CN106301530B - A kind of fast physical layer scrambling code parameter searching method based on sky packet - Google Patents
A kind of fast physical layer scrambling code parameter searching method based on sky packet Download PDFInfo
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- CN106301530B CN106301530B CN201610710738.6A CN201610710738A CN106301530B CN 106301530 B CN106301530 B CN 106301530B CN 201610710738 A CN201610710738 A CN 201610710738A CN 106301530 B CN106301530 B CN 106301530B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000001186 cumulative effect Effects 0.000 claims abstract description 8
- 238000011084 recovery Methods 0.000 claims description 8
- 238000009825 accumulation Methods 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 8
- 238000004891 communication Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 241000208340 Araliaceae Species 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 244000144992 flock Species 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
- 230000002688 persistence Effects 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
Classifications
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- 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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- 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
- H04B7/18523—Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service
- H04B7/18526—Arrangements for data linking, networking or transporting, or for controlling an end to end session
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- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
-
- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
- H04L1/0048—Decoding adapted to other signal detection operation in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder
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- Computing Systems (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The present invention relates to a kind of fast physical layer scrambling code parameter searching methods based on sky packet.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, it is successively extracted from the data frame of channel demodulation output and stores payload symbols section, then n value is successively placed in physical layer scrambling code sequence generators, and reset scrambling code sequence generators, physical layer scrambler sequence is generated, calculates and descrambles cumulative sequence, all descrambling accumulated values descrambled in cumulative sequence are compared with preset decision threshold T one by one finally, are judged.Physical layer scrambling code parameter can be quickly searched for using the method for the present invention, search time can be reduced within 100 seconds.
Description
Technical field
The invention belongs to Digital TV Receiving technical field, it is related to a kind of fast physical layer scrambling code parameter based on sky packet and searches
Suo Fangfa.
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
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 scrambling code ginseng based on sky packet
Number 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 frame stored needed for being arranged
Accumulation length parameter Y is arranged in number L, L≤4, and decision threshold T is arranged in Y≤736；
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 extracts payload symbols section from the data frame of channel demodulation output, is denoted as P1,P2,...,PL, each load
The length M of sign field is identical, and M is the given data obtained in channel demodulating process, successively stores P1,P2,...,PL, obtain
Symbol sebolic addressing S (i), i are the serial number of symbol in symbol sebolic addressing, i=1,2,3 ..., M × L；
N value is placed in physical layer scrambling code sequence generators, and scrambling code sequence generators is resetted by step 4, is generated length and is
The physical layer scrambler sequence R of Mn(j), j is the symbol serial number in physical layer scrambler sequence, j=1,2,3 ..., M；By Rn(j) it repeats
It stores L times and obtains sequence Qn(i), i=1,2,3 ..., M × L, sequence Qn(i) identical with the length of sequence S (i)；
Step 5 calculates the cumulative sequence D of descrambling as followsn(k):
Wherein abs () function is plural modulus operation, and k is the descrambling accumulated value serial number descrambled in cumulative sequence；
Step 6, to sequence Dn(k) all descrambling accumulated values in are compared with preset decision threshold T one by one, are made
Judgement: if sequence Dn(k) all descrambling accumulated values in are respectively less than preset decision threshold, illustrate 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 sequence Dn(k) exist in more than or equal to preset
The descrambling accumulated value of decision threshold T illustrates that currently employed n value is correct, completes the search of n value.
The method of the present invention uses the hypothesis heuristic based on sky packet, increases parameter n search module in receivers, leads to
The calculating for crossing search module can directly obtain correct n, and correct n value merging channel error correction module can be generated directly
Output data.The empty packet (i.e. MPEG2 sky packet) transmitted in DVBS2 satellite communication system is utilized in the search process of parameter n, empty
Packet is the special packet of one kind of DVBS2 satellite communication system transmission, and main feature is that its payload content is known and is all 0
Or it is all 1.Sky packet is mainly used for solving the problems, such as satellite communication transmitting terminal rate adaptation.The transmission mode of DVBS2 is QPSK
When mode, the corresponding physical layer constellation symbol of content of sky packet can flock together continuous appearance, and persistence length is 736
Symbol can quickly search for physical layer scrambling code parameter using the method for the present invention, and search time can be reduced within 100 seconds.
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 flow diagram of the method for the present invention；
Fig. 4 is position view of the load section in physical frame；
Fig. 5 is symbol sebolic addressing S (i) and sequence Qn(i) schematic diagram.
