Synchronous signal generating method and device of power line carrier communication system
A power line carrier and synchronization signal technology, applied in the direction of synchronization device, distribution line transmission system, transmission system, etc., can solve the problem that the synchronization signal cannot meet the accurate synchronization of the transmitter and the receiver, strong anti-noise, impedance mismatch multipath, The problem of large impedance transformation, etc., achieves the effects of good auto-correlation and cross-correlation performance, convenient and adjustable frequency range, and accurate synchronization of data symbols.
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[0025] The present invention will be further described in detail below in conjunction with specific embodiments and with reference to the drawings.
[0026] Such as figure 1 As shown, the synchronization signal generation method of the power line carrier communication system in this specific embodiment is used to generate the number of segments N=7, the signal amplitude is B=1, and the signal modulation time of each segment is T 0 =128×10 -6 s, a synchronous signal with a frequency range of 10~50kHz (ie f 1 =10kHz, f 2 =50kHz). The generation method includes the following steps:
[0027] Step 101), introduce a modulated signal P with a code length of N=7, P={a 0 ,a 1 ,B,a N-1 }, where a i =±1. The length of the synchronization signal to be generated in this embodiment is 7, that is, the length of the selected modulation signal is also 7. In this embodiment, the Barker code is used as the modulation signal, P={+1,+1,+1,-1 ,-1,+1,-1}. It should be noted that the modulated signal ha...
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