CN1984101B - Method for aligning receiver I/Q in TDD system and receiver-transmitter platform - Google Patents
Method for aligning receiver I/Q in TDD system and receiver-transmitter platform Download PDFInfo
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- CN1984101B CN1984101B CN2005101346277A CN200510134627A CN1984101B CN 1984101 B CN1984101 B CN 1984101B CN 2005101346277 A CN2005101346277 A CN 2005101346277A CN 200510134627 A CN200510134627 A CN 200510134627A CN 1984101 B CN1984101 B CN 1984101B
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Abstract
I/Q imbalance calibration method of receiver machine in TDD system and receiving-transmitting machine platform. The said method comprises: enable the communicator in active state, the baseband module produce signals and send to the communicator; enable the receiver machine in active state, receive signals from communicator and send the obtained signal to the baseband module, carry through the I/Q imbalance calibration processing. The invention calibrate the precision of I/Q imbalance of receiver machine to that of communicator according to the characteristic that TDD system receive and transmit same frequency signals and the I/Q accuracy of communicator itself can meet the requirements of I/Q imbalance performance, measure and calibrate I/Q imbalance with the radio-frequency signals the communicator leak on the receiver machine, improves efficiency, reduces requirements to the instrumentation. As this method has extremely high efficiency, thereby it reduces the requirements of system to the integrated circuit (IC) of receiver machine; provide the possibility to reduce the IC cost of the receiver machine.
Description
Technical field
The present invention relates to signal processing technology and detection technique, the unbalanced calibration steps of receiver I/Q in the especially a kind of TDD system, and the transmitter platform that can carry out the I/Q self check.
Background technology
In communication system, transmit and receive link in-phase component I and quadrature component Q and all exist phase place and amplitude imbalance more or less, this I/Q imbalance directly causes transmitting and receiving the deterioration of link signal quality.
At sender one end, general digital circuit can not brought the I/Q imbalance, begins to quadrature up-conversion from DAC, and the consistency of circuit and frequency mixer orthogonality undesirable produced sender I/Q imbalance.Generally speaking, the design of sender hardware circuit can guarantee to reach performance demands: the amplitude imbalance representative value is 0.01dB, extreme case is no more than 0.1dB, the representative value of unbalance in phase is 1 ° to 2 °, extreme case is no more than 3 °, therefore, sender generally needn't be calibrated and promptly satisfy the technical performance requirement.
At receiver one end, no matter be heterodyne system receiver or Direct Conversion receiver, promptly produce the I/Q imbalance from quadrature frequency conversion, though the large scale integration circuit has improved the quadrature performance and the consistency of circuit, but be subjected to the influence of receiver hardware circuit self, the unbalanced technical indicator of I/Q still can not meet the demands, and especially unbalance in phase is bigger.Generally speaking, the representative value of the amplitude imbalance of receiver is 0.01dB, and the representative value of unbalance in phase does not wait from 3 ° to 12 °, and discreteness is very big.The imbalance of phase place causes the receiver signal quality obviously to worsen, thereby only depends on the receiver circuit design to guarantee, receiver I/Q imbalance is calibrated become urgent and necessary.
The unbalanced calibration of receiver I/Q can be divided into two kinds of hardware calibration and software calibrations.The unbalanced hardware calibration of receiver I/Q is finished at transceiver, generally be wherein one the tunnel to adopt the method for hardware to compensate to I/Q, when the quadrature two-way local oscillator phase difference of orthogonal mixer is not 90 °, to wherein one the tunnel increasing a phase shifter and compensate, make its two-way phase place reach quadrature; When I/Q two-way amplification filtering inconsistent, when causing amplitude imbalance, to big a road the decaying of amplitude wherein.The method shortcoming of this hardware compensating is: owing to increased hardware, thereby improved system complexity and cost; And hardware compensating self has been brought inconsistency again, and calibration result is difficult to reach degree of precision.
The unbalanced receiver software calibration of I/Q generally is to give receiver by signal generator output radiofrequency signal, receiver is sent to baseband processor with i/q signal, and it is uneven and calibrate according to I/Q disequilibrium survey value to measure the I/Q of receiver by the software algorithm of baseband processor.The unbalanced software calibration of I/Q is different from the hardware calibration part and is that it finishes through digital processing in baseband portion, implements flexiblely, and algorithm is fairly simple.Fig. 1 is the typical uneven calibration of the I/Q block diagram that adopts software approach to carry out.As shown in the figure, the radiofrequency signal that signal generator produces is given receiver, and receiver output I/Q gives baseband module, and (BB, Baseband), baseband module is handled the i/q signal that receives.The existing unbalanced software calibration method of receiver I/Q is a kind of method in common, needs signal source that received signal is provided, and need build dedicated platform for the unbalanced calibration of I/Q.As everyone knows, instrument such as signal generator are more valuable, and this production and improvement to system is a bigger cost expenditure; And set for this platform and test platform work normally be the thing of consumption manpower more consuming time, thereby the efficient that has reduced work and produced makes the software calibration method become complicated.
