CN105306077B - signal decoding method and device - Google Patents
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- CN105306077B CN105306077B CN201410262119.6A CN201410262119A CN105306077B CN 105306077 B CN105306077 B CN 105306077B CN 201410262119 A CN201410262119 A CN 201410262119A CN 105306077 B CN105306077 B CN 105306077B
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Abstract
The invention discloses a kind of signal decoding method and device, belongs to logging technique field.This method includes：Auto-correlation computation is carried out to the signal received, noise signal is removed, obtains the first signal；Zero-tracking is carried out to the first signal, null offset is removed, obtains secondary signal；The signal amplitude of secondary signal is adjusted, obtains the 3rd signal；Adjust the phase and frequency of local signal frame code so that with the 3rd signal frame synchronization, the frame starting point using frame starting point as the 3rd signal；Adjust local signal symbol so that with the 3rd signal bit synchronization, the position starting point using position starting point as the 3rd signal；Since the starting point of the 3rd signal, the signal in a cycle is obtained, the signal in a cycle and existing signal waveform collection are subjected to related operation, the waveform for determining the 3rd signal is concentrated from existing signal waveform, realizes decoding.Even if receiver receives, signal intensity is faint, or even during the low signal of signal to noise ratio, also signal accurately can be decoded.
Description
Technical field
The present invention relates to logging technique field, more particularly to a kind of signal decoding method and device.
Background technology
Measurement while drilling instrument is in drilling process, by the use of drilling fluid or electromagnetic signal channel as transmission medium, is continuously transmitted
The survey tool of measurement signal, the instrument can measure the geologic parameter and engineering parameter at nearly drill bit in real time.
With promoting the use of for the technologies such as gas drilling and under balance pressure drilling, the mt formed with drill string, stratum is believed
Road is the EMMWD (Electromagnetic Measurement While Drilling, electromagnetic measurement while drilling) of transmission medium
Instrument gradually attracts people's attention, the instrument have signaling rate is high, do not need circulating fluid can transmit data,
The features such as time of measuring is short, cost is low.
Due to being a special channel with the mt channel on stratum and drill string composition, it is to the height in transmission signal
The decay of frequency signal is very violent so that the signal frequency that ground receiver arrives is very low, wherein the useful signal included is also very
It is faint, therefore EMMWD signal transmission depth is shorter, and limitation is caused using depth to EMMWD underground.
At present, how EMMWD small-signal is decoded so that EMMWD signal transmission depth increases, and turns into pendulum
A challenge in face of people.
The content of the invention
In order to solve problem of the prior art, the embodiments of the invention provide a kind of signal decoding method and device.It is described
Technical scheme is as follows：
On the one hand, there is provided a kind of signal decoding method, methods described include：
Auto-correlation computation is carried out to received signal, the noise signal in the signal is removed, obtains the first signal；
Zero-tracking is carried out to first signal, the null offset of first signal is removed, obtains secondary signal；
The signal amplitude of the secondary signal is adjusted, obtains the 3rd signal, the signal amplitude of the 3rd signal
Within a preset range；
Adjust the phase and frequency of local signal frame code so that the local signal and the 3rd signal frame synchronization, will
Frame starting point of the frame starting point of the local signal as the 3rd signal；
Adjust local signal symbol so that the local signal and the 3rd signal bit synchronization, by the local signal
Position starting point of the position starting point as the 3rd signal；
Since the starting point of the 3rd signal, the signal in a cycle is obtained, by the letter in one cycle
Number related operation is carried out with existing signal waveform collection, the waveform for determining the 3rd signal is concentrated from the existing signal waveform,
The 3rd signal is decoded based on identified waveform.
