CN109428678A - Physical layer frame scrambling code parameter searching method and circuit - Google Patents
Physical layer frame scrambling code parameter searching method and circuit Download PDFInfo
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- CN109428678A CN109428678A CN201710785302.8A CN201710785302A CN109428678A CN 109428678 A CN109428678 A CN 109428678A CN 201710785302 A CN201710785302 A CN 201710785302A CN 109428678 A CN109428678 A CN 109428678A
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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
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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
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
- H04L25/03866—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using scrambling
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- 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
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- Spectroscopy & Molecular Physics (AREA)
- Power Engineering (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
This disclosure relates to physical layer frame scrambling code parameter searching method and circuit.The embodiment of the present invention provides the physical layer frame scrambling code parameter searching method and circuit under a kind of system suitable for DVB-S2.Described search method will can utilize the physical layer frame scrambling code parameter in a transmitter of the bit section known in base band frame to find out this DVB-S2 system, to considerably increase the practicability of searching method.In addition to this, described search method can also be properly joined into the mechanism of release of an interleave and/or base band descrambling, with more can be effective for current substandard all situations.
Description
Technical field
The present invention relates to one kind to be suitable for second generation digital video broadcast-satellite (Digital Video
Broadcasting-Satellite-Second Generation, DVB-S2) physical layer frame scrambling code parameter search under system
Method and circuit, and more particularly to one kind this can be found out using bit section known in base band (Baseband, BB) frame
The searching method and circuit of physical layer frame scrambling code parameter in one transmitter of DVB-S2 system.
Background technique
In general, physical layer frame transmitted by the transmitter of DVB-S2 system (physical layer frame) is every
One symbol all can be randomization upset processing to be carried out via a scrambler sequence, and the scrambler sequence is then by an x sequence
With combined type sequence composed by a y sequence.Wherein y sequence is constant to be kept fixed, but x sequence is disturbed by a physical layer frame
Code parameter n determines its displacement, and the value range of n is 0 to 262141.In other words, it can be produced by the way that different n values is arranged
Raw different scrambler sequence, and different upset processing is executed in turn.Therefore, receiver needs to know n used in transmitter
Value, otherwise will be unable to correctly descramble the physical layer frame received, also can not just recover original physical layer frame.
However, there is no the clear signaling methods for n value being sent to receiver at present, therefore receiver must derive from row and search
Rope goes out the n value.In existing physical layer frame scrambling code parameter searching method, receiver is then by utilizing pilot signal mostly
Symbol known to empty packet of (pilot signal), virtual frames (dummy frame) or QPSK etc., comes successively from 262142 kinds
It is attempted in possible value, and until finding out most correct n value.But the shortcomings that this method, is, if working as DVB-
One transmitter of S2 system be using no pilot signal, without virtual frames or even more high-order modulation system (for example,
When 32APSK), this method cannot be applicable in.Therefore, it is necessary to the new physical layer frames under a kind of system suitable for DVB-S2 to disturb
Code parameter searching method and circuit.
Summary of the invention
In view of this, the embodiment of the present invention provides the physical layer frame scrambling code parameter search under a kind of system suitable for DVB-S2
Method and circuit, and more particularly to a kind of the one of the DVB-S2 system can be found out using bit section known in base band frame
The searching method and circuit of physical layer frame scrambling code parameter in transmitter.
The embodiment of the present invention provides a kind of physical layer frame scrambling code parameter searching method.The physical layer frame scrambling code parameter search
The step of method, is as follows.Firstly, receiving the satellite-signal that the transmitter from DVB-S2 system is transmitted, and to this satellite
Signal carries out channel demodulation, to produce physical layer frame.Secondly, successively using one in multiple default scrambling code parameters to this
Physical layer frame is descrambled, and multiple symbols are extracted from the physical layer frame after descrambling.Then, these symbols are sentenced firmly
Certainly (hard decision), to acquire these each default corresponding one first bit sections of scrambling code parameter.Finally, according to this
A little first bit sections and one second bit section select the one of as the physics in this transmitter of these default scrambling code parameters
Layer frame scrambling code parameter.
