order QAM signal in the signal analyzer and the calculation of the synchronization time parameters of the frequency hopping signal are completed.The simulation results show that the timing synchronization algorithm studied in this thesis can achieve high-precision timing synchronization for the highest 1024QAM signal,and the bit error rate can reach the order of 1×10-5 when Eb/No is 20d B;The error between the estimation result of the synchronization time parameter of the frequency hopping signal and the measurement result of the R&S related instrument is less than 0.1%.Secondly,The carrier synchronization correlation technology is studied.The carrier synchronization algorithm in the signal analyzer is studied,and the design of the carrier synchronization algorithm for the high-order QAM signal and the calculation of the synchronization frequency parameters of the frequency hopping signal are completed in the signal analyzer.The simulation results show that the carrier synchronization technology proposed in this thesis can achieve the bit error rate of 1×10-4 for 1024QAM signal when Eb/No is 20d B;It can realize the calculation of the instantaneous frequency and the standard state frequency of the frequency hopping signal in the signal analyzer,and the calculation result is smoother and less jitter than that of the R&S related instrument;The calculation of the standard state frequency can be adjusted in real time according to the signal input,which is convenient for users to operate.Finally,the cascade of synchronization system and instrument application are realized.Design the synchronization system verification scheme and verify the algorithm.The results show that the cascaded system can achieve high-precision synchronization for512QAM with low signal-to-noise ratio,When Eb/No is 25d B,the bit error rate can reach10-6 order of magnitude;The synchronous time-frequency parameter estimation algorithm for the frequency hopping signal is realized by C++and integrated into the actual instrument for testing,The test results show that the algorithm can be used in the signal analyzer to calculate the parameters of the actual signal,and the calculation results can reach the same accuracy as R&S related instruments.On this basis,23 parameters such as the power parameter and the deviation parameter of the frequency hopping signal are calculated and realized by C++. |
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