On the other hand, there is provided a kind of signal decoding apparatus, described device include：
Signal recognition module, for carrying out auto-correlation computation to received signal, remove the noise in the signal
Signal, obtain the first signal；
Zero-tracking module, for carrying out Zero-tracking to first signal, remove the zero point drift of first signal
Move, obtain secondary signal；
Signal amplitude control module, for being adjusted to the signal amplitude of the secondary signal, obtain the 3rd signal, institute
State the signal amplitude of the 3rd signal within a preset range；
Synchronization module, for adjusting the phase and frequency of local signal frame code so that the local signal and the described 3rd
Signal frame synchronization, the frame starting point using the frame starting point of the local signal as the 3rd signal；Adjust local signal code
Member so that the local signal and the 3rd signal bit synchronization, using the position starting point of the local signal as the described 3rd
The position starting point of signal；
Demodulation module, for since the starting point of the 3rd signal, the signal in a cycle being obtained, by described one
Signal in the individual cycle carries out related operation with existing signal waveform collection, is concentrated from the existing signal waveform and determines the described 3rd
The waveform of signal, the 3rd signal is decoded based on identified waveform.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
By carrying out auto-correlation computation to reception signal, cancelling noise signal, useful signal is obtained, then successively to useful
Signal is removed null offset, adjusts signal amplitude, identify starting point, determine signal waveform, being solved based on identified waveform
Code so that signal intensity is faint even if receiver receives, or even during the low signal of signal to noise ratio, can also be carried out to this kind of signal accurate
Really decoding.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is signal decoding method flow chart provided in an embodiment of the present invention；
Fig. 2 is receiver structure schematic diagram provided in an embodiment of the present invention；
Fig. 3 is signal decoding method flow chart provided in an embodiment of the present invention；
Fig. 4 is frame synchronization schematic diagram provided in an embodiment of the present invention；
Fig. 5 is bit synchronization schematic diagram provided in an embodiment of the present invention；
Fig. 6 is the structural representation of Correlation Demodulator provided in an embodiment of the present invention；
Fig. 7 is signal decoding apparatus structural representation provided in an embodiment of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 1 is signal decoding method flow chart provided in an embodiment of the present invention.Referring to Fig. 1, the embodiment includes：
101st, auto-correlation computation is carried out to received signal, removes the noise signal in the signal, obtain the first letter
Number.
102nd, Zero-tracking is carried out to first signal, removes the null offset of first signal, obtain secondary signal.
103rd, the signal amplitude of the secondary signal is adjusted, obtains the 3rd signal, the signal amplitude of the 3rd signal
Within a preset range.
104th, the phase and frequency of local signal frame code is adjusted so that the local signal and the 3rd signal frame are same
Step, the frame starting point using the frame starting point of the local signal as the 3rd signal.
105th, local signal symbol is adjusted so that the local signal and the 3rd signal bit synchronization, by the local
Position starting point of the position starting point of signal as the 3rd signal.
106th, since the starting point of the 3rd signal, the signal in a cycle is obtained, by the letter in a cycle
Number related operation is carried out with existing signal waveform collection, have signal waveform from this and concentrate and determine the waveform of the 3rd signal, be based on
Identified waveform decodes to the 3rd signal.
Method provided in an embodiment of the present invention, by carrying out auto-correlation computation to reception signal, cancelling noise signal, obtain
Useful signal, then successively to useful signal remove null offset, adjust signal amplitude, identify starting point, determine signal waveform,
Decoded based on identified waveform so that even if receiver receives, signal intensity is faint, or even the signal that signal to noise ratio is low
When, also this kind of signal can accurately be decoded.
Alternatively, the signal amplitude of the secondary signal is adjusted, obtaining the 3rd signal includes：
When the signal amplitude of the secondary signal is more than first threshold, the signal amplitude of the secondary signal is multiplied by the first system
Number so that the signal amplitude of the 3rd signal is within a preset range；
When the signal amplitude of the secondary signal is less than Second Threshold, the signal amplitude of the secondary signal is multiplied by the second system
Number so that within a preset range, first coefficient is less than second coefficient to the signal amplitude of the 3rd signal.
Alternatively, since the starting point of the 3rd signal, the signal in a cycle is obtained, by a cycle
Signal carries out related operation with existing signal waveform collection, has the waveform of signal waveform concentration the 3rd signal of determination, base from this
Carrying out decoding to the 3rd signal in identified waveform includes：
Since the starting point of the 3rd signal, the signal in a cycle is obtained；
It is N-dimensional vector by the signal decomposition in a cycle；
By each vector in N-dimensional vector, have signal waveform collection with this respectively and carry out related operation, obtain vectorial r
=[r1,r2,…,rN], wherein, riRelated operation is carried out for i-th of vector in N-dimensional vector r and the existing signal waveform collection
Value, N, i are natural number；
By being made decisions to the vectorial r, has the waveform of signal waveform concentration the 3rd signal of determination from this, based on institute
The waveform of determination decodes to the 3rd signal.
