CN103916352B - Carrier frequency shift compensation device and method - Google Patents
Carrier frequency shift compensation device and method Download PDFInfo
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- CN103916352B CN103916352B CN201310003166.4A CN201310003166A CN103916352B CN 103916352 B CN103916352 B CN 103916352B CN 201310003166 A CN201310003166 A CN 201310003166A CN 103916352 B CN103916352 B CN 103916352B
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Abstract
The present invention discloses a kind of carrier frequency shift compensation method, and it is applied to a communication system, comprises the following steps：Be mixed parameter, one first filtering parameter and one first interpolation parameters according to one respectively carries out Frequency mixing processing, filtering process and interpolation processing to an input signal, to produce a result；A Carrier frequency offset estimation value of the input signal is calculated according to the result；The mixing parameter is adjusted according to the Carrier frequency offset estimation value；And Frequency mixing processing, filtering process and interpolation processing are carried out to the input signal according to being mixed parameter, one second filtering parameter and one second interpolation parameters after the adjustment respectively, wherein, the first interpolation parameters system is relevant to the cut-off frequency corresponding to first filtering parameter.
Description
Technical field
The present invention is to can be used for a radio communication on a kind of carrier frequency shift compensation device and method, especially one kind
Carrier frequency shift compensation device and method in system.
Background technology
In a wireless communication system, the signal that transmission end can be intended to transmission is modulated, and by the signal liter after modulation
Frequency is to radio frequency transmitting；And after receiving terminal receives the radiofrequency signal via an antenna, can be by the frequency down of the signal to fundamental frequency
To be demodulated system treatment.However, because transmission end is used for the frequency of oscillation and receiving terminal of raising frequency for the frequency of oscillation of frequency reducing
Have differences, therefore signal after receiving terminal frequency reducing can have carrier frequency shift（Carrier Frequency Offset,
CFO）Problem, this can increase the difficulty of demodulation, and cause the transmitted error rate of the wireless communication system to rise.
In view of above-mentioned, general wireless communication system can set Carrier frequency offset estimation and compensation device, to solve to carry
The problem of frequency offset, related background art refers to the U.S. patent application case " Signal of applicant's previously application
Processing Circuit and Method Thereof”（Publication number：US2011/0188611A1）, U.S. Patent application
Case " Circuit for Detecting a Digital Data Stream and Associated Method "（Publication number：
US2010/0296002A1）And U.S. patent application case " Apparatus for Detecting Digital Video
Signal Parameters and Method Thereof”（Publication number：US2011/0002422A1）.However, logical in some
In letter system, a such as digital video broadcasting satellite（Digital Video Broadcasting-Satellite,DVB-S）It is logical
Letter system, the phenomenon of carrier frequency shift becomes apparent compared with other communication systems, especially in low noise ratio（Signal to
Noise Ratio,SNR）When, the problem of carrier frequency shift can be particularly acute, therefore, the art is directed to this situation still
There is the demand of further improvement.
The content of the invention
In view of above-mentioned, a purpose of the invention is to provide a kind of carrier frequency shift compensation device and a kind of carrier frequency
Rate offset compensating method, to solve the problems, such as prior art.
Present invention is disclosed a kind of carrier frequency shift compensation method, a communication system is applied to, including：Respectively according to one
Mixing parameter, one first filtering parameter and one first interpolation parameters carry out Frequency mixing processing, filtering process to an input signal and insert
Benefit treatment, to produce a result；A Carrier frequency offset estimation value of the input signal is calculated according to the result；According to
The mixing parameter is adjusted according to the Carrier frequency offset estimation value；And respectively according to mixing parameter, one second filtering after the adjustment
Parameter and one second interpolation parameters carry out Frequency mixing processing, filtering process and interpolation processing to the input signal, wherein, this first insert
Benefit parameter is relevant to the cut-off frequency corresponding to first filtering parameter.
