CN103916343A - I/Q unbalance correction method and device used for wireless local area network device - Google Patents
I/Q unbalance correction method and device used for wireless local area network device Download PDFInfo
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Abstract
The invention provides an I/Q unbalance correction method and device used for a wireless local area network device. The device is formed by transmitter I/Q unbalance estimation and correction and receiver I/Q unbalance estimation and correction. In order to obtain the I/Q amplitude mismatch and phase mismatch coefficients of a transmitter and a receiver, the device estimates mismatch parameters through a one-dimensional scanning method firstly, and then, inputs baseband signals to an amplitude and phase unbalance correction module based on the estimated mismatch parameters, and thus mismatch errors are corrected.
Description
Technical field
For an IQ disequilibrium regulating method and apparatus for WLAN devices, it belongs to digital communication technology field, relates to WLAN devices transmitter and receiver IQ imbalance is proofreaied and correct.
Background technology
Wireless communication system adopts the mode of quadrature modulation demodulation conventionally, is divided into that amplitude is consistent, the IQ two-way of quadrature in phase is processed by complex signal.When the phase difference between the local mixer signal of homophase (I) and orthogonal phase (Q) is not accurate 90 while spending, IQ two-way has produced phase mismatch.The amplitude mismatch of IQ two-way is to be caused by the inconsistency of frequency mixer, filter and D and D/A converter.Transmitter IQ width phase mismatch and receiver IQ width phase mismatch can produce image signal, cause signal to noise ratio to decline, and also can have influence on the channel estimating of mirror image subcarrier for multi-carrier communications systems.Simultaneously for the throughput communication system that improves communication is being used more complicated modulation system, as 802.11n has used 64QAM and OFDM.These complicated modulation techniques become unavoidable problem in design for the susceptibility of the width phase mismatch between homophase (I) and orthogonal phase (Q) path of this Receiver And Transmitter of direct conversion cheaply.Now eliminate IQ unbalanced error and also become a part essential in system.
At present, exist two classes to eliminate the unbalanced method of IQ: one, static shift correction; Two, dynamic calibration.Static shift correction is the IQ mismatch parameter that draws transmitter and receiver in chip board test process, and the mismatch parameter of measuring is fixed in IQ disequilibrium regulating module.The advantage of the method is to implement simply, if the IQ mismatch error that shortcoming is chip changes after work a period of time, the method cannot be proofreaied and correct again.Dynamic calibration refers to be estimated transmitter and receiver IQ mismatch parameter after chip power and by the parameter read-in IQ disequilibrium regulating module estimating.The method is compared with static shift correction, if the IQ unbalanced error that advantage is chip changes after a period of time in work, the method can again estimate and proofread and correct IQ mismatch, shortcoming be implement more complicated.
Summary of the invention
In order to solve the problem of homophase and quadrature branch width phase mismatch affects quadrature receiver dynamic range and receptivity, the present invention adopts and a kind ofly estimates that by one-dimensional scanning width phase mismatch parameter then inputs by baseband signal the method that the disequilibrium regulating module based on this mismatch parameter is processed again.Can eliminate the IQ mismatch error of transmitter and receiver by the method.
The invention provides a kind of method and apparatus of the orthogonal inconsistency of transmitter and receiver IQ passage being estimated and being proofreaied and correct for WLAN devices, as shown in Figure 1 and Figure 2.In the method transmitter IQ mismatch repair be by sinusoidal test baseband signal through transmitter IQ disequilibrium regulating module by after RF transmitting path, Envelope Detector and LPF, signal storage after ADC sampling, in SRAM, is calculated to signal energy and adjusted transmitter and proofread and correct base band parameter.
Complete after single pass, adjust corresponding base band parameter according to sweep limits and the gradient of the width phase mismatch parameter of setting.
