CN106330800B - A kind of fast physical layer scrambling code parameter searching method based on frequency pilot sign - Google Patents
A kind of fast physical layer scrambling code parameter searching method based on frequency pilot sign Download PDFInfo
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- CN106330800B CN106330800B CN201610710636.4A CN201610710636A CN106330800B CN 106330800 B CN106330800 B CN 106330800B CN 201610710636 A CN201610710636 A CN 201610710636A CN 106330800 B CN106330800 B CN 106330800B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000011084 recovery Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 238000012937 correction Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 244000144992 flock Species 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
- H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
- H04N21/6193—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving transmission via a satellite
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Radio Relay Systems (AREA)
Abstract
The present invention relates to a kind of fast physical layer scrambling code parameter searching method based on frequency pilot sign.Traditional physical layer scrambling code parameter searching method uses the hypothesis heuristic based on channel error correction, and the overlong time that this method is attempted every time causes total search time too long.The method of the present invention parameter initialization first, channel demodulation is carried out to satellite received signal, the search for pilots section in the data frame of channel demodulation output, L pilot of Coutinuous store, then n value is successively placed in physical layer scrambling code sequence generators, physical layer scrambler sequence is generated, descrambling operation is carried out to the pilot load stored according to physical layer scrambler sequence, calculates the mould M of descrambling accumulated valuen, by comparing MnIt is judged with preset decision threshold.It can be limited within 1 second using the method for the present invention search time, substantially reduce search time.
Description
Technical field
The invention belongs to Digital TV Receiving technical fields, are related to a kind of fast physical layer scrambling code ginseng based on frequency pilot sign
Number searching method.
Background technique
DVBS2 standard (European second generation satellite digital TV transmission standard) uses the technical system by frame transmission, is
Transmission energy is adequately dispersed in institute's bandwidth allocation, the data that transmitting terminal issues are by a series of processing and in physics
After layer framing, it is also necessary to which the scrambler sequence generated according to physical layer scrambling generator carries out each transmission symbol in physical frame
Random phase rotation.It is 0≤n≤262141 that physical layer scrambling generator, which needs the value range of parameter a n, n,.Pass through setting
The available different scrambler sequence of different n, n sets 0 under default condition.If n is set non-zero value by transmitting terminal, connect
Receipts machine needs voluntarily to search for the parameter, otherwise can not correctly descramble to data frame, also can not just recover transmitting terminal hair
Data out.
Typical DVBS2 satellite receiver is as shown in Figure 1, satellite-signal is sent into the demodulation of channel demodulation module, its output
It is the physical layer data frame sequence that have passed through Timed Recovery and carrier phase recovery, which is sent to channel error correction module according to vacation
Fixed physical layer scrambling code parameter n carries out error correction, and the data after error correction are exported to subsequent processing.
The searching method of traditional physical layer scrambling code parameter n uses the hypothesis heuristic based on channel error correction, it is first assumed that 1
A n value is placed in channel error correction module, and attempts the output to channel demodulation module and carry out error correction, if error correction procedure unsuccessfully illustrates
It is assumed that n value it is incorrect, replace and next attempted again.The shortcomings that this method, is the overlong time attempted every time, one
As in hundreds of milliseconds of magnitudes, if 262142 kinds of possible values all attempted one time, the time of cost is generally several small
When differed to 1 day time.Occasion limited for search time, this method are not applicable.
Summary of the invention
It is disturbed in view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of fast physical layer based on frequency pilot sign
Code parameter searching method.
Specific implementation step of the invention are as follows:
Step 1, parameter initialization: setting physical layer scrambling code sequence generators parameter n is 0, the pilot tone stored needed for being arranged
Decision threshold T is arranged in section number L, L≤9；
Step 2 carries out channel demodulation to satellite received signal, and the output of channel demodulation is to have passed through Timed Recovery and carrier wave
The physical layer data frame sequence of phase recovery；
Step 3, the search for pilots section in the data frame of channel demodulation output, successively store L section since pilot 1,
The data type of storage is plural number, is denoted as pilot load Cmn(i), wherein m is pilot serial number, and i is to accord in each pilot
Number serial number, m=1,2,3 ..., L, i=1,2,3 ..., 36；
N value is placed in physical layer scrambling code sequence generators, and scrambling code sequence generators is resetted by step 4, and generation corresponds to
The physical layer scrambler sequence R of L pilotmn(i), the production method of physical layer scrambler sequence uses European second generation satellite digital
The method that TV transmission standards (DVBS2 standard) provide；
Step 5, according to physical layer scrambler sequence Rmn(i) to the pilot load C stored in step 3mn(i) descrambled
Operation, the method that de-scrambling method uses European second generation satellite digital TV transmission standard (DVBS2 standard) to provide calculate descrambling
Accumulated value Sn:
Wherein × it is complex multiplication；
Step 6 calculates SnMould Mn；
Step 7 compares MnValue and preset decision threshold T, judge: if Mn< T illustrates currently used n not
Correctly, it needs the value+1 of n, and goes to step 4 and carry out next round calculating；If Mn>=T illustrates that currently employed n value is correct,
Complete the search of n value.