The present invention separately discloses a kind of carrier frequency shift compensation device, is applied to a communication system, comprising：One mixing
Device, for carrying out Frequency mixing processing to an input signal, to produce a frequency-shift signaling；One wave filter, for entering to the frequency-shift signaling
Row filtering process, to produce a filtering signal；One interpolator, it is one defeated to produce for carrying out interpolation processing to the filtering signal
Go out signal；One carrier frequency shift estimator, for producing a Carrier frequency offset estimation value according to the output signal；And one
Controller, for when the Carrier frequency offset estimation value is estimated, making the wave filter and the interpolator be filtered according to one first respectively
Wave parameter and one first interpolation parameters are operated, and after the Carrier frequency offset estimation value is estimated, according to the carrier wave
Frequency offset estimate f adjusts a mixing parameter of the frequency mixer, and the wave filter and the interpolator is filtered according to one second respectively
Wave parameter and one second interpolation parameters are operated, wherein, first interpolation parameters is relevant to corresponding to first filtering parameter
A cut-off frequency.
Feature for the present invention, implementation and effect, hereby coordinate accompanying drawing to make being described as follows for preferred embodiment.
Brief description of the drawings
Fig. 1 is the schematic diagram of an embodiment of carrier frequency shift compensation device of the invention.
Fig. 2 is the schematic diagram of an embodiment of the carrier frequency shift estimator of Fig. 1.
Fig. 3 is the flow chart of an embodiment of carrier frequency shift compensation method of the invention.
Main element symbol description
100 carrier frequency shift compensation devices
110 controllers
120 frequency mixers
122 mixing parameter storage circuits
124 mixting circuits
130 wave filters
132 filtering parameter storage circuits
134 filter circuits
140 interpolators
142 interpolation parameters storage circuits
144 interpolating circuits
150 carrier frequency shift estimators
152 postpone and multiplication unit
154 frequency offset estimation units
S310 is mixed the input signal of parameter processing one to produce a frequency-shift signaling according to one
S320 determines the first filtering parameter according to a Carrier frequency offset estimation
S330 filters the frequency-shift signaling to produce a filtering signal according to first filtering parameter
S340 determines the first interpolation parameters according to first filtering parameter
S350 carries out interpolation to the filtering signal to produce a result according to the first interpolation parameters
S360 produces a Carrier frequency offset estimation value according to the result
S370 updates the mixing parameter to compensate the carrier frequency of the input signal according to the Carrier frequency offset estimation value
Rate offsets
S380 according to a normal operation set update first filtering parameter be one second filtering parameter
S390 according to the normal operation set renewal first interpolation parameters be second interpolation parameters
Specific embodiment
The idiom of technical terms reference the art of this specification, such as this specification has to part term and is subject to
Illustrate or define, the explanation of the part term is defined by the explanation of this specification or definition.In addition, be embodied as it is possible before
Put, the relativeness between object or event described by this specification, connotation can include direct or indirect relation, so-called
" indirect " still has the presence of intermediate or physical space between referring to object, or still has depositing for intermediate event or time interval between self-explanatory characters' part
.Furthermore, herein below is on carrier frequency shift（Carrier Frequency Offset,CFO）Compensation device and method,
For technology or principle that the field is commonly seen, if not being related to technical characteristic of the invention, by it will not go into details.In addition, it is illustrated that middle unit
The step of shape of part, size, ratio and flow, order etc. was only to illustrate, and for the art, tool usually intellectual understands
The present invention is used, non-that practical range of the invention is any limitation as.
In addition, each embodiment of following description has one or more technical characteristics respectively, so this is not meant to
Must simultaneously implement all technical characteristics in any embodiment using present inventor, or be only capable of being performed separately in different embodiments
One or all technical characteristic.In other words, be embodied as it is possible under the premise of, the art tool usually intellectual can
According to disclosure of the invention, and regarding design specification or implementation demand, optionally implement part or complete in any embodiment
The technical characteristic in portion, or optionally implement the combination of all or part of technical characteristic in multiple embodiments, thereby increase
The elasticity when present invention is implemented.