The present invention utilizes the method that one dimension successively scans to estimate transmitter and receiver width phase mismatch parameter, then baseband signal is inputted in IQ disequilibrium regulating model, realizes the correction of error, and the method comprises the following steps:
1) first transmitter amplitude mismatch parameter is estimated, stationary transmitter phase mismatch parameter, one dimension successively scans transmitter amplitude mismatch parameter, each sweep amplitude mismatch parameter all can produce a baseband signal transmitting terminal is corresponding, finds out in transmitter range parameter scanning process hour corresponding transmitter amplitude mismatch parameter of baseband signal energy;
2) the transmitter amplitude mismatch parameter estimating is fixed, one dimension successively scans transmitter phase mismatch parameter again, each scanning phase mismatch parameter all can produce a baseband signal transmitting terminal is corresponding, finds out in transmitter phase mismatch parameter scanning process hour corresponding transmitter phase mismatch parameter of baseband signal energy;
3) the transmitter amplitude mismatch parameter, the phase mismatch parameter that estimate are fixed, receiver amplitude mismatch parameter is estimated, fixed receiver phase mismatch parameter, one dimension is scanning radio amplitude mismatch parameter successively, each sweep amplitude mismatch parameter all can produce a baseband signal at transmitting terminal, finds out in receiver amplitude mismatch parameter scanning process hour corresponding receiver amplitude mismatch parameter of baseband signal energy;
4) the receiver amplitude mismatch parameter estimating is fixed, one dimension is scanning radio phase mismatch parameter successively, each scanning phase mismatch parameter all can produce a baseband signal at transmitting terminal, find out hour corresponding receiver phase mismatch parameter of baseband signal energy in this scanning process, the receiver phase mismatch parameter estimating is fixed;
5) by above-mentioned steps, estimate respectively amplitude, the phase mismatch parameter of amplitude, phase mismatch parameter and the receiver of transmitter, realize baseband signal mismatch repair.
Wherein estimate the degree of transmitter IQ amplitude and unbalance in phase error, the degree based on institute's estimation error is carried out transmitter IQ disequilibrium regulating, to reduce the impact of this error; The degree of estimation receiver IQ amplitude and unbalance in phase error, the degree based on institute's estimation error is carried out receiver IQ disequilibrium regulating, to reduce the impact of this error; The scope of estimating according to IQ unbalanced error and precision determine scope and the gradient of corresponding one-dimensional scanning.
Brief description of the drawings
Fig. 1 is the uneven estimation of transmitter IQ and corrective system block diagram.
Fig. 2 is the uneven estimation of receiver IQ and corrective system block diagram.
Fig. 3 is transmitter IQ disequilibrium regulating module.
Fig. 4 is receiver IQ disequilibrium regulating module.
Fig. 5 is the structure chart of specific implementation.
Embodiment
Transmitter IQ imbalance model:
The baseband complex signal of transmitting can be expressed as:
v
bb(t)＝I(t)+jQ(t)
Suppose not have in the situation of direct current biasing, the output signal after frequency mixer can be expressed as so:
Gain is transmitter IQ amplitude imbalance coefficient;
it is transmitter IQ unbalance in phase coefficient;
Therefore, corresponding IQ mismatch baseband signal is:
Can proofread and correct the baseband signal of transmitter IQ mismatch by following transmitter calibration model:
Receiver IQ imbalance model:
Radio frequency reception to signal can be expressed as:
v
rf(t)＝I(t)cos(ω
RFt)-Q(t)sin(ω
RFt)
Suppose not have in the situation of direct current biasing, after down-conversion and low pass filter, exist the baseband signal of IQ mismatch to be expressed as:
Gain is receiver IQ amplitude imbalance coefficient;
it is receiver IQ unbalance in phase coefficient;
Can proofread and correct receiver IQ mismatch signal by following receiver correction module:
Based on content of the present invention, be applied to IQ mismatch problems in correcting wireless lan device, provide concrete implementation step.
Transmitter trimming process:
1. after transmitter IQ disequilibrium regulating process starts, radio-frequency (RF) switch is set, transmitter path is connected with Envelope Detector.Write sinusoidal signal wave file by ahb bus to SRAM.
