CN109547375A - A kind of parallel carriers restoration methods, device and terminal device - Google Patents
A kind of parallel carriers restoration methods, device and terminal device Download PDFInfo
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- CN109547375A CN109547375A CN201811434950.XA CN201811434950A CN109547375A CN 109547375 A CN109547375 A CN 109547375A CN 201811434950 A CN201811434950 A CN 201811434950A CN 109547375 A CN109547375 A CN 109547375A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0044—Control loops for carrier regulation
- H04L2027/0063—Elements of loops
- H04L2027/0069—Loop filters
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Abstract
The present invention is suitable for field of communication technology, provides a kind of parallel carriers restoration methods, device and terminal device, including the road N parallel carriers data are coordinately transformed, and obtains the polar data of the road N parallel carriers data；Polar data is inputted into phase frequency detector to obtain the error term of each road parallel carriers data；The error term of each road parallel carriers data is averaged, the phase error of the road N parallel carriers data is obtained；Phase error is inputted into loop filter and digital controlled oscillator carries out phase compensation, the compensated sync carrier data of output phase.The frequency deviation and skew of parallel carriers data are captured by phase frequency detector, and it is averaged by the error term to multidiameter delay carrier data to eliminate carrier deviation, phase compensation is carried out by loop filter and digital controlled oscillator again, the sync carrier data that and phase difference consistent with the road N parallel carriers data frequency is steady state value are obtained, realize carrier auxiliary.
Description
Technical field
The invention belongs to field of communication technology more particularly to a kind of parallel carriers restoration methods, device and terminal device.
Background technique
In modern digital communication systems, for common carrier suppressed modulation technology such as M member quadrature amplitude modulation (M-
Ary quadrature amplitude modulation, M-QAM), M member phase-shift keying (M-ary phase-shift
Keying, M-PSK) etc., generally coherent demodulation is used to obtain better error performance.Coherent demodulation requires to restore in receiving end
Coherent carrier reaches the local oscillator clock of transmitting terminal and receiving end with the same phase of frequency, and is precisely compensated for, this makes sending and receiving end
Carrier wave is exactly completely carrier synchronization or referred to as carrier auxiliary with the process of phase with frequency.
THz wave (Terahertz, 1THz=1012Hz) refers to frequency in 0.1~10THz wave band (corresponding wavelength 30
~3000 μm) electromagnetic wave in range, between infrared between microwave.Since THz wave is in the special bit of electromagnetic spectrum
It sets, making its own includes spectral information abundant, and has good spectrally resolved characteristic, to many dielectric materials and nonpolarity
Liquid has good penetrability.Therefore, THz wave can be used as means of communication and carry out under the adverse circumstances such as smog, sand and dust
Communication work.The performance quality high degree of THz communication technology depends on the data-handling capacity of communications baseband link, because
There was only the base band processing capacity of high speed, the advantages of Terahertz frequency spectrum, could adequately be utilized, and at the base band of high speed
Reason ability premise is exactly the modem with high speed, and carries out carrier recovery algorithm by modem.
And the carrier recovery algorithm of modem is easy to appear carrier deviation at present, carrier deviation can not only reduce letter
Number power, can also cause interactive interference between inphase quadrature component, cause carrier auxiliary effect poor, to influence modulatedemodulate
The performance of device is adjusted, and then influences base band processing capacity, the decline of Terahertz communication system performance is eventually led to, even results in Terahertz
Communication system can not communicate.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of parallel carriers restoration methods, system and terminal device, to solve
The carrier recovery algorithm of modem is easy to appear carrier deviation at present, influences the performance of modem, leads to Terahertz
The problem of communication system performance declines.
The first aspect of the present invention provides a kind of parallel carriers restoration methods, comprising:
The road N parallel carriers data are coordinately transformed, the polar data of the road the N parallel carriers data is obtained；Its
In, N >=1 and N are integer；
The polar data is inputted into phase frequency detector to obtain the error term of each road parallel carriers data；
The error term of each road parallel carriers data is averaged, the phase error letter of parallel carriers data is obtained
Number；
The phase error signal is inputted into loop filter and digital controlled oscillator carries out phase compensation, output phase compensation
Sync carrier data afterwards.
