CN101582865B - Direct-current offset compensation method and device of digital self-adapting mobile TV - Google Patents
Direct-current offset compensation method and device of digital self-adapting mobile TV Download PDFInfo
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- CN101582865B CN101582865B CN2008100818880A CN200810081888A CN101582865B CN 101582865 B CN101582865 B CN 101582865B CN 2008100818880 A CN2008100818880 A CN 2008100818880A CN 200810081888 A CN200810081888 A CN 200810081888A CN 101582865 B CN101582865 B CN 101582865B
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Abstract
The invention discloses a direct-current offset compensation method and a direct-current offset compensation device of a digital self-adapting mobile TV. The direct-current offset compensation method comprises the following steps: (1) resetting and initializing a radio-frequency receiving signal converted by digital/analog conversion in an accumulating way to obtain direct-current offset components; (2) judging if the direct-current offset components obtained in the step (1) needs to replace original direct-current offset components according to the fact that if the current operation is the operation for the first time after resetting, if an expected direction is opposite to an original direction and if an oscillating counter surpasses a threshold after plus 1; (3) judging a time accumulating direction for configuring the oscillating counter according to a marked original direction and outputting the direct-current offset components; and (4) eliminating the direct-current offset components obtained in the step (3) from the radio-frequency receiving signal. The invention solves the problem that the property of an integral receiving end is reduced because the property of the partial radio-frequency of the receiving end is poor.
Description
Technical field
The present invention relates to IC design field, FPGA (Field Programmable Gate Array; Field programmable gate array) design field and field of mobile phone; More particularly; Relate to the digital self-adapting mobile TV direct current biasing compensatory approach and the device that are used for CMMB (China Mobile Multimedia Broadcasting, China Mobile multimedia broadcasting) standard.
Background technology
The CMMB standard is the mobile TV standard that China has independent intellectual property right, and it adopts OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology.
In the substandard mobile phone TV services of CMMB, usually, the direct current biasing compensation realizes at the radio frequency receiving unit, its objective is for fear of because the excessive ADC that causes of direct current biasing (Analog to DigitalConverter, analog/digital converter) is saturated.When ADC is saturated, can cause useful signal can't solve or separate mistake.
If but radio frequency part performance not good (even a merchandiser chip is relevant); The subsequent treatment performance is reduced; Therefore; How just can take a kind of simple processing to compensate the not good situation of radio frequency direct current biasing compensation performance, and the global reliability of receiving terminal is improved, become and be problem demanding prompt solution in the prior art.
Summary of the invention
The technical problem that the present invention solved is to provide a kind of digital self-adapting mobile TV direct-current offset compensation method and device, to solve in the prior art because the not good problem that causes the receiving terminal overall performance to reduce of receiving terminal radio frequency part performance.
In order to address the above problem, the invention provides a kind of digital self-adapting mobile TV direct-current offset compensation method, it is characterized in that, may further comprise the steps:
(1) radio frequency receiving signal after digital-to-analogue conversion is carried out reset initialization and the operation that adds up, obtain the direct current biasing component;
Whether be to reset that carry out for the first time the back, whether anticipated orientation is in the opposite direction with history according to current executed (2), and whether the concussion counter surpass thresholding after adding 1, whether the direct current biasing component that comes execution in step (1) to obtain need replace historical direct current biasing component;
(3) judge the accumulative frequency direction of configuration concussion counter according to indicating historical direction, and output direct current biasing component;
(4) from said radio frequency receiving signal, reject the direct current biasing component that step (3) obtains.
Method of the present invention, wherein, said step (2) comprising:
(21) judge whether current executed is the back execution for the first time that resets, if execution in step (22), otherwise execution in step (23);
(22) the direct current biasing component that obtains with step (1) upgrades historical direct current biasing component, identifies historical direction for rising concussion counter O reset, execution in step (3);
(23) the direct current biasing component that obtains of more historical direct current biasing component and step (1); If anticipated orientation is with historical in the opposite direction; Then judge the concussion counter; If said concussion counter adds 1 and equals thresholding, then do not upgrade historical direct current biasing component and do not upgrade historical direction yet, said concussion counter remains unchanged; If said concussion counter adds 1 less than thresholding, the direct current biasing component of then using step (1) to obtain upgrades historical direct current biasing component, upgrades historical direction with current anticipated orientation, and said concussion counter adds 1; If anticipated orientation is identical with historical direction, then said concussion counter O reset, the direct current biasing component that obtains with step (1) upgrades historical direct current biasing component, upgrades historical direction with current anticipated orientation, execution in step (3).
