CN106160927B - Coding/decoding method and device - Google Patents
Coding/decoding method and device Download PDFInfo
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Abstract
The invention relates to a kind of coding/decoding method and devices, and especially a kind of energy originates (Start of Frame according to the frame in header signal in the satellite broadcasting of second generation numerical digit (DVB-S2) system, SOF) phase deviation suffered by sequence influences to compensate, to decode the coding/decoding method and device of 7 order informations of the physical layer signaling code (Physical Layer Signaling Code) in second generation numerical digit broadcasting-satellite system in turn.
Description
Technical field
The invention relates to a kind of coding/decoding method and devices, and especially a kind of energy is according to the satellite broadcasting of second generation numerical digit
(DVB-S2) phase deviation suffered by frame starting (Start of Frame, SOF) sequence in system in header signal influences
Compensate, with so that decode physical layer signaling code (the Physical Layer in second generation numerical digit broadcasting-satellite system
Signaling Code) 7 order informations coding/decoding method and device.
Background technique
DVB-S2 is the second generation numerical digit satellite broadcast standard developed under the basis based on prior-generation DVB-S.Cause
This, compared to DVB-S system, second generation numerical digit broadcasting-satellite system in the performance of the abilities such as transmission capacity, modulation and error correction all
With more preferably performance boost.For example, in the skill of forward error corrigendum (Forward error correction, FEC)
In art, core technology used by second generation numerical digit broadcasting-satellite system is the low-density parity inspection with higher coding gain
(Low-density parity-check, LDPC) code, therefore its error correction energy for not only having greatly improved reception device
Power, the data transmission capacity that also may make second generation numerical digit broadcasting-satellite system to be provided, can reach approach in the extreme to
Ideal data transmission capacity defined in the summer agriculture limit (Shannon Limit).In addition to this, in second generation numerical digit satellite broadcasting
In the standard specification of system, the length of used LDPC code then again can further be divided into normal frames (Normal) with it is short
Two kinds of frame length modes of frame (Short).
Still further aspect, in the transmission process of second generation numerical digit broadcasting-satellite system, mainly using frame (Frame) as
Basic unit is transmitted.Referring to Fig. 1, Fig. 1 is the signal of the frame structure of existing second generation numerical digit broadcasting-satellite system
Figure.Therefore each frame be all via a header signal (PL-Header) partly with a data-signal (Data) part constituted, and
Header signal part is then mainly formed via two sections of special synchronous codes again, wherein one section is 26 symbols and fixed codeword
For (18D2E82)HEXFrame originate (SOF) sequence, and 7 bit (b1 in another Duan Zewei second generation numerical digit broadcasting-satellite system
~b7) physical layer signaling code used Randt's Muller code (Reed-Muller code) carry out encoding operation after, it is acquired
64 symbols coding after physical layer signaling code.
Specifically, the information of this 7 bits (b1~b7) of the physical layer signaling code before coding includes for 5 bits
The MODCOD information of (b1~b5) and the TPYE information of 2 bits (b6~b7), wherein MODCOD information is current to indicate
The modulating mode and code rate of frame, and it is general that the bit b6 in TPYE information, which is then the length to indicate the LDPC code of present frame,
Lead to frame pattern (64800 bit) or short frame pattern (16200 bit), the bit b7 in TPYE information is then current to indicate
Whether the insertion of pilot signal is had in frame.Therefore, header signal part other than the synchronization for being used as reception device, when
After reception device receives and decode this 7 bits (b1~b7) of the in one's duty physical layer signaling code in header signal portion, then may be used
With information such as the modulating modes, code rate and LDPC code length that relatively obtain the present frame for knowing that emitter is transmitted, so that
In enabling entire second generation numerical digit broadcasting-satellite system normally to operate.
In this regard, still will receive transmission due to the coding/decoding method of header signal part in second generation numerical digit broadcasting-satellite system
Brought phase deviation in channel and influenced.Therefore in order to efficiently solve in the prior art to its phase deviation more
Sensitive issue, and the reception device in second generation numerical digit broadcasting-satellite system is quickly and accurately decoded and is worked as
This 7 order informations of physical layer signaling code in preceding header signal need a kind of new second generation numerical digit broadcasting-satellite system
The coding/decoding method and device of physical layer signaling code.
Summary of the invention
The embodiment of the present invention provides a kind of coding/decoding method, to decode the physics in second generation numerical digit broadcasting-satellite system
7 bits of layer signaling code.The step of coding/decoding method, is as follows.Firstly, receiving the header signal with M symbol.Secondly,
Skew is carried out using M1 symbol of the frame homing sequence in this M symbol and estimates operation, to calculate phase compensation value.Most
Afterwards, determine physical layer signaling using M2 symbol after the frame homing sequence in this phase compensation value and this M symbol
7 bits of code.Wherein M, M1 and M2 are all positive integer, and M is equal to the sum of M1 and M2.
The embodiment of the present invention separately provides a decoding apparatus, to decode the physics in second generation numerical digit broadcasting-satellite system
7 bits of layer signaling code.The decoding apparatus includes receiving module, skew estimation module and processing module.Receiving module
To receive the header signal with M symbol.Skew estimation module is accorded with using M1 of the frame homing sequence in this M symbol
Code carries out skew and estimates operation, to calculate phase compensation value.Processing module then uses in this phase compensation value and this M symbol
Frame homing sequence after M2 symbol determine 7 bits of physical layer signaling code.Wherein M, M1 and M2 are all positive whole
Number, and M is equal to the sum of M1 and M2.
In conclusion a kind of coding/decoding method and device provided by the embodiment of the present invention, can efficiently solve existing skill
The physical layer signaling code of second generation numerical digit broadcasting-satellite system is easy the problem of being influenced by phase deviation in art.In addition, second
In the cataloged procedure of the physical layer signaling code of algebra position broadcasting-satellite system, coding mode has certain characteristic rule, therefore,
Coding/decoding method and device provided by the embodiment of the present invention can use the characteristic rule in this coding mode as Given information,
And then 7 order informations of the physical layer signaling code in current header signal are quickly and accurately decoded, to reduce decoding
Operation time and operand, and promote its decoding performance.
