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
Active Publication Date: 2021-01-15
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
Since these methods rely on demodulation information, code block header synchronization must be completed after demodulation when using these methods, and modulation index synchronization and timing synchronization cannot make full use of code block synchronization information
In addition, in the case of low signal-to-noise ratio, the reliability of the demodulation step is low, which affects the subsequent code block synchronization efficiency
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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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The invention provides a coding CPM signal code block synchronization method based on differential phase waveform matching. The synchronization method is characterized in that the following operationsare performed on a CPM signal after baseband processing through one sliding observation window: 1, processing the signal in the sliding observation window every one sampling period, determining whether a code block head early-warning signal bit exists; and 2, in performing the operation 1, and determining an output code block head mark signal according to the arriving interval of the code block head early-warning signal bit. The coding CPM signal code block synchronization method is advantageous in that the signal after baseband processing is directly processed, regular synchronization and modulation of index synchronization information are not required; 2, a matching result is obtained through matching a received whole signal with a local whole signal which is generated by means of a code block head sequence, thereby realizing relatively high reliability; 3, the method is suitable for a full-response of the CPM signal and is suitable for partial response of the CPM signal; and 4, normal operation of the method can be realized on the condition of certain residual phase offset, frequency offset and phase noise.
Description
technical field [0001] The invention relates to the technical field of wireless communication and remote measurement and remote control, and provides a coding CPM (Continuous Phase Modulation, continuous phase modulation) code block synchronization method. Background technique [0002] The CPM signal has the characteristics of continuous phase, and has great advantages in power efficiency and bandwidth efficiency compared with other modulation methods, and has broad application prospects in the fields of satellite communication, telemetry and remote control. According to the partial response length L of the CPM signal, the CPM signal can be divided into a full response CPM signal (at this time L=1) and a partial response CPM signal (at this time L>1), the partial response CPM signal has memory, and the current symbol period The inner waveform is not only related to the symbols in the current symbol period, but also related to the symbols in the previous symbol periods. P...
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IPC IPC(8): H04L27/20H04L27/18
CPCH04L27/18H04L27/2003
Inventor 王世练赖鹏辉彭聪王昊张炜马艳敏吴岭张金荣谢顺钦周锞谢滔
Owner NAT UNIV OF DEFENSE TECH
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