The second aspect of the present invention provides a kind of parallel carriers recovery device, comprising:
Coordinate transformation module obtains the road the N parallel carriers number for being coordinately transformed the road N parallel carriers data
According to polar data；Wherein, N >=1 and N are integer；
Frequency and phase discrimination module, for the polar data to be inputted phase frequency detector to obtain each road parallel carriers data
Error term；
Error calculating module obtains parallel carriers for the error term of each road parallel carriers data to be averaged
The phase error signal of data；
Synchronization module, for the phase error signal to be inputted loop filter and digital controlled oscillator progress phase benefit
It repays, the compensated sync carrier data of output phase.
The third aspect of the present invention provides a kind of terminal device, including memory, processor and is stored in described deposit
In reservoir and the computer program that can run on the processor, the processor realized when executing the computer program with
Lower step:
The road N parallel carriers data are coordinately transformed, the polar data of the road the N parallel carriers data is obtained；Its
In, N >=1 and N are integer；
The polar data is inputted into phase frequency detector to obtain the error term of each road parallel carriers data；
The error term of each road parallel carriers data is averaged, the phase error letter of parallel carriers data is obtained
Number；
The phase error signal is inputted into loop filter and digital controlled oscillator carries out phase compensation, output phase compensation
Sync carrier data afterwards.
The fourth aspect of the present invention provides a kind of computer readable storage medium, and the computer readable storage medium is deposited
Computer program is contained, the computer program performs the steps of when being executed by processor
The road N parallel carriers data are coordinately transformed, the polar data of the road the N parallel carriers data is obtained；Its
In, N >=1 and N are integer；
The polar data is inputted into phase frequency detector to obtain the error term of each road parallel carriers data；
The error term of each road parallel carriers data is averaged, the phase error letter of parallel carriers data is obtained
Number；
The phase error signal is inputted into loop filter and digital controlled oscillator carries out phase compensation, output phase compensation
Sync carrier data afterwards.
A kind of parallel carriers restoration methods, system and terminal device provided by the invention, simultaneously by phase frequency detector capture
The frequency deviation and skew of row carrier data, and be averaged by the error term to multidiameter delay carrier data inclined to eliminate carrier wave
Difference, then phase compensation is carried out by loop filter and digital controlled oscillator, obtain it is consistent with the road N parallel carriers data frequency and
Phase difference is the sync carrier data of steady state value, realizes that carrier auxiliary, the carrier wave for efficiently solving current modem are extensive
The problem of double calculation method is easy to appear carrier deviation, influences the performance of modem, and Terahertz communication system performance is caused to decline.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is a kind of implementation process schematic diagram for parallel carriers restoration methods that the embodiment of the present invention one provides；
Fig. 2 is the realization structural framing schematic diagram that the present invention implements a kind of parallel carriers restoration methods that one provides
Fig. 3 is the implementation process schematic diagram of one step S104 of corresponding embodiment provided by Embodiment 2 of the present invention；
Fig. 4 is a kind of structural schematic diagram for parallel carriers recovery device that the embodiment of the present invention three provides；
Fig. 5 is the structural schematic diagram of synchronization module 104 in the corresponding embodiment three of the offer of the embodiment of the present invention four；
Fig. 6 is the schematic diagram for the terminal device that the embodiment of the present invention five provides.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, system, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
Embodiment one:
As shown in Figure 1, a kind of parallel carriers restoration methods are present embodiments provided, the modulation applied to digital communication system
In demodulator, its carrier auxiliary is realized, above-mentioned parallel carriers restoration methods specifically include:
Step S101: the road N parallel carriers data are coordinately transformed, and the pole for obtaining the road the N parallel carriers data is sat
Mark data；Wherein, N >=1 and N are integer.
In a particular application, since the road the N parallel carriers data of input are to be provided with Cartesian form, and carrying out
Capturing carrier, tracking, filtering and compensation etc. are real in planisphere with the polar form of the road N parallel carriers data when operating
Existing, intuitively to indicate the relationship between signal and signal.Therefore, first the road N parallel carriers data are coordinately transformed,
The road N parallel carriers data are transformed into polar coordinate system from rectangular coordinate system, obtain the polar coordinates number of the road N parallel carriers data
According to.It should be noted that planisphere refers to the distribution map of signal phasor endpoint.