For the enabled feature and technology contents for being further understood that the present invention, please refer to below in connection with it is of the invention specifically
Bright and attached drawing, but these explanations are only rather than to appoint to interest field of the invention for illustrating the present invention with institute's accompanying drawings
What limitation.
Detailed description of the invention
Fig. 1 is the schematic diagram of the frame structure of existing second generation numerical digit broadcasting-satellite system.
Fig. 2A is the schematic diagram of the coding mode of physical layer signaling code provided by the embodiment of the present invention.
Fig. 2 B is the schematic diagram of the coding mode of physical layer signaling code provided by another embodiment of the present invention.
Fig. 3 is the flow diagram of coding/decoding method provided by the embodiment of the present invention.
Fig. 4 is the flow diagram that phase compensation value is calculated in coding/decoding method provided by the embodiment of the present invention.
Fig. 5 A be in coding/decoding method provided by the embodiment of the present invention using phase compensation value and determine physical layer believe
Enable the flow diagram of 7 bits of code.
Fig. 5 B is using phase compensation value and to determine physics in coding/decoding method provided by another embodiment of the present invention
The flow diagram of 7 bits of layer signaling code.
Fig. 6 is the flow diagram of coding/decoding method provided by another embodiment of the present invention.
Fig. 7 is the 6th bit for determining physical layer signaling code in coding/decoding method provided by another embodiment of the present invention
Bit value flow diagram.
Fig. 8 is the function block schematic diagram of decoding apparatus 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.
Coding/decoding method and device provided by the embodiment of the present invention can be adapted for second generation numerical digit broadcasting-satellite system
In any reception device, in other words, the present invention is not intended to limit the specific implementation of second generation numerical digit broadcasting-satellite system.Except this
Except, the physical layer signaling code after encoding under normal circumstances also needs scrambled and modulation processing, just can be via the
The sending device of two algebra position broadcasting-satellite systems is transmitted, and the right present invention is not intended to limit second generation numerical digit satellite broadcasting system
Transmitted physical layer signaling code unite in the detailed implementation for scrambling and modulating, has usually intellectual in the art
It can be designed according to actual demand or application.
Fig. 2A is please referred to, Fig. 2A is the schematic diagram of the coding mode of physical layer signaling code provided by the embodiment of the present invention.
Specifically, physical layer signaling code b1~b7 of second generation numerical digit broadcasting-satellite system is the binary system of 7 bits of total length
Code, wherein preceding 6 bit b1~b6 of this physical layer signaling code, then can be transported via 6 × 32 known encoder matrix G
It calculates, to produce code word y1~y32 that total length is 32 bits, and code word y1 is as first code word exported.Code word y1
After delay using 1 bit, exclusive or (XOR) operation can be carried out with the 7th bit b7 of this physical layer signaling code, to generate code
Second code word of the word y1 ⊕ b7 as output, then, code word y2 by the third code word as output, other export the 4th
~64 code words then can and so on.Have this it is found that this physical layer signaling code b1~b7 after coding, it will produce total
Length is coded sequence y1, y1 ⊕ b7, y2, y2 ⊕ b7~y32, the y32 ⊕ b7 of 64 bits.Then, to this 64 bits
Coded sequence is scrambled, and does the modulation of pi/2-BPSK again, to produce physics after the coding that total length is 64 symbols
Layer signaling code d1~d64.Above-mentioned 6 × 32 encoder matrix G is expressed as follows:
Furthermore, it is understood that the second code word y1 ⊕ b7 exported in coded sequence is not the first code word y1 phase with output
It together, is exactly exactly the opposite with the first code word y1.It is thus appreciated that due to the influence of XOR operation, second code being exported
Word y1 ⊕ b7's as a result, value for the 7th bit b7 that can depend entirely on physical layer signaling code is learnt, and so on.
In this regard, the calculating process of preceding 6 bits and encoder matrix G of the physical layer signaling code in the embodiment of the present invention, it can letter in turn
It is melted into following equation sequence:
Equation (1)
Then, if the bit value of the 7th bit b7 of physical layer signaling code is 0, coded sequence is expressed as [y1,
y1,y2,y2,y3,y3,......,y30,y30,y31,y31,y32,y32], if the bit value of the 7th bit b7 of physical layer signaling code
When being 1, then coded sequence is expressed asWhereinIt indicates
To be taken on the contrary to y.
In addition, the usually intellectual of having should be appreciated that in the art according to above teaching, believe in this physical layer
During the coding mode for enabling code, the coded sequence of this 64 bits is scrambled, can see as is using one 64
Scrambler sequence [the s of a bit1,s2,s3,......,s62,s63,s64] to carry out XOR operation to this coded sequence, to produce
Coded sequence [p after the scrambling code of 64 bits1,p2,p3,......,p62,p63,p64].Then, by coded sequence [p after scrambling code1,
p2,p3,......,p62,p63,p64] modulation of pi/2-BPSK is carried out, to produce physics after the coding that total length is 64 symbols
Layer signaling code d1~d64, result can be simplified to the expression of following equation sequence in turn:
Equation (2)
Still further aspect, please refers to Fig. 2 B, and Fig. 2 B is the volume of physical layer signaling code provided by another embodiment of the present invention
The schematic diagram of code mode.The coding mode of mode compared to Fig. 2A, Fig. 2 B physical layer signaling code is, it is only necessary to by this physics
7 bit b1~b7 of layer signaling code, directly carry out operation with 7 × 64 encoder matrix G ', to produce total length as 64
The coded sequence of a bit.Then, similarly the coded sequence of this 64 bits is scrambled, and is pi/2-BPSK's again
Modulation, to produce physical layer signaling code d1~d64 after the coding that total length is 64 symbols.Above-mentioned 7 × 64 encoder matrix G '
Then it is expressed as follows:
It therefore, can be further in simplification figure 2A to produce the coded sequences of 64 bits by the prior art
Mode, simplified result are expressed as:
Equation (3)
, that is to say, that in aforesaid equation (3), 7 of the physical layer signaling code of second generation numerical digit broadcasting-satellite system
Bit b1~b7 will can be and directly carry out operation via with this 7 × 64 encoder matrix G ', to produce total length as 64 positions
Coded sequence c1~c64 of member.
