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Decoding method and decoding device

A decoding device and decoding technology are applied in the field of decoding methods and decoding devices, and can solve the problems of slow decoding speed, decoding failure, complicated encoder, etc.

Pending Publication Date: 2021-04-30
DATANG SEMICON DESIGN
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] After completing the Viterbi decoding, calculate the cyclic redundancy check (CRC) value of the specified data bit code and compare it with the CRC value sequence obtained by decoding; such as the cyclic redundancy check (CRC) value of the specified data bit code If the CRC value sequence obtained by the code is the same, the decoding is successful; if the CRC value of the specified data bit code is different from the CRC value sequence obtained by decoding, the decoding fails; suppose the convolutional encoder of the Gallieo navigation system E5 frequency point signal The parameter of is (2,1,7), then the number m=6 of register, by formula (1) as can be seen, the state number of Viterbi decoder is 64, and this makes the coder that is used to solve E5 frequency point signal comparatively Complex, and because each page of F / NAV and I / NAV is longer, if a decoder is used to decode sequentially according to the decoding method in the related art, the decoding speed is slow and cannot meet the requirements of real-time positioning

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Embodiment Construction

[0053] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0054] The steps shown in the flowcharts of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

[0055] Figure 4 It is a flow chart of the decoding method in the embodiment of the present invention, such as Figure 4 shown, including:

[0056] Step 401, dividing the deinterleaved code symbols into sub-code symbols of the first preset number of gro...

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Abstract

The invention discloses a decoding method and a decoding device. The decoding method comprises the following steps: dividing a deinterleaved code symbol into sub-code symbols of a first preset number of groups; according to the one-to-one correspondence relationship, respectively inputting the sub-encoders of each divided group into each pre-configured decoder; after all decoder outputs are combined according to the sequence of the input decoders, performing cyclic redundancy check on bit streams obtained through combination. According to the embodiment of the invention, the decoding speed is improved.

Description

technical field [0001] This article relates to but not limited to satellite navigation technology, especially a decoding method and a decoding device. Background technique [0002] Galileo (Gallieo) satellite navigation system is a global satellite navigation and positioning system (GNSS) independently designed in Europe for civil purposes; according to the difference in the nominal center carrier frequency, the Gallieo satellite navigation system is divided into three frequency point signals: frequency point (E)1 signal (E1 frequency point signal), E6 frequency point signal, E5 frequency point signal. Due to its own characteristics and special modulation mode, the E5 frequency point signal becomes the most special bandwidth signal in GNSS. The E5 frequency signal modulates the Free Navigation (F / NAV) message for navigation and the Integrity (I / NAV) message for navigation and integrity judgment. With the rapid development of GNSS and the close connection between positionin...

Claims

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Application Information

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IPC IPC(8): H03M13/27H03M13/23H03M13/09H03M13/29
CPCH03M13/09H03M13/235H03M13/2732H03M13/2906H03M13/2939
Inventor 宋挥师赵海龙
Owner DATANG SEMICON DESIGN