Code length adaptive spread spectrum modulating method and equipment in power line carrier meter reading system
A technology of power line carrier wave and meter reading system, applied in distribution line transmission system, transmission system, electrical components, etc., can solve the problems of wasting bandwidth, difficult communication and bandwidth, and inability to take into account at the same time.
Active Publication Date: 2011-07-13
北京格林伟迪科技股份有限公司 +1
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Problems solved by technology
The currently applied products are all with fixed spread spectrum code length. Although it is easy to implement the spread spectrum communication method with fixed spread spectrum code length, the site with good channel will waste bandwidth, and the site with poor channel may not be able to communicate normally. Taking into account various situations, it is difficult to guarantee reliable communication and bandwidth, and has various limitations in practical applications
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[0051] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.
[0052] The main idea of the present invention is: when the concentrator needs to collect the data information of the meter reading terminal, it first tries to use a shorter spreading code to communicate with the meter reading terminal, and then gradually increases the length of the spreading code until it finds a concentrator that can Spread spectrum code for successful communication with the meter reading terminal, so that the concentrator and the meter reading terminal can communicate reliably and reduce bandwidth waste.
[0053] see figure 1 , figure 1 It is a processing flowchart of the concentrator in the embodiment of the present invention, including the following steps:
[0054] Step 101, start and set working parameters.
[0055] In this st...
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The invention provides a code length adaptive spread spectrum modulation method and code length adaptive spread spectrum modulation equipment in a power line carrier meter reading system. The method comprises the following steps of: presetting a plurality of spread spectrum codes with different lengths; when a concentrator acquires data, selecting a shorter spread spectrum code to try to perform communication with a meter reading terminal; and if a response message of the meter reading terminal is not received within a preset time period, trying to perform communication with the meter readingterminal by increasing the spread spectrum code length under the condition that the spread spectrum code is shorter than the longest spread spectrum code among a plurality of preset spread spectrum codes with different lengths, wherein if the response message of the meter reading terminal can be successfully received by one of the plurality of preset spread spectrum codes with different lengths, the communication is successful, and the spread spectrum code used by the communication is taken as a basis for selecting the spread spectrum code for the next communication. Reliable communication can be provided and bandwidth waste can be reduced simultaneously by gradually increasing the spread spectrum code length and finding a proper spread spectrum code.
Description
technical field [0001] The invention relates to the technical field of low-voltage power carrier communication, in particular to a code length self-adaptive spread spectrum modulation method and equipment in a power line carrier meter reading system. 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 a network access solution, the existing power distribution network can be used for communication without rewiring, and it provides a low-cost communication solution for the low-voltage power user's electricity information collection and management system, so it has been widely used application. The structure of the current power line carrier meter reading system is to install a concentrator under each distribution transformer, and install a meter reading terminal for e...
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IPC IPC(8): H04B1/69H04B3/54
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