Code Block Synchronization Method of Coding CPM Signal Based on Differential Phase Waveform Matching
A waveform matching and differential phase technology, applied in phase modulation carrier systems, modulation carrier systems, digital transmission systems, etc., can solve the problem of low reliability of demodulation steps, affecting code block synchronization efficiency, and inability to make full use of code block synchronization information, etc. problem, to achieve the effect of high reliability and reliable matching results
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[0020] Combine below Figure 4 , Figure 5 with Image 6 The implementation process of the present invention will be described in detail. The CPM signal after the baseband processing is completed passes through the sliding observation window. Do the following:
[0021] ① Process the signal in the sliding observation window every other sampling period to determine whether there is a code block header warning signal bit, such as Figure 4 As shown, the sampling period is equal to the symbol period divided by the number of symbol sampling points n_Sam. The specific steps are:
[0022] Step1: Perform differential processing on the signal in the sliding observation window to obtain a differential signal. The signals in the sliding observation window are respectively delayed for n symbol periods (n=1, 2, . . . , S), and S channels of delayed signals will be obtained. The conjugate of each delayed signal is obtained, and then multiplied by the undelayed signal respectively to ...
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