CN106301530A - A kind of fast physical layer scrambling code parameter searching method based on sky bag - Google Patents

A kind of fast physical layer scrambling code parameter searching method based on sky bag Download PDF

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Publication number
CN106301530A
CN106301530A CN201610710738.6A CN201610710738A CN106301530A CN 106301530 A CN106301530 A CN 106301530A CN 201610710738 A CN201610710738 A CN 201610710738A CN 106301530 A CN106301530 A CN 106301530A
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sequence
physical layer
scrambling code
descrambling
value
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CN106301530B (en
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邢新景
陈烈
胡海龙
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Hangzhou National Chip Science & Technology Co Ltd
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Hangzhou National Chip Science & Technology Co Ltd
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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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Computing Systems (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Radio Relay Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The present invention relates to a kind of fast physical layer scrambling code parameter searching method based on sky bag.Traditional physical layer scrambling code parameter searching method uses supposition heuristic based on channel error correction, the overlong time that the method is attempted every time, causes total search time long.The inventive method first parameter initialization, satellite received signal is carried out channel demodulation, extract successively from the Frame of channel demodulation output and store payload symbols section, the most successively n value is inserted physical layer scrambling code sequence generators, and scrambling code sequence generators is resetted, produce physical layer scrambler sequence, calculate the cumulative sequence of descrambling, finally all descrambling accumulated values in sequence cumulative to descrambling compare with default decision threshold T one by one, judge.The inventive method is utilized can quickly to search for physical layer scrambling code parameter, within search time can be reduced to 100 seconds.