The embodiment of the present invention separately provides a kind of physical layer frame scrambling code parameter search circuit.The physical layer frame scrambling code parameter is searched
Rope circuit includes a reception and demodulation module, a processing module and a selection module.Reception and demodulation module, come to receive
The satellite-signal that one transmitter of DVB-S2 system is transmitted, and channel demodulation is carried out to this satellite-signal, to produce object
Manage layer frame.Processing module then successively descrambles this physical layer frame using one in multiple default scrambling code parameters, and
It extracts multiple symbols from the physical layer frame after descrambling, and hard decision is carried out to these symbols, each these are pre- to acquire
If corresponding one first bit section of scrambling code parameter.Module is chosen then according to these first bit sections and one second bit section, selection
One of them of these default scrambling code parameters is as the physical layer frame scrambling code parameter in this transmitter.
Be further understood that feature and technology contents of the invention to be enabled, please refer to below in connection with it is of the invention specifically
Bright and attached drawing, but these explanations are intended merely to illustrate the present invention with Detailed description of the invention book attached drawing, rather than to right model of the invention
It encloses and makees any limitation.
Detailed description of the invention
Fig. 1 is the flow diagram of physical layer frame scrambling code parameter searching method provided by the embodiment of the present invention.
Fig. 2A is the schematic diagram in relation to the base band scrambler sequence in DVB-S2 system.
Fig. 2 B be in relation to the base band scrambler sequence through Fig. 2A upset the frame structure signal of treated base band frame
Figure.
Fig. 3 A is process of the step S120 under a preferred embodiment in the physical layer frame scrambling code parameter searching method of Fig. 1
Schematic diagram.
Fig. 3 B is stream of the step S120 under another preferred embodiment in the physical layer frame scrambling code parameter searching method of Fig. 1
Journey schematic diagram.
Fig. 3 C is stream of the step S120 under another preferred embodiment in the physical layer frame scrambling code parameter searching method of Fig. 1
Journey schematic diagram.
Fig. 4 is process of the step S130 under a preferred embodiment in the physical layer frame scrambling code parameter searching method of Fig. 1
Schematic diagram.
Fig. 5 is stream of the step S130 under another preferred embodiment in the physical layer frame scrambling code parameter searching method of Fig. 1
Journey schematic diagram.
Fig. 6 is the functional block diagram of physical layer frame scrambling code parameter search circuit provided by the embodiment of the present invention.
Specific embodiment
Hereinafter, it will illustrate that the present invention various embodiments carry out the present invention is described in detail by schema.However, of the invention
Concept may embody in many different forms, and should not be construed as limited by exemplary embodiments set forth herein.In addition,
Same reference numbers can be used to indicate similar component in the drawings.
Referring to Fig. 1, Fig. 1 is the process signal of physical layer frame scrambling code parameter searching method provided by the embodiment of the present invention
Figure.Firstly, in the step s 100, receiving the satellite-signal that the transmitter from DVB-S2 system is transmitted, and defend to this
Star signal carries out channel demodulation, to produce physical layer frame.Secondly, in step s 110, successively utilizing multiple default scrambling codes
One in parameter descrambles this physical layer frame, and extracts multiple symbols from the physical layer frame after descrambling.Then, exist
In step S120, hard decision is carried out to these symbols, to acquire these each default corresponding one first bits of scrambling code parameter
Section.Finally, in step s 130, according to these first bit sections and second bit section, selecting these default scrambling code parameters
It is one of as the physical layer frame scrambling code parameter in this transmitter.
It carefully says, physical layer frame scrambling code parameter searching method, can be adapted for DVB- provided by the embodiment of the present invention
In any one receiver under S2 system.But the present invention is not intended to limit the specific implementation of receiver or transmitter, therefore
The usually intellectual of having should can be designed according to actual demand or application in the art.In addition, it is to be understood that
Step S100 channel demodulation is carried out to the satellite-signal that receives, be just intended to produce have passed through Timed Recovery and
The physical layer frame of carrier phase recovery.Since the operation principles of channel demodulation are practised by the usually intellectual of having in the art
Know, therefore is dissolved in this in the thin portion in relation to step S100 and just no longer adds to repeat.
Following explanation for convenience, the present invention can first assume that these default scrambling code parameters of step S110 are defined as def_n
(1)~def_n (L), wherein L be more than or equal to 2 and be less than or equal to 262142 any positive integer, and each default scrambling code parameter
Def_n (1)~def_n (L) value is then the integer between 0 to 262141.For example, if the present embodiment is will
When 262142 kinds of possible values all attempt one time, the L of above-mentioned example is 262142, and default scrambling code parameter def_n (1)
Value may be, for example, 0, preset scrambling code parameter def_n (2) value may be, for example, 1, and so on, preset scrambling code parameter def_
The value of n (262142) is then 262141.
