CN110392290A - Weakened phase restoring device and weakened phase restoring method applied to DTV broadcasting-satellite system receiving end - Google Patents
Weakened phase restoring device and weakened phase restoring method applied to DTV broadcasting-satellite system receiving end Download PDFInfo
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- CN110392290A CN110392290A CN201810343856.7A CN201810343856A CN110392290A CN 110392290 A CN110392290 A CN 110392290A CN 201810343856 A CN201810343856 A CN 201810343856A CN 110392290 A CN110392290 A CN 110392290A
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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
- H04L25/0202—Channel estimation
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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
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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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]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
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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]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
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- Computer Networks & Wireless Communication (AREA)
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- Astronomy & Astrophysics (AREA)
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Abstract
The present invention provides a weakened phase restoring device.One phase compensating circuit carries out phase compensation to N sections of given datas and N sections of unknown data according to a phase compensation signal, to generate given data and unknown data after N sections of compensation after N sections of compensation.One phase estimation circuitry generates the i-th phase estimation value according to given data after i-th section of compensation.One initial value initialization circuit generates N number of initial phase error, and the i-th initial phase error therein is related to the i-th phase estimation value, and another or multiple phase estimation values that an at least initial phase error has also been generated to phase estimation circuitry are related.The phase compensation signal is initialised according to i-th initial phase error, is applied to one i-th section of unknown data in the N sections of unknown data for the phase compensating circuit.
Description
Technical field
The present invention is related to communication system, and especially with the weakened phase restoring (phase in communication system receiving end
Recovery) technology is related.
Background technique
With the progress of mechanics of communication, digital television broadcasting is increasingly popularized.In addition to cable run and Mobile Communications base station, number
Word TV signal also can pass through artificial satellite and send.DTV satellite broadcasting (digital video broadcasting-
Satellite, DVB-S) specification is one of standard most widely employed in the current field.
The local function block diagram of the receiving end of a DTV satellite broadcasting is presented in Figure 1A, wherein converting comprising a frequency reducing
Circuit 110, an oscillator 120, a phase compensating circuit 130, a data distribution circuit 140, a phase estimation circuitry 150, with
An and phase tracking circuit 160.Oscillator 120 is responsible for generating one with reference to clock signal SR, for down-conversion circuit 110 by radio frequency
Signal yRFFrequency reducing is converted to fundamental frequency signal y.Phase compensating circuit 130, data distribution circuit 140, phase estimation circuitry 150 and phase
The work that position tracking circuit 160 is carried out is referred to as closed type weakened phase restoring (closed-loop phase recovery), purport
In the phase error found out in fundamental frequency signal y and it is compensated.If radiofrequency signal yRFCommunication environments be the white Gauss of an additivity
The channel noise (additive white Gaussian noise, AWGN), the phase error in fundamental frequency signal y is mainly by joining
Examine clock signal SRIt contributes and substantially definite value.In this case, by phase estimation circuitry 150 and phase tracking electricity
The lasting amendment on road 160, the phase error in fundamental frequency signal y can be almost completely eliminated.Illustrate that this closed type phase is returned below
The function mode for system of answering a pager's call.
It includes some data with specific content that transmission end, which can enable its output signal, for receiving end as its signal processing
Reference value in program.For DTV satellite broadcasting specification, as shown in Figure 1B, has in fundamental frequency signal y and staggeredly occur
Multistage given data and multistage unknown data；Given data is included in leading (pilot) section y1a、y2a、y3aIn, and it is unknown
Data are included in data segments y1b、y2b、y3bIn.As shown in Figure 1A, phase compensating circuit 130 is according to phase tracking circuit 160
The phase compensation signal S of offerCPhase compensation is carried out to fundamental frequency signal y, to generate signal z after a compensation.Correspondingly, it compensates
Signal z also has given data z after the multistage compensation staggeredly occurred afterwards1a、z2a、z3aWith unknown data z after multistage compensation1b、z2b、
z3b.Data distribution circuit 140 is responsible for capturing by unknown data after each section of compensation after compensation in signal z, is supplied to phase
Track circuit 160.On the other hand, data distribution circuit 140 can capture given data after each section of compensation after compensation in signal z
Out, it is supplied to phase estimation circuitry 150.
