CN101442511A - Method and apparatus for improving radio frequency index of zero intermediate frequency transmitter - Google Patents
Method and apparatus for improving radio frequency index of zero intermediate frequency transmitter Download PDFInfo
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- CN101442511A CN101442511A CNA2007101937295A CN200710193729A CN101442511A CN 101442511 A CN101442511 A CN 101442511A CN A2007101937295 A CNA2007101937295 A CN A2007101937295A CN 200710193729 A CN200710193729 A CN 200710193729A CN 101442511 A CN101442511 A CN 101442511A
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Abstract
The invention relates to a method and a device for improving radio frequency indexes of a zero medium frequency communicator. IQ signals are subjected to DC bias, gain and phase calibration by a digital processor before being subjected to digital-to-analog conversion, so that analog I signals and analog Q signals arriving at an IQ modulator have the same DC bias and the same plus and have a phase difference of 90 degrees; therefore the invention achieves the aims of compensating local oscillation leakage and inhibiting sidebands of the zero medium frequency communicator, optimizes the radio frequency indexes such as EVM and ORIGIN OFFSET, and is convenient to realize.
Description
Technical field
The present invention relates to wireless communication technology field, specifically improve the method and the device of zero intermediate frequency sender radio-frequency (RF) index.
Background technology
Zero intermediate frequency (directly up-conversion) is exactly that baseband signal directly is modulated to a kind of modulation system on the radio-frequency carrier.This modulation system does not need intermediate frequency amplification, filtering and frequency conversion part, and has relaxed the performance requirement to the radio frequency part filter, even need not add the radio frequency Surface Acoustic Wave Filter, thereby has greatly reduced volume, weight, power consumption and the cost of transmitter.Practice shows that the PCB of zero intermediate frequency sender (printedcircuit board, printed circuit board (PCB)) layout has only the sixth of common sender.But this technology is very responsive to the phase place of orthogonal demodulation signal and orthogonal local oscillation signal and amplitude imbalance and direct current offset distortion, and therefore can cause serious sideband and local-oscillator leakage, cause EVM (error vector magnitude) and ORIGIN OFFSET indexs such as (initial point skews) to worsen.In order to reduce sideband and local-oscillator leakage, improve zero intermediate frequency sender radio-frequency (RF) index, need calibrate I/Q (quadrature in phase that the modulation input designs in order to improve band efficiency gets two paths of signals, i.e. I road signal and Q road signal).A kind of I/Q calibration steps of prior art is a circuit of adjusting radio frequency part, make I road analog signal consistent with the cabling of Q road analog signal, but this method has increased the work difficulty of Radio Frequency Engineer, and effect is also bad as far as possible.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method and device that improves zero intermediate frequency sender radio-frequency (RF) index, the IQ signal is carried out the calibration of direct current biasing, gain, phase place at digital-to-analog conversion (DAC) numerical portion before, reach purpose, optimize radio-frequency (RF) index such as EVM and ORIGIN OFFSET compensation of zero intermediate frequency sender local-oscillator leakage and sideband supression.
In order to address the above problem, the method for raising zero intermediate frequency sender radio-frequency (RF) index provided by the invention comprises:
The baseband signal that upper layer device sends is modulated the baseband modulation step that produces I way word signal and Q way word signal;
Described I road is become the digital-to-analogue conversion step of I road analog signal and Q road analog signal with Q way word conversion of signals;
Described I road analog signal and Q road analog signal are advanced the IQ modulation step that IQ modulated and exported radiofrequency signal;
Before described digital-to-analogue conversion step, also comprise:
The set-up procedure of utilizing digital processing unit that described I way word signal and Q way word signal are adjusted.
Further, the described adjustment that utilizes digital processing unit that described I way word signal and Q way word signal are carried out comprises that gain adjustment, biasing adjust and the phase place adjustment.
Further, the method for described gain adjustment is, parameter adjusted in described I way word signal and Q way word signal and a gain multiplied each other, and is adjusted into the gain of I way word signal and Q way word signal identical.
Further, the method for described biasing adjustment is, described I way word signal and Q way word signal and a biasing are adjusted the parameter addition, is adjusted into the biasing of I way word signal and Q way word signal identical.
Further, in the described set-up procedure, described I way word signal and Q way word signal phase be adjusted into differ 90 degree.
The device of raising zero intermediate frequency sender radio-frequency (RF) index of the present invention comprises baseband modulator, digital to analog converter and IQ modulator, also comprises digital processing unit; Wherein,
Described baseband modulator is used for baseband signal is modulated, and produces I way word signal and Q way word signal;
Described digital processing unit is used for I way word signal and Q way word signal that described baseband modulator modulation produces are adjusted;
Described digital to analog converter is used for the adjusted I way of described digital processing unit word signal is become I road analog signal and Q road analog signal with Q way word conversion of signals;
Described IQ modulator is used for I road analog signal after the described digital to analog converter conversion and Q road analog signal are advanced the IQ modulation, and the output radiofrequency signal.