Teaching according to the above, the usually intellectual of having should be appreciated that in the art, in Fig. 2 B physical layer
In the coding mode of signaling code, this 7 × 64 encoder matrix G ' is equivalent to Randt Mu being considered as one by parameter RM (1,6)
Strangle code matrix generated.Therefore, in the coding/decoding method provided by the embodiment of the present invention, coded sequence after descrambling can be with
It is that operation is carried out using Hadamard decoding algorithm, to decode 7 of the physical layer signaling code in current header signal in turn
Order information.
Still further aspect, in the transmission process of second generation numerical digit broadcasting-satellite system, due to simultaneously in view of frequency with
It is influenced brought by phase deviation, therefore physical layer signaling code d1~d64 is after via transmission channel after coding, so that receiving
Signal received by device can be indicated further with following equation:
.Equation (4)
Wherein n=1,2 ..., 63,64, r (n) be signal received by reception device, and α is declining for transmission channel
The weak factor, ΔfFor frequency departure, TSFor signal interval, θ is initial phase deviation, and w (n) is additive property additive white Gaussian
(Additive White Gaussian Noise, AWGN), ε=ΔfTSFor normalized frequency deviation.
Therefore, teaching according to the above, the usually intellectual of having should be appreciated that in the art, above-mentioned parameter
ε is that the signal r (n) received can be caused greatly to change to influence.In this regard, following more will be directed to above-mentioned reception using one
To signal r (n) carry out the example of existing coding/decoding method and explain, parameter ε is further explained out for decoding object
Manage brought actual influence when this 7 order informations of layer signaling code.
Firstly, received signal r (n) can be carried out the demodulation of pi/2-BPSK by reception device, after demodulating
As a result it can further be indicated with following equation:
Equation (5)
WhereinAnd when n is odd numberWhen for 1, n being even number
For-j.Then, the result after demodulation is descrambled, the result after descrambling is expressed as:
Equation (6)
Wherein due to snAnd cnFor non-zero i.e. 1 binary system bit value, therefore has usually intellectual in the art and exist
After the method for exhaustion, it should can easily understand that and verify the establishment of following formula: (1-2sn)[1-2(sn⊕cn)]=(1-
2cn), therefore no longer add redundant in this.In addition, w2(n)=(1-2sn)w1And (1-2s (n),n) be expressed as scrambler sequence and modulating
The form in domain.Finally, the result after descrambling is made operation with 64 × 64 Hadamard matrixes, to obtain one 1 × 64 phase
Pass is worth vector, and the result simplified is expressed as:
Equation (7)
Wherein m=1,2 ..., 63,64, h (m, n) thus the m row of 64 × 64 Hadamard matrixes and n-th column member
Element value, and
Then, the column index value of squared absolute value the maximum of all elements in this correlation vector is found out, i.e.,And in turn by by this column index valueBinary code is converted to, to decode present frame
The bit value of the 1st to the 5th and the 7th bit (b1~b5 and b7) in head signal in 7 bits of physical layer signaling code.
Finally, similarly it is found that in ideal conditions (for example, without frequency deviation, without skew and noiseless etc.), this correlation to
Column index value in amountCorresponding elementFollowing equation should be represented by:
Equation (8)
In this regard, it will be apparent that, reception device is can be further through to elementCarry out the side of hard decision
Formula, the bit value of the 6th bit (b6) in 7 bits to determine physical layer signaling code in current header signal.There is mirror
In this, teaching according to the above, the usually intellectual of having be should be appreciated that in the art, only in parameter ε very little
In the case where, reception device is possible to correctly decode out this 7 bits of the physical layer signaling code in current header signal
Information.
Therefore, reception device also needs to first pass through at the frequency deviation for carrying out the signal r (n) received coarse adjustment under normal circumstances
Reason, can just start to be decoded header signal, the right present invention is not intended to limit second generation numerical digit broadcasting-satellite system in coarse adjustment
The detailed implementation of frequency offset processing, the usually intellectual of having can set according to actual demand or application in the art
Meter.
It is worth noting that, in order to further explain about phase deviation for decoding second generation numerical digit satellite broadcasting
It is influenced brought by 7 order informations of physical layer signaling code in system, therefore the present invention can be then further to assume ginseng
The example (i.e. 2 π ε n+ θ ≈ θ) of number ε very little explains.In this regard, similarly it is found that reception device is finding out correlation vector
In all elements squared absolute value the maximum column index value when, result further can carry out table with following equation
Show:
Equation (9)
Still further aspect can further simplify the correlation vector in aforesaid equation (9) through the prior art
In all elements squared absolute value, simplified result i.e. be expressed as:
Equation (10)
Wherein in equation (10) And it is expressed as influencing brought by noise.Therefore, equation (9) can letter
Chemical conversion is following to be indicated:
Equation (11)
Therefore, teaching according to the above, the usually intellectual of having should be appreciated that in the art, initial phase
Deviation θ only appears in noise item PW(m) in, without in α2f2(m) in, so when looking for rope of falling out in reception device
Draw valueDuring, it influences to ignore brought by initial phase deviation θ to lose.In other words, θ pairs of initial phase deviation
The the 1st to the 5th and the 7th bit (b1~b5 and b7) of physical layer signaling code in current header signal is decoded in reception device
Bit value does not have any influence.
