CN110401510A - A kind of demodulator that can be changed frame by frame suitable for carriers rate and modulation coding scheme - Google Patents

A kind of demodulator that can be changed frame by frame suitable for carriers rate and modulation coding scheme Download PDF

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CN110401510A
CN110401510A CN201910663777.9A CN201910663777A CN110401510A CN 110401510 A CN110401510 A CN 110401510A CN 201910663777 A CN201910663777 A CN 201910663777A CN 110401510 A CN110401510 A CN 110401510A
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module
data
frame
frame head
48msps
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CN110401510B (en
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李新玲
崔霞霞
苟晓刚
何朝玉
王少飞
宋艳军
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CETC 54 Research Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

A kind of demodulator that can be changed frame by frame suitable for carriers rate and modulation coding scheme of the present invention, including AD sampling module, CIC module, matched filtering module, frame head search module, data transformation module, data combining module, timing recovery module, carrier recovery block, despreading module, De-mapping module, decoding module and signaling resolution module.Present invention baseband signal first carries out the integral multiple clock of AD sampling symbolization kind, then is extracted respectively by the CIC of different multiples, carries out clock matches, and carries out matched filtering and frame head search respectively.After searching out 24Msps frame head, 24Msps data are transformed to 48Msps data mode, are timed recovery together with 48Msps in a burst mode, carrier auxiliary, despreading, demapping and decoding, by signaling resolution, it can be achieved that demodulator is to the adaptive demodulation of different data mode.The present invention has the characteristics that processing flexibility, strong applicability and applicable site type are wide, communication of the big, type of business mostly between different site types suitable for the traffic satellite communication field.