Disclosure of the invention includes a kind of carrier frequency shift compensation device and a kind of carrier frequency shift compensation side
Method, the carrier frequency shift compensation device and method can be applied to the demodulator in a communication system（Demodulator）,
And the demodulator is helped in low noise ratio（Signal to Noise Ratio,SNR）Environment is issued to and compares environment with strong noise
Under similar effect, the demodulator can be a digital video broadcasting satellite（Digital Video Broadcasting–
Satellite,DVB-S）Demodulator in system, right this not limitation of the present invention, only illustrated for the present invention and
The art personage understands the present invention and is used.Additionally, be embodied as it is possible under the premise of, the art has usual knowledge
Person can be according to selecting the invention discloses content equivalent element or step to realize the present invention, that is, implementation of the invention is simultaneously
It is not limited to disclosed embodiment.Further, since the portion that carrier frequency shift compensation device of the invention is included
Point or can be known element for whole element is indivedual, therefore in the abundant announcement for not influenceing the device to invent and can be real according to this
On the premise of applying, below illustrate for realizing that the details of the Individual elements that the device is invented will give memorandum.Furthermore, it is of the invention
Carrier frequency shift compensation method can be realized by carrier frequency shift compensation device of the invention, may also carried through other
Frequency offset compensation device realizes, similarly, in the abundant announcement for not influenceing the method to invent and before can implementing according to this
Put, below illustrate that for performing the details of the hardware unit that the method is invented memorandum will be given.
Fig. 1 is referred to, it is the schematic diagram of an embodiment of carrier frequency shift compensation device of the invention.The present embodiment
Can be used for a demodulator（Such as demodulator of a DVB-S systems）, but other need carrier frequency shift compensation function
Device can also use the present embodiment.As shown in figure 1, the carrier frequency shift compensation device 100 of the present embodiment is included：One control
Device 110, the controller 110 can be a microcontroller（Micro Control Unit,MCU）, a programmable logic controller (PLC)
（Programmable Logic Controller,PLC）Or other can perform the circuit of controller function of the present invention；
One frequency mixer（Mixer）120, for producing a frequency-shift signaling, the frequency mixer 120 to include a mixing parameter according to an input signal
Storage circuit 122（A such as buffer）And a mixting circuit 124（Such as a raising frequency and/or frequency down circuit）, it is mixed parameter
Storage circuit 122 couples the controller 110, and for storing at least one mixing parameter, mixting circuit 124 then couples the mixing parameter
Storage circuit 122, for carrying out shift frequency to input signal according at least one mixing parameter, to produce the frequency-shift signaling；One
Wave filter（Filter）130, the controller 110 and the frequency mixer 120 are coupled, for being filtered to the frequency-shift signaling, to produce
A raw filtering signal, the wave filter 130 includes a filtering parameter storage circuit 132（A such as buffer）And a filter circuit
134（A such as low-pass filter circuit）, filtering parameter storage circuit 132 couples the controller 110, for storing an at least filtering
Parameter, and filter circuit 134 then couples the filtering parameter storage circuit 132 and the frequency mixer 120, for according at least one filter
Wave parameter is filtered to the frequency-shift signaling, to produce the filtering signal；One interpolator（Interpolator）140, coupling should
Wave filter 130 and the controller 110, for carrying out interpolation to the filtering signal, to produce an output signal, the interpolator 140
Comprising an interpolation parameters storage circuit 142（A such as buffer）With an interpolating circuit 144, the coupling of interpolation parameters storage circuit 142
Connect the controller 110, for storing an at least interpolation parameters, interpolating circuit 144 then couple the interpolation parameters storage circuit 142 with
The wave filter 130, for carrying out interpolation to the filtering signal to produce the output signal according to an at least interpolation parameters；And
One carrier frequency shift estimator（CFO Estimator）150, the interpolator 140 and the controller 110 are coupled, for foundation
The output signal produces an at least Carrier frequency offset estimation value, and the wherein controller 110 is inclined according to an at least carrier frequency
Move estimate and update foregoing at least one mixing parameter to compensate the carrier frequency shift of the input signal, and according to a normal operation
Setting updates a foregoing at least filtering parameter and an at least interpolation parameters respectively.That is, inclined in carrier frequency of the invention
During shifting compensation device 100 produces the Carrier frequency offset estimation value, controller 110 makes wave filter 130 and interpolator 140
First operated according to one first filtering parameter and one first interpolation parameters respectively；And work as carrier frequency shift estimator 150 and estimate
When calculating the Carrier frequency offset estimation value, carrier frequency shift compensation device 100 can carry out a normal operation, make controller
The 110 mixing parameters that frequency mixer 120 is adjusted according to the Carrier frequency offset estimation value for estimating, and according to foregoing normal operation
Setting updates the first filtering parameter and the first interpolation parameters, makes wave filter 130 and interpolator 140 respectively according to one second filtering ginseng
Number and one second interpolation parameters are operated.