On the contrary, when reception device will be by elementHard decision is carried out to determine object in current header signal
Manage layer signaling code the 6th bit (b6) bit value when, by the prior art can further by its result be reduced to as
Lower expression:
Equation (12)
Therefore, even if to noise item w in equation (12)3(n) ignore if loseing,Still belong to is one
Real number, it is apparent that elementIt will receive the influence of initial phase deviation θ, therefore initial phase deviation θ is for reception device
Whether the bit value of 6th bit (b6) of in current header signal physical layer signaling code can be correctly decoded out with larger
Influence power.In this regard, the coding/decoding method main spirits of the embodiment of the present invention are in that the phase estimated in header signal is inclined
Difference, and whereby to elementIt compensates, quickly and accurately to decode the physics in current header signal
7 order informations of layer signaling code.In addition, as previously described, due to including one section of 26 symbol and fixation in header signal
Code word is the frame homing sequence of (18D2E82) HEX.Therefore, the usually intellectual of having should be appreciated that in the art, above-mentioned
The phase deviation estimation carried out in header signal, be can be further to be estimated using received frame homing sequence
It surveys.
Referring to Fig. 3, Fig. 3 is the flow diagram of coding/decoding method provided by the embodiment of the present invention.Firstly, in step
In S301, the header signal with M symbol is received.Secondly, using frame homing sequence in this M symbol in step S303
M1 symbol carry out skew estimate operation, to calculate phase compensation value.Finally, using phase compensation in step S305
Value determines 7 bits of physical layer signaling code with M2 symbol after frame homing sequence in this M symbol.Wherein M, M1
It is all positive integer with M2, and M is equal to the sum of M1 and M2.
As previously described, coding/decoding method provided by the embodiment of the present invention is suitable for second generation numerical digit satellite broadcasting system
System, but the present invention is not limited to this.Therefore, if for specification institution standard according to second generation numerical digit broadcasting-satellite system,
90 symbols of header signal are believed via physical layer after the frame homing sequence of 26 fixed symbols and the coding of 64 symbols
Code is enabled to be formed, that is to say, that above-mentioned parameter M will be equal to 90, and M1 is equal to 26 and M2 and is equal to 64.
Still further aspect, in order to further explain about the technological means for calculating phase compensation value in step S303,
One of detailed implementation that will be described in detail respectively in step S303 below, it is not intended to limiting the invention.Please refer to figure
4, Fig. 4 be the flow diagram that phase compensation value is calculated in coding/decoding method provided by the embodiment of the present invention.In Fig. 4 part with
Fig. 3 identical process step is indicated with identical figure number, therefore this will not be detailed here its details.
It include step S401~step S403 please refer to Fig. 3 and Fig. 4, in step S303.Firstly, in step S401
In, accumulating operation is carried out after adjusting the symbol value of M1 symbol of frame homing sequence to first quartile, to acquire vector
Deviation.Then, in step S403, operation is carried out to this vector deviation using arctan function, is calculated whereby pair
Answer the digital baseband input signal of this vector deviation as phase compensation value.
Specifically, it is assumed that this frame homing sequence is expressed as [a1, a2 ... ..., a26] (i.e. M1 is equal to when at the beginning
26) when, this frame homing sequence is filled by equation (4) it can be found that receive after the modulation treatment of pi/2-BPSK
Setting received frame homing sequence should further be expressed as:
Equation (13)
Wherein m=1,2 ..., 25,26,It is expressed as by pi/2-BPSK's
Frame homing sequence after modulation treatment, and wsofIt (m) is additive property additive white Gaussian.Similarly, when it is assumed that parameter ε very
Under small example (i.e. 2 π ε n+ θ ≈ θ), equation (13) can further be simplified to indicate as follows:
Equation (14)
In this regard, carrying out operation in step S401 can be expressed as with the equation for acquiring vector deviation:
Equation (15)
WhereinIt is expressed as noise component(s).
Then, corresponding this vector deviation A is calculated in step S403sofThe equation of digital baseband input signal can table
It is shown as follows:
Equation (16)
Therefore, teaching according to the above, the usually intellectual of having should be appreciated that in the art, in step
In S305, reception device is being further according to this digital baseband input signalAs phase compensation value, to element
It compensates, quickly and accurately to decode the information of 7 bits of the physical layer signaling code in current header signal.For
Further explain the technology hand about 7 bits that physical layer signaling code is compensated and determined in step S305
Section, one of detailed implementation that will be described in detail respectively in step S305 below, it is not intended to limiting the invention.It please refers to
Fig. 5 A, Fig. 5 A are using phase compensation value and to determine physical layer signaling code in coding/decoding method provided by the embodiment of the present invention
7 bits flow diagram.The part process step identical as Fig. 3 is indicated in Fig. 5 A with identical figure number, therefore herein
Its details is no longer described in detail.
It include step S501~step S505 please refer to Fig. 3 and Fig. 5 A, in step S305.Firstly, in step
In S501, M2 symbol is descrambled to produce the first coded sequence, and using Hadamard decoding algorithm come to first
Coded sequence carries out operation, to acquire the first decoded vector of 1 × M2 of corresponding first coded sequence.Secondly, in step
In S503, physical layer is determined according to the column index value of squared absolute value the maximum of all elements in the first decoded vector
The bit value of the 1st to the 5th and the 7th bit in 7 bits of signaling code.Finally, being mended in step S505 using this phase
It repays value to carry out phase compensation to element corresponding to column index value, and determines 7 bits of physical layer signaling code whereby
In the 6th bit bit value.