Similarly, there are 3 kinds of possible values (for example, n value is 28,54 or 108) if the present embodiment can tentatively have been known
When needing to attempt, the L of above-mentioned example is 3, and the value of default scrambling code parameter def_n (1) may be, for example, 28, presets scrambling code ginseng
The value of number def_n (2) is 54, and the value for presetting scrambling code parameter def_n (3) is then 108.To sum up, above-mentioned, these are pre-
If scrambling code parameter def_n (1)~def_n (L) specific implementation is also merely citing herein, not to limit this hair
It is bright.
In addition, it is to be understood that can be seen as being transmitter for via generated physical layer frame after step S100
The generated physical layer frame after using the upset of n value processing.However, since the present embodiment fails to know in advance used in transmitter
N value, so the present embodiment can be utilized respectively each default scrambling code parameter def_n (1)~def_n (L) to come to step S100
Physical layer frame descrambled.Following explanation for convenience, the present invention also can first assume to utilize default scrambling code parameter def_n (i)
Physical layer frame after being descrambled is indicating to be defined as PLF (i), and wherein i is 1 to L any positive integer.
Also, it is to be understood that the present embodiment can be reattempted from the physical layer in step S110 into step S120
Multiple symbols are extracted in frame PLF (i), and hard decision is carried out to these symbols in the physical layer frame PLF (i), to obtain
The first bit section Bs (i) of scrambling code parameter def_n (i) should mutually be preset.Since the operation principles of hard decision are the art
Known by middle tool usually intellectual, therefore this is dissolved in its related thin portion and just no longer adds to repeat.Finally, according to these first
Bit section Bs (1)~Bs (L) and second bit section, the present embodiment just can select these default scrambling code parameter def_n (1)
One in~def_n (L) is as the physical layer frame scrambling code parameter in this transmitter.This is that is, find out this transmitter
Used n value.
It more specifically, must include a base band frame in the physical layer frame that transmitter is sent out.Also referring to arriving
Fig. 2A and Fig. 2 B, Fig. 2A and Fig. 2 B will be used to explain the base band frame of DVB-S2 system.As shown in Figure 2 A, original base band frame can be
After needing to carry out upset processing (also that is, through base band scrambling code) via a base band scrambler sequence, it can just be combined into turn such as Fig. 2 B
Shown in base band frame BBFRAME.Wherein, then and mainly three parts can be subdivided into for the base band frame BBFRAME of Fig. 2 B: first 80
Bit is base band header (BBHEADER), and centre is data field (DATAFIELD), is finally then patch (PADDING).However,
It is thin in relation to it as the frame structure principle of base band frame BBFRAME to have known by usually intellectual in the art
This is dissolved in portion just no longer to add to repeat.
It should be noted that in broadcasted application, since the partial bit section in base band header may be then known.
Therefore the present invention can be using bit section known in the base band header as the foundation for searching out the n value.Above-mentioned base band
Known bit section may be, for example, user's packet length (User Packet Length, UPL) or synchronous package sync in header
Part, and UPL metric length be 188*8=1504, and sync hexadecimal length be 47.In addition to base band mark
It is had in head outside known bit section, the data field of base band frame BBFRAME may also be with the presence of known bits section.With the number of Fig. 2 B
According to may also be had for partial bit section is known empty packet in domain, and so-called " sky packet " is exactly to refer to data field inner part ratio
The particular bit section of the content of special section all 0 or all 1.Therefore the present invention is also using known in the data field
Sky packet is as the foundation for searching out the n value.If the kilo byte that another symbol judgement comes out may only some be
Know, need to only compare known bit when comparing in this way.
Then, teaching according to the above has usually intellectual it would be appreciated that arriving, in step in the art
In S110 these symbols for being extracted from the physical layer frame PLF (i), that is, may be, for example, the corresponding physical layer frame PLF (i)
In base band frame base band header in a known bit section multiple symbols, or be that these symbols also may be, for example,
Multiple symbols of a known empty packet in the data field of the base band frame in the corresponding physical layer frame PLF (i).To sum up,
The present invention is not intended to limit the specific implementation that these symbols are extracted from the physical layer frame PLF (i), in the art
Tool usually intellectual should can carry out relevant design according to actual demand or application.