In a particular application, pass through Coordinate Rotation Digital algorithm (Coordinate Rotation Digital
Computer, CORDIC) by the rectangular coordinates transformation of the road the N parallel carriers data be polar coordinates, obtain the road N and carry parallel
The polar data of wave number evidence.It should be noted that cordic algorithm is to realize that right angle is sat by angle rotation and shifter-adder
The algorithm that mark system and polar coordinate system are converted, its implementation are not repeated here herein as the prior art.
In one embodiment, N=8,8 road parallel carriers data pass through cordic algorithm for its rectangular coordinates transformation to pole
Coordinate, it is subsequent to the operation such as capturing carrier, tracking, filtering and compensation of 8 road parallel carriers data to carry out.
Step S102: the polar data is inputted into phase frequency detector to obtain the error of each road parallel carriers data
?.
In a particular application, after being coordinately transformed to parallel carriers data, the polar coordinates number of parallel carriers data is obtained
According to being inputted in the phase frequency detector of specific frequency and phase discrimination function, to obtain the error term of each road parallel carriers data.
In a particular application, the estimation of frequency deviation skew is carried out to parallel carriers data by phase frequency detector, exports phase demodulation knot
Fruit, and identified result is based on by the phase discriminator of the phase frequency detector and extracts phase error, get each road parallel carriers data
Error term.
In a particular application, in order to increase the frequency-tracking range of carrier auxiliary, play the role of synchronization frequency modulation phase modulation, on
The extraction that phase frequency detector carries out phase error by PFD algorithm is stated, then after extracting phase error, is obtained based on phase error each
The error term of road parallel carriers data.PFD algorithm passes through the zero crossing of detection carrier phase, only by the PD detected value after zero crossing
It exports to loop filter, and keeps this detected value to the arrival of next zero crossing, specifically, being arranged one to constellation point
Window is considered as the carrier data error in zero crossings, extracts phase error with PD algorithm if signal is fallen in window,
Otherwise it is maintained for last detected value.
In one embodiment, the model of above-mentioned phase frequency detector is as follows:
Wherein, ekFor phase frequency detector output error term,For the skew estimation of phase frequency detector output, λ is frequency discrimination
The adjusting error threshold of phase discriminator, ckFor the polar data of output, θ is the set of cornerwise constellation point of planisphere.It needs
It is noted that adjusting error threshold parameter lambda can be set according to practical application, in the present embodiment, above-mentioned adjusting is missed
Poor threshold parameter λ is 0.1 π.
In one embodiment, in order to enable the above-mentioned phase frequency detector based on PFD algorithm can be realized all phase carrier wave
It is synchronous, the rectangular window frequency discriminator of existing PFD algorithm is replaced with into annular window frequency discriminator.It should be noted that annular window frequency discrimination
Existing annular window frequency discriminator can be used to realize in device.
Step S103: the error term of each road parallel carriers data is averaged, the phase of parallel carriers data is obtained
Bit error signal.
In a particular application, it is contemplated that the rotation compensation of carrier deviation can be realized directly by phase field subtraction, because
This is by the way of parallel data input, then by the error term averaged of the parallel carriers data of output, by the average value
As identified result (phase error), to eliminate carrier deviation.
In a particular application, the above-mentioned error term by each road parallel carriers data is averaged, and obtains parallel carriers
The model of the phase error signal of data is as follows:
Wherein, eavgFor the phase error of parallel carriers data, ekiFor the error term of jth road parallel carriers data output.
Step S104: inputting loop filter for the phase error signal and digital controlled oscillator carry out phase compensation, defeated
Sync carrier data after phase compensation out.
In a particular application, phase error is inputted in loop filter after being filtered and is used to drive digital controlled oscillator work
Make, by output after digital controlled oscillator progress phase compensation, consistent and phase difference is constant with the frequency of the road N parallel carriers data
The sync carrier data of value.