Summary of the invention
For addressing the above problem, the object of the invention provides receiver I/Q calibration steps in a kind of TDD system, and this method can reach measuring accuracy, simplifies I/Q disequilibrium survey method, breaks away from the dependence to instrument; Accordingly, the present invention also provides a kind of transmitter platform that can realize the I/Q self check.
For solving the problems of the technologies described above, the invention provides receiver I/Q calibration steps in a kind of TDD system, be specially: it is in running order to enable sender, and baseband module produces signal and sends to sender; It is in running order to enable receiver, the radio-frequency (RF) switch that presets transceiver is to transmitting terminal, described receiver directly receives sender and leaks into the receiver signal by described radio-frequency (RF) switch, and the i/q signal after described radiofrequency signal handled through described receiver sends to baseband module and carries out I/Q disequilibrium survey and imbalance compensation, and described radiofrequency signal is the standard signal of receiver calibration.
Described calibration comprises: measure receiver I/Q imbalance.Further, the present invention adopts the method for software according to receiver I/Q disequilibrium survey value receiver I/Q to be compensated.
The present invention also provides a kind of TDD transceiver system, comprising: sender, receiver, radio-frequency (RF) switch and baseband module, and wherein: sender is used to export radiofrequency signal; Radio-frequency (RF) switch places the sender output; When receiver is opened at sender, obtain the sender radiofrequency signal of leaking by described radio-frequency (RF) switch;
Baseband module is used to produce signal and sends to sender, and obtains the i/q signal after receiver is handled, and realizes receiver I/Q disequilibrium survey and compensation.
Above technical scheme as can be seen, the present invention is according to TDD system transmit-receive cofrequency characteristic, and the precision of the I/Q of sender own can satisfy the characteristics of the uneven performance requirement of I/Q of receiver fully, utilize transmitter leaakage to carry out IQ disequilibrium survey and calibration to the radiofrequency signal of receiver, the I/Q imbalance of receiver is calibrated on the uneven precision of sender, improved efficient, reduced demand instrument and meter.
And, the unbalanced calibration steps of receiver I/Q of the present invention is specially adapted to the production test platform, can the test item previous crops for independently one measure and calibrate, also can be placed on sender test and finish laggard row, in the past platform and test item without any influence.
And then, because the efficient of this method is high, thereby reduced the requirement that system docking is received machine integrated circuit (IC), for the cost that reduces receiver IC provides possibility.
The present invention also provides a kind of TDD transceiver system.Accordingly, this system can carry out the unbalanced calibration of I/Q under the situation that does not need the independent signal generator, can reach the unbalanced requirement of I/Q of receiver, and is simple and practical, reduced the demand of instrument and meter and the dependence of the uneven dedicated platform of IQ.
Description of drawings
Fig. 1 is the typical uneven calibration of the I/Q block diagram that adopts software approach to carry out;
Fig. 2 is the uneven calibration of I/Q of the present invention block diagram.
Embodiment
As stated in the Background Art, for sender, general digital circuit can not brought the I/Q imbalance, begin to quadrature up-conversion from DAC, the undesirable generation sender I/Q imbalance of the consistency of circuit and the orthogonality of frequency mixer, generally speaking, the design of sender hardware circuit makes and needn't carry out the requirement that the I/Q calibration can be satisfied technical indicator to sender.
The present invention is based on the characteristic of TDD system transmit-receive cofrequency, and sender is without calibration, the unbalanced precision of its I/Q can satisfy the unbalanced performance requirement of I/Q of receiver, the I/Q imbalance of utilizing the leakage power of sender to measure and calibrate receiver, make the unbalanced precision of I/Q of receiver reach the unbalanced degree of sender I/Q, the unbalanced calibration steps of receiver I/Q of the present invention, with the radiofrequency signal of sender standard signal as the receiver calibration, directly utilize to transmit and leak into the radiofrequency signal of receiver by radio-frequency (RF) switch, IQ imbalance to receiver is measured and is calibrated, and then, the I/Q imbalance of receiver is calibrated on the uneven precision of sender.This method has reduced the building of the demand of instrument and platform, and has greatly improved the operating efficiency of the uneven calibration of I/Q in the production test, is applicable to all TDD communication systems.