From the above, in the present embodiment, when carrier frequency shift compensation device 100 has started and/or run into transmission end
During variation（For example transmission end is caused to be replaced by another satellite because of channel switch）, the frequency mixer 120 can first according to a mixing
Parameter carries out frequency reducing to the input signal, and to produce the frequency-shift signaling, now the frequency-shift signaling has a carrier frequency to be compensated
Rate offsets.Then, wave filter 130 can be filtered according to the first filtering parameter to the frequency-shift signaling, to produce the filtering to believe
Number, now first filtering parameter includes a signal frequency range, an attenuation effect（Roll Off Effect）Estimate item and
One Carrier frequency offset estimation, in more detail, during carrier frequency offset is estimated, due to carrier frequency shift
Not yet adequately compensated for, the signal for needed for avoiding wave filter 130 from filtering demodulation, foregoing first filtering parameter of present invention design
When attenuation effect and possible carrier frequency shift amplitude can be listed in and considered, with suitably by the filtering frequency range of wave filter 130
Larger scope is set in, in fact, when different types of input signal is sent to different types of receiving terminal, may correspond to
Different signal frequency range, attenuation effect estimate item and Carrier frequency offset estimation, wherein, Carrier frequency offset estimation
The patient side-play amount of the carrier frequency that can be used by communication system and system institute is estimated.For example, the signal
The corresponding frequency range of frequency range is equal to a symbol rate of the input signal（Symbol Rate,SR）10MHz, attenuation effect estimate item
Corresponding frequency range is 3.5MHz（That is, assume that attenuation parameter α is 0.175）And the corresponding frequency range of Carrier frequency offset estimation is
10MHz（That is, assume to estimate frequency shift (FS) CFO in lower frequency side and high frequency sideEstimationRespectively 5MHz）, then according to this reality
Apply example, the filtering frequency range of wave filter 130（Or be an estimation frequency range BWEstimation）Can be set as above-mentioned every corresponding
Frequency range sum total 23.5MHz, represented as BW with mathematical expressionEstimation=SR×(1+2α)+2×CFOEstimation=10×(1+
2 × 0.175)+2 × 5=23.5MHz, due to symbol rate 10MHz of this frequency range more than input signal that wave filter 130 is used,
Therefore it is difficult the missed signal because of signal skew.
Hold above-mentioned, after wave filter 130 produces the filtering signal, interpolator 140 is according to the first interpolation parameters to the filtering
Signal carries out interpolation to produce the output signal, and now first interpolation parameters is relevant to corresponding to above-mentioned first filtering parameter
Cut-off frequency（That is the frequency of the 3db points of filtering signal）, more precisely, now the output speed of interpolator 140 is equal to upper
State the value 23.5MHz of the frequency range of wave filter 130, detailed related content will be in hereinafter illustrating；Then, carrier frequency shift
Estimator 150 can calculate the Carrier frequency offset estimation value according to the output signal of the generation of interpolator 140, more precisely,
Carrier frequency shift estimator 150 is in multiple time points（Such as 1,000 time points）Multiple is calculated according to the output signal to estimate
Evaluation, those estimates then be subject to averagely to obtain the Carrier frequency offset estimation value again；Afterwards, controller 110 just may be used
The Carrier frequency offset estimation value is read with from carrier frequency shift estimator 150, to update foregoing mixing parameter, and is thereby mended
Repay the carrier frequency shift.Since having calculated the Carrier frequency offset estimation value again, controller 110 can be according to foregoing normal operation
Setting updates the first filtering parameter and the first interpolation parameters, that is to say, that now controller 110 makes wave filter 130 according to the
Two filtering parameters are filtered to the frequency-shift signaling, and make interpolator 140 enter to the filtering signal according to the second interpolation parameters
Row interpolation, wherein the second filtering parameter is different from the first filtering parameter, and it is relevant with the symbol rate of input signal, for example,
Controller 110 can make the filtering frequency range corresponding to the second filtering parameter be equal to the symbol of foregoing input signal according to the positive operating settings
First rate 10MHz, and make the output speed of interpolator 140 corresponding to the second interpolation parameters be two times of symbol rate 20MHz, change speech
It, the first filtering parameter is updated to the second filtering parameter by controller 110 according to the normal operation, and by the first interpolation parameters
It is updated to the second interpolation parameters so that the filtering frequency range of wave filter 130（I.e. one normal frequency range）Equal to the symbol rate of input signal,
Namely 10MHz, and the output speed for causing interpolator 140（That is a normal speed）Equal to two times of symbol rates, that is,
20MHz.In the normal operation, because controller 110 updates foregoing mixing ginseng according to the Carrier frequency offset estimation value
Number, therefore the filtering frequency range of wave filter 130 can directly using the symbol rate 10MHz of input signal, additionally, interpolator 140 is just
Depending on often the output speed in running is according to the system using this carrier frequency shift compensation device 100, and ginseng is filtered with second
Number without directly related, for example in the present embodiment, output speed using input signal two times of symbol rate 20MHz.