For the ease of more clearly explaining parallel carriers restoration methods provided in this embodiment, in conjunction with Fig. 2 to the present embodiment
The working principle of the parallel carriers restoration methods of offer is described as follows:
As shown in Fig. 2, Fig. 2 shows this implementations to provide the structural block diagram of parallel carriers restoration methods, in one embodiment
In, same to phase (I) data flow of parallel carriers data and orthogonal (Q) data flow are passed through to the CPRDIC module for realizing cordic algorithm
After carrying out coordinate conversion, the polar coordinates of same phase (I) data flow and orthogonal (Q) data flow are obtained, respectively by same phase (I) data flow
In orthogonal (Q) data flow input phase frequency detector (PFD), same to phase (I) data flow passes through the amplitude comparator of phase frequency detector
Capturing frequency deviation is carried out, then the offset estimation of capture is subjected to tracking holding, orthogonal (Q) data flow with hold amplifier via tracking
Through being carried out by the decision device of phase frequency detector after being subtracted each other by the sync carrier data of adder and digital controlled oscillator feedback
Skew capture, then the skew estimation of capture is subjected to tracking holding with hold amplifier via tracking, it is put via tracking with holding
Big device exports the error term of 8 road parallel carriers data after carrying out tracking holding, then calculates 8 tunnels simultaneously by 8 tunnel average calculation units
The error term of row carrier data is averaged, and obtains the phase error signal of parallel carriers data.By the phase of parallel carriers data
Bit error signal inputs subsequent loop filter and digital controlled oscillator carries out phase compensation, obtains sync carrier data, then lead to
The CPRDIC module for crossing a realization cordic algorithm carries out coordinate conversion to sync carrier data, obtains sync carrier data
Rectangular co-ordinate data, and export the rectangular co-ordinate data of sync carrier data.
In one embodiment, above-mentioned parallel carriers restoration methods are before step S101 further include:
Step S105: initializing the road the N parallel carriers data, and the initialization operation includes matching filter
Wave, Timing Synchronization and signal equalization.
In a particular application, the carrier data of input is initialized, by bandpass filtering AGC amplifier into
After row amplification, it is added on carrier recovery circuit and coherence data wave detector parallel, carrier recovery circuit, which has regenerated, is added to relevant number
According to the demodulation coherent reference of wave detector, coherence data wave detector is extracted same phase (I) data flow and orthogonal (Q) data flow, will be same
After phase (I) data flow and the low-pass filtered progress matched filtering of orthogonal (Q) data flow, it is sent to corresponding bit synchronization plug-in unit and signal
Adjuster (BSSC) unit is timed synchronous and signal equalization, and the signal conditioner unit is by providing serial data and clock
Output can restore the relevant symbol sequential for keeping data flow synchronous with symbol clock.
Parallel carriers restoration methods provided in this embodiment, by phase frequency detector capture parallel carriers data frequency deviation and
Skew, and be averaged by the error term to multidiameter delay carrier data to eliminate carrier deviation, then pass through loop filter
Phase compensation is carried out with digital controlled oscillator, obtaining and phase difference consistent with the road N parallel carriers data frequency is the synchronous of steady state value
Carrier data realizes carrier auxiliary, and efficiently solving the carrier recovery algorithm of current modem, to be easy to appear carrier wave inclined
The problem of difference influences the performance of modem, and Terahertz communication system performance is caused to decline.
Embodiment two:
As shown in figure 3, in the present embodiment, the step S104 in embodiment one is specifically included:
Step S201: the phase error is inputted into loop filter, filters out the high fdrequency component of the phase error.
In a particular application, loop filter is a linear low-pass filters, for filtering out in phase error voltage
High fdrequency component and noise.Common loop filter has RC integration filter, passive proportion integration filter and active ratio product
Filter-divider.
Step S202: will filter out the input digital controlled oscillator of the phase error after high fdrequency component and carry out phase compensation, obtain and N
The frequencies of road parallel carriers data is consistent and phase difference is the sync carrier data of steady state value.
In a particular application, phase compensation is carried out by the low quadrature error of digital controlled oscillator, so that vibrating by numerical control
The sync carrier data exported after device are consistent with the frequency of parallel carriers data of input, and phase difference remains steady state value.
Step S203: carrying out coordinate conversion to the sync carrier data, and the right angle for obtaining the sync carrier data is sat
Data are marked, and export the rectangular co-ordinate data of the sync carrier data.
In a particular application, pass through Coordinate Rotation Digital algorithm (Coordinate Rotation Digital
Computer, CORDIC) by the polar coordinate transform of sync carrier data be rectangular co-ordinate, obtain sync carrier data right angle sit
Mark data are simultaneously exported.It should be noted that cordic algorithm is to realize rectangular co-ordinate by angle rotation and shifter-adder
The algorithm that system and polar coordinate system are converted, its implementation are not repeated here herein as the prior art.