When from these symbols extracted in the physical layer frame PLF (i) be in the corresponding base band header it is known
When multiple symbols of bit section, second bit section of the embodiment of the present invention can be, for example, known in the base band header is somebody's turn to do
Bit section, and if in subsequent step S130, when the physical layer frame PLF (i) these symbols after hard decision
First bit section Bs (i) then can mutually be equal to bit section (also that is, second bit section) known in the base band header again when,
The present embodiment just can confirm that out that default scrambling code parameter def_n (i) corresponding to the first bit section Bs (i) is exactly this transmitter institute
N value (also that is, physical layer frame scrambling code parameter) in this transmitter.
Similarly, when these symbols extracted from the physical layer frame PLF (i) are to have corresponded to the interior institute of the data field
When the multiple symbols for the empty packet known, second bit section of the embodiment of the present invention can be, for example, all 0 or all 1 special ratio
Special section, and if in subsequent step S130, when the physical layer frame PLF (i) these symbols after hard decision
When one bit section Bs (i) then can mutually be equal to the particular bit section again, the present embodiment just also can confirm that out first bit section Bs
(i) the default scrambling code parameter def_n (i) corresponding to is exactly n value used in this transmitter.Detailed selection mechanism is (also that is, step
S130), more subsequent paragraph will be described in.
On the other hand, as shown in Figure 2 A, because the initial value perseverance of base band scrambler sequence be kept fixed it is constant (also that is,
100101010000000), so when having known bit section in original base band frame, the known bit section institute is through base
It also can be just then known (also that is, bit section known in the base band header) with the bit section generated after scrambling code.Therefore,
It should be understood that when these symbols extracted from the physical layer frame PLF (i) are to have corresponded to the interior institute of the base band header
When the multiple symbols for the bit section known, second bit section of the embodiment of the present invention just also may be, for example, that institute has been in the base band header
The bit section known and not via the original bit section before base band scrambling code.
In other words, it is above-mentioned it is such in special circumstances, the present invention is also being changed to using the original bit Duan Laizuo
For the foundation for searching out the n value.However, due to the first bit section Bs (1)~Bs (L) caused by after hard decision still fall within through
Base band scrambling code treated bit result.Therefore, also referring to Fig. 3 A is arrived, Fig. 3 A is that the physical layer frame scrambling code parameter of Fig. 1 is searched
Flow diagram of the step S120 under a preferred embodiment in Suo Fangfa.Wherein, part process identical with Fig. 1 in Fig. 3 A
Step is indicated with identical figure number, therefore no longer adds that its details is described in detail in this.
As described in previous contents, since the embodiment of Fig. 3 A is changed to using the original bit section as search
The foundation of the n value out, therefore, the step S120 of step S120, Fig. 3 A compared to Fig. 1 also may include step S320 and step
S322.Firstly, in step s 320, the present embodiment can carry out hard decision to these symbols.Then, in step S322, this
Embodiment is then to carry out a base band descrambling to these symbols after hard decision again, corresponding to acquire each default scrambling code parameter
The first bit section.Similarly it is found that if in subsequent step S130, when these symbols of the physical layer frame PLF (i) are passed through
When the first bit section Bs (i) after hard decision and base band descrambling then can mutually be equal to the original bit section again, the present embodiment just can
Confirm that default scrambling code parameter def_n (i) corresponding to the first bit section Bs (i) is exactly n value used in this transmitter.
On the other hand, it is specified that 4 kinds of modulation systems in the formulation standard of DVB-S2 system: QPSK, 8PSK, 16APSK
And 32APSK, and when this transmitter is using other modulation systems other than QPSK, what this transmitter to be transmitted
Data information via image and before being packaged into physical layer frame, all can be need by one staggeredly (Interleave) processing.
However, since staggered operation principles are to have known by usually intellectual in the art, its related thin portion content
Just no longer add to repeat in this.
Then, also referring to Fig. 3 B is arrived, Fig. 3 B is the step S120 in the physical layer frame scrambling code parameter searching method of Fig. 1
Flow diagram under another preferred embodiment.Wherein, in Fig. 3 B identical with Fig. 1 or Fig. 3 A process step in part with identical
Figure number mark, therefore no longer add that its details is described in detail in this.It should be noted that since the embodiment of Fig. 3 B allows for this hair
Send machine modulation system be using 8PSK, 16APSK or 32APSK in the case where, but the embodiment of Fig. 3 B then be still using should
Known bit section in base band header, or using empty packet known in the data field as search out the n value according to
According to when, therefore, the step S120 of step S120, Fig. 3 B compared to Fig. 1 also may include step S320 and step S324.