Note that above-described embodiment is used for understanding the present invention, be not used to the limitation present invention.The art has logical
Normal skill under this invention can be disclosed and impose change to the embodiment, for example：Calculating the Carrier frequency offset estimation value
Before, the filtering parameter can only comprising the signal frequency range and Carrier frequency offset estimation；The attenuation effect estimates item and carrier wave
The visual design specification of Frequency offset estimation or practical application situation are adjusted；The plurality of time point can be more or less than 1,000
It is individual；The output speed of the interpolator 140 can be not equal to the wave filter 130 before the Carrier frequency offset estimation value is calculated
Filtering frequency range, as long as running result is still in the acceptable scope of implementer；The plurality of estimate can together be considered as the load
Frequency offset estimate is simultaneously supplied to the controller 110, so that the controller 110 carries out average computation, weighted calculation to it
Or other predetermined computations obtain a frequency offseting value, then controller 110 adjusts mixing ginseng further according to the frequency offseting value
Number；In addition, the filtering parameter after updating can also include attenuation effect and considering and causing that corresponding frequency range is more than foregoing symbol
The value of rate；And the interpolation parameters after updating can cause that the output speed of corresponding interpolator 140 is more than or small on demand
In two times of symbol rates.In addition, belonging to known techniques, this skill for above-mentioned frequency mixer 120, wave filter 130 and interpolator 140 are independent
Art field personage can realize those parts from the appropriate circuit of appropriate element or composition according to of the invention announcement, and
On the premise of not influenceing the abundant requirement that disclose and can implement according to this of the invention, for the explanation for only relating to prior art, this
Specification will give memorandum.
Fig. 2 is referred to, it is an embodiment schematic diagram of the carrier frequency shift estimator 150 of Fig. 1, the carrier frequency is inclined
The running theory for moving estimator 150 refers to " simultaneous techniques of numerical digit receiver " book（Author：Umberto Mengali
and Aldo N.D’Andrea；Title：Synchronization Techniques for Digital Receivers；Phase
Close chapters and sections number of pages：Chapter3.6,Page133；ISBN publication numbers：0-306-45725-3.Claim reference paper 1 afterwards）, below lead
The part for relating to feature of the invention is illustrated by.As shown in Fig. 2 the carrier frequency shift estimator 150 is included：One prolongs
Slow and multiplication（Delay-and-Multiply）Unit 152（Detail with reference reference paper 1）, foregoing interpolator 140 is coupled, use
Come according to the output signal（x(t)）Produce an operation values（z(t)）, according to reference paper 1, the operation values can be represented with mathematical expression
For：Wherein t is time, x*For the complex conjugate of x (t), Δ T are time delay, it corresponds to foregoing interpolation
The interpolation parameters of device 140；And a frequency offset estimation unit 154（Detail with reference reference paper 1）, for according to the computing
Value produces said carrier frequency bias estimation value (fCFO）, according to reference paper 1, the Carrier frequency offset estimation value can use mathematics
Formula is expressed as：fCFO=(1/2 π Δ T) arg { ∫ z (t) dt }, wherein t values are 0 to T0Between.And work as the frequency offset estimation unit
After 154 calculate the Carrier frequency offset estimation value, carrier frequency shift estimator 150 sends a signal to notify foregoing control
Device processed 110, controller 110 reads this carrier frequency offset values from carrier frequency shift estimator 150 again, and updates according to this foregoing
The mixing parameter of frequency mixer 120, to compensate the carrier frequency shift of foregoing input signal.Carrying out the Carrier frequency offset estimation
When, in order to effectively reduce the influence in output signal caused by noise, make the estimation of carrier frequency shift more accurate, the present embodiment
Make the first filtering parameter that signal frequency range, attenuation effect are estimated into item and Carrier frequency offset estimation item are included to consider and according to this
Filtering frequency range is determined, is then understood with reference to the theory of reference paper 1, when time delay Δ T is set as two times of first filtering parameter institute
