Modulation and demodulation method and chip for low-voltage power line carrier communication system
A low-voltage power line and carrier communication technology, applied in the field of communication, can solve the problems of complex attenuation characteristics and interference characteristics of low-voltage power lines, large randomness, large time-varying, low information transmission rate, etc., to achieve strong anti-interference ability, low cost, The effect of high information transfer rate
Active Publication Date: 2019-03-12
STATE GRID HENAN ELECTRIC POWER COMPANY ANYANG POWER SUPPLY +1
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Problems solved by technology
[0003] However, the signal attenuation characteristics and interference characteristics on low-voltage power lines are very complex, and they are random and time-varying
At the same time, the existing low-voltage power line communication equipment has low information transmission rate and low transmission efficiency
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[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0024] see figure 2 and image 3 , the present invention provides a modulation and demodulation method for a low-voltage power line carrier communication system, comprising the following steps:
[0025] S1: The original information to be sent by the user end of the low-voltage power line carrier communication system is frame-encapsulated through the encapsulation module 1, and the encapsulated information is modulated by the carrier modulation module 2, and then filtered by the digital filter module 3 (BPF), and finally passed through The analog transmit front-end (AFE) circuit outputs to the low-voltage power line.
[0026] The encapsulation method of the encapsulation module 1 in step S1 is: add preamble 0x00_FF_AA_AA_AA and frame delimiter 0x6C to the original information to be sent; wherein: 0x00 is used for receiving carrier s...
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The invention discloses a modulation and demodulation method and a chip for a low-voltage power line carrier communication system, which performs frame packaging, BFSK carrier modulation, and digital filtering on the original information to be sent by a user end of the low-voltage power line carrier communication system, and finally transmits it through an analog front end. The circuit outputs to the low-voltage power line; the signal is received from the low-voltage power line, digitally filtered through a programmable digital filter, and the high-frequency and low-frequency interference information is eliminated to obtain a carrier signal near the carrier center frequency and within the information bandwidth range, which is realized by the COSTAS loop method Local carrier synchronization removes narrow pulses in the signal after carrier synchronization, performs code source synchronization on information after filtering out narrow pulses, and decapsulates code source synchronized information. The invention has the characteristics of anti-high noise, high attenuation and burst interference, can realize higher information code transmission rate and optional carrier frequency, and provides low-cost and high-performance AISC solution for PHY equipment in power line carrier communication system Program.
Description
technical field [0001] The invention belongs to the technical field of communication, and specifically relates to a modulation and demodulation method and a modulation and demodulation chip, which can be widely used in user terminals of low-voltage power line carrier communication systems, and are especially suitable for application in low-voltage power line carrier meter reading systems. Background technique [0002] Low Power Line Communication (Low PLC) refers to the technology of using the existing solid and reliable low-voltage 220V line as a communication carrier to transmit digital signals at high speed through carrier wave. This technology has the characteristics of small amount of wiring network construction, stable and reliable transmission lines, and reasonable routing. [0003] However, the signal attenuation characteristics and interference characteristics on low-voltage power lines are very complex, and they are random and time-varying. At the same time, the e...
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IPC IPC(8): H04B3/54
CPCH04B3/54
Inventor 胡占庭彭祖华王建安李岳张志峰路福庆
Owner STATE GRID HENAN ELECTRIC POWER COMPANY ANYANG POWER SUPPLY