The executive agent of the embodiment of the present invention is receiver, the receiver include signal recognition module, Zero-tracking module,
Signal amplitude control module, synchronization module and demodulation module.Wherein, the signal recognition module is used to remove making an uproar in reception signal
Acoustical signal, the Zero-tracking module are used to remove null offset, and the signal amplitude control module is used for the model of control signal amplitude
Enclose, the synchronization module is used for the starting point for identifying reception signal, and the demodulation module is used for the waveform for determining reception signal, based on institute
The waveform of determination decodes to the 3rd signal.The structural representation of receiver as shown in Figure 2.In fig. 2, the signal recognition
When module receives signal, remove the noise signal in the signal, obtain the first signal, and by first signal to the zero point with
Track module is sent so that the Zero-tracking module removes the null offset of first signal, obtains secondary signal.When the signal width
When degree control module receives the secondary signal of Zero-tracking module transmission, the signal amplitude of the secondary signal is adjusted
It is whole, the 3rd signal is obtained, and the 3rd signal is controlled to synchronization module so that synchronization module identifies the starting of the 3rd signal
Point.When demodulation module receives three signal of synchronization module transmission, the waveform of reception signal is determined, based on identified
Waveform decodes to the 3rd signal.
Fig. 3 is signal decoding method flow chart provided in an embodiment of the present invention.Referring to Fig. 3, the embodiment includes：
301st, receiver carries out auto-correlation computation to received signal, removes the noise signal in the signal, obtains
First signal.
Wherein, the auto-correlation refers to signal existing relevance between state at different moments.It that is to say, signal is 1
Dependence between the instantaneous value at individual moment and the instantaneous value at another 1 moment.
In embodiments of the present invention, the signal that the receiver receives can be passed by the signal and signal that underground emitter is sent
Caused noise signal composition during defeated.Receiver carries out auto-correlation computation to the signal of reception, identifies two kinds of signals, counts
The autocorrelation value between two kinds of signal frequencies is calculated, the big signal of autocorrelation value is chosen from the autocorrelation value of two kinds of signal frequencies and is made
For the first signal, the identification to underground transmission signal is realized, avoids subsequently misreading code to noise signal.
302nd, receiver carries out Zero-tracking to first signal, removes the null offset of first signal, obtains second
Signal.
In direct-coupling amplifying circuit, the output voltage (electric current) when input signal being zero, Static output that is to say
The voltage (or electric current) of operating point as the reference voltage (or reference current), turns into zero point.Due to by environment temperature, power-supply fluctuation
Deng the influence of many factors, the zero point of emitter transmission signal is often what is fluctuated, and the embodiment of the present invention can be asked using window
Averaging method, signal zero is constantly calculated to realize Zero-tracking, and remove null offset, be easy to the calculating of signal energy.
303rd, receiver is adjusted to the signal amplitude of the secondary signal, obtains the 3rd signal, the letter of the 3rd signal
Number amplitude is within a preset range.
In embodiments of the present invention, receiver can calculate the secondary signal signal amplitude in preset time period and be averaged
Value, the signal amplitude using the average value as the secondary signal.When the signal amplitude of the secondary signal is more than first threshold, connect
The signal amplitude of the secondary signal is multiplied by the first coefficient by receipts machine so that the signal amplitude of the 3rd signal is within a preset range；When
When the signal amplitude of the secondary signal is less than Second Threshold, the signal amplitude of the secondary signal is multiplied by the second coefficient by receiver,
So that the signal amplitude of the 3rd signal is within a preset range, first coefficient is less than second coefficient so that receiver is with connecing
The secondary signal of receipts power and the signal amplitude of adjust automatically reception signal, the signal amplitude of output signal are maintained at default model
In enclosing, big ups and downs are avoided, ensure that receiver has high sensitivity and high stability.
304th, the phase and frequency of receiver adjustment local signal frame code so that the local signal and the 3rd signal frame are same
Step, the frame starting point using the frame starting point of the local signal as the 3rd signal.
Even if signal transmitter and receiver ensure frequency using the clock frequency source of pinpoint accuracy and high stability
With the stability of phase.But in actual applications, however it remains many inestimable uncertain factors, as send-receive clock is unstable
It is fixed, emission time is uncertain, channel transmission time delay and interference etc., especially in measurement while drilling application, the temperature residing for downhole system
It is very big to spend environmental change, directly results in the unstable of underground emission system frequency.These uncertain factors all have randomness,
Pre-compensation is unable to, it is necessary to by synchronous elimination.
By taking the signal frame synchronization of the frame format shown in table 1 as an example, the purpose of the signal frame synchronization is to identify the coding of frame head
FF00。
Table 1
In embodiments of the present invention, the process of frame synchronization includes frame Code acquisition (thick synchronous) and frame code tracking (thin synchronous).
