CN106059981A - Demodulation method and device - Google Patents
Demodulation method and device Download PDFInfo
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- CN106059981A CN106059981A CN201610466468.9A CN201610466468A CN106059981A CN 106059981 A CN106059981 A CN 106059981A CN 201610466468 A CN201610466468 A CN 201610466468A CN 106059981 A CN106059981 A CN 106059981A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3818—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers
- H04L27/3827—Demodulator circuits; Receiver circuits using coherent demodulation, i.e. using one or more nominally phase synchronous carriers in which the carrier is recovered using only the demodulated baseband signals
Abstract
The embodiment of the invention discloses a demodulation method, comprising the steps of acquiring baseband signals after demodulating sampling data; processing the baseband signals in parallel, determining n groups of parallel baseband signal sequences, wherein a clock frequency of the baseband signal sequences is 1/n of a sampling block frequency, and n is an integer more than 2; and filtering the n groups of parallel baseband signal sequences, and acquiring demodulated output signals with the clock frequency the same as the clock frequency of the baseband signal sequences. The embodiment of the invention also discloses a demodulation device at the same time.
Description
Technical field
The present invention relates to signal processing field, particularly relate to a kind of demodulation method and device.
Background technology
Along with the development of digital signal, the application of modulation and demodulation is more and more extensive, such as wireless in radiotechnics
In telecommunication, broadcast, TV, mobile phone, computer and the Internet, modulation and demodulation occupies highly important status.Without tune
System and demodulation techniques, would not produce above-mentioned radiotechnics.Demodulation techniques therein will be furtherd investigate by the present invention.
In existing demodulation techniques, first signal is carried out sampling processing, the most again signal is carried out quadrature demodulation, finally
Demodulated signal is carried out 2 and takes out the extraction process of 1.After this three step, after gained demodulation, the clock frequency of signal becomes sampling
The half of frequency, and after now gained demodulation, the clock frequency of signal is the highest, and the reliability that system works can be caused with steady
Qualitative poor.
Summary of the invention
For solving above-mentioned technical problem, embodiment of the present invention expectation provides a kind of demodulation method and device, and the method is logical
Cross the quadrature demodulation of the complete pair signals of method for parallel processing, it is possible to obtain than traditional method more in the case of identical sample frequency
The clock frequency of signal after low demodulation, thus improve the reliability and stability of system work.
The technical scheme is that and be achieved in that:
On the one hand, it is provided that a kind of demodulation method, described method includes:
Obtain the baseband signal after demodulation sampled data；
Baseband signal described in parallel processing, determines the baseband signal sequence that n group is parallel, the clock of described baseband signal sequence
Frequency is the 1/n of sample clock frequency, and described n is the natural number more than 2；
Filter the baseband signal sequence that described n group is parallel, it is thus achieved that clock frequency and described baseband signal sequential clock frequency
Identical demodulated output signal.
Preferably, baseband signal described in described parallel processing, determine that the parallel baseband signal sequence of n group includes:
With described n as cycle, described baseband signal is divided into the baseband signal sequence that n group is parallel.
Preferably, the baseband signal sequence that described filtering described n group is parallel, it is thus achieved that clock frequency and described baseband signal sequence
The demodulated output signal that column clock frequency is identical includes:
By the baseband signal sequence that n group described in n new filter filtering is parallel, it is thus achieved that described demodulated output signal,
There is corresponding relation in wave filter new for the described n baseband signal sequence parallel with described n group.
Preferably, the described baseband signal sequence parallel by n group described in n new filter filtering, it is thus achieved that described solution
Before adjusting output signal, described method also includes:
Obtaining the coefficient sequence of m rank wave filter, described m is the integral multiple of described n；
With described n as cycle, the coefficient of described m rank wave filter is divided into the coefficient sequence that n group is new；
According to the coefficient sequence that described n group is new, determine described n new wave filter；
Using coefficient sequence new for described n group as the coefficient sequence of n new wave filter.
Preferably, described demodulation sampled data is sampled data described in quadrature demodulation.
On the other hand, it is provided that a kind of demodulating equipment, described device includes:
Acquisition module, the baseband signal after obtaining demodulation sampled data；
Processing module, for baseband signal described in parallel processing, determines the baseband signal sequence that n group is parallel, described base band
The clock frequency of signal sequence is the 1/n of sample clock frequency, and described n is the natural number more than 2；
Filtration module, for filtering the baseband signal sequence that described n group is parallel, it is thus achieved that clock frequency and described baseband signal
The demodulated output signal that sequential clock frequency is identical.