Further, described digital processing unit is CPU, digital information processor or field programmable gate array.
Further, described digital processing unit comprises fader, bias regulator and phase regulator, wherein,
Described fader is used for the I way word signal of described baseband modulator modulation generation and the gain of Q way word signal are adjusted;
Described bias regulator is used for the I way word signal of described baseband modulator modulation generation and the biasing of Q way word signal are adjusted;
Described phase regulator is used for the I way word signal of described baseband modulator modulation generation and the phase place of Q way word signal are adjusted.
Further,
Described fader is used for multiplying each other with gain adjustment parameter being adjusted signal, and adjustment gains;
Described bias regulator is used for adjusting parameter addition, the adjustment of setovering with being adjusted signal with biasing.
Further,
Described fader is used for that parameter is adjusted in described I way word signal and Q way word signal and a gain and multiplies each other, and is adjusted into the gain of described I way word signal and Q way word signal identical;
Described bias regulator is used for described I way word signal and Q way word signal and a biasing are adjusted the parameter addition, is adjusted into the biasing of described I way word signal and Q way word signal identical;
Described phase regulator is used for phase place with described I way word signal and Q way word signal and is adjusted into and differs 90 degree.
The present invention adopts digital processing unit the IQ signal to be carried out the calibration of direct current biasing, gain, phase place the IQ signal being carried out digital-to-analog conversion (DAC) before, feasible Simulation with I and the Q signal that arrives the IQ modulator, direct current biasing is identical with gain, phase phasic difference 90 degree, reach purpose to compensation of zero intermediate frequency sender local-oscillator leakage and sideband supression, optimized radio-frequency (RF) index such as EVM and ORIGIN OFFSET, and realized conveniently.
Description of drawings
Fig. 1 is the flow chart of the method for raising zero intermediate frequency sender radio-frequency (RF) index of the present invention;
Fig. 2 is the structure chart of the device of raising zero intermediate frequency sender radio-frequency (RF) index of the present invention.
Embodiment
The present invention proposes on the principle of analyzing the generation of zero intermediate frequency sender local-oscillator leakage and sideband, its key is the powerful advantages of performance digital processing unit to sequential logic and signal processing, before the digital-to-analogue converter, by digital processing unit to the digital signal adjustment, make that the analog I signal direct current biasing that enters the IQ modulator is identical with gain, phase phasic difference 90 degree reach the purpose that improves the sender radio-frequency (RF) index.
The invention will be further described below in conjunction with drawings and Examples, but not as a limitation of the invention.
As shown in Figure 1, the method for raising zero intermediate frequency sender radio-frequency (RF) index of the present invention may further comprise the steps:
Step 101: baseband signal is modulated, produce I way word signal and Q way word signal;
Step 102: utilize digital processing unit that described I way word signal and Q way word signal are adjusted;
Step 103: described adjusted I road is become I road analog signal and Q road analog signal with Q way word conversion of signals;
Step 104: described I road analog signal and Q road analog signal are advanced IQ modulation and output radiofrequency signal.
Wherein, in the described step 102, the adjustment that utilizes digital processing unit that I way word signal and Q way word signal are carried out comprises that gain adjustment, biasing adjust and the phase place adjustment.Gain is adjusted gain with I way word signal and Q way word signal and is adjusted into identically, and method of adjustment is will be adjusted signal times to adjust parameter (IQGAIN) with a gain, changes parameter I QGAIN, can change the gain of IQ signal; Biasing is adjusted biasing with I way word signal and Q way word signal and is adjusted into identically, and method of adjustment is to add that with being adjusted signal a biasing adjusts parameter (IQ_DCOFFSET), changes parameter I Q_DCOFFSET, can change the direct current biasing of IQ signal; The phase place adjustment is adjusted into the phase place of I way word signal and Q way word signal and differs 90 degree.
Because individual difference, the gain adjustment parameter (IQGAIN) of each veneer, direct current biasing are adjusted parameter (IQ_DCOFFSET), phase place adjustment parameter (IQ_delay) is different.In the practical application, during debugging single board, from small to large, parameters such as change IQGAIN, IQ_DCOFFSET, the IQ_delay of order can make the parameters such as IQGAIN, IQ_DCOFFSET, IQ_delay of the every index optimum of veneer output signal deposit among the ROM on the veneer then.During the sender real work, IQGAIN, IQ_DCOFFSET, IQ_delay parameter that digital processing unit will deposit among the ROM are taken out, and are configured in the base band calibrator and go, and reach the purpose that improves radio-frequency (RF) index.