Phase estimation circuitry 150 can calculate a phase estimation value θ for given data after each section of compensationE, and these
Phase estimation value θEThe phase compensation signal S that intialization phase tracking circuit 160 exports can be sequentially used toC.By taking Figure 1B as an example,
Firstly, phase estimation circuitry 150 is by the phase estimation value θ of calculatingE_1(according to corresponding to leading section y1aCompensation after datum
According to z1aIt is produced) it is provided to phase tracking circuit 160, the phase compensation signal S to intialization phase compensation circuit 130C, supply
It is applied to data segments y1b.Then, phase tracking circuit 160 can be for corresponding to data segments y1bCompensation after unknown data
z1bA phase tracking program is imposed, the phase compensation signal S used with lasting adjustment phase place compensation circuit 130C, for being applied to number
According to section y1bIn follow-up data.
A kind of built-in function block diagram example of phase tracking circuit 160 is presented in Fig. 1 C, wherein examining comprising a phase error
Survey device 160A, loop filter 160B, a multiplexer 160C and a Numerical Control oscillator 160D.From the above, in order to
Intialization phase thermal compensation signal SC, multiplexer 160C is first by phase estimation value θE_1It is supplied to Numerical Control oscillator 160D, is supplied
Numerical Control oscillator 160D generates phase compensation signal S accordinglyC.The unknown data z after starting to receive compensation1bAfterwards, phase is missed
Difference detector 160A can continue unknown data z after calculating compensation1bIn each data phase error estimation and phase error value φ, and transfer to circuit
Filter 160B calculates its average valueStart to generate average value in loop filter 160BAfterwards, multiplexer 160C be just changed to by
Average valueIt exports and gives Numerical Control oscillator 160D, as generation phase compensation signal SCFoundation.In other words, it is applied to
Data segments y1bPhase compensation signal SCIt is first according to phase estimation value θE_1It is initialised, then further according to average value
It is constantly adjusted.Through such feedback mechanism, phase tracking circuit 160 can be tracked and reduce given data z after compensation1bIn
Phase error.
Loop filter 160B is according to unknown data z after compensation1bThe finishing touch average value of generationIt can be by multiplexer
160C is delivered to Numerical Control oscillator 160D, will be applied to leading section y to generate phase compensating circuit 1302aPhase
Thermal compensation signal SC.Similarly, phase estimation circuitry 150 is according to corresponding to leading section y2aCompensation after given data z2aIt calculates
Phase estimation value θE_2It can be provided to phase tracking circuit 160, data segments y will be applied to initialize2bPhase compensation
Signal SC.The rest may be inferred, and phase estimation circuitry 150 is according to corresponding to leading section y3aCompensation after given data z3aThe phase of calculating
Position estimated values thetaE_3It can be provided to phase tracking circuit 160, data segments y will be applied to initialize3bPhase compensation letter
Number SC。
The problem of weakened phase restoring mechanism that Figure 1A is presented, is, if signal communication environments are not the white height of simple additivity
The antenna polarization direction of this noise channel (AWGN) or receiving end is set with deviation (that is, the practical polarization side with signal
To difference), it just not only can be with referring to clock signal S in fundamental frequency signal yRThe phase error of contribution, there is also other interference sources
Caused by phase error.Antenna polarization direction is set with phase error caused by deviation possibly even can be as the time persistently changes
Become.In that case, the ability of phase tracking circuit 160 is probably not enough to track and reduce in time after each section of compensation not
Phase error in primary data.In practice, unknown data is sent to subsequent conditioning circuit and is solved after the compensation of unfinished weakened phase restoring
Code may result in the rising of decoding error rate.
Summary of the invention
To solve the above problems, the present invention proposes a kind of new weakened phase restoring device and weakened phase restoring method.
An embodiment according to the present invention is a kind of weakened phase restoring device, wherein including a phase compensating circuit, a phase
Estimating circuit, an initial value initialization circuit and a phase tracking circuit.The phase compensating circuit is to be mended according to a phase
It repays signal and phase compensation is carried out to the N section given data staggeredly occurred and N sections of unknown data, to generate corresponding N sections of compensation
Given data and unknown data after N sections of compensation afterwards, wherein N is the positive integer greater than one.The phase estimation circuitry is to root
One i-th phase estimation value is generated according to given data after one i-th section of compensation in given data after the N sections of compensation, wherein i is range
1 to the integer index between N.The initial value initialization circuit is to generate N number of initial phase error, one of them is at the beginning of i-th
Beginning phase error is related to i-th phase estimation value, and at least initial phase error in N number of initial phase error,
In addition to related to i-th phase estimation value, another or the multiple phase estimation values that have also been generated with the phase estimation circuitry
It is related.The phase compensation signal is initialised according to i-th initial phase error, is applied to the N for the phase compensating circuit
One i-th section of unknown data in section unknown data.The phase tracking circuit applies phase tracking unknown data after the N sections of compensation,
To adjust the phase compensation signal.