Preferably, described processing module is additionally operable to:
With described n as cycle, described baseband signal is divided into the baseband signal sequence that n group is parallel.
Preferably, described filtration module is additionally operable to:
By the baseband signal sequence that n group described in n new filter filtering is parallel, it is thus achieved that described demodulated output signal,
There is corresponding relation in wave filter new for the described n baseband signal sequence parallel with described n group.
Preferably, described device also includes:
Described acquisition module is additionally operable to obtain the coefficient sequence of m rank wave filter, and described m is the integral multiple of described n；
Divide module, for described n as cycle, the coefficient of described m rank wave filter is divided into the coefficient sequence that n group is new
Row；
Determine module, for the coefficient sequence new according to described n group, determine described n new wave filter；
Generation module, for the coefficient sequence using coefficient sequence new for described n group as n new wave filter.
Preferably, described acquisition module is additionally operable to sampled data described in quadrature demodulation.
Embodiments provide a kind of demodulation method and device, first obtain the baseband signal after demodulation sampled data；
Then, parallel processing baseband signal, determine the baseband signal sequence that n group is parallel, the clock frequency of baseband signal sequence is sampling
The 1/n of clock frequency, n are the natural number more than 2；Afterwards, the filtering parallel baseband signal sequence of n group, it is thus achieved that clock frequency and
The demodulated output signal that baseband signal sequential clock frequency is identical.So, by the parallel processing to baseband signal, can obtain
To the parallel baseband signal sequence that n group clock frequency is sample clock frequency 1/n, and then when obtaining identical with baseband signal sequence
The demodulated output signal of clock frequency rate, the clock frequency of the demodulated output signal being achieved in that is determined by user, and user passes through
Choose the group number n of parallel processing, just can get the demodulated output signal that clock frequency is sample clock frequency 1/n, thus solve
The problem that output signal clock frequency is sample clock frequency half that conventional demodulation techniques of having determined only obtains, it is possible to adopt identical
Obtain the clock frequency of signal after the demodulation lower than traditional method in the case of sample frequency, thus improve the reliable of system work
Property and stability.
Accompanying drawing explanation
The flow chart of a kind of demodulation method that Fig. 1 provides for the embodiment of the present invention；
Fig. 2 is that baseband signal 2 is taken out the schematic diagram of 1 processing procedure by prior art；
Fig. 3 is the schematic diagram of typical Orthogonal demodulating process；
Fig. 4 is a kind of simplification figure of Fig. 3；
The schematic diagram of a kind of filtering that Fig. 5 provides for the embodiment of the present invention；
The flow chart of the another kind of demodulation method that Fig. 6 provides for the embodiment of the present invention；
The sequential chart of a kind of sampled data output that Fig. 7 provides for the embodiment of the present invention；
Fig. 8 is converted into the sequential chart on single edge for a kind of double edges that the embodiment of the present invention provides；
The sequential chart of output after a kind of parallel processing that Fig. 9 provides for the embodiment of the present invention；
The structural representation of a kind of demodulating equipment that Figure 10 provides for the embodiment of the present invention；
The structural representation of the another kind of demodulating equipment that Figure 11 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe wholely.
Embodiment one
The embodiment of the present invention provides a kind of demodulation method, is applied to demodulating equipment, and this device can be in server
Part, it is also possible to be single equipment, as it is shown in figure 1, the method includes:
Baseband signal after step 101, acquisition demodulation sampled data.
Various physical quantitys in actual production life, the lower sound of the image photographed such as camera, recorder record, workshop are controlled
Pressure that room processed is recorded, flow, rotating speed, humidity etc. are all analogue signals.And computer carries out processing these for convenience
Analogue signal, or be transmitted these analogue signals by the Internet, all i.e. can be simulated first by analogue signal discretization/
The conversion of digital signal.In this transformation process, can intactly retain primary signal for the digital signal after keeping sampling
In information, sample frequency should be greater than or equal in signal 2 times of highest frequency, this is the rule that sampling process should be followed
Rule, i.e. meets sampling thheorem.