Method of the present invention, wherein, said anticipated orientation when the direct current biasing component that obtains for current step (1) is big, then indicates anticipated orientation for rising, otherwise for descending.
Wherein, said step (3) comprising: if indicate historical direction for rising, the accumulative frequency that then shakes counter increases, otherwise, then reduce.
Wherein, said step (1) is further for carrying out reset initialization and through the summary counter operation that adds up, obtaining the direct current biasing component to the radio frequency receiving signal after digital-to-analogue conversion; Said summary counter is made up of two adders, and its default configuration is 7;
The thresholding of said concussion counter is 30.
In order to address the above problem, the present invention also provides a kind of digital self-adapting mobile TV direct current biasing compensation arrangement, it is characterized in that, comprises direct current biasing computing module, parameter update module and direct current biasing compensating module, wherein,
Said direct current biasing computing module is used for the radio frequency receiving signal after digital-to-analogue conversion is carried out reset initialization and the operation that adds up, and obtains the direct current biasing component;
Said parameter update module; Whether be used for carrying out according to said direct current biasing computing module is to reset that carry out for the first time the back, whether anticipated orientation is in the opposite direction with history; And whether the concussion counter surpasses thresholding after adding 1; Carry out whether need the direct current biasing component that said direct current biasing computing module obtains be replaced with historical direct current biasing component, judge the accumulative frequency direction of configuration concussion counter according to indicating historical direction then, and output direct current biasing component;
Said direct current biasing compensating module is used for rejecting the direct current biasing component that said parameter update module obtains from receiving signal.
Device of the present invention; Wherein, said parameter update module is further used for judging whether said direct current biasing computing module is carried out is the back execution for the first time that resets; If then use the direct current biasing component that said direct current biasing computing module is obtained to upgrade historical direct current biasing component; Indicate historical direction for rising, the concussion counter O reset is judged the accumulative frequency direction of configuration concussion counter according to indicating historical direction then; And behind the output direct current biasing component, carry out said direct current biasing compensating module;
Carry out for the first time the back if not resetting; The direct current biasing component that then more historical direct current biasing component and said direct current biasing computing module obtain; If anticipated orientation is then judged the concussion counter with historical in the opposite direction,, said concussion counter equals thresholding if adding 1; Then do not upgrade historical direct current biasing component and also do not upgrade historical direction, said concussion counter remains unchanged; If said concussion counter adds 1 less than thresholding, the direct current biasing component that then obtains with said direct current biasing computing module upgrades historical direct current biasing component, upgrades historical direction with current anticipated orientation, and said concussion counter adds 1; If anticipated orientation is identical with historical direction; Then said concussion counter O reset; The direct current biasing component that obtains with said direct current biasing computing module upgrades historical direct current biasing component, upgrades historical direction with current anticipated orientation, judges the accumulative frequency direction of configuration concussion counter according to indicating historical direction then; And behind the output direct current biasing component, carry out said direct current biasing compensating module.
Device of the present invention, wherein, said anticipated orientation when the direct current biasing component that obtains for said direct current biasing computing module is big, then indicates anticipated orientation for rising, otherwise for descending.
Wherein, Said parameter update module is used for judging the accumulative frequency direction of configuration concussion counter according to indicating historical direction that further for said parameter update module is used for according to indicating historical direction for rising, the accumulative frequency that then shakes counter increases; Otherwise, then reduce.
Wherein, said direct current biasing computing module is further used for the radio frequency receiving signal after digital-to-analogue conversion is carried out reset initialization and through the summary counter operation that adds up, obtains the direct current biasing component; Said summary counter is made up of two adders, and its default configuration is 7;
Vibration counter thresholding in the said parameter update module is 30.
Wherein, said direct current biasing compensating module is the signed number subtracter.
Compared with prior art, the invention solves because the not good problem that causes the receiving terminal overall performance to reduce of receiving terminal radio frequency part performance.
Description of drawings
Fig. 1 is a digital self-adapting mobile TV direct current biasing compensation arrangement structure chart of the present invention;
Fig. 2 is the realization flow figure of digital self-adapting mobile TV direct-current offset compensation method of the present invention.
Embodiment
The present invention provides a kind of digital self-adapting mobile TV direct-current offset compensation method and device here, to solve in the prior art because the not good problem that causes the receiving terminal overall performance to reduce of receiving terminal radio frequency part performance.Below embodiment is described in detail, but not as to qualification of the present invention.
As shown in Figure 1, device of the present invention can be divided into following components: 1) direct current biasing computing module; 2) parameter update module; 3) direct current biasing compensating module.