It is according to another embodiment of the present invention a kind of weakened phase restoring device, wherein including a phase compensating circuit, a phase
Position estimating circuit, an initial value initialization circuit, a phase tracking circuit and a decision circuitry.In addition to above-mentioned circuit, this is sentenced
Deenergizing judges whether the weakened phase restoring device is in an additivity white Gauss noise communication link according to N number of phase estimation value
Border.
According to another embodiment of the present invention it is a kind of weakened phase restoring method, is applied to a DTV broadcasting-satellite system
A receiving end.One receives the N section given data and N sections of unknown data that signal includes staggeredly appearance, and wherein N is one greater than one
Positive integer, i are range 1 to the integer index between N.The weakened phase restoring method includes: (a) according to a phase compensation signal pair
One i-th section of given data in the N sections of given data carries out phase compensation, to generate given data after one i-th section of compensation；(b)
One i-th phase estimation value is generated according to given data after this i-th section compensation；(c) it generates and i-th phase estimation value relevant one
I-th initial phase error, and at least initial phase error in N number of initial phase error, in addition to i-th phase estimation
Value is related, also related to another generated or multiple phase estimation values；(d) initial according to i-th initial phase error
Change the phase compensation signal for being applied to one i-th section of unknown data in the N sections of unknown data；(e) according to the phase compensation signal
Phase compensation is carried out to i-th section of unknown data, to generate unknown data after one i-th section of compensation；And (f) this i-th section is mended
It repays rear unknown data and imposes a phase tracking program, to adjust the phase compensation signal.
It is according to another embodiment of the present invention a kind of weakened phase restoring method, other than above-mentioned steps (a)~(f), also
Judge whether a communication environment is an additivity white Gauss noise communication environment according to N number of phase estimation value including (g).
It can be further understood by following detailed description of the invention and appended attached drawing about the advantages and spirit of the present invention.
Detailed description of the invention
For the above objects, features and advantages of the present invention can be clearer and more comprehensible, below in conjunction with attached drawing to tool of the invention
Body embodiment elaborates, in which:
The local function block diagram of the receiving end of a DTV satellite broadcasting is presented in Figure 1A.
Figure 1B is the data structure schematic diagram of a fundamental frequency signal.
The built-in function block diagram of a phase tracking circuit is presented in Fig. 1 C.
Fig. 2 is the functional block diagram according to the weakened phase restoring device in one embodiment of the invention.
The embodiment of initial value initialization circuit according to the present invention is presented in Fig. 3.
Fig. 4 is the functional block diagram according to the weakened phase restoring device in another embodiment of the present invention.
Fig. 5 is the flow chart according to the weakened phase restoring method in one embodiment of the invention.
It should be noted that attached drawing of the invention includes the functional block diagram that a variety of functional modules associated with each other are presented.
These attached drawings are not thin portion circuit diagram, and connecting line therein is only to indicate signal stream.Between functional element and/or program
A variety of interactive relationship are not necessarily intended to reach through the direct electrical connection beginning.In addition, the function of individual component be not necessarily intended to as
The mode being painted in attached drawing is distributed, and distributed block is not necessarily intended to the realization of distributed electronic component.
Component label instructions are as follows in figure:
110: down-conversion circuit 120: oscillator
130: phase compensating circuit 140: data distribution circuit
150: phase estimation circuitry 160: phase tracking circuit
160A: phase error detector 160B: loop filter
160C: multiplexer 160D: Numerical Control oscillator
yRF: radiofrequency signal y: fundamental frequency signal
y1a、y2a、y3a: leading section y1b、y2b、y3b: data segments
SR: refer to clock signal z: signal after compensation
z1a、z2a、z3a: given data z after compensation1b、z2b、z3b: unknown data after compensation
SC: phase compensation signal θE: phase estimation value
φ: phase error estimation and phase error valueAverage value
200: weakened phase restoring device 210: phase compensating circuit
220: data distribution circuit 230: phase estimation circuitry
240: initial value initialization circuit 240A: mean value calculation circuit
240B: comparison circuit 240C: subtraction circuit
240D: multiplexer 240E: control circuit
250: phase tracking circuit 260: decision circuitry
θINI: initial phase error E [θE]: average value
TH: threshold value S501~S506: process step
Specific embodiment
An embodiment according to the present invention is a kind of weakened phase restoring device, and functional block diagram is depicted in Fig. 2.Phase is returned
Apparatus for coating 200 is set comprising a phase compensating circuit 210, a data distribution circuit 220, a phase estimation circuitry 230, an initial value
Determine circuit 240 and a phase tracking circuit 250.The function and function mode of each circuit introduced below.