Specific embodiment
A kind of fast physical layer scrambling code parameter searching method based on sky packet, as shown in Fig. 2, increasing ginseng in receivers
Number n search module, can directly obtain correct n by the calculating of search module, and correct n value is placed in channel error correction module
Output data can be directly generated, the empty packet transmitted in DVBS2 satellite communication system is utilized in the search process of parameter n
(i.e. MPEG2 sky packet), sky packet are the special packets of one kind of DVBS2 satellite communication system transmission, and main feature is its load
Lotus content is known and is all 0 or is all 1.Sky packet is mainly used for solving the problems, such as satellite communication transmitting terminal rate adaptation.DVBS2
Transmission mode when be QPSK mode, the corresponding physical layer constellation symbol of content of sky packet can flock together it is continuous go out
Existing, persistence length is 736 symbols.
A representational DVBS2 satellite digital television receiving system is chosen with reference to the accompanying drawing to of the invention specific
Embodiment is illustrated.
In this embodiment, the symbol energy of channel demodulation output has been normalized to P, specific implementation step such as Fig. 3:
Step 1, parameter initialization: setting physical layer scrambling code sequence generators parameter n is 0, the frame stored needed for being arranged
Number L=2, is arranged accumulation length parameter Y=512, and decision threshold is arranged
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 extracts payload symbols section, the position of payload symbols section such as Fig. 4 institute from the data frame of channel demodulation output
Show, is denoted as P respectively1,P2,...,PL, the length M of each payload symbols section is identical, M be obtained in the channel demodulating process
Primary data successively stores P1,P2,...,PL, obtaining symbol sebolic addressing S (i), i is the serial number of symbol in symbol sebolic addressing, i=1,2,
3 ..., M × L, as shown in Figure 5；
N value is placed in physical layer scrambling code sequence generators, and scrambling code sequence generators is resetted by step 4, is generated length and is
The physical layer scrambler sequence R of Mn(j), j is the symbol serial number in physical layer scrambler sequence, j=1,2,3 ..., M；By Rn(j) it repeats
It stores L times and obtains sequence Qn(i), i=1,2,3 ..., M × L, sequence Qn(i) identical with the length of sequence S (i), as shown in Figure 5；
Step 5 calculates the cumulative sequence D of descrambling as followsn(k):
Wherein abs () function is plural modulus operation, and k is the descrambling accumulated value serial number descrambled in cumulative sequence；
Step 6, to sequence Dn(k) all descrambling accumulated values in are compared with preset decision threshold T one by one, are made
Judgement: if sequence Dn(k) all descrambling accumulated values in are respectively less than preset decision threshold, illustrate 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 sequence Dn(k) exist in more than or equal to preset
The descrambling accumulated value of decision threshold T illustrates that currently employed n value is correct, completes 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 sky packet, it is characterised in that this method comprises the concrete steps that:
Step 1, parameter initialization: setting physical layer scrambling code sequence generators parameter n is 0, frame the number L, L stored needed for being arranged
≤ 4, accumulation length parameter Y is set, and decision threshold T is arranged in Y≤736；
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 extracts payload symbols section from the data frame of channel demodulation output, is denoted as P1,P2,...,PL, each payload symbols
The length M of section is identical, and M is the given data obtained in channel demodulating process, successively stores P1,P2,...,PL, obtain symbol
Sequence S (i), i are the serial number of symbol in symbol sebolic addressing, i=1,2,3 ..., M × L；
N value is placed in physical layer scrambling code sequence generators, and scrambling code sequence generators is resetted by step 4, and generating length is M's
Physical layer scrambler sequence Rn(j), j is the symbol serial number in physical layer scrambler sequence, j=1,2,3 ..., M；By Rn(j) it repeats to deposit
It stores up L times and obtains sequence Qn(i), i=1,2,3 ..., M × L, sequence Qn(i) identical with the length of sequence S (i)；
Step 5 calculates the cumulative sequence D of descrambling as followsn(k):
Wherein abs () function is plural modulus operation, and k is the descrambling accumulated value serial number descrambled in cumulative sequence；
Step 6, to sequence Dn(k) all descrambling accumulated values in are compared with preset decision threshold T one by one, are judged:
If sequence Dn(k) all descrambling accumulated values in are respectively less than preset decision threshold, illustrate that currently used n is incorrect, need
By the value+1 of n, and goes to step 4 and carry out next round calculating；If sequence Dn(k) exist in and be more than or equal to preset decision gate
The descrambling accumulated value for limiting T, illustrates that currently employed n value is correct, completes the search of n value.
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