Demodulation is the process recovering message from the modulated signal carrying message.In the transmission of various information or processing system
In, carrier wave is modulated by the message that transmitting terminal to be transmitted, and produces the signal carrying this message.Receiving terminal must recover
The message transmitted just can be used, here it is demodulation.
Here, first original analog is carried out sampling processing, form the digital signal of pretreatment, then to this pretreatment
Digital signal carries out quadrature demodulation, obtains the baseband signal that two-way is mutually orthogonal.
Concrete, primary signal is to be applied to radar microwave remote sensing fields, particularly satellite-borne synthetic aperture radar field
Intermediate-freuqncy signal, first according to sampling thheorem, carries out sliding-model control, forms the digital signal of pretreatment this intermediate-freuqncy signal；Connect
, the digital signal of this pretreatment is multiplied by respectively orthogonal two local oscillation signal, obtains the baseband signal that two-way is mutually orthogonal.
Preferably, two local oscillator sequences be respectively cos (n π)=[0 ,-1,0,1,0 ,-1 ...] and sin (n π)=[-1,0,1,0 ,-1,
0,…]。
Synthetic aperture radar is a kind of high-resolution imaging radar, can obtain class under the meteorological condition that visibility is extremely low
Like photo-optical high resolution radar image.Radar is utilized with the relative motion of target, real antenna aperture less for size to be used
The radar in the method synthesis one bigger equivalent aerial aperture that data process, also referred to as synthetic aperature radar.Synthetic aperture radar has
There is resolution high, energy all weather operations, camouflage can be efficiently identified and penetrate the feature of cloak.
What deserves to be explained is, the original analog in the present embodiment is not limited solely to intermediate-freuqncy signal, it is also possible to be to penetrate
Frequently the other kinds of signal such as signal.
Example, it is assumed that the digital signal of the pretreatment obtained after original analog sampling is s={d0,d1,d2,d3,
d4,d5,d6,d7... }, the digital signal s of this pretreatment is multiplied by respectively above-mentioned two local oscillation signal cos (n π)=[0 ,-1,
0,1,0 ,-1 ...] and sin (n π)=[-1,0,1,0 ,-1,0 ...] obtain the baseband signal that two-way is mutually orthogonal: sI=0 ,-
d1,0,d3,0,-d5,0,d7... } and sQ={-d0,0,d2,0,-d4,0,d6,0,...}。
Step 102, parallel processing baseband signal, determine the baseband signal sequence that n group is parallel.
Here, the clock frequency of baseband signal sequence is the 1/n of baseband signal clock frequency, and n is the natural number more than 2.
Concrete, with n as cycle, baseband signal is divided into the baseband signal sequence that n group is parallel.
In the prior art, as in figure 2 it is shown, be baseband signal to be carried out 2 take out 1 process so that demodulated output signal
Clock frequency becomes the half of sample clock frequency.
In actual treatment, the present invention is that baseband signal is divided into the baseband signal sequence that n group is parallel, can be substantially reduced
The clock frequency processed.
In the present embodiment, it is preferred that n takes 4.Example, it is assumed that the base that the two-way that obtains in a step 101 is mutually orthogonal
Band signal is sIAnd sQ, existing respectively by sIAnd sQIt is divided into 4 groups of parallel baseband signals, so that it may obtain 4 groups of clocks with 4 for the cycle
Frequency is the baseband signal sequence of sample frequency 1/4.For sI, extract s simultaneouslyIThe point of 4k, 4k+1,4k+2, and 4k+3,
Forming 4 parallel signal sequences, wherein k is natural number, is respectively as follows: sI0=0,0,0 ... }, sI1={-d1,-d5,-
d9,...}、sI2=0,0,0 ... } and sI3={ d3,d7,d11,...}；After the same method, sQ4 the signal sequences formed
Row are respectively as follows: sQ0={-d0,-d4,-d8,...}、sQ1=0,0,0 ... }, sQ2={ d2,d6,d10... } and sQ3=0,0,
0,...}；
The baseband signal sequence that step 103, filtering n group are parallel, it is thus achieved that clock frequency and base band signal sequential clock
The demodulated output signal that frequency is identical.
Concrete, by the baseband signal sequence that n new filter filtering n group is parallel, it is thus achieved that demodulated output signal, n
There is corresponding relation in the parallel baseband signal sequence of individual new wave filter and n group.