Phase compensating circuit 210 is to according to phase compensation signal SCSignal y, which is received, to one carries out phase compensation.It receives
Include the N section given data staggeredly occurred and N sections of unknown data (N is the positive integer greater than one), each section of unknown number in signal y
According to there is one section of given data before.In practice, these given datas are possibly comprised in the leading section or reality received in signal y
In body layer header (header).Correspondingly, phase compensating circuit 210 generate compensation after signal z include N section compensate after
Primary data and unknown data after N sections of compensation.
Data distribution circuit 220 is responsible for (such as the benefit in Figure 1B of given data after each section in signal z compensation after compensation
Repay rear given data z1a、z2a、z3a) capture and come, be supplied to phase estimation circuitry 230, and by each section after compensation in signal z
Unknown data after compensation (such as unknown data z after the compensation in Figure 1B1b、z2b、z3b) capture, be supplied to phase tracking electricity
Road 250.
Indicate range 1 to the integer index between N with symbol i.The work of phase estimation circuitry 230 is mended according to N sections
Given data generates one i-th phase estimation value θ after repaying i-th section of compensation in rear given dataE_i.In more detail, phase estimation
Circuit 230 is to carry out operation according to the original contents of given data and receiving end given data after i-th section of compensation to generate phase
Estimated values thetaE_i.According to maximum likelihood (maximum-likelihood) estimation technique, the calculating work of phase estimation circuitry 230
It is represented by following arithmetic expression:
Wherein symbol arg, which is represented, calculates argument, and symbol Im, which is represented, calculates imaginary part, and symbol Re, which is represented, calculates real part, symbol L generation
Given data z after i-th section of table compensationiaLength, symbol j be range 1 to an integer index between L, symbol zia_jGeneration
Given data z after the compensation of the table sectioniaIn jth data, symbolRepresent jth data in given data original contents
Conjugated signal.
For integer index i=1~N, phase tracking circuit 250 can be according to one i-th initial phase error θINI_iInitialization
Phase compensating circuit 210 is applied to the phase compensation signal S of i-th section of unknown data in N sections of unknown dataC, and for corresponding
I-th section compensation after unknown data impose phase tracking program, be applied to i-th section not with lasting adjustment phase place compensation circuit 210
The phase compensation signal S of primary dataC.It should be noted that the detailed embodiment of phase tracking program is technology belonging to the present invention
In field known to those of ordinary skill, do not repeated in this.As it was earlier mentioned, when weakened phase restoring device 200 is white in additivity
Gaussian noise (AWGN) communication environment, as long as the i-th phase estimation value θ that phase estimation circuitry 230 is found outE_iIt is set as at the beginning of i-th
Beginning phase error thetaINI_i, phase tracking circuit 250 just can persistently correct and the phase error substantially after elimination compensation in signal z.
However, when weakened phase restoring device 200 is not at additivity white Gauss noise communication environment, this initial value setting means may
Phase error after allowing phase tracking circuit 250 that can not successfully eliminate compensation in signal z.Initial value initialization circuit 240 is
It is arranged to solve the above-mentioned problems.For integer index i=1~N, initial value initialization circuit 240 can be according to phase estimation electricity
The i-th phase estimation value θ that road 230 generatesE_iGenerate the i-th initial phase error θINI_i.Different from Figure 1A by the i-th phase estimation
Value θE_iDirectly it is set as the i-th initial phase error θINI_iPrior art, in the present embodiment of the invention, generate at the beginning of at least one
When beginning phase error, multiple phase estimation value θ that initial value initialization circuit 240 has generated phase estimation circuitry 230EIt is included in and examines
Consider.Several specific embodiments introduced below.