In step S324, the present embodiment is then to carry out a release of an interleave (De- to these symbols after hard decision again
Interleave), to acquire corresponding first bit section of each default scrambling code parameter.Similarly it is found that if in subsequent step
In rapid S130, when the physical layer frame PLF (i) these symbols the first bit section Bs (i) after hard decision and release of an interleave then
When can mutually be equal to second bit section again, the present embodiment just can confirm that out default corresponding to the first bit section Bs (i) disturb
Code parameter def_n (i) is exactly n value used in this transmitter.Since the operation principles of release of an interleave are also to have in the art
Known by usual skill, therefore this is dissolved in its related thin portion and just no longer adds to repeat.
To sum up, the present invention is not intended to limit ought acquire each default scrambling code parameter correspondence after executing hard decision
The first bit section specific implementation, in the art the usually intellectual of having should can according to actual demand or application come
Carry out relevant design.Therefore, if the modulation system for working as this transmitter uses in the case where being 8PSK, 16APSK or 32APSK,
And the present embodiment be instead again then using aforementioned original bit section as the foundation for searching out the n value when, also referring to arriving
Fig. 3 C.Wherein, the step S120 of Fig. 3 C then may include step S320 and step S326~step S328.It should be noted that by
In the integration application that the step process of Fig. 3 C is previous embodiment, and release of an interleave performed by receiver and base band descrambling is preferential
Sequentially (also that is, step S326 and step S328) also to have known by usually intellectual in the art, therefore related figure
This is dissolved in the thin portion of 3C just no longer to add to repeat.Teaching according to the above, has usually intellectual in the art
It would be appreciated that arriving, the physical layer frame scrambling code parameter searching method of the embodiment of the present invention, can be entirely different from existing skill
Art means, but the physical layer frame scrambling code parameter in this transmitter can be found out using bit section known in base band frame, with
Considerably increase the practicability of this searching method.
Then, below in order to further explain the realization details about step S130, the present invention further provides its steps
A kind of embodiment of rapid S130.Referring to Fig. 4, Fig. 4 is the step S130 in the physical layer frame scrambling code parameter searching method of Fig. 1
Flow diagram under a preferred embodiment.It is worth noting that, the embodiment of following uses be only herein to illustrate,
It is not intended to limiting the invention.In addition, part process step identical with Fig. 1 is indicated in Fig. 4 with identical figure number, therefore in this
No longer add that its details is described in detail.
As shown in figure 4, step S130, which may also include, step S400 and step S410.Firstly, in step S400, this reality
Applying regular meeting is the bit error rate checked between the first bit section of each default scrambling code parameter and second bit section in order
Whether (bit error rate, BER) is lower than a predetermined threshold value, and is lower than predetermined threshold value when finding the bit error rate
When, then carry out step S410.In step S410, the present embodiment then selects default scrambling code parameter corresponding to the bit error rate
As the physical layer frame scrambling code parameter in this transmitter, that is to say, that find out n value used in this transmitter.Due to related
The technical principle of bit error rate is to have known by usually intellectual in the art, therefore be dissolved in this just not in its thin portion
Add to repeat again.
To sum up, teaching according to the above, has usually intellectual it would be appreciated that arriving, figure in the art
The technical way of 4 methods is in that, in order by corresponding first bit section of each default scrambling code parameter come with it is known
Bit section (also that is, second bit section) is compared, and whereby by the first bit section for meeting a preset condition that can most take the lead in
Default scrambling code parameter is selected as most correct n value.
In addition, referring to Fig. 5, Fig. 5 be step S130 in the physical layer frame scrambling code parameter searching method of Fig. 1 in it is another compared with
Flow diagram under good embodiment.It is worth noting that, the embodiment of following uses is also only to illustrate, simultaneously herein
It is non-to limit the present invention.Wherein, part process step identical with Fig. 1 is indicated in Fig. 5 with identical figure number, therefore no longer in this
Add that its details is described in detail.
As shown in figure 5, step S130, which may also include, step S500 and step S510.Firstly, in step S500, this reality
Apply the bit error rate between the first bit section and second bit section that regular meeting is more each default scrambling code parameter.Then, exist
In step S510, the present embodiment then select the minimum in these bit error rates one corresponding to default scrambling code parameter as this
Physical layer frame scrambling code parameter in transmitter.
