The transmitting part of the system generates a chaotic FM carrier signal by a Lorenz chaotic circuit and a FM circuit, and realizes differential delay and modulation in the FPGA after sampling; the receiving part is based on the incoherent correlation method, and the bit synchronization module uses the correlation value and energy ratio as the timing measurement, and finds the initial synchronization by setting the threshold and sliding search window, and then introduces a digital phase-locked loop to perform correlation peak tracking and bit synchronization adjustment.
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