In an embodiment, for integer index i=P, 2P, 3P ..., m*P, initial value initialization circuit 240 generate i-th
Initial phase error θINI_i(i-P+1) the phase estimation value θ for being and having generatedE_(i-P+1)To the i-th phase estimation value θE_iIt is related；
The the i-th initial phase error θ generated for other integers index i, initial value initialization circuit 240INI_iIt is and the i-th phase estimation value
θE_iCorrelation, wherein symbol P represents the specific positive integer between 2 and N, and symbol m is N divided by the resulting quotient of P.With number
Value N is equal to 30, numerical value P and is equal to for ten, and numerical value m is equal to three.For example, for preceding nine initial phases in every ten
Error thetaINI_X (i=1~9,11~19,21~29), initial value initialization circuit 240 use the i-th phase estimation value θE_iAs i-th
Initial phase error θINI_i, for example, by using the 9th phase estimation value as the 9th initial phase error；Specifically, for every ten
The tenth initial phase error θ in aINI_i(i=10,20,30), 240 fixed phase estimating circuit of initial value initialization circuit
The 230 newest ten phase estimation value θ generatedEFurther to generate the tenth initial phase error, rather than directly adopt the i-th phase
Position estimated values thetaE_iAs the tenth initial phase error θINI_i(i=10,20,30).In more detail, the tenth is being generated initially
Phase error thetaINI_10When, initial value initialization circuit 240 can be by phase estimation value θE_1、θE_2、θE_3、…、θE_10All account for；
Generating the 20th initial phase error θINI_20When, initial value initialization circuit 240 can be by phase estimation value θE_11、θE_12、
θE_13、…、θE_20All account for；Generating the 30th initial phase error θINI_30When, initial value initialization circuit 240 can incite somebody to action
Phase estimation value θE_21、θE_22、θE_23、…、θE_30All account for.
A kind of example that the initial value initialization circuit 240 of above-mentioned concept can be achieved is presented in Fig. 3, wherein including an average value meter
Calculate circuit 240A, a comparison circuit 240B, a subtraction circuit 240C, a multiplexer 240D and a control circuit 240E.For
Integer index i=1~9,11~19,21~29, control circuit 240E can control the direct output phase estimated value of multiplexer 240D
θE_i, as the initial phase error θ for being supplied to phase tracking circuit 250INI_i.On the other hand, for integer index i=10,
20,30, control circuit 240E can determine that multiplexer 240D should export subtraction according to the comparison result that comparison circuit 240B is generated
The output signal (estimated value after hereinafter referred to as one amendment) or phase estimation value θ of circuit 240CE_i.As shown in figure 3, the amendment
Estimated value is subtraction circuit 240C from phase estimation value θ afterwardsE_iSubtract an average value E [θE] calculated result.In this embodiment
In, mean value calculation circuit 240A can be with ten phase estimation value θE_iFor unit, adds up and calculate its average value E [θE].Compare
Circuit 240B is responsible for comparing average value E [θE] with the size of a preset threshold value TH.If comparison circuit 240B determines phase
Estimated values thetaE_1、θE_2、θE_3、…、θE_10Average value E [θE]1~10Higher than threshold value TH, control circuit 240E will control multiplexing
Estimated value (θ after device 240D output amendmentE_10-E[θE]1~10), as initial phase error θINI_10.Relatively, if average value E
[θE]1~10Not higher than threshold value TH, then control circuit 240E can control multiplexer 240D output phase estimated values thetaE_10, as first
Beginning phase error thetaINI_10.The rest may be inferred, initial phase error θINI_20It may be estimated value (θ after correctingE_20-E[θE]11~20) or
Phase estimation value θE_20, initial phase error θINI_30It may be estimated value (θ after correctingE_30-E[θE]21~30) or phase estimation value
θE_30。
Initial value initialization circuit 240 is by multiple phase estimation value θEThe reason of accounting for is, by multiple phase estimations
Value θEStatistical property weakened phase restoring device 200 can be found out whether in additivity white Gauss noise communication environment.For example,
If weakened phase restoring device 200 is to be in additivity white Gauss noise communication environment, the phase error in reception signal y is substantially
Definite value, thus after the compensation of several wheels of phase estimation circuitry 230 and phase tracking circuit 250 and tracking, believe after compensation
Phase error in number z will be eliminated substantially, and then make each average value E [θE] close to zero.Relatively, if phase is returned
Apparatus for coating 200 is in non-addivitity white Gauss noise communication environment, average value E [θE] predetermined threshold level TH may be higher than,
And average value E [θE] size can reflect other interference source contributions phase error size.That is, average value E [θE]
It can be considered as phase error offset (bias) as caused by other interference sources.Therefore, as average value E [θE]1~10Higher than default
Threshold value TH, multiplexer 240D are estimated value (θ after output amendmentE_10-E[θE]1~10) as initial phase error θINI_10, whereby
Remove the phase error offset.