Similarly, compared to the technological means of Fig. 4 method, the technical way of Fig. 5 method is then obviously, first will be complete
First bit section in portion is compared with known bit section (also that is, second bit section), and find out whereby most can be equal
The default scrambling code parameter for meeting the first bit section of second bit section is used as most correct n value.To sum up, the present invention is not
Limitation the specific implementation of n value is found out using bit error rate, have usually intellectual Ying Keyi in the art
Relevant design is carried out according to actual demand or application.
In addition, it is to be understood that receiver of the invention can also be by low-density parity inspection (Low-
Density parity-check, LDPC) the decoding result of code and BCH (Bose Chaudhuri Hocquengham) code comes pair
The n value is verified, the correctness of this searching method is substantially improved.Since LDPC code and the operation principles of BCH code are this skill
Have known by usually intellectual in art field, therefore is dissolved in this in its related thin portion and just no longer adds to repeat.
Subsidiary one is mentioned that, as described in previous contents, since the content (also that is, first bit section) of sky packet can be entirely
Portion is 0 or all 1, therefore the second bit section for being used to compare in the present embodiment just may require that correspond to and use all 0
Or all 1 particular bit section.In view of this, the embodiment of the present invention can also be compared in first and second bit section
Before, dibit adjacent in the first bit section is first just done into exclusive or.Because the result after exclusive or all can be 0, thus
Without knowing that the first bit section is that all 0 or all 1 sky wraps, and the second bit section then more only needs to use whole
For 0 particular bit section.
On the other hand, in order to further explain the operation workflow about the above method, the present invention further provides implementations
The circuit of above-mentioned physical layer frame scrambling code parameter search.Referring to Fig. 6, Fig. 6 is that physical layer frame provided by the embodiment of the present invention is disturbed
The functional block diagram of code parameter search circuit.However, following physical layer frame scrambling code parameter search circuits 6 is only the above method
One of implementation, it is not intended to limiting the invention.In addition, the physical layer frame scrambling code parameter search circuit 6 can
With any one receiver under DVB-S2 system, but the present invention is not intended to limit the specific implementation of receiver,
The usually intellectual of having should can be designed according to actual demand or application in the art.
The physical layer frame scrambling code parameter search circuit 6 may include a reception and demodulation module 61, a processing module 63
And one choose module 65.Wherein, above-mentioned each module, which can be through pure hardware circuit, realizes, or takes through hardware circuit
It is realized with firmware or software, to sum up, the present invention is not intended to limit the specific implementation of physical layer frame scrambling code parameter search circuit 6
Mode.In addition, above-mentioned each module can be integration or be provided separately, and the present invention is also not limited system.
It more carefully says, receives and (be not painted) institute to receive the transmitter from DVB-S2 system with demodulation module 61
The satellite-signal (not being painted) of transmission, and channel demodulation is carried out to this satellite-signal, to produce physical layer frame PLF.Processing
Module 63 then successively descrambles this physical layer frame PLF using one in multiple default scrambling code parameters (not being painted), and
And multiple symbols are extracted from the physical layer frame after descrambling, and hard decision is carried out to these symbols, it is each default to acquire
The corresponding first bit section Bs (1) of scrambling code parameter~Bs (L).Module 65 is chosen then according to these first bit sections Bs (1)~Bs
(L) with second bit section (not being painted), select one in these default scrambling code parameters as the physics in this transmitter
Layer frame scrambling code parameter n.Wherein, detailed process is as described in the previous embodiment, therefore is dissolved in this in its related thin portion and just no longer adds to go to live in the household of one's in-laws on getting married
It states.
It should be noted that if when the modulation system in view of transmitter is using 8PSK, 16APSK or 32APSK
When, processing module 63 may also include a de-interlacing module 631.De-interlacing module 631 is used to these symbols after hard decision
Release of an interleave is carried out, to acquire the corresponding first bit section Bs (1) of each default scrambling code parameter~Bs (L).Or be, when examining
Consider the present invention be using the bit section known in the base band header and not via the original bit section before base band scrambling code come
When as the foundation for searching out the n value, processing module 63 may also include a base band descrambling module 633.Base band descrambling module 633 is then
For carrying out base band descrambling to these symbols after hard decision, to acquire the first ratio corresponding to each default scrambling code parameter
Special section Bs (1)~Bs (L).