The method of the present invention uses the hypothesis heuristic based on frequency pilot sign, increases parameter n search mould in receivers
Block can directly obtain correct n by the calculating of search module, can be straight by correct n value merging channel error correction module
It practices midwifery raw output data, the frequency pilot sign of DVBS2 is utilized in the search process of parameter n, and frequency pilot sign is the definition of DVBS2 standard
The special symbol of one kind, be mainly used for the recovery for assisting channel demodulation module to carry out carrier wave and phase.Utilize the method for the present invention
Search time can be limited within 1 second, substantially reduce search time.
Detailed description of the invention
Fig. 1 is typical satellite receiver schematic diagram；
Fig. 2 is the satellite receiver schematic diagram for having used the method for the present invention；
Fig. 3 is the physical frame schematic diagram comprising pilot；
Fig. 4 is the flow diagram of the method for the present invention.
Specific embodiment
A kind of fast physical layer scrambling code parameter searching method based on frequency pilot sign is tried using the hypothesis based on frequency pilot sign
Spy method.As shown in Fig. 2, increasing parameter n search module in receivers, can be directly obtained just by the calculating of search module
Correct n value merging channel error correction module can directly be generated output data by true n, and the search process of parameter n utilizes
The frequency pilot sign of DVBS2, frequency pilot sign are the special symbols of one kind that DVBS2 standard defines, are mainly used for assisting channel solution
Mode transfer block carries out the recovery of carrier wave and phase.Frequency pilot sign, which flocks together in the form of section, to be occurred, and a pilot includes 36
A frequency pilot sign, after first pilot appears in 1440 data symbols, later every 1440 data symbol insertions one
The format of a pilot, the frame containing pilot tone is as shown in Figure 3.
A representational DVBS2 satellite digital television receiving system is chosen with reference to the accompanying drawing to of the invention specific
Embodiment is illustrated, as shown in Figure 4.In this embodiment, the symbol energy of channel demodulation output has been normalized to P,
Specific implementation step is as follows:
Step 1, parameter initialization, setting physical layer scrambling code sequence generators parameter n are 0, the pilot tone stored needed for being arranged
Section number L=9, is arranged decision threshold
Step 2 carries out channel demodulation to satellite received signal, and the output of channel demodulation is to have passed through Timed Recovery and carrier wave
The physical layer data frame sequence of phase recovery；
Step 3, the search for pilots section in the data frame of channel demodulation output, successively store L section since pilot 1,
The data type of storage is plural number, is denoted as pilot load Cmn(i), wherein m is pilot serial number, and i is to accord in each pilot
Number serial number, m=1,2,3 ..., L, i=1,2,3 ..., 36；
N value is placed in physical layer scrambling code sequence generators, and scrambling code sequence generators is resetted by step 4, and generation corresponds to
The physical layer scrambler sequence R of L pilotmn(i), the side that the production method of physical layer scrambler sequence uses DVBS2 standard to provide
Method；
Step 5, according to physical layer scrambler sequence Rmn(i) to the pilot load C stored in step 3mn(i) descrambled
Operation, the method that de-scrambling method uses DVBS2 standard to provide calculate descrambling accumulated value Sn:
Wherein × it is complex multiplication；
Step 6 calculates SnMould Mn；
Step 7 compares MnValue and preset decision threshold T, judge: if Mn< T illustrates currently used n not
Correctly, it needs the value+1 of n, and goes to step 4 and carry out next round calculating；If Mn>=T illustrates that currently employed n value is correct,
Complete the search of n value.