According to the characteristics of TDD (time division multiplexing) system, transceiver is operated in identical frequency, thereby receiver can receive the signal of local sender; And in time division multiplex system, reiving/transmitting state can not carry out at one time, and the switching of the reiving/transmitting state of TDD system realizes by radio-frequency (RF) switch.Be radio-frequency (RF) transceiver when being in emission state, radio-frequency (RF) switch places transmitting terminal; When corresponding radio-frequency (RF) transceiver was in accepting state, radio-frequency (RF) switch placed receiving terminal.In order to guarantee systematic function and power saving, during emission state, receiver is normally closed, i.e. the shutdown state.
With reference to Fig. 2 as can be known, radio-frequency (RF) switch Switch is three port devices, in theory, at emission state, when promptly 1 port and 3 ports link, the isolation of 1 port and 2 ports and 3 ports and 2 ports be isolated into infinity, but in fact, their isolation is limited, is generally 20dB, and good this isolation of radio-frequency (RF) switch of performance can reach 30dB.Therefore port one and 3 leak into port 2 signal only than the little 20dB that transmits to 30dB, concerning receiver, be bigger signal, the present invention has promptly utilized the signal that leaks into port 2 with as sensed signal sources.Dotted line is depicted as the mode of sender signal leakage to receiver among the figure.
With reference to Fig. 2, receiver I/Q calibration steps is specially in the TDD of the present invention system: first step I/Q disequilibrium survey, preset radio-frequency (RF) switch and place transmitting terminal, promptly enable transceiver and be in emission state, enable sender and carry out work, obtain the signal of baseband module, it is in running order to enable receiver, and then the radiofrequency signal of sender can directly leak into the input of receiver by radio-frequency (RF) switch, receiver is opened, and further the sender signal that obtains is sent to baseband module and carries out the uneven processing of I/Q.The unbalanced calibration process of I/Q that described baseband module carried out mainly comprises by the disposable I/Q imbalance of measuring this receiver of software algorithm; Backoff algorithm is according to the I/Q disequilibrium survey value of this receiver, and the I/Q during to later reception operating state compensates.
The uneven software calibration method of described I/Q realizes through two steps usually, first step I/Q disequilibrium survey: general measure platform and workbench are different, need general or special signal generator to output signal to receiver, receiver is given base band (BB) with baseband I/Q signal, the i/q signal that base band BB sends here receiver carries out the ADC sampling, convert Simulation with I/Q signal to digital i/q signal, BB is according to Measurement Algorithm then, gather the digital i/q signal of the some that needs, it is carried out algorithm process, calculate the unbalanced measured value of I/Q, and measured value is stored among the BB; The second step I/Q imbalance compensation: on the system works platform, digital i/q signal after BB samples to ADC adds I/Q imbalance compensation algorithm software, afterwards in the work of system, BB can compensate a wherein way word signal of I/Q two-way, and then the I/Q two-way after will compensating carries out necessary Base-Band Processing, thereby reaches the purpose of calibration.Above provide software to carry out the preferable implementation method of the uneven calibration of I/Q, those skilled in the art also can choose from techniques well known, and the present invention also limits for unbalanced concrete measurement of I/Q and compensation method baseband module unintentionally.
The unbalanced calibration steps of receiver I/Q provided by the present invention is particularly useful for the production test platform, can the test item previous crops for independently one measure and calibrate, also can be placed on sender test and finish laggard row, in the past platform and test item without any influence.
The present invention also provides a kind of TDD transceiver system, can realize the unbalanced self calibration of I/Q.Comprise: sender, receiver, radio-frequency (RF) switch, baseband module.Described sender is used to obtain the signal of baseband module generation and modulate output; Radio-frequency (RF) switch places the sender output; When described receiver was in running order, if sender is opened, then receiver obtained the sender signal that leaks by described radio-frequency (RF) switch; And the i/q signal after receiver handled sends to baseband module and carries out unbalanced measurement of I/Q and storage; Described baseband module is used to produce i/q signal and sends to sender; Obtain the i/q signal of receiver, and the I/Q imbalance is measured by Measurement Algorithm, and store measured value.During the system operate as normal, receiver is according to I/Q disequilibrium survey value and backoff algorithm, compensates accepting the I/Q that link is in operate as normal, thereby realizes the unbalanced calibration of receiver I/Q.