In the described step 104, the clock that adopts local oscillator oscillator 11 to provide carries out the IQ modulation, the output radiofrequency signal to the I road analog signal and the Q road analog signal of output in the step 103.
As shown in Figure 2, the device of raising zero intermediate frequency sender radio-frequency (RF) index of the present invention comprises baseband modulator 201, digital to analog converter 203 and IQ modulator 204, also comprises digital processing unit 202; Wherein,
Digital to analog converter 203 is used for described digital processing unit 202 adjusted I way word signals are become I road analog signal and Q road analog signal with Q way word conversion of signals, and the I road analog signal after will changing and Q road analog signal output to IQ modulator 204;
Wherein, digital processing unit can be CPU, also can be DSP (Digital Signal Processing, digital information processor) or FPGA (Field-Programmable Gate Array, field programmable gate array).
The digital processing implement body comprises fader 205, bias regulator 206 and phase regulator 207, wherein,
The above embodiment only is preferred embodiment of the present invention, and 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 skilled in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong within the protection range of the appended claim of the present invention.
Claims (10)
1, a kind of method that improves zero intermediate frequency sender radio-frequency (RF) index comprises:
The baseband signal that upper layer device sends is modulated the baseband modulation step that produces I way word signal and Q way word signal;
Described I road is become the digital-to-analogue conversion step of I road analog signal and Q road analog signal with Q way word conversion of signals;
Described I road analog signal and Q road analog signal are advanced the IQ modulation step that IQ modulated and exported radiofrequency signal;
It is characterized in that, before described digital-to-analogue conversion step, also comprise:
The set-up procedure of utilizing digital processing unit that described I way word signal and Q way word signal are adjusted.
2, the method for claim 1 is characterized in that, the described adjustment that utilizes digital processing unit that described I way word signal and Q way word signal are carried out comprises that gain adjustment, biasing adjust and the phase place adjustment.
3, method as claimed in claim 2 is characterized in that, the method for described gain adjustment is, parameter is adjusted in described I way word signal and Q way word signal and a gain multiplied each other, and is adjusted into the gain of I way word signal and Q way word signal identical.
4, method as claimed in claim 2 is characterized in that, the method for described biasing adjustment is, described I way word signal and Q way word signal and a biasing are adjusted the parameter addition, is adjusted into the biasing of I way word signal and Q way word signal identical.
5, method as claimed in claim 2 is characterized in that, in the described set-up procedure, described I way word signal and Q way word signal phase is adjusted into differs 90 degree.
6, a kind of device that improves zero intermediate frequency sender radio-frequency (RF) index comprises baseband modulator, digital to analog converter and IQ modulator, it is characterized in that, also comprises digital processing unit; Wherein,
Described baseband modulator is used for baseband signal is modulated, and produces I way word signal and Q way word signal;
Described digital processing unit is used for I way word signal and Q way word signal that described baseband modulator modulation produces are adjusted;
Described digital to analog converter is used for the adjusted I way of described digital processing unit word signal is become I road analog signal and Q road analog signal with Q way word conversion of signals;
Described IQ modulator is used for I road analog signal after the described digital to analog converter conversion and Q road analog signal are advanced the IQ modulation, and the output radiofrequency signal.
7, device as claimed in claim 6 is characterized in that, described digital processing unit is CPU, digital information processor or field programmable gate array.
8, device as claimed in claim 6 is characterized in that, described digital processing unit comprises fader, bias regulator and phase regulator, wherein,
Described fader is used for the I way word signal of described baseband modulator modulation generation and the gain of Q way word signal are adjusted;
Described bias regulator is used for the I way word signal of described baseband modulator modulation generation and the biasing of Q way word signal are adjusted;
Described phase regulator is used for the I way word signal of described baseband modulator modulation generation and the phase place of Q way word signal are adjusted.
9, device as claimed in claim 8 is characterized in that,
Described fader is used for multiplying each other with gain adjustment parameter being adjusted signal, and adjustment gains;
Described bias regulator is used for adjusting parameter addition, the adjustment of setovering with being adjusted signal with biasing.