During the integral multiple reciprocal of frequency range shared by corresponding zero to cut-off frequency（That is, Δ T=k/ (2BWFilter), BWFilterIt is the first filter
Corresponding to wave parameter zero to cut-off frequency shared by frequency range, k be positive integer）, foregoing setting can make the noise in output signal
Item is zero, and then carrier frequency shift estimator 150 is more accurately estimated Carrier frequency offset estimation value, without by this
The influence of noise.Note that in another embodiment of the present invention, above-mentioned time delay Δ T is similar to k/2BWFilter, for example
Positioned at k/2BWFilterAdd and subtract in the interval of a scope, the scope can be based on design and hold by the art tool usually intellectual
Degree of bearing is decided in its sole discretion, and in other words, whether the boundary of the scope can be come according to the influence of foregoing noise beyond design tolerance
Determine.In addition, the practice of said carrier frequency offset estimator is only for example, the limitation present invention, other known load are not used to
Frequency offset estimation theory or implementation etc., must be this on the premise of the requirement that can implement according to this of the invention is not influenceed
Invention is used.
As described above, the present invention gives wave filter 130 and interpolation respectively before and after Carrier frequency offset estimation value is obtained
The different filtering parameter of device 140 and different interpolation parameterses, therefore, even if the present invention is operated in the case where noise is than low environment, also
Can obtain with noise than environment high under operate similar effect, in other words, using device of the invention（A such as DVB-S
The demodulator of system）For noise than less sensitive, and there can be more reliable and more stable efficiency.
In addition to above-mentioned carrier frequency shift compensation device 100, the present invention separately discloses a kind of carrier frequency shift compensation
Method, for compensating the carrier frequency shift of an input signal, the method can pass through carrier frequency shift compensation dress of the invention
Put 100 to realize, may also pass through the device of other executable this method to realize.As shown in figure 3, an embodiment of the method
Comprise the steps of：
Step S310：The input signal of parameter processing one is mixed according at least one, to produce a frequency-shift signaling, this step can be through
By a frequency mixer（The frequency mixer 120 of such as Fig. 1）To realize；
Step S320：One first filtering parameter, the carrier frequency shift are determined according to a Carrier frequency offset estimation
Estimate that item can be determined according to design specification or application.In the present embodiment, first filtering parameter can be comprising a signal frequently
Item wide, an attenuation effect estimate item and a Carrier frequency offset estimation, and carrier frequency is taken off before the details of those projects is found in
The explanation of rate skew compensation mechanism 100；
Step S330：The frequency-shift signaling is filtered according to foregoing first filtering parameter, to produce a filtering signal, this
Step can be via a wave filter（The wave filter 130 of such as Fig. 1）To realize；
Step S340：The first interpolation parameters is determined according to foregoing first filtering parameter.In the present embodiment, first interpolation ginseng
The corresponding interpolator output speed of number is relevant to the cut-off frequency corresponding to above-mentioned first filtering parameter, more precisely, the
Interpolator output speed corresponding to one interpolation parameters is identical with the value of the filtering frequency range corresponding to first filtering parameter, so in
Under different design considerations or demand, the value corresponding to two parameter also can be different；
Step S350：Interpolation is carried out to the filtering signal to produce a result according to above-mentioned first interpolation parameters, this
Step can be by an interpolator（The interpolator 140 of such as Fig. 1）To realize；
Step S360：An at least Carrier frequency offset estimation value, this step is produced to be carried using one according to the result
Frequency offset estimator（The carrier frequency shift estimator 150 of such as Fig. 1）To realize, the operation theory of this step is found in
Foregoing reference paper 1；
Step S370：Update foregoing mixing parameter to compensate the load of the input signal according to the Carrier frequency offset estimation value
