Bimodule low-voltage carrier wave modulation method and device used for electric centralized meter reading
A centralized meter reading and carrier modulation technology, applied to electrical components, distribution line transmission systems, transmission systems, etc., can solve the problems of complex signal attenuation characteristics and interference characteristics, difficulty in ensuring communication and bandwidth, and inability to adapt, and achieve improved The effect of transmission rate and reliability
Active Publication Date: 2013-05-29
北京格林伟迪科技股份有限公司 +1
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Problems solved by technology
[0007] The signal attenuation characteristics and interference characteristics on low-voltage power lines are very complex, and they are random and time-varying. The attenuation and interference conditions of each site are different. Whether using spread spectrum or OFDM, due to their own advantages and disadvantages, they cannot adapt to all situations. situation, it is difficult to guarantee reliable communication and bandwidth
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[0038] In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0039] For the convenience of description, the concentrator and the meter reading terminal are simply divided into a management module and a carrier communication module. The communication module realizes communication at the physical layer, and the management module is responsible for high-level functions such as links, networks, and applications.
[0040] The basic idea of the present invention is to configure two kinds of modulation and demodulation circuits, spread spectrum and OFDM, in the communication module. When it is necessary to read the meter for a specific user, select one of the modulation circuits to send. Because the OFDM rate is high, when communication is required, First, use OFDM mode to send. If you can’t receive the res...
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The invention provides a bimodule low-voltage carrier wave modulation method and device used for electric centralized meter reading. The method comprises the following steps of: receiving OFDM (Orthogonal Frequency Division Multiplexing) modulation data time and spread spectrum modulation time returned by a meter reading terminal by a preset concentrator; when the concentrator is necessary to read a meter of a specific user, firstly sending in an OFDM mode, and then sending in a spread spectrum mode if a response of an opposite terminal can not be received within preset time, which means thatthe normal communication can not be performed; and simultaneously carrying out spread spectrum and OFDM signal detection with two demodulator circuits in a receiving direction, starting synchronizingand demodulating receiving data after a signal is detected, and returning the response to the concentrator. With the method, the transmission rate is increased and the transmission reliability is improved.
Description
technical field [0001] The invention relates to low-voltage power carrier communication technology, in particular to a dual-mode low-voltage carrier modulation method and device for centralized electric meter reading. Background technique [0002] Power Line Carrier (PLC) is a unique and basic communication method of the power system, which refers to the technology of high-speed transmission of analog or digital signals by using the existing power line. Using the power line as the network access solution, the existing power distribution network can be used for communication without rewiring, so it provides a low-cost communication solution for the low-voltage power user's electricity information collection and management system, and has been widely used application. However, since the low-voltage power line is used for power transmission, its non-ideal transmission channel presents a harsh channel with high noise, strong attenuation, severe load changes, large impedance cha...
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IPC IPC(8): H04B3/54H04L27/26H04B1/707
Inventor 高卫东张崙刘冬邓羽
Owner 北京格林伟迪科技股份有限公司