More than receiver I/Q calibration steps and transceiver system in a kind of TDD provided by the present invention system are described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (4)
1. receiver I/Q calibration steps in the TDD system is characterized in that:
It is in running order to enable sender, and baseband module produces signal and sends to sender;
It is in running order to enable receiver, the radio-frequency (RF) switch that presets transceiver is to transmitting terminal, described receiver directly receives sender leaks into receiver by described radio-frequency (RF) switch radiofrequency signal, and the i/q signal after described radiofrequency signal handled through described receiver sends to baseband module and carries out I/Q disequilibrium survey and imbalance compensation, and described radiofrequency signal is the standard signal of receiver calibration.
2. receiver I/Q calibration steps in the TDD as claimed in claim 1 system is characterized in that described calibration comprises:
Measure receiver I/Q imbalance, and receiver I/Q is compensated.
3. receiver I/Q calibration steps in the TDD as claimed in claim 1 system is characterized in that:
Adopt the method for software receiver I/Q to be compensated according to receiver I/Q disequilibrium survey value.
4. TDD transceiver system, comprising: sender, receiver, radio-frequency (RF) switch and baseband module is characterized in that:
Sender is used to export radiofrequency signal;
Radio-frequency (RF) switch places the sender output; When receiver is opened at sender, obtain the sender radiofrequency signal of leaking by described radio-frequency (RF) switch;
Baseband module is used to produce signal and sends to sender, and obtains the i/q signal after receiver is handled, and realizes receiver I/Q disequilibrium survey and compensation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2005101346277A CN1984101B (en) | 2005-12-13 | 2005-12-13 | Method for aligning receiver I/Q in TDD system and receiver-transmitter platform |
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| CN2005101346277A CN1984101B (en) | 2005-12-13 | 2005-12-13 | Method for aligning receiver I/Q in TDD system and receiver-transmitter platform |
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| CN1984101A CN1984101A (en) | 2007-06-20 |
| CN1984101B true CN1984101B (en) | 2010-04-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110868264A (en) * | 2018-08-28 | 2020-03-06 | 北京展讯高科通信技术有限公司 | Time division duplex transceiver, calibration method thereof and readable storage medium |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101238877B1 (en) | 2009-06-30 | 2013-03-05 | (주)에프씨아이 | Estimation and Compensation Method for IQ Imbalance |
| CN103731382B (en) * | 2012-10-12 | 2017-06-30 | 北京信威通信技术股份有限公司 | A kind of unbalanced bearing calibrations of terminal IQ |
| WO2017132949A1 (en) * | 2016-02-04 | 2017-08-10 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and tdd radio transceiver for correcting receiving iq impairment |
| CN108259404B (en) | 2018-01-12 | 2020-01-17 | 深圳锐越微技术有限公司 | IQ two-path imbalance generation-based signal calibration method, device and equipment |
| US11190285B1 (en) * | 2020-11-09 | 2021-11-30 | Hangzhou Geo-Chip Technology Co., Ltd. | Transmitter, receiver, signal transceiver and methods therefor |
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| CN1131848A (en) * | 1994-11-30 | 1996-09-25 | 索尼公司 | Transmitting-receiving apparatus |
| CN1350370A (en) * | 2000-10-24 | 2002-05-22 | 深圳市中兴通讯股份有限公司 | Transceiver |
| CN1381090A (en) * | 2000-03-21 | 2002-11-20 | 皇家菲利浦电子有限公司 | Autocalibration of transceiver through nulling of DC-voltage in a receiver and injecting of DC signals in a transmitter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1131848A (en) * | 1994-11-30 | 1996-09-25 | 索尼公司 | Transmitting-receiving apparatus |
| CN1381090A (en) * | 2000-03-21 | 2002-11-20 | 皇家菲利浦电子有限公司 | Autocalibration of transceiver through nulling of DC-voltage in a receiver and injecting of DC signals in a transmitter |
| CN1350370A (en) * | 2000-10-24 | 2002-05-22 | 深圳市中兴通讯股份有限公司 | Transceiver |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110868264A (en) * | 2018-08-28 | 2020-03-06 | 北京展讯高科通信技术有限公司 | Time division duplex transceiver, calibration method thereof and readable storage medium |
| CN110868264B (en) * | 2018-08-28 | 2021-12-10 | 北京紫光展锐通信技术有限公司 | Time division duplex transceiver, calibration method thereof and readable storage medium |
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| CN1984101A (en) | 2007-06-20 |
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