Asynchronous serial communication receiving method based on 1B4B coding and protection device
An asynchronous serial communication, 1B4B technology, applied in baseband systems, synchronous/start-stop systems, digital transmission systems, etc., can solve problems such as waveform distortion, and achieve the effects of improving anti-interference, easy porting, and strong scalability
Active Publication Date: 2016-02-17
XUJI GRP +3
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Problems solved by technology
[0004] The present invention provides an asynchronous serial communication receiving method and protection device based on 1B4B encoding, aiming to solve the problem of waveform distortion during synchronous reception and transmission at the receiving end in optical fiber asynchronous serial communication
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[0023] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0024] Embodiment of protection device based on 1B4B coded communication
[0025] The protection device in this embodiment includes a communication unit, which includes a CPU, a sending module, an encoding module, a decoding module, a receiving module, a photoelectric conversion module, and a synchronous clock module, and the synchronous clock module includes an adjustable step-size counter and a time comparator .
[0026] The synchronous clock generation module is mainly realized by clock frequency division through a counter with adjustable step size, and its functional block diagram is as follows: image 3 shown.
[0027] The synchronous clock generating module, the decoding module and the receiving module in this embodiment are all realized by FPGA. FPGA is a programmable logic device. The logic circuit is reconfigured through ...
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The invention relates to an asynchronous serial communication receiving method based on 1B4B coding and a protection device. The method comprises the steps that phase difference between a data stream after 1B4B coding and a synchronous clock in decoding sampling is preset; the step length of a counter is adjusted according to the comparison result of the jump edge of the data stream after 1B4B coding and the preset time of the counter, and finally the synchronous clock having the fixed phase difference with the data stream after 1B4B coding is generated; sampling processing is performed on the data stream after 1B4B coding with the generated synchronous clock acting as a benchmark so that the decoded data stream is obtained; and a receiving clock is obtained by performing frequency division on the generated synchronous clock according to the relationship between transmission rate of the data stream before 1B4B coding and the generated synchronous clock, and sampling is performed on the decoded data stream with the receiving clock acting as the benchmark so that receiving and storage of the data stream after decoding can be realized. According to the method, the problem of waveform distortion in the synchronous receiving and transmission process of a receiving end in optical fiber asynchronous serial communication can be solved.
Description
technical field [0001] The invention belongs to the optical fiber longitudinal communication technology in the field of relay protection, in particular to an asynchronous serial communication receiving method based on 1B4B coding and a protection device. Background technique [0002] In the field of relay protection, especially high-voltage line protection, the longitudinal differential protection has become the main protection of high-voltage line protection due to its wide range, fast response speed and high reliability. The realization of longitudinal differential protection depends on the protection data transmission between the protection devices on both sides of the line. Due to the fast transmission speed and strong anti-interference ability of optical fiber, it is widely used in the longitudinal communication of line protection. The use of optical fiber for long-distance data transmission mainly adopts asynchronous serial communication. In order to solve the problem...
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Login to View More IPC IPC(8): H04L25/49
CPCH04L25/4908
Inventor 吕玄兵王振华周东杰赵会彬任华锋王晋华
Owner XUJI GRP