FEC coding IP core for LEO satellite VCM data transmission system

A coding and satellite technology, which is applied in the field of satellite communication and channel coding, can solve problems such as the inability to meet the high-speed application requirements of Gbps throughput, and achieve the effects of improving resource utilization, shortening coding delay, and low resource consumption

Pending Publication Date: 2020-08-28
NAT SPACE SCI CENT CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the existing FEC coding IP core cannot meet the high-speed application requirements of Gbps throughput, thereby providing a high-speed FEC coding IP core suitable for LEO satellite VCM data transmission system

Method used

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  • FEC coding IP core for LEO satellite VCM data transmission system
  • FEC coding IP core for LEO satellite VCM data transmission system
  • FEC coding IP core for LEO satellite VCM data transmission system

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Embodiment Construction

[0044] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0045] The present invention provides a high-speed FEC coding IP core suitable for LEO satellite VCM data transmission system, wherein, the DVB-S2 standard supports 28 kinds of VCM modes, adopts the error correction coding scheme of cascading BCH code and LDPC code, and supports 1 / 4, 1 / 3, 2 / 5, 1 / 2, 3 / 5, 2 / 3, 3 / 4, 4 / 5, 5 / 6, 8 / 9, 9 / 10 a total of 11 code rates; available Modulation methods include: QPSK, 8PSK, 16APSK, 32APSK; and the lengths of two coded data frames (FECFREAM) are 16200 and 64800 respectively, both of which support these 28 coded modulation methods.

[0046] Such as figure 1 As shown, the FEC encoding IP core of the present invention includes a high-speed TLK2711 input buffer FIFO, a BCH encoding module, an LDPC encoding module, a parallel bit interleaving module and an output buffer FIFO.

[0047] The FEC encoding IP core s...

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Abstract

The invention discloses an FEC coding IP core for an LEO satellite VCM data transmission system. The FEC coding IP core comprises an input cache module, a BCH coding module, an LDPC coding module, a parallel bit interleaving module and an output cache module, wherein the input cache module is used for receiving and caching to-be-coded information bits and VCM mode parameters set by a user; the VCMmode comprises a code rate R, a coding frame length L and a modulation mode; the BCH coding module is used for performing BCH coding on the kbch information bits according to a DVB-S2 standard, generating a code word with the length of nbch, and transmitting coded information to the LDPC coding module; the LDPC coding module is used for performing LDPC coding on the kldpc information bits according to a DVB-S2 standard to generate a code word with the length of nldpc; kldpc is equal to nbch, nldpc is equal to L, and the information bits and check bits are output to the parallel bit interleaving module in parallel in sequence; and the parallel bit interleaving module is used for realizing row and column interleaving required by a modulation mode in the DVB-S2 standard, and the coded and interleaved code words are transmitted to the output cache module in a symbol form for caching.

Description

technical field [0001] The invention relates to the field of satellite communication and channel coding, in particular to a Forward Error Correction (FEC) coding IP core suitable for a Low Earth Orbit (LEO) satellite Variable Code Modulation (VCM) data transmission system. Background technique [0002] With the development of high-resolution payloads, the downlink earth link data transmission system needs to transmit more and more data within the limited satellite visible time. Due to being close to the earth's surface and being able to traverse the globe, most remote sensing satellites are deployed in low Earth orbit (LEO, low Earth orbit) to provide higher observation clarity. During the satellite transit process, the distance between the satellite and the ground station changes with the elliptical orbital movement of the LEO satellite. LEO satellites usually adopt constant coding modulation (CCM) data transmission system, which designs the coding and modulation mode acco...

Claims

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Application Information

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IPC IPC(8): H03M13/11H04L1/00
CPCH03M13/1151H04L1/0071Y02D30/70
Inventor 康婧安军社
Owner NAT SPACE SCI CENT CAS
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