10, device as claimed in claim 8 is characterized in that,
Described fader is used for that parameter is adjusted in described I way word signal and Q way word signal and a gain and multiplies each other, and is adjusted into the gain of described I way word signal and Q way word signal identical;
Described bias regulator is used for described I way word signal and Q way word signal and a biasing are adjusted the parameter addition, is adjusted into the biasing of described I way word signal and Q way word signal identical;
Described phase regulator is used for phase place with described I way word signal and Q way word signal and is adjusted into and differs 90 degree.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101937295A CN101442511A (en) | 2007-11-23 | 2007-11-23 | Method and apparatus for improving radio frequency index of zero intermediate frequency transmitter |
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| CNA2007101937295A CN101442511A (en) | 2007-11-23 | 2007-11-23 | Method and apparatus for improving radio frequency index of zero intermediate frequency transmitter |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025666A (en) * | 2010-12-15 | 2011-04-20 | 中兴通讯股份有限公司 | Method and device for realizing IQ signal correction in base station transmitter equipment |
| CN103701754A (en) * | 2013-12-23 | 2014-04-02 | 北京航天测控技术有限公司 | Automatic calibration method of vector modulation signal |
| CN103701755B (en) * | 2014-01-09 | 2017-02-08 | 上海创远仪器技术股份有限公司 | Method for estimating IQ imbalance in communication system |
| CN106788355A (en) * | 2016-11-15 | 2017-05-31 | 中国电子科技集团公司第四十研究所 | A kind of digital calibrating method of baseband signal gain balance |
| CN107809276A (en) * | 2017-10-10 | 2018-03-16 | 中国电子科技集团公司第五十四研究所 | Minimize inexpensive satellite data transmission equipment |
| WO2018121111A1 (en) * | 2016-12-26 | 2018-07-05 | 中兴通讯股份有限公司 | Method and device for eliminating local oscillation leakage |
| CN109039467A (en) * | 2018-06-26 | 2018-12-18 | 天津师范大学 | The permanent envelope light ofdm signal modulation demodulation system of standard and its modulation-demo-demodulation method based on I/Q modulator |
| CN110865235A (en) * | 2019-11-29 | 2020-03-06 | 山东浪潮人工智能研究院有限公司 | Automatic calibration system and method for frequency mixer |
| CN115296969A (en) * | 2022-07-28 | 2022-11-04 | 湖南迈克森伟电子科技有限公司 | Method and system for adjusting phase of transmission code element |
-
2007
- 2007-11-23 CN CNA2007101937295A patent/CN101442511A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025666B (en) * | 2010-12-15 | 2015-06-03 | 中兴通讯股份有限公司 | Method and device for realizing IQ signal correction in base station transmitter equipment |
| CN102025666A (en) * | 2010-12-15 | 2011-04-20 | 中兴通讯股份有限公司 | Method and device for realizing IQ signal correction in base station transmitter equipment |
| CN103701754A (en) * | 2013-12-23 | 2014-04-02 | 北京航天测控技术有限公司 | Automatic calibration method of vector modulation signal |
| CN103701754B (en) * | 2013-12-23 | 2017-04-19 | 北京航天测控技术有限公司 | Automatic calibration method of vector modulation signal |
| CN103701755B (en) * | 2014-01-09 | 2017-02-08 | 上海创远仪器技术股份有限公司 | Method for estimating IQ imbalance in communication system |
| CN106788355B (en) * | 2016-11-15 | 2020-04-28 | 中国电子科技集团公司第四十一研究所 | Digital calibration method for baseband signal gain balance |
| CN106788355A (en) * | 2016-11-15 | 2017-05-31 | 中国电子科技集团公司第四十研究所 | A kind of digital calibrating method of baseband signal gain balance |
| WO2018121111A1 (en) * | 2016-12-26 | 2018-07-05 | 中兴通讯股份有限公司 | Method and device for eliminating local oscillation leakage |
| CN107809276A (en) * | 2017-10-10 | 2018-03-16 | 中国电子科技集团公司第五十四研究所 | Minimize inexpensive satellite data transmission equipment |
| CN107809276B (en) * | 2017-10-10 | 2020-02-07 | 中国电子科技集团公司第五十四研究所 | Miniaturized satellite data transmission equipment |
| CN109039467A (en) * | 2018-06-26 | 2018-12-18 | 天津师范大学 | The permanent envelope light ofdm signal modulation demodulation system of standard and its modulation-demo-demodulation method based on I/Q modulator |
| CN110865235A (en) * | 2019-11-29 | 2020-03-06 | 山东浪潮人工智能研究院有限公司 | Automatic calibration system and method for frequency mixer |
| CN115296969A (en) * | 2022-07-28 | 2022-11-04 | 湖南迈克森伟电子科技有限公司 | Method and system for adjusting phase of transmission code element |
| CN115296969B (en) * | 2022-07-28 | 2023-06-16 | 湖南迈克森伟电子科技有限公司 | Method and system for adjusting phase of transmitting code element |
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Application publication date: 20090527 |