Specifically, step S501 is the detailed decoding step of aforesaid equation (6) Yu (7), therefore no longer adds in this
Redundant.It is worth noting that, the detailed technology means of so-called Hadamard decoding algorithm can also be in step S501
One coded sequence carries out Fast Hadamard conversion (FHT), to obtain the first decoded vector of 1 × M2.To sum up, the present invention is simultaneously
Do not limit the specific implementation of Hadamard decoding algorithm, in the art the usually intellectual of having can according to actual demand or
Using being designed.
Still further aspect, step S503 are known the 1st to the 5th and the 7th bit for decoding physical layer signaling code
Detailed decoding step, therefore no longer add redundant in this.In addition to this, the column index value after phase compensation is carried out in step S505
Corresponding element is represented byTherefore, determine the 6th position of physical layer signaling code in step S505
The hard decision rule of the bit value of member can be simplified shown as follows:
Equation (17)
In other words, equation (17) will be according to element corresponding to the column index value after phase compensation's
The sum of real part and imaginary part, the bit value of the 6th bit in 7 bits to determine physical layer signaling code.
Still further aspect, multiple refering to Fig. 3, the usually intellectual of having should be appreciated that in the art, in step S305
In, it is also possible to according to this digital baseband input signalAs phase compensation value, after being compensated to the signal r (n) received,
Decode the information of 7 bits of the physical layer signaling code in current header signal whereby again.Therefore, Fig. 5 B is please referred to, is schemed
5B is using phase compensation value and to determine the 7 of physical layer signaling code in coding/decoding method provided by another embodiment of the present invention
The flow diagram of a bit.The part process step identical as Fig. 3 and Fig. 5 A is indicated in Fig. 5 B with identical figure number, therefore
Its details is no longer described in detail in this.
It include step S507, step S503 and step S509 in step S305 please refer to Fig. 3 and Fig. 5 B.Firstly,
In step s 507, phase compensation is carried out to M2 symbol using phase compensation value, and to M2 symbol after phase compensation
Code value is descrambled to produce the first coded sequence, and is transported using Hadamard decoding algorithm to the first coded sequence
It calculates, to acquire the first decoded vector of 1 × M2 of corresponding first coded sequence.Secondly, in step S503, according to the first solution
The column index value of squared absolute value the maximum of all elements in code vector determines in 7 bits of physical layer signaling code
The bit value of 1st to the 5th and the 7th bit.Finally, in step S509, according to the real part of element corresponding to column index value with
The sum of imaginary part, the bit value of the 6th bit in 7 bits to determine physical layer signaling code.
That is, the process step compared to Fig. 5 A, is in place of the difference of Fig. 5 B, reception device will be first according to
According to the calculated phase compensation value of institute, directly to be compensated to physical layer signaling code after received coding, and in turn
Physical layer signaling code has all offseted digital baseband input signal after all codings receivedAfter brought influence, reception device
7 order informations of physical layer signaling code are decoded known coding/decoding method can be used.
Therefore, this M2 symbol value is represented by { r (n) e after carrying out phase compensation in step s 507-jθ, n=1,
2,......,64}.In addition, in step s 507, the detailed technology means of so-called descrambling and Hadamard decoding algorithm, as
The detailed step of aforesaid equation (6) and (7), therefore no longer add redundant in this.
Significantly, since reception device is first for object after received coding in the embodiment of Fig. 5 B
Reason layer signaling code has carried out phase compensation.Therefore, by element in step S509It makes decisions to determine to work as
The detailed technology means of the bit value of 6th bit (b6) of physical layer signaling code, as known hard decision in preceding header signal
Detailed step, therefore no longer add redundant in this.
As previously described, element corresponding to column index valueIt is easy to be influenced by initial phase deviation θ, therefore just
Whether beginning phase deviation θ can correctly decode out reception device the 6th of physical layer signaling code in current header signal
The bit value of bit (b6) has large effect power.Still further aspect, by the teaching of equation (15), in the art
Having usually intellectual should be appreciated that, the acquired vector deviation A of reception devicesofAlso it can be mended directly as this phase
Value is repaid, to element corresponding to column index valueIt compensates, quickly and accurately to decode current frame head letter
The information of 7 bits of the physical layer signaling code in number.
Therefore, referring to Fig. 6, Fig. 6 is the flow diagram of coding/decoding method provided by another embodiment of the present invention.Fig. 6
The middle part process step identical as Fig. 3, Fig. 5 A is indicated with identical figure number, therefore this will not be detailed here its details.
Please refer to Fig. 3, Fig. 4, Fig. 5 A and Fig. 6, it can be found that the process step compared to Fig. 4 and Fig. 5 A, the difference of Fig. 6
Different place is that the step S303 in Fig. 6 comprises only step S601, and step S305 includes step S501~step S503
With step S603.
Specifically, in step s 601, reception device the symbol value of M1 symbol of frame homing sequence can be adjusted to
After first quartile, and added up to calculate this vector deviation as phase compensation value.
Finally, reception device is then using this phase compensation value come to member corresponding to column index value in step S603
Element carries out plus and minus calculation, and determines the bit value of the 6th bit in 7 bits of physical layer signaling code whereby.
Specifically, by equation (15) it can be found that in step s 601, reception device is changed to directly adopt
The calculated vector deviation A of institutesofAs this phase compensation value, therefore it can dispense and carry out equation in reception device
The arctan function operation of formula (16) so that can reduce time and the operand of decoding operation, and promotes its decoding property
Energy.Similarly it is found that in step S603, reception device will be bound to change using the compensation and judgement for being different from equation (17)
Rule.
In order to further explain the technological means about step S603, will be described in detail in step S603 respectively wherein below
A kind of detailed implementation, it is not intended to limiting the invention.Referring to Fig. 7, Fig. 7 is provided by another embodiment of the present invention
Determine the flow diagram of the bit value of the 6th bit of physical layer signaling code in coding/decoding method.Part and Fig. 6 phase in Fig. 7
With process step indicated with identical figure number, therefore this will not be detailed here its details.
