Design And Implementation Of Communication Signal Simulator Based On Zynq RFSoC

With the continuous development of communication technology,various communication systems have emerged,and the electromagnetic environment is becoming increasingly complex.Especially in military non cooperative communication monitoring and other demand scenarios,there is a need to simulate the electromagnetic background to test some communication equipment.Physical simulation and computer software simulation have their limitations.Building an infield test environment based on a semi physical signal simulator has significant advantages of good simulation results and relatively low cost.In response to the above issues and requirements,this thesis has studied the principles of communication signal generation for various common modulation types at present,analyzed the shortcomings of general vector signal generation methods and time domain direct frequency shift combining in large-scale background communication signal simulation requirements,and then designed a high concurrency baseband waveform generation method based on time division multiplexing and a multi-channel efficient combining method based on frequency subband splicing,Finally,it is implemented and verified based on Zynq RFSo C.The main work of the thesis is summarized as follows:1)This thesis has studied the principle of signal generation for various modulation types,and designed and implemented a highly concurrent baseband signal generation module based on time sharing.The baseband rate selection is limited,but the number of concurrent channels is large,saving hardware resources.A modulator module specifically implemented in this article can generate 50 channels of communication baseband signals in time sharing,and can support more than ten modulation types such as AM,FM,CW,BPSK,QPSK,and 16 QAM.The baseband bandwidth is 8KHz,16 KHz,32KHz,and64 KHz.2)This thesis studies and implements a frequency shifting and combining algorithm for multi-channel signals based on frequency subband splicing,which decomposes the entire bandwidth into multiple frequency subbands and performs frequency shifting and combining step by step.Each signal processing channel can process multiple sub segments in a time-sharing manner,and dynamically truncate bits in the digital domain based on the configuration information of multiple signals,enabling the hardware module to dynamically adapt to parameter configurations in various situations,saving the bit width of the signal processing module,and maximizing the use of hardware computing accuracy and the bit width of the DAC.The frequency shifting and combining module specifically implemented in this article can support frequency shifting and combining of400 channels of communication baseband signals,with a coverage bandwidth greater than300 MHz,and a frequency shifting accuracy within 100 Hz.3)This thesis implements and verifies a communication signal simulator based on the Zynq RFSo C,an advanced software radio platform.The platform integrates resources such as ARM,FPGA,and RFDC on a single chip,and has the advantages of small size,low power consumption,and high integration,making it very suitable for the implementation of such communication devices.Finally,a verification platform was built,and functional verification of the hardware module was performed using Vivado and Matlab tools.The intermediate frequency output signal of the communication signal simulator was verified at the board level using a spectrum analyzer.