In another embodiment, for integer index i=1~(P-1), the i-th of the generation of initial value initialization circuit 240 is initial
Phase error thetaINI_iIt is and the i-th phase estimation value θE_iIt is related；For integer index i=P~N, initial value initialization circuit 240 is produced
The i-th raw initial phase error θINI_iThe first phase estimated values theta for being and having generatedE_1To the i-th phase estimation value θE_iCorrelation,
Middle symbol P represents the specific positive integer between 2 and N.By taking numerical value of N is equal to 30, numerical value P equal to ten as an example.For example,
For preceding nine initial phase error θINI_i(i=1~9), initial value initialization circuit 240 use the i-th phase estimation value θE_iAs
I-th initial phase error θINI_i；For the tenth to the 30th initial phase error θINI_i(i=10~30), initial value is set
Determining circuit 240 then is all phase estimation value θ that will have been generated at presentEAll account for.More specifically, initial value is set
Circuit 240 is in the tenth initial phase error θ of generationINI_10When can be by first phase estimated values thetaE_1To the tenth phase estimation value
θE_10It accounts for, in the 11st initial phase error θ of generationINI_11When can be by first phase estimated values thetaE_1To the 11st phase
Position estimated values thetaE_11It accounts for, and so on.
In another embodiment, for integer index i=1~(P-1), the i-th of the generation of initial value initialization circuit 240 is initial
Phase error thetaINI_iWith the i-th phase estimation value θE_iIt is related；For integer index i=P~N, initial value initialization circuit 240 is generated
The i-th initial phase error θINI_iWith (i-P+1) phase estimation value θE_(i-P+1)To the i-th phase estimation value θE_iCorrelation, wherein
Symbol P represents the specific positive integer between 2 and N.By taking numerical value of N is equal to 30, numerical value P equal to ten as an example.For example, needle
To preceding nine initial phase error θINI_i(i=1~9), initial value initialization circuit 240 use the i-th phase estimation value θE_iAs
I initial phase error θINI_i；For the tenth to the 30th initial phase error θINI_i(i=10~30), initial value setting
Circuit 240 is then by generation time closest to the i-th phase estimation value θE_iTen phase estimation value (θE_(i-10+1)~θE_i) receive
Enter to consider.More specifically, initial value initialization circuit 240 is in the tenth initial phase error θ of generationINI_10When can be by the first phase
Position estimated values thetaE_1To the tenth phase estimation value θE_10It accounts for, in the 11st initial phase error θ of generationINI_11When can will
Second phase estimated values thetaE_2To the 11st phase estimation value θE_11It accounts for, and so on.
Persons of ordinary skill in the technical field of the present invention is it is understood that several numerical value settings described above can reach
To the effect for eliminating phase error offset, and separately, there are many setting change types for realizing concept of the present invention.
On the other hand, the predetermined threshold level TH that aforementioned comparison circuit 240B is used can be by circuit designers according to practical experience
Or simulated experiment determines, is not limited with special value.It can if threshold value TH is set as the comparison circuit 240B in zero, Fig. 3
It is omitted.In such an embodiment, control circuit 240E be (that is, should be for which is whole according to preset operational logic
Estimated value (θ after number index i output amendmentE-E[θE])) control multiplexer 240D.In practice, initial value initialization circuit 240 can
It is realized using various control and processing platform, includes fixed and programmable logic circuit, such as programmable logic gate array
Column, the integrated circuit for specific application, microcontroller, microprocessor, digital signal processor.In addition, initial value setting electricity
Road 240 is designed to by executing processor instruction stored in a memory (not being painted), to complete its task.
It is according to another embodiment of the present invention a kind of weakened phase restoring device, functional block diagram is depicted in Fig. 4.In addition to
210~phase tracking of phase compensating circuit circuit 250 in Fig. 2, weakened phase restoring device 400 further includes a decision circuitry
260.As it was earlier mentioned, by multiple phase estimation value θEStatistical property can find out whether a weakened phase restoring device is in additivity
White Gauss noise communication environment.Decision circuitry 260 is N number of phase estimation value to be generated according to phase estimation circuitry 230
θEJudge weakened phase restoring device 400 whether in additivity white Gauss noise (AWGN) communication environment.Decision circuitry 260 is sentenced
Disconnected result can provide other circuit references in affiliated receiving end, such as decide whether to answer adjustment signal processing routine accordingly
Setting.That is, M signal (the phase estimation value that weakened phase restoring device 400 generates during carrying out weakened phase restoring
θE) can be further employed.It should be noted that no matter which the initial value initialization circuit 240 in weakened phase restoring device 400 uses
Kind initial value sets mechanism, all will not influence the judging result of decision circuitry 260.