It include step S701~step S707 please refer to Fig. 6 and Fig. 7, in step S603.Firstly, in step S701
In, reception device carries out add operation and subtraction fortune using this phase compensation value respectively to element corresponding to column index value
It calculates, and takes absolute value square to the result of addition and subtraction, acquire the first metric respectively whereby and measured with second
Value.Then, in step S703, reception device judges whether the first metric is greater than the second metric.In step S705, if
When first metric is greater than the second metric, then reception device determines the 6th bit in 7 bits of physical layer signaling code
Bit value is 0.In step S707, if the first metric is less than or equal to the second metric, reception device determines physics
The bit value of the 6th bit in 7 bits of layer signaling code is 1.
Specifically, by the teaching of equation (8), the usually intellectual of having be should be appreciated that in the art,
Ideally, if the bit value of the 6th bit (b6) of physical layer signaling code is 0, institute is calculated in equation (15)
Vector deviation AsofIt should be with the column index value in vectorCorresponding elementJust in the same direction.Conversely, if physics
When the bit value of 6th bit (b6) of layer signaling code is 1, the calculated vector deviation A of institute in equation (15)sofIt should
With the column index value in vectorCorresponding elementIt is just reversed.Therefore, teaching according to the above, in step
Table can be simplified with the decision rule for determining the bit value of the 6th bit of physical layer signaling code in rapid S701~step S707
It is shown as follows:
Equation (18)
In conclusion coding/decoding method provided by the embodiment of the present invention, can efficiently solve the second generation in the prior art
The physical layer signaling code of numerical digit broadcasting-satellite system is easy the problem of being influenced by phase deviation.In addition, in second generation numerical digit satellite
In the cataloged procedure of the physical layer signaling code of broadcast system, coding mode has certain characteristic rule.Therefore, the present invention is implemented
Coding/decoding method and device provided by example can use the characteristic rule in this coding mode as Given information, so it is quick and
Accurately decode 7 order informations of the physical layer signaling code in current header signal, thus reduce decoding computing time with
Operand, and promote its decoding performance.
In order to further explain the operation workflow about coding/decoding method, the present invention further provides the one of its coding/decoding method
Kind embodiment.Referring to Fig. 8, Fig. 8 is the function block schematic diagram of decoding apparatus provided by the embodiment of the present invention.However,
Following decoding apparatus 8 is only one of implementation of the above method, and it is not intended to limiting the invention.
The decoding apparatus 8 is to decode 7 of the physical layer signaling code in second generation numerical digit broadcasting-satellite system
Bit.The decoding apparatus 8 may include receiving module 81, skew estimation module 83 and processing module 85.Above-mentioned each group
Part can be through pure hardware circuit and realize, or arrange in pairs or groups firmware or software to realize, in short, this hair by hardware circuit
The bright specific implementation for being not intended to limit decoding apparatus 8.
Receiving module 81 is to receive the header signal with M symbol.Skew estimation module 83 uses in this M symbol
Frame homing sequence M1 symbol carry out skew estimate operation, to calculate phase compensation value.Processing module 85 then uses this
Phase compensation value determines 7 bits of physical layer signaling code with M2 symbol after the frame homing sequence in M symbol.
Wherein M, M1 and M2 are all positive integer, and M is equal to the sum of M1 and M2.
The example that will be used below the coding mode of Fig. 2A or Fig. 2 B physical layer signaling code is illustrated, but the present invention is not
It is defined in this.Please refer to Fig. 2A, Fig. 2 B, Fig. 3, Fig. 4 and Fig. 5 A, the physical layer in second generation numerical digit broadcasting-satellite system is believed
7 bit b1~b7 of code are enabled to carry out encoding operation, and after scrambled and modulation, to produce total length as 64 symbols
Coding after physical layer signaling code.In addition, detailed coding is as in the foregoing embodiment with decoding step process, it is no longer more in this
Add redundant.
If for the specification institution standard according to second generation numerical digit broadcasting-satellite system, 90 symbols of header signal be through
It is made of physical layer signaling code after the frame homing sequence of 26 fixed symbols and the coding of this 64 symbols, that is to say, that
Above-mentioned parameter M will be equal to 90, and M1 is equal to 26 and M2 and is equal to 64.
Firstly, receiving module 81 is to receive this header signal from the transmission of second generation numerical digit broadcasting-satellite system.Phase
Inclined estimation module 83 carries out accumulating operation after adjusting the symbol value of M1 symbol of frame homing sequence to first quartile, to obtain
Obtain vector deviation, and operation carried out to this vector deviation using arctan function, calculate whereby it is corresponding this to
The digital baseband input signal of deviation is measured as phase compensation value.Detailed steps flow chart is as in the foregoing embodiment, therefore no longer in this
Add redundant.
Still further aspect, processing module 85 descrambles M2 symbol to produce the first coded sequence, and uses
Hadamard decoding algorithm to carry out operation to the first coded sequence, to acquire the first of 1 × M2 of corresponding first coded sequence
Decoded vector.Then, the column of 85 pairs of processing module squared absolute value the maximum according to all elements in the first decoded vector
The bit value of the 1st to the 5th and the 7th bit in 7 bits of the index value to determine physical layer signaling code.Finally, processing
Module 85 carries out phase compensation to element corresponding to column index value using this phase compensation value, and determines physics whereby
The bit value of the 6th bit in 7 bits of layer signaling code.Detailed steps flow chart is as in the foregoing embodiment, therefore in this
No longer add redundant.
Furthermore, it is understood that the purpose of processing module 85 is in that, calculated digital baseband input signal is come only to column index value
Corresponding element compensates, with so that quickly and accurately decode physical layer signaling code in current header signal it
The information of 7 bits.
Still further aspect, as previously described, processing module 85 are also possible to first come according to the calculated phase compensation value of institute
Directly physical layer signaling code after received coding is compensated.Therefore the physical layer signaling after all codings received
Code has all offseted after influencing brought by digital baseband input signal, and processing module 85 is solved known coding/decoding method can be used
Code goes out 7 order informations of physical layer signaling code.