2. write after test waveform file, initial transmitter amplitude mismatch and phase mismatch parameter are set.Control module is read test wave file transmission from SRAM, after wait certain hour, the data that receive from ADC stored into SRAM, and after having stored, reading out data.The reception signal reading is carried out to DFT computing, record corresponding signal energy.
3. reset transmitter amplitude mismatch and phase mismatch parameter, repeating step 2 according to scanning rule.
4. according to the signal energy calculating in each scanning process of storage, search out transmitter amplitude mismatch and phase mismatch parameter corresponding under signal energy minimum, be updated in register corresponding to amplitude mismatch and phase mismatch in transmitter calibration model, transmitter correction module be by initial digital IQ baseband signal through following calibration model:
Deduct and be multiplied by amplitude mismatch gain after the sine value of initial Q road signal times with half phase mismatch angle and obtain revised digital I roadbed band signal with the cosine value of half phase mismatch angle by initial I road signal times, initial Q road signal times is deducted to initial I road signal times with the cosine value of half phase mismatch angle and obtain revised digital Q roadbed band signal with the sine value of half phase mismatch angle.
Receiver trimming process:
1. after receiver IQ disequilibrium regulating process starts, radio-frequency (RF) switch is set, transmitter path is connected with receiver path.Write sinusoidal signal wave file by ahb bus to SRAM.
2. write after test waveform file, initial receiver amplitude mismatch and phase mismatch parameter are set.Control module is read test wave file transmission from SRAM, after wait certain hour, the data that receive from ADC is stored into SRAM, has stored after signal reading out data.To read reception signal and carry out DFT computing, record corresponding signal energy.
3. reset receiver amplitude mismatch and phase mismatch parameter, repeating step 2 according to scanning rule.
4. according to the signal energy calculating in each scanning process of storage, search out receiver amplitude mismatch and phase mismatch parameter corresponding under signal energy minimum, be updated in the register that receiver amplitude mismatch and phase mismatch are corresponding, receiver correction module is by the initial following calibration model of digital IQ base band process:
Be multiplied by again and deduct initial Q road signal times after amplitude mismatch gain and obtain revised digital I roadbed band signal with the sine value of half phase mismatch angle with the cosine value of half phase mismatch angle by initial I road signal times, initial Q road signal times is deducted after initial I road signal times is multiplied by amplitude mismatch gain again with the sine value of half phase mismatch angle and obtains revised Q roadbed band signal with the cosine value of half phase mismatch angle.
System described herein be by base band, RF and compound mode realize.Fig. 5 is the general structure realizing.
The technology of the present invention method has more than and is confined to above-described embodiment, and other modification of the present invention and embodiment will be obvious to those skilled in the art's help.
Claims (2)
1. carry out a device for IQ disequilibrium regulating for WLAN devices, this device contains MCU, disequilibrium regulating module, the loop of rf, and memory module, DAC module, ADC module, energy computing module and adjustment base band parameter module, wherein:
MCU controls startup, end and the switching of IQ disequilibrium regulating pattern and returns normal transceiver mode; IQ disequilibrium regulating pattern is switched to the loop of rf under IQ disequilibrium regulating pattern after starting;
Disequilibrium regulating module arranges mismatch parameter, and digital IQ baseband signal is revised;
The loop of rf is under disequilibrium regulating pattern, by switching over, baseband signal is processed;
Memory module is used for storing through the loop of rf baseband signal after treatment;
Digital baseband signal is reverted to analog baseband signal by DAC module;
Analog baseband signal is sampled into digital baseband signal by ADC module;
Energy computing module calculates the energy of the effective frequency of baseband signal in memory module;
Adjusting base band parameter module is according to the result calculating in trimming process, the mismatch parameter in disequilibrium regulating module to be adjusted;
Baseband signal is by after disequilibrium regulating module, enter in respective radio-frequency loop by DAC module, analog signal is deposited in memory module after ADC module samples becomes digital signal, energy computing module calculates the corresponding frequency energy of baseband signal in memory module, adjusts base band parameter module and according to the result calculating, the mismatch parameter in base band disequilibrium regulating module is adjusted.