Description

A kind of fast physical layer scrambling code parameter searching method based on sky bag
Technical field
The invention belongs to Digital TV Receiving technical field, relate to a kind of fast physical layer scrambling code parameter based on sky bag and search Suo Fangfa.
Background technology
DVBS2 standard (European second generation satellite digital TV transmission standard) have employed the technical system by frame transmission, for Sufficiently being disperseed at distributed band alleviating distention in middle-JIAO by transmission energy, the data that transmitting terminal sends are through a series of process and at physics After layer framing, in addition it is also necessary to according to the scrambler sequence that physical layer scrambling generator produces, each transmission symbol in physical frame is carried out Random phase rotates.Physical layer scrambling generator needs parameter n, and the span of n is 0≤n≤262141.By arranging Different n can obtain different scrambler sequence, and under default condition, n sets to 0.If n is set to non-zero value by transmitting terminal, then connect Receipts machine needs from this parameter of line search, otherwise cannot be correct descramble Frame, the most just cannot recover transmitting terminal and send out The data gone out.
Typical DVBS2 DVB is as it is shown in figure 1, satellite-signal sends into the demodulation of channel demodulation module, its output Being the physical layer data frame sequence that have passed through Timed Recovery and carrier phase recovery, this sequence 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 export to subsequent treatment.
The searching method of traditional physical layer scrambling code parameter n uses supposition heuristic based on channel error correction, it is first assumed that 1 Individual n value inserts channel error correction module, and attempts the output of channel demodulation module is carried out error correction, if error correction procedure unsuccessfully illustrates Assuming that n value incorrect, change the next one attempt again.The shortcoming of this method is the overlong time every time attempted, one As hundreds of milliseconds of magnitudes, if 262142 kinds of possible values are all attempted one time, the time of cost is typically several little Time to 1 day time.For the occasion that search time is limited, the method is inapplicable.
Summary of the invention
Present invention aims to the deficiencies in the prior art, it is provided that a kind of fast physical layer scrambler based on sky bag is joined Number searching method.
The step that is embodied as of the present invention is:
Step 1, parameter initialization: arranging physical layer scrambling code sequence generators parameter n is 0, arrange the frame of required storage Number L, L≤4, accumulation length parameter Y, Y≤736 are set, decision threshold T is set；
Step 2, satellite received signal carrying out channel demodulation, 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, from channel demodulation output Frame extract payload symbols section, be denoted as P1,P2,...,PL, each load Length M of sign field is identical, and M is the given data obtained in channel demodulating process, stores P successively1,P2,...,PL, obtain Symbol sebolic addressing S (i), i is the sequence number of symbol in symbol sebolic addressing, i=1,2,3 ..., M × L；
Step 4, n value is inserted physical layer scrambling code sequence generators, and scrambling code sequence generators is resetted, produce a length of Physical layer scrambler sequence R of Mn(j), j is the symbol sequence number in physical layer scrambler sequence, j=1,2,3 ..., M；By RnJ () repeats Store L time and obtain sequence Qn(i), i=1,2,3 ..., M × L, sequence QnI () is identical with the length of sequence S (i)；
Step 5, it is pressed into lower formula and calculates the cumulative sequence D of descramblingn(k):
D n ( k ) = a b s ( Σ j = k k + Y ( S n ( j ) × Q n ( j ) ) ) , k = 1 , 2 , ... , M × L - Y ;
Wherein abs () function is plural number modulus operation, and k is the descrambling accumulated value sequence number in the cumulative sequence of descrambling；
Step 6, to sequence DnK all descrambling accumulated values in () compare with default decision threshold T one by one, make Judge: if sequence DnK all descrambling accumulated values in () are respectively less than the decision threshold preset, currently used n is being described the most just Really, need the value+1 of n, and forward step 4 to and carry out next round calculating；If sequence DnK () middle existence is more than or equal to default The descrambling accumulated value of decision threshold T, illustrates that currently employed n value is correct, completes the search of n value.
The inventive method have employed supposition heuristic based on sky bag, adds parameter n search module in receivers, logical The calculating crossing search module can directly obtain correct n, correct n value is inserted channel error correction module and just can directly produce Output data.The search procedure of parameter n make use of the empty bag (i.e. MPEG2 sky bag) transmitted in DVBS2 satellite communication system, empty Bag is the special bag of a class that DVBS2 satellite communication system transmits, and its main feature is that its payload content is known and is all 0 Or it is all 1.The problem that empty bag is mainly used in solving satellite communication transmitting terminal rate adaptation.The transmission mode of DVBS2 is QPSK The when of pattern, physical layer constellation symbol corresponding to the content of empty bag can flock together and occur continuously, and persistence length is 736 Symbol, utilizes the inventive method can quickly search for physical layer scrambling code parameter, within search time can be reduced to 100 seconds.
Accompanying drawing explanation
Fig. 1 is typical DVB schematic diagram；
Fig. 2 is the DVB schematic diagram employing the inventive method；
Fig. 3 is the schematic flow sheet of the inventive method；
Fig. 4 is load section position view in physical frame；
Fig. 5 is symbol sebolic addressing S (i) and sequence QnThe schematic diagram of (i).
Detailed description of the invention
A kind of fast physical layer scrambling code parameter searching method based on sky bag, as in figure 2 it is shown, add ginseng in receivers Number n search module, can directly obtain correct n by the calculating of search module, correct n value is inserted channel error correction module Just can directly produce output data, the search procedure of parameter n make use of the empty bag transmitted in DVBS2 satellite communication system (i.e. MPEG2 sky bag), empty bag is the bag that a class that DVBS2 satellite communication system transmits is special, and its main feature is that it carries Lotus content is known and is all 0 or is all 1.The problem that empty bag is mainly used in solving satellite communication transmitting terminal rate adaptation.DVBS2 Transmission mode when be QPSK mode, the physical layer constellation symbol that the content of empty bag is corresponding can flock together to go out continuously Existing, persistence length is 736 symbols.
Choose concrete to the present invention of a representational DVBS2 satellite digital television receiving system below in conjunction with the accompanying drawings Embodiment illustrates.
In this embodiment, the symbol energy of channel demodulation output has been normalized to P, is embodied as step such as Fig. 3:
Step 1, parameter initialization: arranging physical layer scrambling code sequence generators parameter n is 0, arrange the frame of required storage Number L=2, arranges accumulation length parameter Y=512, arranges decision threshold
Step 2, satellite received signal carrying out channel demodulation, the output of channel demodulation is to have passed through Timed Recovery and carrier wave Phase recovery physical layer data frame sequence；
Step 3, from channel demodulation output Frame extract payload symbols section, the position of payload symbols section such as Fig. 4 institute Show, be denoted as P respectively1,P2,...,PL, length M of each payload symbols section is identical, and M is to obtain in channel demodulating process Primary data, stores P successively1,P2,...,PL, obtaining symbol sebolic addressing S (i), i is the sequence number of symbol in symbol sebolic addressing, i=1,2, 3 ..., M × L, as shown in Figure 5；
Step 4, n value is inserted physical layer scrambling code sequence generators, and scrambling code sequence generators is resetted, produce a length of Physical layer scrambler sequence R of Mn(j), j is the symbol sequence number in physical layer scrambler sequence, j=1,2,3 ..., M；By RnJ () repeats Store L time and obtain sequence Qn(i), i=1,2,3 ..., M × L, sequence QnI () is identical with the length of sequence S (i), as shown in Figure 5；
Step 5, it is pressed into lower formula and calculates the cumulative sequence D of descramblingn(k):
D n ( k ) = a b s ( Σ j = k k + Y ( S n ( j ) × Q n ( j ) ) ) , k = 1 , 2 , ... , M × L - Y ;
Wherein abs () function is plural number modulus operation, and k is the descrambling accumulated value sequence number in the cumulative sequence of descrambling；
Step 6, to sequence DnK all descrambling accumulated values in () compare with default decision threshold T one by one, make Judge: if sequence DnK all descrambling accumulated values in () are respectively less than the decision threshold preset, currently used n is being described the most just Really, need the value+1 of n, and forward step 4 to and carry out next round calculating；If sequence DnK () middle existence is more than or equal to default 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 rather than limitation of the present invention, any do not surpass Go out the innovation and creation in the range of true spirit, within each falling within protection scope of the present invention.

