CN103685107B - Method and device for eliminating direct current component - Google Patents
Method and device for eliminating direct current component Download PDFInfo
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- CN103685107B CN103685107B CN201310690422.1A CN201310690422A CN103685107B CN 103685107 B CN103685107 B CN 103685107B CN 201310690422 A CN201310690422 A CN 201310690422A CN 103685107 B CN103685107 B CN 103685107B
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Abstract
The invention provides a method and device for eliminating a direct current component and relates to the field of communication. The problem that an existing direct current component calculation mode is low in efficiency is solved. The method comprises the steps that a synchronous code is detected; according to an orthogonal vector of the synchronous code which is obtained through detection, the direct current component of a current receiving waveform is calculated; the direct current component obtained through calculation is eliminated from the following waveform of the synchronous code. According to the technical scheme, the method and device for eliminating the direct current component are suitable for digital intercoms and the direct current component can be eliminated accurately in real time.
Description
Technical field
The present invention relates to the communications field, the DC component elimination method under more particularly, to a kind of dpmr scheme and device.
Background technology
Follow-up investigation to Digital Radio intercommunication technology and market shows, is within 2008 to 2013 that simulation switchs to numeral
Conversion period.Will turn to the digital intercom of low cost in this major part market in stage, and dpmr is it is nowadays accepted that business right
Say best solution.It will replace analog-interphone terminal to be applied to various fields, realizes short-haul call, data transfer
Etc. function.Because digital handset uses 4fsk modulation-demodulation technique, before receiving judgement, need to dynamically remove straight in waveform
Flow component,
In existing technical scheme, calculated dynamically using the lead code before synchronous code fs1 in agreement frame structure head frame
DC component, and it is applied to this call with this value replacement calibration value.Currently existing scheme utilizes lead code (9 5f in head frame
Sine wave) calculating dynamic DC component, because an air time is longer, affected by noise in data transmission procedure, ripple
Shape can fluctuate, and DC component also changes therewith, and above-mentioned dynamic DC component is applied to whole communication process will certainly be made
Become the raising of the bit error rate；Furthermore, in voice superframes and tail frame, do not have sine wave as lead code it is impossible to use according to lead code meter
The method calculating DC component.
To sum up, existing DC component calculation is less efficient, leads to not accurately and effectively in whole data transfer
During reject DC component.
Content of the invention
The invention provides a kind of DC component elimination method and device, solve existing DC component calculation effect
The relatively low problem of rate.
A kind of DC component elimination method, comprising:
Detection synchronous code；
The orthogonal vectors of the described synchronous code being obtained according to detection calculate the current DC component receiving waveform；
Calculated described DC component is rejected from the subsequent waveform of described synchronous code.
Preferably, described synchronous code is dpmr digital handset synchronous code.
Preferably, the orthogonal vectors of the described described synchronous code being obtained according to detection calculate the current direct current receiving waveform and divide
Amount includes:
Calculate the orthogonal vectors of described synchronous code；
According to the described current DC component receiving waveform of following formula calculating:
Dc=c/ σ v,
Wherein, dc be DC component, v is the orthogonal vectors of described synchronous code, c be currently receive synchronous code waveform with described
The scalar product of the orthogonal vectors of synchronous code.
Preferably, the orthogonal vectors calculating described synchronous code include:
Using the orthogonal vectors asking singular value function svd to calculate described synchronous code.
Present invention also offers a kind of DC component device for eliminating, comprising:
Synchronous code detection module, for detecting synchronous code；
DC component computing module, the orthogonal vectors of the described synchronous code for being obtained according to detection calculate current received wave
The DC component of shape；
DC component reject module, for by calculated described DC component from the subsequent waveform of described synchronous code
Reject.
Preferably, described DC component computing module includes:
Orthogonal vectors computing unit, for calculating the orthogonal vectors of described synchronous code；
DC component computing unit, for according to the described current DC component receiving waveform of following formula calculating:
Dc=c/ σ v,
Wherein, dc be DC component, v is the orthogonal vectors of described synchronous code, c be currently receive synchronous code waveform with described
The scalar product of the orthogonal vectors of synchronous code.