It is according to another embodiment of the present invention a kind of weakened phase restoring method, flow chart is as shown in Figure 5.This weakened phase restoring
Method is applied to the N section given data and N sections of unknown data staggeredly occurred, and wherein N is the positive integer greater than one, and i is model
1 is trapped among to the integer index between N.Step S501~step S506 can be sequentially applied to each integer index i.Firstly, step
Rapid S501 is to carry out phase compensation to one i-th section of given data in the N sections of given data according to a phase compensation signal, to produce
Given data after raw one i-th section of compensation.Given data generates one i-th phase estimation after this i-th section compensation according to step S502
Value.I-th phase estimation value generates one i-th initial phase error according to step S503, and will selectively generate
Multiple phase estimation values account for.I-th initial phase error initialization is applied to the N sections of unknown number according to step S504
Phase compensation signal of one i-th section of unknown data in.The phase compensation signal is unknown to this i-th section according to step S505
Data carry out phase compensation, to generate unknown data after one i-th section of compensation.Step S506 is to unknown number after this i-th section compensation
According to a phase tracking program is imposed, to adjust the phase compensation signal for being applied to i-th section of unknown data.
Persons of ordinary skill in the technical field of the present invention was it is understood that previously introducing weakened phase restoring device 200,400
When the various operation changes that describe can also be applied to the weakened phase restoring method in Fig. 5, details repeats no more.
By the detailed description of embodiments above, it is intended to more clearly describe feature and spirit of the invention, and simultaneously
It is non-that scope of the invention is limited with above-mentioned disclosed specific embodiment.On the contrary, the purpose is to wish to cover
Various changes and tool equality are arranged in the scope of the scope of the patents to be applied of the invention.In addition, in this exposure book
Mathematical representation be to illustrate principle relevant to the embodiment of the present invention and logic, it is no the case where unless there are specializing
Scope of the invention is not construed as limiting then.Persons of ordinary skill in the technical field of the present invention is it is understood that there are many technologies
Physical manifestation corresponding to these mathematical expressions can be achieved.
Although the present invention is disclosed as above with preferred embodiment, however, it is not to limit the invention, any this field skill
Art personnel, without departing from the spirit and scope of the present invention, when can make a little modification and perfect therefore of the invention protection model
It encloses to work as and subject to the definition of the claims.
Claims (11)
1. a kind of weakened phase restoring device, applied to a receiving end of a DTV broadcasting-satellite system, the weakened phase restoring device
Include:
One phase compensating circuit receives signal to one according to a phase compensation signal and carries out phase compensation, which includes
The N section given data that staggeredly occurs and N section unknown data, with generate after corresponding N section compensation given data and N sections compensate after
Unknown data, wherein N is the positive integer greater than one；
One phase estimation circuitry generates one i-th according to given data after one i-th section of compensation in given data after the N sections of compensation
Phase estimation value, wherein i is an integer index, i=1~N；
One initial value initialization circuit, generates N number of initial phase error, and one i-th initial phase error therein is and i-th phase
Estimated value is related, and at least initial phase error in N number of initial phase error, in addition to the i-th phase estimation value phase
It closes, another or the multiple phase estimation values also generated to the phase estimation circuitry is related, wherein the phase compensation signal
It is to be initialised according to i-th initial phase error, is applied in the N sections of unknown data one i-th section for the phase compensating circuit
Unknown data；And
One phase tracking circuit applies phase tracking unknown data after the N sections of compensation, to adjust the phase compensation signal.
2. weakened phase restoring device as described in claim 1, which is characterized in that be directed to integer index i=1~(P-1), this is initial
I-th initial phase error that value initialization circuit generates is related to i-th phase estimation value；For integer index i=P~N,
I-th initial phase error that the initial value initialization circuit generates is (i-P+1) phase generated with the phase estimation circuitry
For position estimated value to the i-th phase estimation value correlation, P is the specific positive integer between 2 and N.
3. weakened phase restoring device as described in claim 1, which is characterized in that be directed to integer index i=1~(P-1), this is initial
I-th initial phase error that value initialization circuit generates is related to i-th phase estimation value；For integer index i=P~N,
I-th initial phase error that the initial value initialization circuit generates is the first phase estimation generated with the phase estimation circuitry
For value to the i-th phase estimation value correlation, P is the specific positive integer between 2 and N.
4. weakened phase restoring device as described in claim 1, which is characterized in that for integer index i=P, 2P, 3P ..., m*P,
I-th initial phase error that the initial value initialization circuit generates is (i-P+1) phase generated with the phase estimation circuitry
Position estimated value is related to the i-th phase estimation value；For other integers index i, the initial value initialization circuit generate this is i-th initial
Phase error be it is related to i-th phase estimation value, P is a specific positive integer between 2 and N, and m is N divided by the resulting quotient of P
Number.