Claims (1)

1. a fast physical layer scrambling code parameter searching method based on sky bag, it is characterised in that the method comprises the concrete steps that:
Step 1, parameter initialization: arranging physical layer scrambling code sequence generators parameter n is 0, arrange frame number L of required storage, L ≤ 4, accumulation length parameter Y, Y≤736 are set, decision threshold T is set；
Step 2, satellite received signal carrying out channel demodulation, the output of channel demodulation is to have passed through Timed Recovery and carrier phase The physical layer data frame sequence recovered；
Step 3, from channel demodulation output Frame extract payload symbols section, be denoted as P1,P2,...,PL, each payload symbols Length M of section is identical, and M is the given data obtained in channel demodulating process, stores P successively1,P2,...,PL, obtain symbol Sequence S (i), i is the sequence number of symbol in symbol sebolic addressing, i=1,2,3 ..., M × L；
Step 4, n value is inserted physical layer scrambling code sequence generators, and scrambling code sequence generators is resetted, produce a length of M's Physical layer scrambler sequence Rn(j), j is the symbol sequence number in physical layer scrambler sequence, j=1,2,3 ..., M；By RnJ () repeats to deposit Store up L time and obtain sequence Qn(i), i=1,2,3 ..., M × L, sequence QnI () is identical with the length of sequence S (i)；
Step 5, it is pressed into lower formula and calculates the cumulative sequence D of descramblingn(k):
D n ( k ) = a b s ( Σ j = k k + Y ( S n ( j ) × Q n ( j ) ) ) , k = 1 , 2 , ... , M × L - Y ;
Wherein abs () function is plural number modulus operation, and k is the descrambling accumulated value sequence number in the cumulative sequence of descrambling；
Step 6, to sequence DnK all descrambling accumulated values in () compare with default decision threshold T one by one, judge: If sequence DnK all descrambling accumulated values in () are respectively less than the decision threshold preset, illustrate that currently used n is incorrect, need By the value+1 of n, and to forward step 4 to and carry out next round calculating；If sequence DnK () exists more than or equal to the decision gate preset The descrambling accumulated value of limit T, illustrates that currently employed n value is correct, completes the search of n value.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109428678A (en) * 2017-09-04 2019-03-05 扬智科技股份有限公司 Physical layer frame scrambling code parameter searching method and circuit

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US8539308B2 (en) * 2007-04-20 2013-09-17 Interdigital Technology Corporation Method and apparatus for indicating a temporary block flow to which a piggybacked ACK/NACK field is addressed
CN103560863A (en) * 2013-10-31 2014-02-05 电子科技大学 Method for identifying pseudorandom scrambling codes
US20140161209A1 (en) * 2009-12-31 2014-06-12 Allen LeRoy Limberg COFDM broadcasting with single-time retransmission of COFDM symbols
CN105530072A (en) * 2014-09-29 2016-04-27 普天信息技术有限公司 Uplink signal decoding method based on code block segmentation and base station

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US8539308B2 (en) * 2007-04-20 2013-09-17 Interdigital Technology Corporation Method and apparatus for indicating a temporary block flow to which a piggybacked ACK/NACK field is addressed
US20130326320A1 (en) * 2007-04-20 2013-12-05 Interdigital Technology Corporation Method and apparatus for indicating a temporary block flow to which a piggybacked ack/nack field is addressed
CN101562502A (en) * 2009-06-04 2009-10-21 清华大学 Physical-layer sub-channel allocation method, emission system and receiving system
US20140161209A1 (en) * 2009-12-31 2014-06-12 Allen LeRoy Limberg COFDM broadcasting with single-time retransmission of COFDM symbols
CN102158446A (en) * 2010-02-11 2011-08-17 中兴通讯股份有限公司 Method and device for decoding physical broadcast channel (PBCH) in time division duplex (TDD) system
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CN105530072A (en) * 2014-09-29 2016-04-27 普天信息技术有限公司 Uplink signal decoding method based on code block segmentation and base station

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109428678A (en) * 2017-09-04 2019-03-05 扬智科技股份有限公司 Physical layer frame scrambling code parameter searching method and circuit
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

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