Here, demodulating process generally comprises two key links: first, carries useful information being positioned at nearby carriers
Frequency spectrum shift is in base band；Second, leach baseband signal with corresponding wave filter, thus complete demodulation tasks.Step 101 is
Completing the first key link, this step will process for the second key link.Example, as a example by intermediate-freuqncy signal,
As it is shown on figure 3, wherein, IF input represents intermediate-freuqncy signal input to quadrature demodulation process；ADC represents the conversion of analog/digital signal；
NCO represents digital oscillator；I, Q represent the baseband signal that two-way is mutually orthogonal.What deserves to be explained is, when sample frequency fs, former
Beginning analogue signal bandwidth B, IF-FRE f0Between meet the first relation time, Fig. 3 can be reduced to Fig. 4, in the diagram, s (t) table
Show original analog；AD represents the conversion of analog/digital signal；S (n) represents the digital signal of pretreatment；sI(n) and sQ(n)
Represent mutually orthogonal two-way baseband signal；LPF represents low pass filter；I (m) and Q (m) is demodulated output signal, wherein, and t
For nonnegative number；N, m are natural number.Here, described first relation is:
Wherein, M is natural number.
Concrete, this step is i.e. the operation to second key link.Filter garbage signal by wave filter, thus obtain
To useful baseband signal.In the present embodiment, owing to step 102 has carried out parallel processing to baseband signal, therefore n group can be there is also
The baseband signal sequence of row, is the most now accomplished by the baseband signal sequence difference that n new filter filtering is parallel to this n group
It is filtered, thus completes demodulating process.
Before step 103, described method also includes: obtaining the coefficient sequence of m rank wave filter, m is the integral multiple of n；With n
For the cycle, the coefficient of m rank wave filter is divided into the coefficient sequence that n group is new；According to the coefficient sequence that n group is new, determine that n is individual new
Wave filter is using coefficient sequence new for n group as the coefficient sequence of n new wave filter.
Here, filter coefficient refers to the weighting of the different delayed time component to varying input signal.The most
Determine the baseband signal sequence that n group is parallel, the baseband signal sequence that this n group is parallel be filtered by step 103, then, phase
The baseband signal sequence that this n group is parallel is filtered by n the new wave filter that be accomplished by respectively that answer.
Concrete, first determine a m rank wave filter；Then, the coefficient sequence of this m rank wave filter is obtained；Afterwards, with n as week
Phase, the coefficient of m rank wave filter is divided into the coefficient sequence that n group is new；Finally, new respectively as n by the coefficient sequence that n group is new
The coefficient sequence of wave filter, the n needed for formation new wave filter.
Example, first, determine that there is limit for length unit impulse response wave filter (Finite Impulse on one 64 rank
Response, FIR), the coefficient of this 64 rank FIR filter is Fir16:{h0, h1, h2, h3 ..., h63}.In integrating step 102
Respectively by sIAnd sQIt is divided into 4 groups of parallel baseband signals, the value of n and the value of n in step 102 in this step with 4 for the cycle
Being identical, representative implication is also the same.Then, the coefficient of 64 rank FIR filter is divided into the coefficient sequence that n group is new
Row, respectively Fir16_1:{h0, h4, h8, h12 ..., h60}, Fir16_2:{h1, h5, h9, h13 ..., h61}, Fir16_3:
H2, h6, h10, h14 ..., h62} and Fir16_4:{h3, h7, h11, h15 ..., h63}；Finally, by these 4 groups new coefficient sequences
Arrange the coefficient sequence respectively as 4 new wave filter, 4 new wave filter needed for formation.This filtering such as Fig. 5 institute
Show, wherein, Z-1Represent that list entries postpones a clock cycle；DI_odd_sign represents I road signal odd point；DI_even_
Sign represents I road signal even number point；DId_odd_sign represents Q road signal odd point；DId_even_sign represents Q road signal
Even number point；I and Q is the demodulated output signal that two-way is mutually orthogonal.
Described method also includes: demodulation sampled data is quadrature demodulation sampled data.
Wireless communication technology development is very swift and violent, and the modulator approach of various communication systems is also a lot, such as amplitude modulation, frequency modulation, tune
Equal, regardless of the modulation system used, can first use quadrature demodulation, process according to modulation system the most again and recover letter
Number.In order to improve the availability of frequency spectrum, communication system is frequently with orthogonal modulation.
