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LDPC (Low Density Parity Check) coding based variable medium rate frame-by-frame modulator

A modulator and rate technology, applied in the application of multi-bit parity error detection coding, error correction/detection using block codes, digital transmission systems, etc., can solve the problems of low bandwidth and power utilization, and achieve Stable and reliable performance, improved availability, and strong usability

Active Publication Date: 2015-05-13
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

[0002] The traditional modulator realizes fixed modulation bandwidth, fixed modulation mode, and fixed coding rate. In order to ensure that it can be applied in various environments, the transmission bandwidth and power are fixed. In many cases, the utilization rate of bandwidth and power is very high. Low

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  • LDPC (Low Density Parity Check) coding based variable medium rate frame-by-frame modulator
  • LDPC (Low Density Parity Check) coding based variable medium rate frame-by-frame modulator

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Embodiment Construction

[0017] Reference figure 1 , The present invention is a medium rate frame-by-frame variable modulator based on LDPC encoding, including interface frame search module 1, first signaling processing module 2, service data processing module 3, pre-encoding scrambling module 4, LDPC encoder 5, and 2. Signaling processing module 6, mapping module 7, spread spectrum module 8, framing module 9, scrambling module 10, shaping filter module 11, and digital up-conversion module 12; figure 1 It is the electrical schematic diagram of the embodiment of the medium rate frame-by-frame variable modulator based on LDPC encoding of the present invention. The embodiment is based on figure 1 Connect the line.

[0018] The function of the interface frame search module 1 based on the LDPC coded medium rate frame-by-frame variable modulator is to receive the baseband signal sent by the router; the function of the first signaling processing module 2 is to parse the signaling data; the service data processing...

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Abstract

The invention discloses an LDPC (Low Density Parity Check) coding based variable medium rate frame-by-frame modulator. The modulator comprises an interface frame searching module, a first signaling processing module, a service data processing module, a pre-coding scrambling module, an LDPC coder, a second signaling processing module, a mapping module, a frequency expansion module, a framing module, a scrambling module, a forming filter module and a digital up-converter module. According to the modulator, the baseband input data are received; a signaling is analyzed from the data; the service data processing module is controlled by the first signaling processing module to gradually code the frame to generate non-coded data to be sent to the coding module; the second signaling processing module is sued for controlling the mapping module, the frequency expansion module, the framing module, the scrambling module and the forming filter module to receive and process the coded data, and then the data are converted into frequency band signals through the digital up-converter module and then is sent out. The modulator has the advantages of being large in transmission information quantity, wide in applicable station scope, flexible to process data, high in transportability, and particularly suitable for communication under various environmental conditions between satellites or in a satellite ground as well as communication between base stations of different types.

Description

Technical field [0001] The invention can provide high transmission rate capability for a large number of users with different platforms and different purposes. The medium rate frame-by-frame variable modulator based on LDPC encoding is implemented using adaptive communication technology, which can adjust the transmission rate according to the link state to improve the availability and transmission efficiency of the transmission link. Background technique [0002] Traditional modulators achieve fixed modulation bandwidth, fixed modulation mode, and fixed coding rate. To ensure that various environments can be applied, the transmission bandwidth and power are fixed. In many cases, the bandwidth and power utilization rate is very high. low. Summary of the invention [0003] The purpose of the present invention is to avoid the deficiencies in the above-mentioned background art and provide an adaptive medium rate frame-by-frame variable modulator based on LDPC encoding. The invention...

Claims

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Application Information

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IPC IPC(8): H04L1/00H03M13/11
Inventor 宋艳军崔霞霞李聪李新玲王薇苟晓刚王立民
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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