Wherein, frame Code acquisition is the frequency and phase for adjusting local signal frame code, the 3rd letter for making locally generated frame code and receiving
Number frame intersymbol timing error is less than a default chip-spaced, it is preferable that timing error is less than 1 chip-spaced.Frame code tracking is
Local signal frame code phase is adjusted, timing error is further reduced, is less than the part of chip-spaced, reach local letter
Number frame code and the 3rd signal frame code frequency and phase precise synchronization received.As shown in figure 4, the 3rd signal is through broadband filter
Afterwards, related operation is carried out with local signal frame code in multiplier.Capture device adjustment VCC voltage controlled clock source, to adjust frame code hair
The frequency and phase of local frame code sequence, capture useful signal caused by raw device.Once useful signal is captured, start-up trace device
Part, to adjust clock source, local signal frame code generator and the 3rd signal is set to keep precise synchronization.If for some reason
Cause step-out, then restart new round capture and tracking.After synchronization system completes acquisition procedure, synchronization system is transferred to tracking
State.So-called tracking, it is the phase of local signal frame code is changed always with the pseudo-random code phases received, with receiving
Pseudo noise code keeps more accurate synchronous.Track loop constantly corrects the clock phase of local sequence, makes the phase of local sequence
Change is consistent with phase of received signal change, the PGC demodulation for the collection of letters number that achieves a butt joint, makes synchronous error as small as possible.With
Track is operation with closed ring, and after when both ends, difference occurs in phase, loop can reduce error according to error size adjust automatically.
The embodiment of the present invention realizes tracking or thin synchronous using the used sliding correlation method of frame Code acquisition, that is to say,
When searching for synchronous, its code sequencer is worked receiver with the speed different from transmitter code sequencer, is caused
The two yard of sequence slides over each other in phase, only when reaching at consistent, just stops, the quantity of the concurrent frame code used
It is less so that synchronous more accurate.
The embodiment of the present invention integrates after the 3rd signal frame code is multiplied with local frame code-phase, obtains their cross correlation value, so
Afterwards compared with a certain threshold value of threshold detector, judge whether to have captured useful signal.Using the correlation of frame code sequence,
When two identical code sequence phases are consistent, the output of its correlation is maximum.Once confirming that capture is completed, indication signal is captured
Synchronized-pulse control search control clock, adjusts frame code repetition rate and phase caused by frame code generator, the letter for being allowed to and receiving
Number keep synchronous.
305th, receiver adjustment local signal symbol so that the local signal and the 3rd signal bit synchronization, by the local
Position starting point of the position starting point of signal as the 3rd signal.
The purpose of bit synchronization is each code element is obtained optimal demodulation.The embodiment of the present invention can use self-synchronizing method,
Its bit synchronization information included is extracted from signal element.By comparing local clock and input signal, local clock is locked
On the input signals.The embodiment of the present invention can utilize digital phase-locked loop, by means of bit synchronization circuit from received numeral
Bit synchronization signal is directly read in baseband signal.As shown in figure 5, be first receiving terminal using phase discriminator compare receiving symbol and
The phase of locally generated bit synchronization signal, if both phases are inconsistent (advanced or hysteresis), phase discriminator just produces error signal
The phase of adjustment sync bit signal is gone, untill obtaining accurate synchronization.
306th, for receiver since the starting point of the 3rd signal, receiver obtains the signal in a cycle.
In embodiments of the present invention, receiver obtains the signal in a cycle since the starting point of the 3rd signal,
So that receiver obtains the full detail of all signals, when being subsequently demodulated to signal, the ripple of signal can be accurately identified
Shape.
307th, the signal in a cycle and existing signal waveform collection are carried out related operation by receiver, have been believed from this
Number waveform concentrates the waveform for determining the 3rd signal, and the 3rd signal is decoded based on identified waveform.
The embodiment of the present invention uses the structure of Correlation Demodulator as shown in Figure 6, and receiver utilizes orthogonal basis function { fn
(t), n=1,2 ..., N } framework signal space, existing signal waveform collection { sm(t), 1≤m≤M } in each signal can table
It is shown as fn(t) weighted linear combination.By the 3rd signal decomposition of reception into N-dimensional vector, that is, it is launched into a series of linear weighted functions
Orthogonal basis function fn(t),1≤n≤N.By one group of parallel N number of Correlation Demodulator, r (t) is calculated in N number of basic function fn(t) on
Projection r=[r1,r2,...rm].By calculating Euclidean distanceSelection is apart from upper closest
In received signal vector r signal sm, from this have signal waveform concentrate determine the 3rd signal waveform, based on identified
Waveform decodes to the 3rd signal.