Preferably, described orthogonal vectors computing unit, asks singular value function svd to calculate described synchronous code specifically for using
Orthogonal vectors.
The invention provides a kind of DC component elimination method and device, detect synchronous code first, then according to detecting
The orthogonal vectors of the described synchronous code arriving calculate the current DC component receiving waveform, then by calculated described DC component
Reject from the subsequent waveform of described synchronous code.Achieve accurately DC component rejecting in real time, solve existing direct current and divide
The less efficient problem of amount calculation.
Brief description
Fig. 1 is the frame structure schematic diagram of fs1；
Fig. 2 is the frame structure schematic diagram of fs2；
Fig. 3 is the frame structure schematic diagram of fs3；
Fig. 4 is the frame structure schematic diagram of fs4；
A kind of flow chart of DC component elimination method that Fig. 5 provides for embodiments of the invention one；
A kind of structural representation of DC component device for eliminating that Fig. 6 provides for embodiments of the invention two；
Fig. 7 is the structural representation of DC component computing module 602 in Fig. 6.
Specific embodiment
In existing technical scheme, calculated dynamically using the lead code before synchronous code fs1 in agreement frame structure head frame
DC component, and it is applied to this call with this value replacement calibration value.Currently existing scheme utilizes lead code (9 5f in head frame
Sine wave) calculating dynamic DC component, because an air time is longer, affected by noise in data transmission procedure, ripple
Shape can fluctuate, and DC component also changes therewith, and above-mentioned dynamic DC component is applied to whole communication process will certainly be made
Become the raising of the bit error rate；Furthermore, in voice superframes and tail frame, do not have sine wave as lead code it is impossible to use according to lead code meter
The method calculating DC component.
In order to solve the above problems, The embodiment provides a kind of DC component elimination method and device.Hereafter
In embodiments of the present invention will be described in detail with reference to the accompanying drawings.It should be noted that in the case of not conflicting, the application
In embodiment and the feature in embodiment can mutually be combined.
Combine accompanying drawing first, embodiments of the invention one are illustrated.
Embodiments provide a kind of DC component elimination method, the application scenarios of the embodiment of the present invention are as follows:
Dpmr digital handset adopt fdma(frequency division multiple access) access way, modulation system adopt 4fsk(level Four frequency displacement
Keying).
Before receiving judgement, need to dynamically remove the DC component in waveform.The orthogonal of synchronous code is utilized in the embodiment of the present invention
Vector, to calculate dynamic DC component, can guarantee that the instantaneity of direct current component value, can effectively reduce the bit error rate.
Introduce the synchronous code of dpmr first.
Dpmr digital handset synchronous code has 4 kinds, and respectively fs1, fs2, fs3 and fs4, wherein fs1 are used for head frame (frame knot
Structure is shown in Fig. 1), fs2 is used for voice superframes (Fig. 2 is shown in by frame structure), and fs3 is used for tail frame (Fig. 3 is shown in by frame structure), and fs4 is used for packet
Head frame (Fig. 4 is shown in by frame structure).
Affected by noise in data transmission procedure, waveform can fluctuate, and needs the dynamic DC component of instant computing.This
Bright embodiment calculates DC component using the orthogonal vectors of synchronous code, and idiographic flow is as shown in Figure 5, comprising:
Step 501, detection synchronous code；
In this step, involved synchronous code can be any one in fs1, fs2, fs3 and fs4.
Step 502, the orthogonal vectors of the described synchronous code being obtained according to detection calculate the current DC component receiving waveform；
In this step, calculate the orthogonal vectors of this synchronous code first, specifically, singular value letter can be sought by using matlab
Number svd calculates and gets.