Frequency offset, this step can pass through a controller（The controller 110 of such as Fig. 1）The frequency mixer that control performs step S310 comes
Realize；
Step S380：Foregoing first filtering parameter is updated to the second filtering parameter, this step according to normal operation setting
Suddenly can pass through a controller（The controller 110 of such as Fig. 1）The wave filter of execution step S330 is controlled to realize.The present embodiment
In, the frequency range corresponding to the second filtering parameter（I.e. one normal frequency range）Equal to the symbol rate of input signal, and the second filtering parameter
Corresponding frequency range is less than the frequency range corresponding to the first filtering parameter（That is an estimation frequency range）；And
Step S390：Foregoing first interpolation parameters is updated to the second interpolation parameters, this step according to normal operation setting
Suddenly can pass through a controller（The controller 110 of such as Fig. 1）The interpolator of execution step S350 is controlled to realize.The present embodiment
In, the interpolator output speed corresponding to the second interpolation parameters（That is a normal speed）Equal to a symbol rate of foregoing input signal
Two times of speed, furthermore, the output speed corresponding to the second interpolation parameters（That is an estimation speed）Foundation uses this
Depending on the system of carrier frequency shift compensation device 100, and for example in the present embodiment, it is somebody's turn to do without directly related with filtering parameter
Output speed uses two times of symbol rates of input signal.
Note that because the art tool usually intellectual see said carrier frequency skew compensation mechanism 100
Explanation fill the carrier frequency shift compensation method that part understands Fig. 3, to exempt from superfluous text, repeat and unnecessary explanation give herein
Memorandum.
In sum, disclosed carrier frequency shift compensation device and method can be inclined in a carrier frequency is obtained
The front and rear of estimate is moved, a wave filter and the different filtering parameter of an interpolator and different interpolation parameterses are given respectively, by
This, though the present invention in the environment of low noise ratio, can also reach with effect similar in the environment of strong noise ratio, in other words
Say, present invention reduces the relevance between noise ratio（Correlation）So that use device of the invention（Such as one
The demodulator of DVB-S systems）For noise than change it is less sensitive, and there is metastable effect.
Although embodiments of the invention as described above, but those embodiments be not used for limiting the present invention, this technology neck
Domain tool usually intellectual can impose change to technical characteristic of the invention according to the content expressed or imply of the invention, it is all this
Many variations may belong to the patent protection category sought by the present invention, and in other words, scope of patent protection of the invention must be regarded
The claim of this specification is defined and is defined.
Claims (17)
1. a kind of carrier frequency shift compensation method, is applied to a communication system, and it includes：
Parameter, one first filtering parameter and one first interpolation parameters is mixed according to one respectively to be successively mixed an input signal
Treatment, filtering process and interpolation processing, to produce a result；
A Carrier frequency offset estimation value of the input signal is calculated according to the result；
The mixing parameter is adjusted according to the Carrier frequency offset estimation value；And
The input signal is entered successively according to mixing parameter, one second filtering parameter and one second interpolation parameters after the adjustment respectively
Row Frequency mixing processing, filtering process and interpolation processing, wherein first interpolation parameters are relevant to corresponding to first filtering parameter
One cut-off frequency.
2. carrier frequency shift compensation method as claimed in claim 1, it is characterised in that first filtering parameter is different from should
Second filtering parameter.
3. carrier frequency shift compensation method as claimed in claim 2, it is characterised in that the corresponding frequency of the first filtering parameter
It is wider than the corresponding frequency range of the second filtering parameter.
4. carrier frequency shift compensation method as claimed in claim 2, it is characterised in that the corresponding frequency of the second filtering parameter
The symbol rate for being relevant to the input signal wide.