Example, in radar receiver, the mutually orthogonal demodulated output signal of two-way that quadrature demodulation goes out can be by identical
The carrier wave additional combining of carrier wave and 90 degree of phase shifts, relatively good realization.What deserves to be explained is, the demodulation method of the present invention
It is also adapted to other and relates to if sampling orthogonal demodulation system.
So, by the parallel processing to baseband signal, available n group clock frequency is sample clock frequency 1/n
Parallel baseband signal sequence, and then obtain clock frequency identical with baseband signal sequence demodulated output signal, be achieved in that
The clock frequency of demodulated output signal determined by user, user is by choosing the group number n of parallel processing, when just can get
Clock frequency rate is the demodulated output signal of sample clock frequency 1/n, this addresses the problem the output letter that conventional demodulation techniques only obtains
Number clock frequency is the problem of sample clock frequency half, it is possible to obtain than traditional method more in the case of identical sample frequency
The clock frequency of signal after low demodulation, thus improve the reliability and stability of system work.
Embodiment two
The embodiment of the present invention provides a kind of demodulation method, is applied to demodulating equipment, with intermediate-freuqncy signal four tunnel parallel processing
As a example by quadrature demodulation, as shown in Figure 6, the method includes:
Step 201, acquisition intermediate-freuqncy signal and 4 new wave filter.
Concrete, the FIR filter of low-pass digital filter uses 64 rank, and coefficient is Fir16:{h0, h1, h2, h3 ...,
H63}, being extracted is that 4 groups of new coefficient sequence are respectively Fir16_1:{h0, h4, h8, h12 ..., h60}, Fir16_2:
H1, h5, h9, h13 ..., and h61}, Fir16_3:{h2, h6, h10, h14 ..., h62} and Fir16_4:{h3, h7, h11,
H15 ..., h63}.By these 4 groups of new coefficient sequence respectively as the coefficient sequence of 4 new wave filter, 4 needed for formation
New wave filter.
Step 202, intermediate-freuqncy signal is inputted if signal sampling data shaper, it is thus achieved that sampled data.
The present embodiment is if sampling data shaper based on 533.33MHz sampling, and sampling A/D chip has 1:
2DeMux is double along output function, and sampled data output timing is as it is shown in fig. 7, in Fig. 7, DI, Did respectively odd number, even number point are adopted
Sample data.
Here, double refer to that the rising edge of clock and trailing edge are effective edge along output function.What deserves to be explained is, this reality
Execute that select in example is the if sampling data shaper of 533.33MHz sampling, but actual be not limited solely to this when choosing, its
He has the chip of similar function and also may be used.
Step 203, quadrature demodulation sampled data, it is thus achieved that baseband signal.
Demodulation is the inverse process of modulation, and its effect is to take out original modulated signal from modulated wave signal.Demodulated
Journey generally comprises two key links: first carry the frequency spectrum shift of useful information in base band, so being positioned at nearby carriers
Leach baseband signal with corresponding wave filter afterwards, complete demodulation tasks.
In radiotechnics, modulation and demodulation occupies highly important status.Were it not for modulation and demodulation technology, just
Not having radio communication, broadcast and TV, do not have the BP paging of today, hand-held phone, fax, compunlcation and interconnection yet
Net.
Here, the quadrature demodulation of sampled data is by field programmable gate array (Field Programmable Gate
Array, FPGA) realize.
Concrete, first fpga chip is converted into single edge parallel, four tunnels by double for two-way along sampled data after receiving sampled data
Data, after conversion, sequential is as shown in Figure 8.
Step 204, parallel processing baseband signal, determine parallel baseband signal sequence.
Parallel processing digital optical mixing process is by DI_even and DId_even sequence is multiplied by-1 realization, result such as Fig. 9 institute
Showing, wherein DI_even_sign represents I road signal even number point；DId_even_sign represents Q road signal even number point.
Concrete, for sI, extract s simultaneouslyIThe point of 4k, 4k+1,4k+2, and 4k+3, form parallel 4 signal
Sequence, wherein k is natural number, is respectively as follows: sI0=0,0,0 ... }, sI1={-d1,-d5,-d9,...}、sI2=0,0,
0 ... } and sI3={ d3,d7,d11,...}；After the same method, sQ4 signal sequences formed are respectively as follows: sQ0=-
d0,-d4,-d8,...}、sQ1=0,0,0 ... }, sQ2={ d2,d6,d10... } and sQ3=0,0,0 ... }.