It acquires after hard decision each preset to sum up, the present invention is not intended to limit processing module 63 and disturbs executing
The specific implementation of corresponding first bit section Bs (the 1)~Bs (L) of code parameter, the usually intellectual of having answers in the art
Relevant design can be carried out according to actual demand or application.In other words, if being when the modulation system of this transmitter uses
In the case where 8PSK, 16APSK or 32APSK, and the present embodiment is using aforementioned original bit section again as searching out the n value
Foundation when, it is to execute such as Fig. 3 C respectively that de-interlacing module 631 and base band descrambling module 633 in processing module 63, which will change,
Step S326 and step S328.Wherein, detailed process is as described in the previous embodiment, therefore it is just no longer more to be dissolved in this in its related thin portion
Add and repeats.
In conclusion physical layer frame scrambling code parameter searching method and circuit provided by the embodiment of the present invention, it can be complete
It is to be different from existing technological means, but the physics in this transmitter can be found out using bit section known in base band frame
Layer frame scrambling code parameter, to considerably increase the practicability of this searching method.In addition to this, when in view of transmitter be using compared with
When the modulation system of high-order or aforementioned known bit section be then the base band frame not via the original bit before base band scrambling code
Duan Shi, the physical layer frame scrambling code parameter searching method and circuit of the embodiment of the present invention, can also be properly joined into release of an interleave and/or base
Mechanism with descrambling, with more can be effective for current substandard all situations.
The above, the only preferred embodiments of the disclosure, only feature of the invention is not limited thereto, this
The technical staff in field within the field of the present invention, can think easily and changes or modifications, can all cover in the claims
In.
Claims (14)
1. a kind of physical layer frame scrambling code parameter searching method, which is characterized in that the physical layer frame scrambling code parameter searching method includes:
The satellite-signal that the transmitter from a second generation digital video broadcast-satellite system is transmitted is received, and to this
Satellite-signal carries out channel demodulation, to produce a physical layer frame；
Successively the physical layer frame is descrambled using one in multiple default scrambling code parameters, and from the object after descrambling
Multiple symbols are extracted in reason layer frame；
Hard decision is carried out to multiple symbol, to acquire corresponding one first bit section of each multiple default scrambling code parameter；
And
According to multiple first bit sections and one second bit section, the one of as the hair of multiple default scrambling code parameter is selected
Send the physical layer frame scrambling code parameter in machine.
2. physical layer frame scrambling code parameter searching method as described in claim 1, which is characterized in that wherein multiple symbol is pair
The multiple symbols or multiple symbol of a bit section that should be known in a base band header of a base band frame in physical layer frame
Number for an empty packet known in a data field of the base band frame in the corresponding physical layer frame multiple symbols.
3. physical layer frame scrambling code parameter searching method as described in claim 1, which is characterized in that wherein when the tune of the transmitter
When mode processed is adopted as 8PSK, 16APSK or 32APSK, carrying out the hard decision to multiple symbol, to acquire, each this is more
In the step of a default scrambling code parameter corresponding first bit section, further includes:
The hard decision is carried out to multiple symbol, and a release of an interleave is carried out to multiple symbol after the hard decision, to obtain
Obtain corresponding first bit section of each multiple default scrambling code parameter.
4. physical layer frame scrambling code parameter searching method as claimed in claim 2, which is characterized in that wherein when multiple symbol is
In the base band header of the corresponding base band frame when multiple symbols of the known bit section, which is the base band mark
Bit section known in the known bit section or the base band header in head and it is not former via one before a base band scrambling code
Beginning bit section, wherein when multiple symbols of sky packet known in the data field that multiple symbol is the corresponding base band frame
When, which is then an all 0 or all 1 particular bit section.
5. physical layer frame scrambling code parameter searching method as claimed in claim 4, which is characterized in that wherein when second bit section
When for the bit section known in the base band header not via the original bit section before the base band scrambling code, to multiple
In the step of symbol carries out the hard decision to acquire each multiple default scrambling code parameter corresponding first bit section, also wrap
It includes:
The hard decision is carried out to multiple symbol, and a base band descrambling is carried out to multiple symbol after the hard decision, with
Acquire corresponding first bit section of each multiple default scrambling code parameter.
6. physical layer frame scrambling code parameter searching method as described in claim 1, which is characterized in that wherein according to multiple
One bit section and second bit section select the one of as the physics in the transmitter of multiple default scrambling code parameter
In the step of layer frame scrambling code parameter, further includes:
Check that the bit between first bit section and second bit section of each multiple default scrambling code parameter is wrong in order
Accidentally whether rate is lower than a predetermined threshold value, and when finding the bit error rate lower than the predetermined threshold value, then selects the ratio
The default scrambling code parameter is as the physical layer frame scrambling code parameter in the transmitter corresponding to special error rate.