Description

A kind of demodulator that can be changed frame by frame suitable for carriers rate and modulation coding scheme
Technical field
The present invention relates to demodulator design fields, more particularly to one kind to be suitable for carriers rate and modulation coding scheme frame by frame Variable demodulator, especially suitable for transmission contains much information, platform type is more, more than business datum type in satellite communication system Transmission system improves the utilization rate and efficiency of transmission of transmission.
Background technique
Satellite communication system is to guarantee the reliability of information transmission, when doing link budget, according to poor channel condition It is designed, using fixed signal transfer mode.As business demand increases, in order to maximally utilise channel capacity, The information data that high-speed transfer multiple types merge on limited frequency spectrum resource improves frequency spectrum benefit of the system in fading channel With rate, just transmission rate must be made to change with the variation of channel capacity.To the requirement of the signal format of transmission: according to frame structure into Row is sent；Frame structure flexibility and changeability, carriers rate, modulation, coding mode can be changed frame by frame.Demodulator is just needed for this frame knot Structure carries out adaptive demodulation, and guarantee is properly received whole business datums.
Summary of the invention
The technical problem to be solved by the present invention is to design, one kind being suitable for carriers rate and modulation coding scheme frame by frame may be used The demodulator of change can demodulate the business datum of different carriers rate different modulating coding modes frame by frame.
The technical solution adopted by the present invention are as follows:
A kind of demodulator that can be changed frame by frame suitable for carriers rate and modulation coding scheme, comprising: AD sampling module, first CIC module, the first matched filtering module, the second matched filtering module, searches 24M frame head processing module, searches 48M at the 2nd CIC module Frame head processing module, data transformation module, data combining module, timing recovery module, carrier recovery block, despreading module, solution Mapping block, decoding module and signaling resolution module；
AD sampling module carries out high sampling, sampling to received baseband signal by the way of the processing of 8 road signal parallels Signal afterwards is exported respectively to the first CIC module and the 2nd CIC module；
It is the 8 road parallel signals that sampling clock is 24MHz, output to the first matching that first CIC module, which will receive signal extraction, Filter module；
It is the 8 road parallel signals that sampling clock is 48MHz, output to the second matching that 2nd CIC module, which will receive signal extraction, Filter module；
First matched filtering module is filtered the 8 road parallel signals that the sampling clock received is 24MHz rear defeated Out to searching 24Msps frame head processing module；
Second matched filtering module is filtered the 8 road parallel signals that the sampling clock received is 48MHz rear defeated Out to searching 48Msps frame head processing module；
24Msps frame head processing module is searched according to 1024 priori symbolic information of carriers rate 24Msps frame head, utilizes PN The correlation properties of sequence carry out correlation to 1024 priori symbolic information of the 8 road parallel signal frame heads of 24MHz respectively and add up, when When accumulated value is greater than threshold value, 24Msps frame head is searched out, and the parallel data after frame head will be marked to export to data transformation module；
48Msps frame head processing module is searched according to 1024 priori symbolic information of carriers rate 48Msps frame head, utilizes PN sequence The correlation properties of column carry out correlation to 1024 priori symbolic information of the 8 road parallel signal frame heads of 48MHz respectively and add up, when tired It is value added when being greater than threshold value, search out 48Msps frame head, and the parallel data after frame head will be marked to export to data and be combined module；
Output to data are combined module after 24Msps continuous data is become the bursty data of 48Msps by data transformation module；
Data and 48Msps data are combined processing after data combining module changes 24Msps, by the data after combining It exports to timing recovery module；
The data received are carried out clock recovery by timing recovery module, are taken 4096 data to carry out a square timing error and are estimated Meter, interpolation go out optimum sampling point, optimum sampling point data are exported to carrier recovery block；
Carrier recovery block is estimated in optimum sampling point data frame part using 128 pilot portions at intraframe data both ends Phase, completes the real-time carrier phase compensation of data frame between two pilot tones, and data after carrier auxiliary are sent into despreading module；
Despreading module carries out despreading processing to the spread spectrum data for including in the frame of data after carrier auxiliary, after despreading is handled Data export to De-mapping module；
De-mapping module carries out soft de-mapped to the code block of different modulating mode in despreading treated data frame by frame, will be soft Data after demapping are exported to decoding module；
Decoding module is decoded and is exported frame by frame to the data after soft de-mapped；
Signaling resolution module parses the signaling information obtained after decoding, and every frame signaling is stored in ram one by one, right It de-spreads module, De-mapping module and decoding module and carries out parameter setting, to adapt to different spreading ratios, different modulating and coding mode Data demodulation.
Compared with the background technology, the present invention, it has the advantages that
(1) information rate that can be demodulated is 3Mbps-155Mbps, and applied widely, message capacity is big；
(2) demodulation for supporting the data splitting frame structure of overloading wave speed and more modulation coding mode, is applicable in different Application scenarios and channel condition improve the availability and efficiency of transmission of transmission link.
Detailed description of the invention
Fig. 1 is the business data frame format frame structure principle chart that the present invention designs.
Fig. 2 is demodulator design schematic diagram of the invention.
Specific embodiment