Step 205, signal calculated sequence and new coefficient sequence convolution and.
Example, as a example by the signal odd point sequence of I road, its convolution and be: IVery=sI1*Fir16_4+sI3*Fir16_2。
Equally, I road signal even number point signal sequence IEven, Q road signal odd point signal sequence QVery, Q road signal even number point signal sequence QEven
All can be realized by identical convolutional filtering, the most no longer describe in detail.
Step 206, according to signal sequence and new coefficient sequence convolution and, obtain demodulated output signal.
4 groups of signals obtained by step 205 are carried out orderly combination by practical significance, finally gives demodulation output letter
Number.This demodulated output signal is the 1/4 of sample clock frequency, is 133.33MHz.
So, by the parallel processing to baseband signal, available n group clock frequency is sample clock frequency 1/n
Parallel baseband signal sequence, and then obtain clock frequency identical with baseband signal sequence demodulated output signal, be achieved in that
The clock frequency of demodulated output signal determined by user, user is by choosing the group number n of parallel processing, when just can get
Clock frequency rate is the demodulated output signal of sample clock frequency 1/n, this addresses the problem the output letter that conventional demodulation techniques only obtains
Number clock frequency is the problem of sample clock frequency half, it is possible to obtain than traditional method more in the case of identical sample frequency
The clock frequency of signal after low demodulation, thus improve the reliability and stability of system work.
Embodiment three
The embodiment of the present invention provides a kind of demodulating equipment 30, and as shown in Figure 10, this device 30 includes:
Acquisition module 301, the baseband signal after obtaining demodulation sampled data；
Processing module 302, for baseband signal described in parallel processing, determines the baseband signal sequence that n group is parallel, described base
The clock frequency of band signal sequence is the 1/n of sample clock frequency, and described n is the natural number more than 2；
Filtration module 303, for filtering the baseband signal sequence that described n group is parallel, it is thus achieved that clock frequency and described base band
The demodulated output signal that signal sequence clock frequency is identical.
So, by the parallel processing to baseband signal, available n group clock frequency is sample clock frequency 1/n
Parallel baseband signal sequence, and then obtain clock frequency identical with baseband signal sequence demodulated output signal, be achieved in that
The clock frequency of demodulated output signal determined by user, user is by choosing the group number n of parallel processing, when just can get
Clock frequency rate is the demodulated output signal of sample clock frequency 1/n, this addresses the problem the output letter that conventional demodulation techniques only obtains
Number clock frequency is the problem of sample clock frequency half, it is possible to obtain than traditional method more in the case of identical sample frequency
The clock frequency of signal after low demodulation, thus improve the reliability and stability of system work.
Concrete, described processing module 302 is additionally operable to described n as cycle, described baseband signal is divided into n group parallel
Baseband signal sequence.
Described filtration module 303 is additionally operable to the baseband signal sequence parallel by n group described in n new filter filtering,
Obtain described demodulated output signal, the corresponding pass of baseband signal sequence existence that described n new wave filter is parallel with described n group
System.
Described acquisition module 301 is additionally operable to obtain the coefficient sequence of m rank wave filter, and described m is the integral multiple of described n.
As shown in figure 11, described device 30 also includes:
Divide module 304, for described n as cycle, the coefficient of described m rank wave filter is divided into the coefficient that n group is new
Sequence；
Determine module 305, for the coefficient sequence new according to described n group, determine described n new wave filter
Generation module 306, for the coefficient sequence using coefficient sequence new for described n group as n new wave filter.
Further, described acquisition module 301 is additionally operable to sampled data described in quadrature demodulation.
In actual applications, described acquisition module 301, processing module 302, filtration module 303, divide module 304, determine
Module 305 and generation module 306 all can be by central processing unit (the Central Processing being positioned in demodulating equipment 30
Unit, CPU), microprocessor (Micro Processor Unit, MPU), digital signal processor (Digital Signal
Processor, DSP) or field programmable gate array (Field Programmable Gate Array, FPGA) etc. realize.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the shape of the embodiment in terms of the present invention can use hardware embodiment, software implementation or combine software and hardware
Formula.And, the present invention can use can be with storage at one or more computers wherein including computer usable program code
The form of the upper computer program implemented of medium (including but not limited to disk memory and optical memory etc.).