Core concept of the present invention is should be 0 according to the time-domain signal that OFDM transmits based on its mean value of statistical significance.Following mask body is introduced each module:
The direct current biasing computing module divides IQ two-way (real part after the mapping and imaginary part two paths of signals) to calculate, and at first carries out reset initialization and carries out accumulating operation, and the accumulative frequency of summary counter is by the parameter update block configuration.When accumulative frequency arrives, ask respectively on average then, promptly try to achieve average direct current biasing component in the accumulative frequency of the radio frequency receiving signal after digital-to-analogue conversion by accumulative frequency IQ two-way;
Summary counter configuration parameter default configuration is 7 (data of about 13ms promptly have corresponding relation with the time if desired, and 7 expressions are about 13 milliseconds in concrete the application) in the present embodiment, and the number that adds up account form is k=2
Ref+10, ref is a configuration parameter, the wide 4bit of ref; Span is 0-15, and input IQ two-way is respectively the signed number certificate of 12bit, so the output bit wide of summary counter is 37bit; Promptly realize adding up of IQ two-way with two wide adders of 37bit; The power averaging that adds up after finishing can be realized (for simplified design, the accumulative frequency in the present embodiment is 2 integral number power) with shifting function, then two values is on average tried to achieve the direct current biasing component.
The parameter update module; It realizes the dynamic adjustments of configuration accumulative frequency; According to the direct current biasing component of direct current biasing computing module calculating and the size of historical direct current biasing component; The accumulative frequency of decision vibration counter increases or dwindles, and when continuous several times accumulative frequency concussion changes, keeps last configuration parameter stable identical with the historical direction of preserving up to new adjustment direction; The renewal that it mainly realizes history register comprises top said a series of control operation, gets final product simple realization according to the performing step of the method for the invention; In the present embodiment; Vibration counter thresholding is made as 30, and hand designations 0 expression reduces the parameter that adds up, and 1 expression increases the parameter that adds up.The amplitude of accommodation of the parameter that adds up is 1.
Be provided with down at above-mentioned parameter, after resetting, summary counter be updated to 7 (7 refer to the parameter of summary counters, its expression be that the maximum count value of summary counter is k=2
Ref+10-1), the operation that begins to add up, and counting (being initially 0) (initial value of 0 expression summary counter, expression is since 0 counting) are when counting satisfies k=2
Ref+10The time, latch two adders, be shifted and ask average operation, the direct current biasing component is asked on average-tried to achieve to the IQ two-way; Upgrade the historical amount of direct current biasing with current direct current biasing, it is clear 0 shake counter, and anticipated orientation is put upwards, carries out direct current biasing then and compensates (deducting direct current biasing with input signal); This is to carry out for the first time, and follow-up execution asks direct current biasing the same, seek only direct current biasing and latch after; Carry out correlated judgment, revision concussion Counter Value draws and adopts the direct current biasing component; Upgrade historical variable (direction, direct current biasing component), (be rising according to direction adjustment concussion counter configuration parameter then if identify historical direction; Then shake the counter accumulative frequency and add 1, otherwise, then subtract 1).
The direct current biasing compensating module is primarily implemented in and rejects the direct current biasing component in the signal, and in the present invention, the IQ two-way direct current biasing amount that is about to calculate deducts in follow-up signal.The direct current biasing compensating module is the signed number subtracter of 12bit.
As shown in Figure 2, be the realization flow figure of digital self-adapting mobile TV direct-current offset compensation method;
Step 1, reset initialization, initialization accumulative frequency; Must be when beginning here from the inferior beginning that resets, resetting after still beginning is exactly a usual terms, and need judging whether exactly to reset determines whether returning to initial state, and hardware just continues to carry out according to subsequent order as not resetting;
Step 2 is carried out the operation that adds up, and the radio frequency receiving signal after digital-to-analogue conversion is on average asked the direct current biasing component;
Step 3 judges whether current executed is the back execution for the first time that resets, if execution in step 4, otherwise execution in step 5;
Step 4 is upgraded historical direct current biasing component with current calculating direct current biasing component, indicates historical direction for rising, and the concussion counter is clear 0, execution in step 6;
Step 5, more historical direct current biasing component and current direct current biasing component are if anticipated orientation is (if current direct current biasing is big; Then put anticipated orientation for rising; Otherwise for descending) with historical in the opposite direction, then judge the concussion counter, if adding 1, the concussion counter equals thresholding; Then do not upgrade historical direct current biasing and also do not upgrade historical hand designations, the concussion counter remains unchanged; If the concussion counter adds 1 less than thresholding, then upgrade historical direct current biasing component with current direct current biasing component, indicate with current anticipated orientation and upgrade historical hand designations, the concussion counter adds 1; If anticipated orientation is identical with historical direction, it is clear 0 then to shake counter, upgrades historical direct current biasing component with current direct current biasing component, indicates with current anticipated orientation and upgrades historical hand designations, execution in step 6;
Step 6 is judged the accumulative frequency direction of configuration concussion counter according to indicating historical direction, if promptly indicate historical direction for rising, the accumulative frequency that then shakes counter increases, otherwise, then reduce, carried out for the 7th step;
Step 7, direct current biasing compensation (deducting direct current biasing with input signal) carried out for the 2nd step.