Then it is assumed that the synchronous code waveform receiving is fs+dc, dc is DC component, and v is the orthogonal vectors of fs, according to
Following algorithm obtains expression formula one:
∵ σ fs × v=0
∴ dc=c/ σ v expression formula one
Step 503, calculated described DC component is rejected from the subsequent waveform of described synchronous code.
Below in conjunction with the accompanying drawings, embodiments of the invention two are illustrated.
Embodiments provide a kind of DC component device for eliminating, the structure of this device is as shown in Figure 6, comprising:
Synchronous code detection module 601, for detecting synchronous code；
DC component computing module 602, the orthogonal vectors of the described synchronous code for being obtained according to detection calculate and currently connect
Receive the DC component of waveform；
DC component reject module 603, for by calculated described DC component from the subsequent ripple of described synchronous code
Reject in shape.
Wherein, described DC component computing module 602 structure as shown in fig. 7, comprises:
Orthogonal vectors computing unit 6021, for calculating the orthogonal vectors of described synchronous code；
DC component computing unit 6022, divides for calculating the described current direct current receiving waveform according to following formula
Amount:
Dc=c/ σ v,
Wherein, dc be DC component, v is the orthogonal vectors of described synchronous code, c be currently receive synchronous code waveform with described
The scalar product of the orthogonal vectors of synchronous code.
Assume that the current synchronous code waveform that receives is x={ x1,x2,…,xn, the orthogonal vectors of synchronous code are v={ v1,
v2,…,vn, then currently receive the scalar product c=x v=x of synchronous code waveform and the orthogonal vectors of synchronous code1×v1+x2×v2
+…+xn×vn.
Preferably, described orthogonal vectors computing unit 6021, specifically for described same using asking singular value function svd to calculate
The orthogonal vectors of step code.
The embodiment provides a kind of DC component elimination method and device, detect synchronous code, Ran Hougen first
The orthogonal vectors of the described synchronous code obtaining according to detection calculate the current DC component receiving waveform, then will be calculated described
DC component is rejected from the subsequent waveform of described synchronous code.Achieve accurately DC component rejecting in real time, solve existing
The less efficient problem of DC component calculation.
The technical scheme being provided using embodiments of the invention all can be accurate to the synchronous code of sine wave or non-sinusoidal waveform
Be calculated dynamic DC component, and by calculated DC component be used for synchronous code followed by waveform, such as head frame, tail frame
Deng, can effectively reduce the bit error rate, fixing decision threshold can be determined according to the amplitude receiving waveform, thus not by receiving number
Impact according to waveform fluctuation.
One of ordinary skill in the art will appreciate that all or part of step of above-described embodiment can use computer journey
Realizing, described computer program can be stored in a computer-readable recording medium sequence flow process, and described computer program exists
(as system, unit, device etc.) execution on corresponding hardware platform, upon execution, including embodiment of the method step it
One or a combination thereof.
Alternatively, all or part of step of above-described embodiment can also be realized using integrated circuit, and these steps can
To be fabricated to integrated circuit modules one by one respectively, or the multiple modules in them or step are fabricated to single integrated electricity
Road module is realizing.So, the present invention is not restricted to any specific hardware and software combination.
Each device/functional module/functional unit in above-described embodiment can be realized using general computing device, it
Can concentrate on single computing device it is also possible to be distributed on the network that multiple computing devices are formed.
Each device/functional module/functional unit in above-described embodiment realized using in the form of software function module and as
When independent production marketing or use, can be stored in a computer read/write memory medium.Computer mentioned above
Read/write memory medium can be read-only storage, disk or CD etc..
Any those familiar with the art the invention discloses technical scope in, can readily occur in change or
Replace, all should be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the guarantor described in claim
Shield scope is defined.