2. a method of transmitter and receiver IQ imbalance being proofreaied and correct for WLAN devices, be applied in device claimed in claim 1, it is characterized in that utilizing the method that one dimension successively scans to estimate transmitter and receiver width phase mismatch parameter, then baseband signal is inputted in IQ disequilibrium regulating model, realize the correction of error, the method comprises the following steps:
1) first transmitter amplitude mismatch parameter is estimated, stationary transmitter phase mismatch parameter, one dimension successively scans transmitter amplitude mismatch parameter, each sweep amplitude mismatch parameter all can produce a baseband signal transmitting terminal is corresponding, finds out in transmitter range parameter scanning process hour corresponding transmitter amplitude mismatch parameter of baseband signal energy;
2) the transmitter amplitude mismatch parameter estimating is fixed, one dimension successively scans transmitter phase mismatch parameter again, each scanning phase mismatch parameter all can produce a baseband signal transmitting terminal is corresponding, finds out in transmitter phase mismatch parameter scanning process hour corresponding transmitter phase mismatch parameter of baseband signal energy;
3) the transmitter amplitude mismatch parameter, the phase mismatch parameter that estimate are fixed, receiver amplitude mismatch parameter is estimated, fixed receiver phase mismatch parameter, one dimension is scanning radio amplitude mismatch parameter successively, each sweep amplitude mismatch parameter all can produce a baseband signal at transmitting terminal, finds out in receiver amplitude mismatch parameter scanning process hour corresponding receiver amplitude mismatch parameter of baseband signal energy;
4) the receiver amplitude mismatch parameter estimating is fixed, one dimension is scanning radio phase mismatch parameter successively, each scanning phase mismatch parameter all can produce a baseband signal at transmitting terminal, find out hour corresponding receiver phase mismatch parameter of baseband signal energy in this scanning process, the receiver phase mismatch parameter estimating is fixed;
5) by above-mentioned steps, estimate respectively amplitude mismatch parameter, the phase mismatch parameter of amplitude mismatch parameter, phase mismatch parameter and the receiver of transmitter, realize baseband signal mismatch repair.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104219186A (en) * | 2014-09-04 | 2014-12-17 | 中国电子科技集团公司第二十九研究所 | Simulated IQ modulation error correction method based on IQ baseband signal amplitude regulation |
| CN105162533A (en) * | 2015-07-24 | 2015-12-16 | 天津大学 | Transmitter amplitude imbalance and phase imbalance measuring method |
| CN105450178A (en) * | 2015-12-29 | 2016-03-30 | 江苏星宇芯联电子科技有限公司 | Mixer circuit capable of correcting IQ mismatch |
| CN106058480A (en) * | 2016-06-01 | 2016-10-26 | 西安电子工程研究所 | Arbitrary polarized wave generation and calibration methods |
| CN109474553A (en) * | 2018-12-06 | 2019-03-15 | 上海移芯通信科技有限公司 | A kind of estimation method and system of the distorted signals parameter for terminal transmission access |
| CN110708084A (en) * | 2019-10-15 | 2020-01-17 | 成都振芯科技股份有限公司 | Envelope detection based originating IQ correction circuit and method |
| CN110943791A (en) * | 2019-11-26 | 2020-03-31 | 北京中电华大电子设计有限责任公司 | Test platform and IQ mismatch test method for BLE radio frequency transceiver system |