5. carrier frequency shift compensation method as claimed in claim 1, it is characterised in that second interpolation parameters is relevant to this
One symbol rate of input signal.
6. carrier frequency shift compensation method as claimed in claim 1, it is characterised in that first filtering parameter includes a letter
Number frequency range and a Carrier frequency offset estimation.
7. carrier frequency shift compensation method as claimed in claim 6, it is characterised in that second filtering parameter does not include should
Carrier frequency offset estimation.
8. carrier frequency shift compensation method as claimed in claim 6, it is characterised in that first filtering parameter also includes
Attenuation effect estimates item.
9. a kind of carrier frequency shift compensation method, is applied to a communication system, and it includes：
Parameter, one first filtering parameter and one first interpolation parameters is mixed according to one respectively to be successively mixed an input signal
Treatment, filtering process and interpolation processing, to produce a result；
A Carrier frequency offset estimation value of the input signal is calculated according to the result；
The mixing parameter is adjusted according to the Carrier frequency offset estimation value；And
The input signal is entered successively according to mixing parameter, one second filtering parameter and one second interpolation parameters after the adjustment respectively
Row Frequency mixing processing, filtering process and interpolation processing,
Wherein, the corresponding frequency range of the first filtering parameter is more than the corresponding frequency range of the second filtering parameter.
10. a kind of carrier frequency shift compensation device, is applied to a communication system, comprising：
One frequency mixer, for carrying out Frequency mixing processing to an input signal, to produce a frequency-shift signaling；
One wave filter, for being filtered treatment to the frequency-shift signaling, to produce a filtering signal；
One interpolator, for carrying out interpolation processing to the filtering signal, to produce an output signal；
One carrier frequency shift estimator, for producing a Carrier frequency offset estimation value according to the output signal；And
One controller, when the Carrier frequency offset estimation value is estimated, makes the wave filter and the interpolator respectively according to one first
Filtering parameter and one first interpolation parameters are operated；When the Carrier frequency offset estimation value is estimated, according to the carrier frequency
Rate bias estimation value adjusts a mixing parameter of the frequency mixer, and the wave filter and the interpolator is filtered according to one second respectively
Parameter and one second interpolation parameters are operated,
Wherein, first interpolation parameters is relevant to the cut-off frequency corresponding to first filtering parameter.
11. carrier frequency shift compensation devices as claimed in claim 10, it is characterised in that first filtering parameter is different from
Second filtering parameter.
12. carrier frequency shift compensation devices as claimed in claim 11, it is characterised in that first filtering parameter is corresponding
Frequency range is more than the corresponding frequency range of the second filtering parameter.
13. carrier frequency shift compensation devices as claimed in claim 11, it is characterised in that second filtering parameter is corresponding
Frequency range is relevant to a symbol rate of the input signal.
14. carrier frequency shift compensation devices as claimed in claim 10, it is characterised in that second interpolation parameters is relevant to
One symbol rate of the input signal.
15. carrier frequency shift compensation devices as claimed in claim 10, it is characterised in that first filtering parameter includes one
Signal frequency range and a Carrier frequency offset estimation.
16. carrier frequency shift compensation devices as claimed in claim 15, it is characterised in that second filtering parameter does not include
The Carrier frequency offset estimation.
17. carrier frequency shift compensation devices as claimed in claim 15, it is characterised in that first filtering parameter is also included
One attenuation effect estimates item.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1791078A (en) * | 2004-12-16 | 2006-06-21 | 上海乐金广电电子有限公司 | Carrier redactor |
| CN101247383A (en) * | 2007-02-13 | 2008-08-20 | 华为技术有限公司 | Method and device for carrier frequency migration estimation |
| CN101778266A (en) * | 2010-01-22 | 2010-07-14 | 凌阳科技股份有限公司 | Blind scanning system and method for DVB-S system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1791078A (en) * | 2004-12-16 | 2006-06-21 | 上海乐金广电电子有限公司 | Carrier redactor |
| CN101247383A (en) * | 2007-02-13 | 2008-08-20 | 华为技术有限公司 | Method and device for carrier frequency migration estimation |
| CN101778266A (en) * | 2010-01-22 | 2010-07-14 | 凌阳科技股份有限公司 | Blind scanning system and method for DVB-S system |
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