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Method and system for decoding FM0 codes based on edge detection

An edge detection and encoding technology, applied in transmission systems, digital transmission systems, instruments, etc., can solve problems such as FM0 encoding and decoding

Active Publication Date: 2020-06-09
AEROSPACE INFORMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical solution of the present invention provides a method and system for decoding FMO coding based on edge detection to solve the problem of how to decode FMO coding based on edge detection

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  • Method and system for decoding FM0 codes based on edge detection
  • Method and system for decoding FM0 codes based on edge detection
  • Method and system for decoding FM0 codes based on edge detection

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Embodiment Construction

[0038] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0039] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...

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Abstract

The invention discloses a method and a system for decoding FM0 codes based on edge detection, and the method comprises the steps: obtaining the reverse rate and sampling coefficient of an FMO coding signal, and calculating the number of sampling points of a single code element in the FMO coding signal according to the reverse rate and the sampling coefficient; obtaining a maximum value and a minimum value in the FMO coded signal after single code element normalization; determining a sampling point, which is different from the maximum value and the minimum value by a preset threshold value, inthe FMO coded signal as a rising edge or a falling edge of the FMO coded signal; judging logic alternation of the rising edge and the falling edge until no effective signal exists in the FMO coded signal; when the effective signal does not exist in the FMO coded signal, removing an abnormal sampling point in the FMO coded signal; and decoding the FMO coded signal of which the abnormal sampling point is removed.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more specifically, to a method and system for decoding based on edge detection FMO coding. Background technique [0002] FM0 encoding is widely used in ETC because of its convenient bit synchronization extraction, narrow spectrum bandwidth, and simple implementation circuit. The line FM0 decoding module is an important part of the baseband circuit of the ETC system. This paper is based on the vehicle-mounted unit (0n board unit, OBU) and the roadside unit (Road side unit, RSU) short-distance two-way communication, in order to improve the purpose of FM0 decoding speed, according to the FM0 coding principle, in the FPGA software environment, use the advanced hardware description language VHDL to realize FM0 decoding Design the device, give the program code, simulate in the Quartus II environment, and observe the waveform through the logic analyzer. Under the same functio...

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Application Information

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IPC IPC(8): H04L1/00G07B15/06
CPCH04L1/0056G07B15/063
Inventor 张隆基
Owner AEROSPACE INFORMATION