| CN113079117A (en) * | 2020-01-04 | 2021-07-06 | 武汉芯泰科技有限公司 | Method and device for estimating IQ mismatch of receiving link |
| CN113556302A (en) * | 2021-07-19 | 2021-10-26 | 上海擎昆信息科技有限公司 | Transmitter IQ imbalance correction method and device |
| TWI774254B (en) * | 2021-03-02 | 2022-08-11 | 瑞昱半導體股份有限公司 | Wireless transceiver having in-phase quadrature-phase calibration function |
| CN116633456A (en) * | 2023-07-24 | 2023-08-22 | 高拓讯达(北京)微电子股份有限公司 | Calibration method and device for broadband radio frequency system signals and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6687311B1 (en) * | 2000-02-15 | 2004-02-03 | General Instrument Corporation | Direct QAM modulator with digital feedback control and complex pre-equalization for phase and amplitude distortion |
| US6862440B2 (en) * | 2002-05-29 | 2005-03-01 | Intel Corporation | Method and system for multiple channel wireless transmitter and receiver phase and amplitude calibration |
| US8208530B2 (en) * | 2005-03-14 | 2012-06-26 | Broadcom Corporation | Apparatus and method for correcting IQ imbalance |
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| CN104219186A (en) * | 2014-09-04 | 2014-12-17 | 中国电子科技集团公司第二十九研究所 | Simulated IQ modulation error correction method based on IQ baseband signal amplitude regulation |
| CN105162533A (en) * | 2015-07-24 | 2015-12-16 | 天津大学 | Transmitter amplitude imbalance and phase imbalance measuring method |
| CN105162533B (en) * | 2015-07-24 | 2017-10-31 | 天津大学 | Transmitter amplitude imbalance and phase imbalance measuring method |
| CN105450178A (en) * | 2015-12-29 | 2016-03-30 | 江苏星宇芯联电子科技有限公司 | Mixer circuit capable of correcting IQ mismatch |
| CN105450178B (en) * | 2015-12-29 | 2018-05-25 | 江苏星宇芯联电子科技有限公司 | A kind of mixer of recoverable IQ mismatches |
| CN106058480A (en) * | 2016-06-01 | 2016-10-26 | 西安电子工程研究所 | Arbitrary polarized wave generation and calibration methods |
| CN109474553A (en) * | 2018-12-06 | 2019-03-15 | 上海移芯通信科技有限公司 | A kind of estimation method and system of the distorted signals parameter for terminal transmission access |
| CN110708084A (en) * | 2019-10-15 | 2020-01-17 | 成都振芯科技股份有限公司 | Envelope detection based originating IQ correction circuit and method |
| CN110943791A (en) * | 2019-11-26 | 2020-03-31 | 北京中电华大电子设计有限责任公司 | Test platform and IQ mismatch test method for BLE radio frequency transceiver system |
| CN110943791B (en) * | 2019-11-26 | 2022-10-14 | 北京中电华大电子设计有限责任公司 | Test platform and IQ mismatch test method for BLE radio frequency transceiver system |
| CN113079117A (en) * | 2020-01-04 | 2021-07-06 | 武汉芯泰科技有限公司 | Method and device for estimating IQ mismatch of receiving link |
| CN113079117B (en) * | 2020-01-04 | 2022-06-21 | 武汉芯泰科技有限公司 | Method and device for estimating IQ mismatch of receiving link |
| TWI774254B (en) * | 2021-03-02 | 2022-08-11 | 瑞昱半導體股份有限公司 | Wireless transceiver having in-phase quadrature-phase calibration function |
| CN113556302A (en) * | 2021-07-19 | 2021-10-26 | 上海擎昆信息科技有限公司 | Transmitter IQ imbalance correction method and device |
| CN113556302B (en) * | 2021-07-19 | 2023-12-05 | 上海擎昆信息科技有限公司 | IQ imbalance correction method and device for transmitter |
| CN116633456A (en) * | 2023-07-24 | 2023-08-22 | 高拓讯达(北京)微电子股份有限公司 | Calibration method and device for broadband radio frequency system signals and electronic equipment |
| CN116633456B (en) * | 2023-07-24 | 2023-09-19 | 高拓讯达(北京)微电子股份有限公司 | Calibration method and device for broadband radio frequency system signals and electronic equipment |
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