7. physical layer frame scrambling code parameter searching method as described in claim 1, which is characterized in that wherein according to multiple
One bit section and second bit section select the one of as the physics in the transmitter of multiple default scrambling code parameter
In the step of layer frame scrambling code parameter, further includes:
A bit error rate between first bit section and second bit section of more each multiple default scrambling code parameter, and
And select the default scrambling code parameter corresponding to minimum one in multiple bit error rates as the object in the transmitter
Manage layer frame scrambling code parameter.
8. a kind of physical layer frame scrambling code parameter search circuit, which is characterized in that the physical layer frame scrambling code parameter search circuit includes:
One reception and demodulation module, are transmitted to receive the transmitter from a second generation digital video broadcast-satellite system
A satellite-signal, and to the satellite-signal carry out channel demodulation, to produce a physical layer frame；
One processing module successively descrambles the physical layer frame using one in multiple default scrambling code parameters, and from
It extracts multiple symbols in the physical layer frame after descrambling, and hard decision is carried out to multiple symbol, each this is more to acquire
Corresponding one first bit section of a default scrambling code parameter；And
One chooses module, to select multiple default scrambling code parameter according to multiple first bit sections and one second bit section
One of them is as the physical layer frame scrambling code parameter in the transmitter.
9. physical layer frame scrambling code parameter search circuit as claimed in claim 8, which is characterized in that wherein multiple symbol is pair
The multiple symbols or multiple symbol of a bit section that should be known in a base band header of a base band frame in physical layer frame
Number for an empty packet known in a data field of the base band frame in the corresponding physical layer frame multiple symbols.
10. physical layer frame scrambling code parameter search circuit as claimed in claim 8, which is characterized in that wherein when the transmitter
When modulation system is adopted as 8PSK, 16APSK or 32APSK, in the processing module further include:
One de-interlacing module, to carry out a release of an interleave to multiple symbol after the hard decision, to acquire, each this is more
Corresponding first bit section of a default scrambling code parameter.
11. physical layer frame scrambling code parameter search circuit as claimed in claim 9, which is characterized in that wherein when multiple symbol
In the base band header for the corresponding base band frame when multiple symbols of the known bit section, which is the base band
In header in the known bit section or the base band header the known bit section and not via one before a base band scrambling code
Original bit section, wherein when multiple symbols of sky packet known in the data field that multiple symbol is the corresponding base band frame
When, which is then an all 0 or all 1 particular bit section.
12. physical layer frame scrambling code parameter search circuit as claimed in claim 11, which is characterized in that wherein when second bit
Section be the bit section known in the base band header and when not via the original bit section before the base band scrambling code, the processing mould
In block further include:
One base band descrambling module, it is each to acquire to carry out a base band descrambling to multiple symbol after the hard decision
Corresponding first bit section of multiple default scrambling code parameter.
13. physical layer frame scrambling code parameter search circuit as claimed in claim 8, which is characterized in that wherein the selection module is held
Row following steps are according to multiple first bit section and second bit section, to select wherein the one of multiple default scrambling code parameter
A physical layer frame scrambling code parameter as in the transmitter:
Check that the bit between first bit section and second bit section of each multiple default scrambling code parameter is wrong in order
Accidentally whether rate is lower than a predetermined threshold value, and when finding the bit error rate lower than the predetermined threshold value, then selects the ratio
The default scrambling code parameter is as the physical layer frame scrambling code parameter in the transmitter corresponding to special error rate.
14. physical layer frame scrambling code parameter search circuit as claimed in claim 8, which is characterized in that wherein the selection module is held
Row following steps are according to multiple first bit section and second bit section, to select wherein the one of multiple default scrambling code parameter
A physical layer frame scrambling code parameter as in the transmitter:
A bit error rate between first bit section and second bit section of more each multiple default scrambling code parameter, and
And select the default scrambling code parameter corresponding to minimum one in multiple bit error rates as the object in the transmitter
Manage layer frame scrambling code parameter.
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| CN114449580A (en) * | 2021-12-22 | 2022-05-06 | 西安空间无线电技术研究所 | Method for segmenting and recombining physical layer data of satellite communication system |
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