Embodiment three:
As shown in figure 4, the present embodiment provides a kind of parallel carriers recovery devices 100, for executing the side in embodiment one
Method step comprising coordinate transformation module 110, frequency and phase discrimination module 120, error calculating module 130 and synchronization module 140.
Coordinate transformation module 110 obtains the road N parallel carriers for being coordinately transformed the road N parallel carriers data
The polar data of data；Wherein, N >=1 and N are integer.
Frequency and phase discrimination module 120 is used for polar data input phase frequency detector to obtain each road parallel carriers number
According to error term.
Error calculating module 130 is carried parallel for the error term of each road parallel carriers data to be averaged
The phase error signal of wave number evidence.
Synchronization module 140 is used to the phase error signal inputting loop filter and digital controlled oscillator carries out phase benefit
It repays, the compensated sync carrier data of output phase.
In one embodiment, above-mentioned parallel carriers recovery device further includes initialization module.
Above-mentioned initialization module is for initializing the road the N parallel carriers data, the initialization operation
Including matched filtering, Timing Synchronization and signal equalization.
It should be noted that parallel carriers recovery device provided in an embodiment of the present invention, as with shown in Fig. 1 of the present invention
Embodiment of the method is based on same design, and bring technical effect is identical as embodiment of the method shown in Fig. 1 of the present invention, particular content
It can be found in the narration in embodiment of the method shown in Fig. 1 of the present invention, details are not described herein again.
Therefore, a kind of parallel carriers recovery device provided in this embodiment can equally be captured simultaneously by phase frequency detector
The frequency deviation and skew of row carrier data, and be averaged by the error term to multidiameter delay carrier data inclined to eliminate carrier wave
Difference, then phase compensation is carried out by loop filter and digital controlled oscillator, obtain it is consistent with the road N parallel carriers data frequency and
Phase difference is the sync carrier data of steady state value, realizes that carrier auxiliary, the carrier wave for efficiently solving current modem are extensive
The problem of double calculation method is easy to appear carrier deviation, influences the performance of modem, and Terahertz communication system performance is caused to decline.
Example IV:
As shown in figure 5, in the present embodiment, the synchronization module 104 in example IV includes for executing corresponding to Fig. 3
Embodiment in method and step structure comprising filter unit 201, compensating unit 202, output unit 203.
Filter unit 201 is used to the phase error inputting loop filter, filters out the high frequency division of the phase error
Amount.
Compensating unit 202 is used to filter out the phase error input digital controlled oscillator progress phase compensation after high fdrequency component,
Obtain the sync carrier data that and phase difference consistent with the frequency of the road N parallel carriers data is steady state value.
Output unit 203 is used to carry out coordinate conversion to the sync carrier data, obtains the sync carrier data
Rectangular co-ordinate data, and export the rectangular co-ordinate data of the sync carrier data.
Embodiment five:
Fig. 6 is the schematic diagram for the terminal device that the embodiment of the present invention five provides.As shown in fig. 6, the terminal of the embodiment is set
Standby 6 include: processor 60, memory 61 and are stored in the meter that can be run in the memory 61 and on the processor 60
Calculation machine program 62, such as program.The processor 60 realizes above-mentioned each picture processing side when executing the computer program 62
Step in method embodiment, such as step S101 to S104 shown in FIG. 1.Alternatively, the processor 60 executes the computer
The function of each module/unit in the above system embodiment, such as the function of module 101 to 104 shown in Fig. 4 are realized when program 62.
Illustratively, the computer program 62 can be divided into one or more module/units, it is one or
Multiple module/units are stored in the memory 61, and are executed by the processor 60, to complete the present invention.Described one
A or multiple module/units can be the series of computation machine program instruction section that can complete specific function, which is used for
Implementation procedure of the computer program 62 in the terminal device 6 is described.For example, the computer program 62 can be sat
It is as follows to mark conversion module, frequency and phase discrimination module, error calculating module and synchronization module, each module concrete function:
Coordinate transformation module obtains the road the N parallel carriers number for being coordinately transformed the road N parallel carriers data
According to polar data；Wherein, N >=1 and N are integer；
Frequency and phase discrimination module, for the polar data to be inputted phase frequency detector to obtain each road parallel carriers data
Error term；
Error calculating module obtains parallel carriers for the error term of each road parallel carriers data to be averaged
The phase error signal of data；
Synchronization module, for the phase error signal to be inputted loop filter and digital controlled oscillator progress phase benefit
It repays, the compensated sync carrier data of output phase.