Method of the present invention; After wherein resetting, at first ask direct current biasing, this is the bias that calculates in a period of time; The object that is follow-up elimination (but not necessarily is worth with this; Just the back edge joint reason of some judgements), through after judging, carrying out the direct current biasing compensating operation after determining the direct current biasing that will deduct.So repeatedly circulation then is to arrive stable state.
Compared with prior art, method and apparatus of the present invention has solved because the not good problem that causes the receiving terminal overall performance to reduce of receiving terminal radio frequency part performance.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (9)
1. a digital self-adapting mobile TV direct-current offset compensation method is characterized in that, may further comprise the steps:
(1) radio frequency receiving signal after digital-to-analogue conversion is carried out reset initialization and the operation that adds up, obtain the direct current biasing component;
Whether be to reset that carry out for the first time the back, whether anticipated orientation is in the opposite direction with history according to current executed (2), and whether the concussion counter surpass thresholding after adding 1, whether the direct current biasing component that comes execution in step (1) to obtain need replace historical direct current biasing component;
Said step (2) comprising:
(21) judge whether current executed is the back execution for the first time that resets, if execution in step (22), otherwise execution in step (23);
(22) the direct current biasing component that obtains with step (1) upgrades historical direct current biasing component, identifies historical direction for rising concussion counter O reset, execution in step (3);
(23) the direct current biasing component that obtains of more historical direct current biasing component and step (1); If anticipated orientation is with historical in the opposite direction; Then judge the concussion counter; If said concussion counter adds 1 and equals thresholding, then do not upgrade historical direct current biasing component and do not upgrade historical direction yet, said concussion counter remains unchanged; If said concussion counter adds 1 less than thresholding, the direct current biasing component of then using step (1) to obtain upgrades historical direct current biasing component, upgrades historical direction with current anticipated orientation, and said concussion counter adds 1; If anticipated orientation is identical with historical direction, then said concussion counter O reset, the direct current biasing component that obtains with step (1) upgrades historical direct current biasing component, upgrades historical direction with current anticipated orientation, execution in step (3);
(3) judge the accumulative frequency direction of configuration concussion counter according to indicating historical direction, and output direct current biasing component;
(4) from said radio frequency receiving signal, reject the direct current biasing component that step (3) obtains.
2. the method for claim 1 is characterized in that, said anticipated orientation, and the direct current biasing component that obtains for current step (1) is during greater than historical direct current biasing component, then indicates anticipated orientation for rising, otherwise for descending.
3. the method for claim 1 is characterized in that, said step (3) comprising: if indicate historical direction for rising, the accumulative frequency that then shakes counter increases, otherwise, then reduce.
4. the method for claim 1 is characterized in that, said step (1) is further for carrying out reset initialization and through the summary counter operation that adds up, obtaining the direct current biasing component to the radio frequency receiving signal after digital-to-analogue conversion; Said summary counter is made up of two adders, and its default configuration is 7;
The thresholding of said concussion counter is 30.