It should be understood that examples detailed above is the description of the invention, it is rather than limiting the invention, any not surpass
Innovation and creation within the scope of true spirit out, fall within the scope of protection of the present invention.
Claims (1)
1. a kind of fast physical layer scrambling code parameter searching method based on frequency pilot sign, it is characterised in that this method specific steps
It is:
Step 1, parameter initialization: setting physical layer scrambling code sequence generators parameter n is 0, the pilot stored needed for being arranged
Decision threshold T is arranged in number L, L≤9；
Step 2 carries out channel demodulation to satellite received signal, and the output of channel demodulation is to have passed through Timed Recovery and carrier phase
The physical layer data frame sequence of recovery；
Step 3, the search for pilots section in the data frame of channel demodulation output, successively store L section, storage since pilot 1
Data type be plural number, be denoted as pilot load Cmn(i), wherein m is pilot serial number, and i is symbol in each pilot
Serial number, m=1,2,3 ..., L, i=1,2,3 ..., 36；
N value is placed in physical layer scrambling code sequence generators, and scrambling code sequence generators is resetted by step 4, is generated and is corresponded to L
The physical layer scrambler sequence R of pilotmn(i), the production method of physical layer scrambler sequence is using European second generation satellite digital electricity
The method provided depending on transmission standard；
Step 5, according to physical layer scrambler sequence Rmn(i) to the pilot load C stored in step 3mn(i) descrambling operation is carried out,
The method that de-scrambling method uses European second generation satellite digital TV transmission standard to provide calculates descrambling accumulated value Sn:
Wherein × it is complex multiplication；
Step 6 calculates SnMould Mn；
Step 7 compares MnValue and preset decision threshold T, judge: if Mn< T illustrates currently used n not just
Really, it needs the value+1 of n, and goes to step 4 and carry out next round calculating；If Mn>=T illustrates that currently employed n value is correct, complete
At the search of n value；0≤n≤262141.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610710636.4A CN106330800B (en) | 2016-08-22 | 2016-08-22 | A kind of fast physical layer scrambling code parameter searching method based on frequency pilot sign |
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| CN201610710636.4A CN106330800B (en) | 2016-08-22 | 2016-08-22 | A kind of fast physical layer scrambling code parameter searching method based on frequency pilot sign |
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| CN106330800A CN106330800A (en) | 2017-01-11 |
| CN106330800B true CN106330800B (en) | 2019-10-18 |
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| CN109428678B (en) * | 2017-09-04 | 2021-12-03 | 扬智科技股份有限公司 | Physical layer frame scrambling parameter searching method and circuit |
| CN110784233B (en) * | 2019-10-31 | 2023-06-27 | 中国工程物理研究院电子工程研究所 | Physical layer scrambling code sequence recovery method in DVB-S2 standard |
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| CN101052229A (en) * | 2006-04-07 | 2007-10-10 | 美国博通公司 | Method and system for processing signal in communication system |
| CN101141139A (en) * | 2006-12-18 | 2008-03-12 | 中兴通讯股份有限公司 | Cell searching system in WCDMA mobile communication system |
| CN101193087A (en) * | 2007-12-27 | 2008-06-04 | 北京创毅视讯科技有限公司 | Signal capturing method |
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2016
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| CN101052229A (en) * | 2006-04-07 | 2007-10-10 | 美国博通公司 | Method and system for processing signal in communication system |
| CN101141139A (en) * | 2006-12-18 | 2008-03-12 | 中兴通讯股份有限公司 | Cell searching system in WCDMA mobile communication system |
| CN101193087A (en) * | 2007-12-27 | 2008-06-04 | 北京创毅视讯科技有限公司 | Signal capturing method |
| CN102075473A (en) * | 2009-11-19 | 2011-05-25 | 扬智电子（上海）有限公司 | Blind descrambling method and relevant device thereof and descrambling method |
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Address after: No. 90 Wensan Road, Xihu District, Hangzhou City, Zhejiang Province, 310012 Patentee after: Hangzhou Guoxin Microelectronics Co.,Ltd. Country or region after: China Address before: No. 90 Wensan Road, Xihu District, Hangzhou City, Zhejiang Province, 310012 Patentee before: HANGZHOU NATIONALCHIP SCIENCE & TECHNOLOGY Co.,Ltd. Country or region before: China |