Therefore, please refer to Fig. 2A, Fig. 2 B, Fig. 3, Fig. 4 and Fig. 5 B, processing module 85 is using phase compensation value come to M2
A symbol carries out phase compensation, and is descrambled M2 symbol value after phase compensation to produce the first coded sequence,
And Hadamard decoding algorithm is corresponded to using Hadamard decoding algorithm the first coded sequence 1 × M2 first decode to
Amount.Then, processing module 85 is determined according to the column index value of squared absolute value the maximum of all elements in the first decoded vector
Make the bit value of the 1st to the 5th and the 7th bit in 7 bits of physical layer signaling code.Finally, 85 basis of processing module
The sum of the real part of element corresponding to column index value and imaginary part, the 6th bit in 7 bits to determine physical layer signaling code
Bit value.Detailed steps flow chart is as in the foregoing embodiment, therefore no longer adds redundant in this.
Still further aspect, as previously described, decoding apparatus 8 are also possible to directly change using a calculated vector deviation
As this phase compensation value, further to dispense the arctan function operation carried out in skew estimation module 83, from
And time and the operand of decoding operation will can be reduced, and promote its decoding performance.Therefore, please refer to Fig. 3, Fig. 5 A,
Fig. 6 and Fig. 7 it is found that skew estimation module 83 can adjust the symbol value of M1 symbol of frame homing sequence to first quartile,
And it is added up to calculate this vector deviation as phase compensation value.Detailed steps flow chart such as previous embodiment institute
It states, therefore no longer adds redundant in this.
Still further aspect, processing module 85 carry out element corresponding to column index value using this phase compensation value respectively
Add operation and subtraction, and take absolute value square to the result of addition and subtraction, acquire respectively whereby
One metric and the second metric.Then, processing module 85 judges whether the first metric is greater than the second metric.If first degree
When magnitude is greater than the second metric, then processing module 85 determines the bit of the 6th bit in 7 bits of physical layer signaling code
Value is 0.Conversely, if processing module 85 determines the 7 of physical layer signaling code when the first metric is less than or equal to the second metric
The bit value of the 6th bit in a bit is 1.
In conclusion coding/decoding method and device provided by the embodiment of the present invention, can efficiently solve in the prior art
The physical layer signaling code of second generation numerical digit broadcasting-satellite system is easy the problem of being influenced by phase deviation.In addition, in the second algebra
In the cataloged procedure of the physical layer signaling code of position broadcasting-satellite system, coding mode has certain characteristic rule.Therefore, this hair
Coding/decoding method provided by bright embodiment and device can use the characteristic rule in this coding mode as Given information, in turn
7 order informations for quickly and accurately decoding the physical layer signaling code in current header signal, to reduce decoding operation
Time and operand, and promote its decoding performance.
The foregoing is merely embodiments of the present invention, are not the scope of the patents to limit to the present invention.
[symbol description]
B1~b7: physical layer signaling code
G, G ': encoder matrix
SOF: frame homing sequence
PL-Header: header signal
Data: data-signal
S301~S305, S401~S403, S501~S509, S601~S603, S701~S707: process step
8: decoding apparatus
81: receiving module
83: skew estimation module
85: processing module.
Claims (16)
1. a kind of coding/decoding method, to decode the physical layer signaling in the satellite broadcasting of second generation numerical digit (DVB-S2) system
7 bits of code (Physical Layer Signaling Code), which is characterized in that the coding/decoding method includes:
(a) header signal with M symbol is received；
(b) a skew estimation is carried out using the M1 symbol of one of M symbol frame starting (Start of Frame) sequence
Operation, to calculate a phase compensation value；And
(c) determine the object using M2 symbol after the frame homing sequence in the phase compensation value and the M symbol
Manage 7 bits of layer signaling code；
Wherein M, M1 and M2 are all positive integer, and M is equal to the sum of M1 and M2.
2. coding/decoding method as described in claim 1, wherein in step (b), by the M1 symbol of the frame homing sequence
Symbol value carries out accumulating operation to obtain a vector deviation after adjusting to first quartile, and uses an arc tangent (arctan)
Function to carry out operation to the vector deviation, calculates a digital baseband input signal of the corresponding vector deviation whereby as the phase
Position offset.
3. coding/decoding method as claimed in claim 2 wherein includes: in step (c)
(c1) the M2 symbol is descrambled to produce one first coded sequence, and uses a Hadamard
(Hardamard) decoding algorithm to carry out operation to first coded sequence, with acquire corresponding first coded sequence 1 ×
One first decoded vector of M2；
(c2) determined according to a column index value of squared absolute value the maximum of all elements in first decoded vector
The bit value of the 1st to the 5th and the 7th bit in 7 bits of the physical layer signaling code；And
(c3) phase compensation is carried out to element corresponding to the column index value using the phase compensation value, and determined whereby
The bit value of the 6th bit in 7 bits of the physical layer signaling code.
4. coding/decoding method as claimed in claim 3, wherein in step (c3), it will be according to the column index value after phase compensation
The sum of the real part of corresponding element and imaginary part, the position of the 6th bit in 7 bits to determine the physical layer signaling code
Member value.
5. coding/decoding method as claimed in claim 2 wherein includes: in step (c)
(c1) phase compensation is carried out to the M2 symbol using the phase compensation value, and to this M2 symbol after phase compensation
Code value is descrambled to produce one first coded sequence, and using a Hadamard decoding algorithm come to first coded sequence
Operation is carried out, to obtain one first decoded vector of 1 × M2 of corresponding first coded sequence；
(c2) this is determined according to a column index value of squared absolute value the maximum of all elements in first decoded vector
The bit value of the 1st to the 5th and the 7th bit in 7 bits of physical layer signaling code；And
(c3) the sum of the real part of the element according to corresponding to the column index value and imaginary part, come determine the physical layer signaling code this 7
The bit value of the 6th bit in a bit.