The terminal device 6 can be the calculating such as desktop PC, notebook, palm PC and cloud management server
Equipment.The terminal device may include, but be not limited only to, processor 60, memory 61.It will be understood by those skilled in the art that
Fig. 6 is only the example of terminal device 6, does not constitute the restriction to terminal device 6, may include more more or less than illustrating
Component, perhaps combine certain components or different components, such as the terminal device can also be set including input and output
Standby, network access equipment, bus etc..
Alleged processor 60 can be central processing unit (Central Processing Unit, CPU), can also be
Other general processors, digital signal processor (Digital Signal Processor, DSP), specific integrated circuit
(Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field-
Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic,
Discrete hardware components etc..General processor can be microprocessor or the processor is also possible to any conventional processor
Deng.
The memory 61 can be the internal storage unit of the terminal device 6, for example, terminal device 6 hard disk or
Memory.The memory 61 is also possible to the External memory equipment of the terminal device 6, such as is equipped on the terminal device 6
Plug-in type hard disk, intelligent memory card (Smart Media Card, SMC), secure digital (Secure Digital, SD) card,
Flash card (Flash Card) etc..Further, the memory 61 can also both include the storage inside of the terminal device 6
Unit also includes External memory equipment.The memory 61 is for storing needed for the computer program and the terminal device
Other programs and data.The memory 61 can be also used for temporarily storing the data that has exported or will export.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each function
Can unit, module division progress for example, in practical application, can according to need and by above-mentioned function distribution by different
Functional unit, module are completed, i.e., the internal structure of the system is divided into different functional unit or module, more than completing
The all or part of function of description.Each functional unit in embodiment, module can integrate in one processing unit, can also
To be that each unit physically exists alone, can also be integrated in one unit with two or more units, it is above-mentioned integrated
Unit both can take the form of hardware realization, can also realize in the form of software functional units.In addition, each function list
Member, the specific name of module are also only for convenience of distinguishing each other, the protection scope being not intended to limit this application.It is above-mentioned wireless
The specific work process of unit in terminal, module, can refer to corresponding processes in the foregoing method embodiment, no longer superfluous herein
It states.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment
The part of load may refer to the associated description of other embodiments.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
The scope of the present invention.
In embodiment provided by the present invention, it should be understood that disclosed system/terminal device and method, it can be with
It realizes by another way.For example, system described above/terminal device embodiment is only schematical, for example, institute
The division of module or unit is stated, only a kind of logical function partition, there may be another division manner in actual implementation, such as
Multiple units or components can be combined or can be integrated into another system, or some features can be ignored or not executed.Separately
A bit, shown or discussed mutual coupling or direct-coupling or communication connection can be through some interfaces, system
Or the INDIRECT COUPLING or communication connection of unit, it can be electrical property, mechanical or other forms.
The unit for being set as separate part description may or may not be physically separated, and be set as single
The component of member display may or may not be physical unit, it can and it is in one place, or may be distributed over
In multiple network units.Some or all of unit therein can be selected to realize this embodiment scheme according to the actual needs
Purpose.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated module/unit, which is realized in the form of SFU software functional unit and is arranged, is independent product sale
Or it in use, can store in a computer readable storage medium.Based on this understanding, the present invention realizes above-mentioned reality
The all or part of the process in a method is applied, relevant hardware can also be instructed to complete by computer program, it is described
Computer program can be stored in a computer readable storage medium, the computer program when being executed by processor, it can be achieved that
The step of above-mentioned each embodiment of the method.Wherein, the computer program includes computer program code, the computer program
Code can be source code form, object identification code form, executable file or certain intermediate forms etc..Computer-readable Jie
Matter may include: can carry the computer program code any entity or system, recording medium, USB flash disk, mobile hard disk,
Magnetic disk, CD, computer storage, read-only memory (ROM, Read-Only Memory), random access memory (RAM,
Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium etc..It should be noted that described
The content that computer-readable medium includes can carry out increasing appropriate according to the requirement made laws in jurisdiction with patent practice
Subtract, such as in certain jurisdictions, according to legislation and patent practice, computer-readable medium do not include be electric carrier signal and
Telecommunication signal.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (10)
1. a kind of parallel carriers restoration methods characterized by comprising
The road N parallel carriers data are coordinately transformed, the polar data of the road the N parallel carriers data is obtained；Wherein, N
>=1 and N is integer；
The polar data is inputted into phase frequency detector to obtain the error term of each road parallel carriers data；
The error term of each road parallel carriers data is averaged, the phase error signal of parallel carriers data is obtained；
The phase error signal is inputted into loop filter and digital controlled oscillator carries out phase compensation, output phase is compensated
Sync carrier data.