The present invention is with reference to method, equipment (system) and the flow process of computer program according to embodiments of the present invention
Figure and/or block diagram describe.It should be understood that can the most first-class by computer program instructions flowchart and/or block diagram
Flow process in journey and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
Instruction arrives the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce
A raw machine so that the instruction performed by the processor of computer or other programmable data processing device is produced for real
The device of the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame now.
These computer program instructions may be alternatively stored in and computer or other programmable data processing device can be guided with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in this computer-readable memory produces and includes referring to
Make the manufacture of device, this command device realize at one flow process of flow chart or multiple flow process and/or one square frame of block diagram or
The function specified in multiple square frames.
These computer program instructions also can be loaded in computer or other programmable data processing device so that at meter
Perform sequence of operations step on calculation machine or other programmable devices to produce computer implemented process, thus at computer or
The instruction performed on other programmable devices provides for realizing at one flow process of flow chart or multiple flow process and/or block diagram one
The step of the function specified in individual square frame or multiple square frame.
The above, only presently preferred embodiments of the present invention, it is not intended to limit protection scope of the present invention.
Claims (10)
1. a demodulation method, it is characterised in that described method includes:
Obtain the baseband signal after demodulation sampled data；
Baseband signal described in parallel processing, determines the baseband signal sequence that n group is parallel, the clock frequency of described baseband signal sequence
It is the natural number more than 2 for the 1/n of sample clock frequency, described n；
Filter the baseband signal sequence that described n group is parallel, it is thus achieved that clock frequency is identical with described baseband signal sequential clock frequency
Demodulated output signal.
Method the most according to claim 1, it is characterised in that baseband signal described in described parallel processing, determines that n group is parallel
Baseband signal sequence include:
With described n as cycle, described baseband signal is divided into the baseband signal sequence that n group is parallel.
Method the most according to claim 1, it is characterised in that the baseband signal sequence that described filtering described n group is parallel, obtains
The demodulated output signal obtaining clock frequency identical with described baseband signal sequential clock frequency includes:
By the baseband signal sequence that n group described in n new filter filtering is parallel, it is thus achieved that described demodulated output signal, described n
There is corresponding relation in the parallel baseband signal sequence of individual new wave filter and described n group.
Method the most according to claim 3, it is characterised in that described parallel by n group described in n new filter filtering
Baseband signal sequence, it is thus achieved that before described demodulated output signal, described method also includes:
Obtaining the coefficient sequence of m rank wave filter, described m is the integral multiple of described n；
With described n as cycle, the coefficient of described m rank wave filter is divided into the coefficient sequence that n group is new；
According to the coefficient sequence that described n group is new, determine described n new wave filter；
Using coefficient sequence new for described n group as the coefficient sequence of n new wave filter.
5. according to the method described in Claims 1-4 any one claim, it is characterised in that described demodulation sampled data
It it is sampled data described in quadrature demodulation.
6. a demodulating equipment, it is characterised in that described device includes:
Acquisition module, the baseband signal after obtaining demodulation sampled data；
Processing module, for baseband signal described in parallel processing, determines the baseband signal sequence that n group is parallel, described baseband signal
The clock frequency of sequence is the 1/n of sample clock frequency, and described n is the natural number more than 2；
Filtration module, for filtering the baseband signal sequence that described n group is parallel, it is thus achieved that clock frequency and described baseband signal sequence
The demodulated output signal that clock frequency is identical.
Device the most according to claim 6, it is characterised in that described processing module is additionally operable to:
With described n as cycle, described baseband signal is divided into the baseband signal sequence that n group is parallel.
Device the most according to claim 6, it is characterised in that described filtration module is additionally operable to:
By the baseband signal sequence that n group described in n new filter filtering is parallel, it is thus achieved that described demodulated output signal, described n
There is corresponding relation in the parallel baseband signal sequence of individual new wave filter and described n group.
Device the most according to claim 8, it is characterised in that described device also includes:
Described acquisition module is additionally operable to obtain the coefficient sequence of m rank wave filter, and described m is the integral multiple of described n；
Divide module, for described n as cycle, the coefficient of described m rank wave filter is divided into the coefficient sequence that n group is new；
Determine module, for the coefficient sequence new according to described n group, determine described n new wave filter；
Generation module, for the coefficient sequence using coefficient sequence new for described n group as n new wave filter.
10. according to the device described in claim 6 to 9 any one claim, it is characterised in that described acquisition module is also used
In sampled data described in quadrature demodulation.
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