The invention will now be described in further detail with reference to the accompanying drawings.
Business datum frame structure includes frame head, signaling, protection and a variety of carrier datas referring to Fig.1.Frame head and signaling carry out 8 It spreads again, guarantees that demodulator can also normally receive when channel condition is deteriorated.Signaling be used to indicate each carrier wave signal format and Position in frame.Carriers rate includes 24Msps and two kinds of 48Msps.Whole frame is inserted into the pilot tone of 128 symbols every 8064 symbols Signal.
Referring to Fig. 2, a kind of demodulator that can be changed frame by frame suitable for carriers rate and modulation coding scheme of the present invention, comprising: AD sampling module 1, the 2nd CIC module 3, the first matched filtering module 4, the second matched filtering module 5, is searched at the oneth CIC module 2 24Msps frame head processing module 6, search 48Msps frame head processing module 7, data transformation module 8, data combining module 9, timing it is extensive Multiple module 10, carrier recovery block 11, despreading module 12, De-mapping module 13, decoding module 14 and signaling resolution module 15；
AD sampling module 1 samples received baseband signal, parallel using 8 tunnels in sampling clock 1152MHz, FPGA Processing, every road clock are 144MHz.Sampled signal pass through respectively the first CIC module 2 and the 2nd CIC module 3 extract Bu Tong again Several clocks carries out clock matches from different carriers rates, and passes through the first matched filtering module 4 and the second matched filtering respectively Module 5, then respectively by searching 24Msps frame head processing module 6 and searching 48Msps frame head processing module 7.Search out 24Msps frame head Afterwards, 24Msps data are become into 48Msps data mode by data transformation module 8 in a burst mode.Again with 48Msps carrier number It is combined module 9 according to by data, carries out subsequent demodulation processing by 48Msps data.After timed recovery module 10, using Carrier recovery block 11 de-spreads module 12, De-mapping module 13 and decoding module 14, most afterwards through signaling resolution module 15.
Concrete processing procedure is as follows:
The effect of AD sampling module 1 is to be sampled by the way of the processing of 8 road signal parallels to received baseband signal, Signal after sampling is exported respectively to the first CIC module and the 2nd CIC module；
It is the 8 road parallel signals that sampling clock is 24MHz, output to the first matching that first CIC module 2, which will receive signal extraction, Filter module；
It is the 8 road parallel signals that sampling clock is 48MHz, output to the second matching that 2nd CIC module 3, which will receive signal extraction, Filter module；
First matched filtering module 4 is filtered the 8 road parallel signals that the sampling clock received is 24MHz rear defeated Out to searching 24Msps frame head processing module；
Second matched filtering module 5 is filtered the 8 road parallel signals that the sampling clock received is 48MHz rear defeated Out to searching 48Msps frame head processing module；
24Msps frame head processing module is searched according to 1024 priori symbolic information of carriers rate 24Msps frame head, utilizes PN The correlation properties of sequence carry out correlation to 1024 priori symbolic information of the 8 road parallel signal frame heads of 24MHz respectively and add up, when When accumulated value is greater than threshold value, 24Msps frame head is searched out, and the parallel data after frame head will be marked to export to data transformation module；
48Msps frame head processing module is searched according to 1024 priori symbolic information of carriers rate 48Msps frame head, utilizes PN sequence The correlation properties of column carry out correlation to 1024 priori symbolic information of the 8 road parallel signal frame heads of 48MHz respectively and add up, when tired It is value added when being greater than threshold value, search out 48Msps frame head, and the parallel data after frame head will be marked to export to data and be combined module；
Output to data are combined mould after 24Msps continuous data is become the bursty data of 48Msps by data transformation module 8 Block；
Data and 48Msps data are combined processing after data combining module 9 changes 24Msps, by the number after combining According to output to timing recovery module；
The data received are carried out clock recovery by timing recovery module 10, and 4096 data is taken to carry out square timing error Estimation, interpolation go out optimum sampling point, optimum sampling point data are exported to carrier recovery block；
Carrier recovery block 11 is estimated in optimum sampling point data frame part using 128 pilot portions at intraframe data both ends Phase is calculated, the real-time carrier phase compensation of data frame between two pilot tones is completed, data after carrier auxiliary are sent into despreading module；
Despreading module 12 carries out despreading processing to the spread spectrum data for including in frame, will despreading treated that data are exported to solution Mapping block；
The effect of De-mapping module 13 be the code block of different modulating mode in despreading treated data is carried out frame by frame it is soft Demapping, by the data output shaft decoding module after soft de-mapped；Can support BPSK QPSK 8PSK the more modulation side 16APSK Formula；
The effect of decoding module 14 is that the data after soft de-mapped are decoded and exported frame by frame；LDPC is supported to decode code A length of 8064, code rate 1/2,3/4,7/8 3 kind.
The effect of signaling resolution module 15 is to parse the signaling information obtained after decoding, and every frame signaling is deposited one by one Enter in ram, when next frame data demodulation, parameter setting is carried out to despreading module, De-mapping module and decoding module, to adapt to The data demodulation of different spreading ratios, different modulating and coding mode.
The information rate that demodulator of the present invention is supported is 3Mbps-155Mbps, supports 24Msps and 48Msps carriers rate While demodulate, support spreading ratio be 1,2,4,8 spread spectrum data demodulate, support more kinds of 16APSK of BPSK QPSK 8PSK tune Mode processed supports that LDPC decoding code length is 8064, code rate 1/2,3/4,7/8 3 kind.Demodulator supports any of the above in a frame The demodulation of one or more carriers rates and the data pattern of modulation coding scheme combination, supports data pattern to can be changed frame by frame.