6. coding/decoding method as described in claim 1, wherein in step (b), by the M1 symbol of the frame homing sequence
Symbol value is adjusted to first quartile, and is added up to calculate a vector deviation as the phase compensation value.
7. coding/decoding method as claimed in claim 6 wherein includes: in step (c)
(c1) the M2 symbol is descrambled to produce one first coded sequence, and come using a Hadamard decoding algorithm
Operation is carried out to first coded sequence, to obtain one first decoded vector of 1 × M2 of corresponding first coded sequence；
(c2) determined according to a column index value of squared absolute value the maximum of all elements in first decoded vector
The bit value of the 1st to the 5th and the 7th bit in 7 bits of the physical layer signaling code；And
(c3) plus and minus calculation is carried out to element corresponding to the column index value using the phase compensation value, and determined whereby
The bit value of the 6th bit in 7 bits of the physical layer signaling code.
8. coding/decoding method as claimed in claim 7, wherein step (c3) further comprises:
(c31) one add operation is carried out to element corresponding to the column index value using the phase compensation value respectively and one is subtracted
Method operation, and take absolute value square to the result of the addition and the subtraction, acquire one first metric respectively whereby
With one second metric；
(c32) judge whether first metric is greater than second metric；
(c33) if first metric is greater than second metric, the in 7 bits of the physical layer signaling code is determined
The bit value of 6 bits is 0；And
(c34) if first metric is less than or equal to second metric, 7 bits of the physical layer signaling code are determined
In the 6th bit bit value be 1.
9. a kind of decoding apparatus, to decode 7 of the physical layer signaling code in a second generation numerical digit broadcasting-satellite system
Bit, which is characterized in that the decoding apparatus includes:
One receiving module, to receive the header signal with M symbol；
One skew estimation module carries out a skew using M1 symbol of one of M symbol frame homing sequence and estimates operation,
To calculate a phase compensation value；And
One processing module is determined using M2 symbol after the frame homing sequence in M symbol of the phase compensation value and this
Make 7 bits of the physical layer signaling code；
Wherein M, M1 and M2 are all positive integer, and M is equal to the sum of M1 and M2.
10. decoding apparatus as claimed in claim 9, wherein the skew estimation module accords with this M1 of the frame homing sequence
The symbol value of code carries out accumulating operation to obtain a vector deviation after adjusting to first quartile, and uses an arctan function
To carry out operation to the vector deviation, the digital baseband input signal for producing the corresponding vector deviation whereby is mended as the phase
Repay value.
11. decoding apparatus as claimed in claim 10, wherein the processing module is configured to execute following steps:
(S1) the M2 symbol value is descrambled to produce one first coded sequence, and uses a Hadamard decoding algorithm
To carry out operation to first coded sequence, to acquire one first decoded vector of 1 × M2 of corresponding first coded sequence；
(S2) this is determined according to a column index value of squared absolute value the maximum of all elements in first decoded vector
The bit value of the 1st to the 5th and the 7th bit in 7 bits of physical layer signaling code；And
(S3) phase compensation is carried out to element corresponding to the column index value using the phase compensation value, and determined whereby
The bit value of the 6th bit in 7 bits of the physical layer signaling code.
12. decoding apparatus as claimed in claim 11, the wherein processing module will be according to the column index value after phase compensation
The sum of the real part of corresponding element and imaginary part, the position of the 6th bit in 7 bits to determine the physical layer signaling code
Member value.
13. decoding apparatus as claimed in claim 10, wherein the processing module is configured to execute following steps:
(S1) phase compensation is carried out to the M2 symbol value using the phase compensation value, and to the M2 after phase compensation
Symbol value is descrambled to produce one first coded sequence, and using a Hadamard decoding algorithm come to first code sequence
Column carry out operation, to obtain one first decoded vector of 1 × M2 of corresponding first coded sequence；
(S2) this is determined according to a column index value of squared absolute value the maximum of all elements in first decoded vector
The bit value of the 1st to the 5th and the 7th bit in 7 bits of physical layer signaling code；And
(S3) the sum of the real part of the element according to corresponding to the column index value and imaginary part, come determine the physical layer signaling code this 7
The bit value of the 6th bit in a bit.
14. decoding apparatus as claimed in claim 9, wherein the skew estimation module is by the M1 symbol of the frame homing sequence
Symbol value adjust to first quartile, and added up to calculate a vector deviation as the phase compensation value.
15. decoding apparatus as claimed in claim 14, wherein the processing module is configured to execute following steps:
(S1) the M2 symbol value is descrambled to produce one first coded sequence, and uses a Hadamard decoding algorithm
To carry out operation to first coded sequence, to acquire one first decoded vector of 1 × M2 of corresponding first coded sequence；
(S2) this is determined according to a column index value of squared absolute value the maximum of all elements in first decoded vector
The bit value of the 1st to the 5th and the 7th bit in 7 bits of physical layer signaling code；And
(S3) plus and minus calculation is carried out to element corresponding to the column index value using the phase compensation value, and determined whereby
The bit value of the 6th bit in 7 bits of the physical layer signaling code.
16. decoding apparatus as claimed in claim 15, wherein further comprising in step (S3):
(S31) one add operation is carried out to element corresponding to the column index value using the phase compensation value respectively and one is subtracted
Method operation, and taking absolute value square to the result of the addition and the subtraction, obtain respectively whereby one first metric with
One second metric；
(S32) judge whether first metric is greater than second metric；
(S33) if first metric is greater than second metric, the in 7 bits of the physical layer signaling code is determined
The bit value of 6 bits is 0；And
(S34) if first metric is less than or equal to second metric, 7 bits of the physical layer signaling code are determined
In the 6th bit bit value be 1.
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