Method provided in an embodiment of the present invention, by carrying out auto-correlation computation to reception signal, cancelling noise signal, obtain
Useful signal, then successively to useful signal remove null offset, adjust signal amplitude, identify starting point, determine signal waveform,
Decoded based on identified waveform so that even if receiver receives, signal intensity is faint, or even the signal that signal to noise ratio is low
When, also this kind of signal can accurately be decoded.
Fig. 7 is signal decoding apparatus structural representation provided in an embodiment of the present invention.Referring to Fig. 3, the device includes：Signal
Recognize module 701, Zero-tracking module 702, signal amplitude control module 703, synchronization module 704 and demodulation module 705.Its
In：
Signal recognition module 701 is used to carry out auto-correlation computation to received signal, removes the noise in the signal
Signal, obtain the first signal；Signal recognition module 701 is connected with Zero-tracking module 702, Zero-tracking module 702 be used for pair
First signal carries out Zero-tracking, removes the null offset of first signal, obtains secondary signal；Zero-tracking module 702
It is connected with signal amplitude control module 703, signal amplitude control module 703 is used to adjust the signal amplitude of the secondary signal
It is whole, the 3rd signal is obtained, the signal amplitude of the 3rd signal is within a preset range；Signal amplitude control module 703 and synchronous mould
Block 704 connects, and synchronization module 704 is used to adjust the phase and frequency of local signal frame code so that the local signal with it is described
3rd signal frame synchronization, the frame starting point using the frame starting point of the local signal as the 3rd signal；The local letter of adjustment
Number member so that the local signal and the 3rd signal bit synchronization, using the position starting point of the local signal as described in
The position starting point of 3rd signal；Synchronization module 704 is connected with demodulation module 705, and demodulation module 705 is used for from the 3rd signal
Starting point starts, and obtains the signal in a cycle, and the signal in a cycle is related to existing signal waveform collection progress
Computing, have the waveform of signal waveform concentration the 3rd signal of determination from this, the 3rd signal is entered based on identified waveform
Row decoding.
Alternatively, the signal amplitude control module 703 is additionally operable to when the signal amplitude of the secondary signal is more than first threshold
When, the signal amplitude of the secondary signal is multiplied by the first coefficient so that the signal amplitude of the 3rd signal is within a preset range；When this
When the signal amplitude of secondary signal is less than Second Threshold, the signal amplitude of the secondary signal is multiplied by the second coefficient so that this
Within a preset range, first coefficient is less than second coefficient to the signal amplitude of three signals.
Alternatively, the demodulation module 705 is additionally operable to since the starting point of the 3rd signal, obtains the letter in a cycle
Number；It is N-dimensional vector by the signal decomposition in a cycle；By each vector in N-dimensional vector, has signal with this respectively
Waveform collection carries out related operation, obtains vectorial r=[r1,r2,…,rN], wherein, riFor in N-dimensional vector r i-th vector with this
There is the value that signal waveform collection carries out related operation, N, i are natural number；By being made decisions to the vectorial r, has signal wave from this
Shape concentrates the waveform for determining the 3rd signal, and the 3rd signal is decoded based on identified waveform.
Device provided in an embodiment of the present invention, by carrying out auto-correlation computation to reception signal, cancelling noise signal, obtain
Useful signal, then successively to useful signal remove null offset, adjust signal amplitude, identify starting point, determine signal waveform,
Decoded based on identified waveform so that even if receiver receives, signal intensity is faint, or even the signal that signal to noise ratio is low
When, also this kind of signal can accurately be decoded.
It should be noted that：The signal decoding apparatus that above-described embodiment provides is when signal decodes, only with above-mentioned each function
The division progress of module, can be as needed and by above-mentioned function distribution by different function moulds for example, in practical application
Block is completed, i.e., the internal structure of device is divided into different functional modules, to complete all or part of work(described above
Energy.In addition, the signal decoding apparatus that above-described embodiment provides belongs to same design with signal decoding method embodiment, it is specific real
Existing process refers to embodiment of the method, repeats no more here.
One of ordinary skill in the art will appreciate that hardware can be passed through by realizing all or part of step of above-described embodiment
To complete, by program the hardware of correlation can also be instructed to complete, described program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only storage, disk or CD etc..