2. obtaining institute the method according to claim 1, wherein the road N parallel carriers data are coordinately transformed
Before the polar data for stating the road N parallel carriers data, comprising:
The road the N parallel carriers data are initialized, the initialization operation include matched filtering, Timing Synchronization and
Signal equalization.
3. obtaining institute the method according to claim 1, wherein the road N parallel carriers data are coordinately transformed
State the polar data of the road N parallel carriers data, comprising:
By Coordinate Rotation Digital algorithm by the rectangular coordinates transformation of the road the N parallel carriers data be polar coordinates, obtain the N
The polar data of road parallel carriers data.
4. the method according to claim 1, wherein the phase error is inputted loop filter and numerical control vibration
It swings device and carries out phase compensation, the compensated sync carrier data of output phase, comprising:
The phase error is inputted into loop filter, filters out the high fdrequency component of the phase error；
The input digital controlled oscillator of the phase error after high fdrequency component will be filtered out and carry out phase compensation, obtained and the road N parallel carriers number
According to frequency is consistent and phase difference is the sync carrier data of steady state value；
Coordinate conversion is carried out to the sync carrier data, obtains the rectangular co-ordinate data of the sync carrier data, and export
The rectangular co-ordinate data of the sync carrier data.
5. the method according to claim 1, wherein the model of the phase frequency detector is as follows:
Wherein, ekFor phase frequency detector output error term,For the skew estimation of phase frequency detector output, λ is frequency and phase discrimination
The adjusting error threshold of device, ckFor the polar data of output, θ is the set of cornerwise constellation point of planisphere.
6. a kind of parallel carriers recovery device characterized by comprising
Coordinate transformation module obtains the road the N parallel carriers data for being coordinately transformed the road N parallel carriers data
Polar data；Wherein, N >=1 and N are integer；
Frequency and phase discrimination module, for the polar data to be inputted phase frequency detector to obtain the mistake of each road parallel carriers data
Poor item；
Error calculating module obtains parallel carriers data for the error term of each road parallel carriers data to be averaged
Phase error signal；
Synchronization module, it is defeated for the phase error signal to be inputted loop filter and digital controlled oscillator progress phase compensation
Sync carrier data after phase compensation out.
7. parallel carriers recovery device according to claim 6, which is characterized in that the parallel carriers recovery device also wraps
Include initialization module；
Initialization module, for initializing to the road the N parallel carriers data, the initialization operation includes matching
Filtering, Timing Synchronization and signal equalization.
8. parallel carriers recovery device according to claim 6, which is characterized in that the synchronization module includes:
Filter unit filters out the high fdrequency component of the phase error for the phase error to be inputted loop filter；
Compensating unit carries out phase compensation for that will filter out the input digital controlled oscillator of the phase error after high fdrequency component, obtains and N
The frequencies of road parallel carriers data is consistent and phase difference is the sync carrier data of steady state value；
Output unit, for carrying out coordinate conversion to the sync carrier data, the right angle for obtaining the sync carrier data is sat
Data are marked, and export the rectangular co-ordinate data of the sync carrier data.
9. a kind of terminal device, including memory, processor and storage are in the memory and can be on the processor
The computer program of operation, which is characterized in that the processor realizes such as claim 1 to 5 when executing the computer program
The step of any one the method.
10. a kind of computer readable storage medium, the computer-readable recording medium storage has computer program, and feature exists
In when the computer program is executed by processor the step of any one of such as claim 1 to 5 of realization the method.
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