5. a digital self-adapting mobile TV direct current biasing compensation arrangement is characterized in that, comprises direct current biasing computing module, parameter update module and direct current biasing compensating module, wherein,
Said direct current biasing computing module is used for the radio frequency receiving signal after digital-to-analogue conversion is carried out reset initialization and the operation that adds up, and obtains the direct current biasing component;
Said parameter update module; Whether be used for carrying out according to said direct current biasing computing module is to reset that carry out for the first time the back, whether anticipated orientation is in the opposite direction with history; And whether the concussion counter surpasses thresholding after adding 1; Carry out whether need the direct current biasing component that said direct current biasing computing module obtains be replaced with historical direct current biasing component, judge the accumulative frequency direction of configuration concussion counter according to indicating historical direction then, and output direct current biasing component;
Said parameter update module; Be further used for judging whether said direct current biasing computing module is carried out is the back execution for the first time that resets, if then use the direct current biasing component that said direct current biasing computing module is obtained to upgrade historical direct current biasing component, indicates historical direction for rising; The concussion counter O reset; Judge the accumulative frequency direction of configuration concussion counter according to indicating historical direction then, and behind the output direct current biasing component, carry out said direct current biasing compensating module;
Carry out for the first time the back if not resetting; The direct current biasing component that then more historical direct current biasing component and said direct current biasing computing module obtain; If anticipated orientation is then judged the concussion counter with historical in the opposite direction,, said concussion counter equals thresholding if adding 1; Then do not upgrade historical direct current biasing component and also do not upgrade historical direction, said concussion counter remains unchanged; If said concussion counter adds 1 less than thresholding, the direct current biasing component that then obtains with said direct current biasing computing module upgrades historical direct current biasing component, upgrades historical direction with current anticipated orientation, and said concussion counter adds 1; If anticipated orientation is identical with historical direction; Then said concussion counter O reset; The direct current biasing component that obtains with said direct current biasing computing module upgrades historical direct current biasing component, upgrades historical direction with current anticipated orientation, judges the accumulative frequency direction of configuration concussion counter according to indicating historical direction then; And behind the output direct current biasing component, carry out said direct current biasing compensating module;
Said direct current biasing compensating module is used for rejecting the direct current biasing component that said parameter update module obtains from receiving signal.
6. device as claimed in claim 5 is characterized in that, said anticipated orientation, and the direct current biasing component that obtains for said direct current biasing computing module is during greater than historical direct current biasing component, then indicates anticipated orientation for rising, otherwise for descending.
7. device as claimed in claim 5; It is characterized in that; Said parameter update module is used for judging the accumulative frequency direction of configuration concussion counter according to indicating historical direction that further for said parameter update module is used for according to indicating historical direction for rising, the accumulative frequency that then shakes counter increases; Otherwise, then reduce.
8. device as claimed in claim 5 is characterized in that, said direct current biasing computing module is further used for the radio frequency receiving signal after digital-to-analogue conversion is carried out reset initialization and through the summary counter operation that adds up, obtains the direct current biasing component; Said summary counter is made up of two adders, and its default configuration is 7;
Vibration counter thresholding in the said parameter update module is 30.
9. device as claimed in claim 5 is characterized in that, said direct current biasing compensating module is the signed number subtracter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100818880A CN101582865B (en) | 2008-05-16 | 2008-05-16 | Direct-current offset compensation method and device of digital self-adapting mobile TV |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100818880A CN101582865B (en) | 2008-05-16 | 2008-05-16 | Direct-current offset compensation method and device of digital self-adapting mobile TV |
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| Publication Number | Publication Date |
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| CN101582865A CN101582865A (en) | 2009-11-18 |
| CN101582865B true CN101582865B (en) | 2012-06-13 |
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| CN2008100818880A Expired - Fee Related CN101582865B (en) | 2008-05-16 | 2008-05-16 | Direct-current offset compensation method and device of digital self-adapting mobile TV |
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| CN105446135B (en) * | 2015-12-30 | 2019-06-28 | 深圳供电局有限公司 | Self-adaptive calibration sampling direct current offset FPGA and intelligent control device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87103771A (en) * | 1986-05-23 | 1988-02-24 | 菲利浦光灯制造公司 | Amplifier installation |
| CN1285996A (en) * | 1997-10-31 | 2001-02-28 | 汤姆森许可公司 | High difinition television vestigial sideband receiver |
| WO2006115707A2 (en) * | 2005-04-06 | 2006-11-02 | Skyworks Solutions, Inc. | Internal calibration system for a radio frequency (rf) transmitter |
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2008
- 2008-05-16 CN CN2008100818880A patent/CN101582865B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87103771A (en) * | 1986-05-23 | 1988-02-24 | 菲利浦光灯制造公司 | Amplifier installation |
| CN1285996A (en) * | 1997-10-31 | 2001-02-28 | 汤姆森许可公司 | High difinition television vestigial sideband receiver |
| WO2006115707A2 (en) * | 2005-04-06 | 2006-11-02 | Skyworks Solutions, Inc. | Internal calibration system for a radio frequency (rf) transmitter |
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Application publication date: 20091118 Assignee: SANECHIPS TECHNOLOGY Co.,Ltd. Assignor: ZTE Corp. Contract record no.: 2015440020319 Denomination of invention: Direct-current offset compensation method and device of digital self-adapting mobile TV Granted publication date: 20120613 License type: Common License Record date: 20151123 |
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