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (4)
1. a kind of signal decoding method, it is characterised in that methods described includes：
Auto-correlation computation is carried out to received signal, the noise signal in the signal is removed, obtains the first signal；
Zero-tracking is carried out to first signal, the null offset of first signal is removed, obtains secondary signal；
The signal amplitude of the secondary signal is adjusted, obtains the 3rd signal, the signal amplitude of the 3rd signal is pre-
If in scope；
Adjust the phase and frequency of local signal frame code so that the local signal and the 3rd signal frame synchronization, by described in
Frame starting point of the frame starting point of local signal as the 3rd signal；
Adjust local signal symbol so that the local signal and the 3rd signal bit synchronization, by the position of the local signal
Position starting point of the starting point as the 3rd signal；
Since the starting point of the 3rd signal, obtain a cycle in signal, by the signal in one cycle with
Existing signal waveform collection carries out related operation, and the waveform for determining the 3rd signal is concentrated from the existing signal waveform, is based on
Identified waveform decodes to the 3rd signal.
2. according to the method for claim 1, it is characterised in that since the starting point of the 3rd signal, obtain one
Signal in cycle, the signal in one cycle and existing signal waveform collection are subjected to related operation, believed from described
Number waveform concentrates the waveform for determining the 3rd signal, and carrying out decoding to the 3rd signal based on identified waveform includes：
Since the starting point of the 3rd signal, the signal in a cycle is obtained；
It is N-dimensional vector by the signal decomposition in one cycle；
By each vector in N-dimensional vector, related operation is carried out with the existing signal waveform collection respectively, obtains vectorial r=
[r1,r2,…,rN], wherein, riRelated operation is carried out for i-th in N-dimensional vector r vectorial and described existing signal waveform collection
Value, N, i are natural number；
By being made decisions to the vectorial r, the waveform for determining the 3rd signal is concentrated from the existing signal waveform, is based on
Identified waveform decodes to the 3rd signal.
3. a kind of signal decoding apparatus, it is characterised in that described device includes：
Signal recognition module, for carrying out auto-correlation computation to received signal, the noise signal in the signal is removed,
Obtain the first signal；
Zero-tracking module, for carrying out Zero-tracking to first signal, the null offset of first signal is removed, is obtained
To secondary signal；
Signal amplitude control module, for being adjusted to the signal amplitude of the secondary signal, obtain the 3rd signal, described
The signal amplitude of three signals is within a preset range；
Synchronization module, for adjusting the phase and frequency of local signal frame code so that the local signal and the 3rd signal
Frame synchronization, the frame starting point using the frame starting point of the local signal as the 3rd signal；Local signal symbol is adjusted, is made
The local signal and the 3rd signal bit synchronization are obtained, using the position starting point of the local signal as the 3rd signal
Position starting point；
Demodulation module, for since the starting point of the 3rd signal, the signal in a cycle being obtained, by one week
Signal in phase carries out related operation with existing signal waveform collection, is concentrated from the existing signal waveform and determines the 3rd signal
Waveform, the 3rd signal is decoded based on identified waveform.
4. device according to claim 3, it is characterised in that the demodulation module is additionally operable to from the 3rd signal
Initial point starts, and obtains the signal in a cycle；It is N-dimensional vector by the signal decomposition in one cycle；By in N-dimensional vector
Each vector, carry out related operation with the existing signal waveform collection respectively, obtain vectorial r=[r1,r2,…,rN], its
In, riFor i-th in the N-dimensional vector r vectorial value that related operation is carried out with the existing signal waveform collection, N, i are natural number；It is logical
Cross and the vectorial r is made decisions, the waveform for determining the 3rd signal is concentrated from the existing signal waveform, based on being determined
Waveform the 3rd signal is decoded.
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| CN110633588B (en) * | 2019-09-12 | 2022-11-22 | 兆讯恒达科技股份有限公司 | Noise identification method for magnetic stripe card reader |
| CN112761625B (en) * | 2020-12-18 | 2021-09-28 | 中国科学院地质与地球物理研究所 | Synchronization method of measurement while drilling system |
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| WO2000057360A1 (en) * | 1999-03-18 | 2000-09-28 | Koninklijke Philips Electronics N.V. | Video signal processing |
| CN101399805A (en) * | 2008-10-17 | 2009-04-01 | 天津大学 | Frame synchronization method for full phase OFDM system |
| CN202435432U (en) * | 2011-12-29 | 2012-09-12 | 东南大学 | Realizing circuit of synchronized method in single-carrier-wave frequency domain balancing system |
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