5. weakened phase restoring device as described in claim 1, which is characterized in that the spy that wherein the initial value initialization circuit generates
It is related to the P phase estimation value that the phase estimation circuitry has generated to determine initial phase error, and P is specific for one between 2 and N
Positive integer, which includes:
One mean value calculation circuit, to calculate an average value of the P phase estimation value generated；
One comparison circuit, to compare the average value and a threshold value；
One subtraction circuit, to subtract the average value from the particular phases estimated value for corresponding to the specific initial phase error,
To generate estimated value after an amendment；And
One multiplexer, if the average value is higher than the threshold value, which selects estimated value after the amendment specific initial as this
Phase error；If the average value, not higher than the threshold value, which selects the particular phases estimated value specific initial as this
Phase error.
6. a kind of weakened phase restoring method, applied to a receiving end of a DTV broadcasting-satellite system, a reception signal includes
The N section given data staggeredly occurred and N sections of unknown data, wherein N is the positive integer greater than one, and i is for range 1 between N
One integer index, which includes:
(a) phase compensation is carried out to one i-th section of given data in the N sections of given data according to a phase compensation signal, to produce
Given data after raw one i-th section of compensation；
(b) one i-th phase estimation value is generated according to given data after this i-th section compensation；
(c) one i-th initial phase error relevant to i-th phase estimation value is generated, and in N number of initial phase error extremely
A few initial phase error, in addition to related to i-th phase estimation value, also with another generated or multiple phase estimations
Value is related；
(d) phase of one i-th section of unknown data in the N sections of unknown data is applied to according to i-th initial phase error initialization
Position thermal compensation signal；
(e) phase compensation is carried out to i-th section of unknown data according to the phase compensation signal, after compensating with one i-th section of generation not
Primary data；And
(f) a phase tracking program is imposed to unknown data after this i-th section compensation, to adjust the phase compensation signal.
7. weakened phase restoring method as claimed in claim 6, which is characterized in that step (c) includes:
For integer index i=1~(P-1), enable i-th initial phase error related to i-th phase estimation value, P is between 2
And the specific positive integer between N；And
For integer index i=P~N, i-th initial phase error and (i-P+1) phase estimation value that has generated to i-th are enabled
Phase estimation value is related.
8. weakened phase restoring method as claimed in claim 6, which is characterized in that step (c) includes:
For integer index i=1~(P-1), enable i-th initial phase error related to i-th phase estimation value, P is between 2
And the specific positive integer between N；And
For integer index i=P~N, i-th initial phase error and the first phase estimated value that has generated to the i-th phase are enabled
Estimated value is related.
9. weakened phase restoring method as claimed in claim 6, which is characterized in that step (c) includes:
For integer index i=P, 2P, 3P ..., m*P, enable i-th initial phase error and (i-P+1) phase for having generated
For estimated value to the i-th phase estimation value correlation, P is the specific positive integer between 2 and N, and m is N divided by the resulting quotient of P；With
And
For other integers index i, enable i-th initial phase error related to i-th phase estimation value.
10. weakened phase restoring method as claimed in claim 6, which is characterized in that step (c) includes:
When generating a specific initial phase error, calculate the average value of P phase estimation value generated, P between 2 and
A specific positive integer between N；
Compare the average value and a threshold value；
The average value is subtracted from the particular phases estimated value for corresponding to the specific initial phase error, to estimate after one amendment of generation
Evaluation；
If the average value is higher than the threshold value, estimated value is as the specific initial phase error after selecting the amendment；And
If the average value not higher than the threshold value, selects the particular phases estimated value as the specific initial phase error.
11. a kind of weakened phase restoring method, applied to the N section given data and N sections of unknown data staggeredly occurred, wherein N for greater than
One positive integer, i be range 1 to the integer index between N, which includes:
(a) phase compensation is carried out to one i-th section of given data in the N sections of given data according to a phase compensation signal, to produce
Given data after raw one i-th section of compensation；
(b) one i-th phase estimation value is generated according to given data after this i-th section compensation；
(c) one i-th initial phase error is generated according to i-th phase estimation value；
(d) phase of one i-th section of unknown data in the N sections of unknown data is applied to according to i-th initial phase error initialization
Position thermal compensation signal；
(e) phase compensation is carried out to i-th section of unknown data according to the phase compensation signal, after compensating with one i-th section of generation not
Primary data；
(f) a phase tracking program is imposed to unknown data after this i-th section compensation, which is applied to adjustment
The phase compensation signal；And
(g) judge whether a communication environment is an additivity white Gauss noise communication environment according to N number of phase estimation value.
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