Claims (5)
1. a kind of DC component elimination method is it is characterised in that include:
Detection synchronous code；
The orthogonal vectors of the described synchronous code being obtained according to detection calculate the current DC component receiving synchronous code waveform, comprising:
Calculate the orthogonal vectors of described synchronous code；According to the described current DC component receiving synchronous code waveform of following formula calculating:
Dc=c/ ∑ v,
Wherein, dc is DC component, and v is the orthogonal vectors of described synchronous code, and c is currently to receive synchronous code waveform and described synchronization
The scalar product of the orthogonal vectors of code, is x={ x for the current synchronous code waveform that receives1,x2,…,xn, the orthogonal vectors of synchronous code
For v={ v1,v2,…,vn, then currently receive the scalar product c=x v=x of synchronous code waveform and the orthogonal vectors of synchronous code1×
v1+x2×v2+…+xn×vn；
Calculated described DC component is rejected from the subsequent waveform of described synchronous code.
2. DC component elimination method according to claim 1 is it is characterised in that described synchronous code is dpmr digital intercom
Machine synchronous code.
3. DC component elimination method according to claim 1 is it is characterised in that calculate the orthogonal vectors of described synchronous code
Including:
Using the orthogonal vectors asking singular value function svd to calculate described synchronous code.
4. a kind of DC component device for eliminating is it is characterised in that include:
Synchronous code detection module, for detecting synchronous code；
DC component computing module, the orthogonal vectors of the described synchronous code for being obtained according to detection calculate current reception synchronous code
The DC component of waveform, described DC component computing module includes orthogonal vectors computing unit and DC component computing unit, its
In:
Orthogonal vectors computing unit, for calculating the orthogonal vectors of described synchronous code；
DC component computing unit, for according to the described current DC component receiving synchronous code waveform of following formula calculating:
Dc=c/ ∑ v,
Wherein, dc is DC component, and v is the orthogonal vectors of described synchronous code, and c is currently to receive synchronous code waveform and described synchronization
The scalar product of the orthogonal vectors of code, is x={ x for the current synchronous code waveform that receives1,x2,…,xn, the orthogonal vectors of synchronous code
For v={ v1,v2,…,vn, then currently receive the scalar product c=x v=x of synchronous code waveform and the orthogonal vectors of synchronous code1×
v1+x2×v2+…+xn×vn；
DC component rejects module, for picking calculated described DC component from the subsequent waveform of described synchronous code
Remove.
5. DC component device for eliminating according to claim 4, it is characterised in that described orthogonal vectors computing unit, has
Body is used for using the orthogonal vectors asking singular value function svd to calculate described synchronous code.
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Citations (4)
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|---|---|---|---|---|
| US5881046A (en) * | 1994-03-16 | 1999-03-09 | Kabushiki Kaisha Toshiba | Signal recording apparatus for recording a synchronous and cancel code on a recording medium |
| CN102437900A (en) * | 2011-12-28 | 2012-05-02 | 大唐微电子技术有限公司 | Digital interphone and method for reducing error rate of digital interphone |
| CN103338173A (en) * | 2013-06-04 | 2013-10-02 | 深圳市力同亚太科技有限公司 | A method and an apparatus for recovering code elements |
| CN103428131A (en) * | 2013-09-03 | 2013-12-04 | 天津七一二通信广播有限公司 | Method for calculating dc components and judgment threshold in DMR communication |
-
2013
- 2013-12-16 CN CN201310690422.1A patent/CN103685107B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5881046A (en) * | 1994-03-16 | 1999-03-09 | Kabushiki Kaisha Toshiba | Signal recording apparatus for recording a synchronous and cancel code on a recording medium |
| CN102437900A (en) * | 2011-12-28 | 2012-05-02 | 大唐微电子技术有限公司 | Digital interphone and method for reducing error rate of digital interphone |
| CN103338173A (en) * | 2013-06-04 | 2013-10-02 | 深圳市力同亚太科技有限公司 | A method and an apparatus for recovering code elements |
| CN103428131A (en) * | 2013-09-03 | 2013-12-04 | 天津七一二通信广播有限公司 | Method for calculating dc components and judgment threshold in DMR communication |
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