Claims (1)

1. a kind of demodulator that can be changed frame by frame suitable for carriers rate and modulation coding scheme characterized by comprising AD sampling Module, the 2nd CIC module, the first matched filtering module, the second matched filtering module, searches the processing of 24M frame head at the first CIC module Module searches 48M frame head processing module, data transformation module, data combining module, timing recovery module, carrier recovery block, solution Expand module, De-mapping module, decoding module and signaling resolution module；
AD sampling module carries out high sampling to received baseband signal by the way of the processing of 8 road signal parallels, after sampling Signal is exported respectively to the first CIC module and the 2nd CIC module；
It is the 8 road parallel signals that sampling clock is 24MHz, output to the first matched filtering that first CIC module, which will receive signal extraction, Module；
It is the 8 road parallel signals that sampling clock is 48MHz, output to the second matched filtering that 2nd CIC module, which will receive signal extraction, Module；
First matched filtering module to the sampling clock received be 24MHz 8 road parallel signals be filtered after export to Search 24Msps frame head processing module；
Second matched filtering module to the sampling clock received be 48MHz 8 road parallel signals be filtered after export to Search 48Msps frame head processing module；
24Msps frame head processing module is searched according to 1024 priori symbolic information of carriers rate 24Msps frame head, utilizes PN sequence Correlation properties 1024 priori symbolic information of the 8 road parallel signal frame heads of 24MHz are carried out respectively it is related cumulative, when cumulative When value is greater than threshold value, 24Msps frame head is searched out, and the parallel data after frame head will be marked to export to data transformation module；
48Msps frame head processing module is searched according to 1024 priori symbolic information of carriers rate 48Msps frame head, utilizes PN sequence Correlation properties carry out correlation to 1024 priori symbolic information of the 8 road parallel signal frame heads of 48MHz respectively and add up, and work as accumulated value When greater than threshold value, 48Msps frame head is searched out, and the parallel data after frame head will be marked to export to data combining module；
Output to data are combined module after 24Msps continuous data is become the bursty data of 48Msps by data transformation module；
Data and 48Msps data are combined processing after data combining module changes 24Msps, and the data after combining are exported To timing recovery module；
The data received are carried out clock recovery by timing recovery module, and 4096 data is taken to carry out square Timing error estimate, Interpolation goes out optimum sampling point, and optimum sampling point data is exported to carrier recovery block；
Carrier recovery block estimates phase using 128 pilot portions at intraframe data both ends in optimum sampling point data frame part Position, completes the real-time carrier phase compensation of data frame between two pilot tones, and data after carrier auxiliary are sent into despreading module；
Despreading module despreading processing is carried out to the spread spectrum data for including in the frame of data after carrier auxiliary, will despreading treated number According to output to De-mapping module；
De-mapping module carries out soft de-mapped to the code block of different modulating mode in despreading treated data frame by frame, and soft solution is reflected Data after penetrating are exported to decoding module；
Decoding module is decoded and is exported frame by frame to the data after soft de-mapped；
Signaling resolution module parses the signaling information obtained after decoding, every frame signaling is stored in ram one by one, to despreading Module, De-mapping module and decoding module carry out parameter setting, to adapt to different spreading ratios, different modulating and the number of coding mode According to demodulation.
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CN111600823A (en) * 2020-05-12 2020-08-28 中国电子科技集团公司第五十四研究所 High-speed parallel OQPSK offset quadriphase shift keying demodulator
CN111600823B (en) * 2020-05-12 2022-03-01 中国电子科技集团公司第五十四研究所 Parallel OQPSK offset quadriphase shift keying demodulator
CN111917679A (en) * 2020-08-12 2020-11-10 雅泰歌思（上海）通讯科技有限公司 Method for downloading timing synchronization of carrier and symbol under low signal-to-noise ratio condition
CN114844553A (en) * 2022-03-29 2022-08-02 北京航空航天大学 Single code element rate sampling method based on prior filtering for high-speed transmission
CN114844553B (en) * 2022-03-29 2023-03-10 北京航空航天大学 Single code element rate sampling method based on prior filtering and applied to high-speed transmission

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