CN106603108B - Transceiver and working method - Google Patents
Transceiver and working method Download PDFInfo
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- CN106603108B CN106603108B CN201510665005.0A CN201510665005A CN106603108B CN 106603108 B CN106603108 B CN 106603108B CN 201510665005 A CN201510665005 A CN 201510665005A CN 106603108 B CN106603108 B CN 106603108B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/30—Circuits for homodyne or synchrodyne receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
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Abstract
The invention provides a transceiver and a working method, wherein the transceiver comprises a zero intermediate frequency transmitting channel and a zero intermediate frequency receiving channel, and the transceiver comprises: the feedback control link is used for acquiring a transmitting signal of the zero intermediate frequency transmitting path, generating a feedback signal according to the transmitting signal and calibrating the zero intermediate frequency transmitting path according to the feedback signal; and the calibrating device is used for carrying out online calibration on the zero intermediate frequency transmitting path, the zero intermediate frequency receiving path and the feedback control link. Through the implementation of the invention, the transceiver acquires the transmitting signal of the transmitting path through the feedback control link, the transmitting path is calibrated reversely according to the transmitting signal, and the calibrating device also realizes the on-line calibration of all paths in the transceiver, so that the transceiver can be calibrated in real time according to the equipment running condition, the working performance of the zero intermediate frequency transceiver is improved, and the problem of poor working performance caused by the off-line calibration of the existing zero intermediate frequency transceiver is solved.
Description
Technical Field
The present invention relates to the field of transceivers of communication systems, and in particular, to a transceiver and a working method thereof.
Background
In the field of communication in recent years, zero intermediate frequency technology is more and more widely applied and gradually matured due to the development of devices; the transceiver adopting the zero intermediate frequency technology has the greatest advantages that an intermediate frequency filter circuit, an intermediate frequency mixer and an intermediate frequency local oscillator are omitted, the channel is simplified, the cost of the channel is reduced, and the volume of a single board is reduced, so that the advantages cater to the requirements of miniaturization and low cost of the current transceiver, especially a communication base station; therefore, transceivers of zero intermediate frequency technology are receiving wide attention and use.
However, both the carrier and the image frequency of a zero intermediate frequency transceiver fall within the signal band, which affects the transceiver performance. The high-if scheme can shift these components out of the useful signal band by frequency planning, and meet system applications by simple off-line calibration and filtering. However, the greatest disadvantage of the offline calibration scheme is that the calibration parameters cannot adapt to temperature changes, calibration performance will be greatly deteriorated along with temperature changes of calibration values written into the offline table at normal temperature, and for a zero intermediate frequency architecture, due to carrier leakage and sideband suppression, all of these spurious components fall into a useful signal band, and the working performance is poor due to offline calibration.
Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a zero-if transceiver capable of providing operation performance.
Disclosure of Invention
The invention provides a transceiver and a working method, which aim to solve the problem of poor working performance caused by off-line calibration of the existing zero intermediate frequency transceiver.
The invention provides a transceiver, which comprises a zero intermediate frequency transmitting channel and a zero intermediate frequency receiving channel, and: the feedback control link is used for acquiring a transmitting signal of the zero intermediate frequency transmitting path, generating a feedback signal according to the transmitting signal and calibrating the zero intermediate frequency transmitting path according to the feedback signal; and the calibrating device is used for carrying out online calibration on the zero intermediate frequency transmitting path, the zero intermediate frequency receiving path and the feedback control link.
Further, the feedback control link is configured to determine a transmission power of the zero intermediate frequency transmission path according to the transmission signal, generate a feedback signal according to the transmission power, and assist in calibrating the zero intermediate frequency transmission path according to the feedback signal.
Further, the transceiver includes a plurality of zero if transmission paths, and the feedback control link is configured to calibrate each of the zero if transmission paths by time division multiplexing.
Furthermore, the calibration device is also used for performing off-line calibration on the zero intermediate frequency transmitting path, the zero intermediate frequency receiving path and the feedback control link.
Further, the calibration device is specifically used for closing the power amplifier device of the zero intermediate frequency transmission path during initialization; utilizing an internal calibration source of a zero intermediate frequency transmission channel to carry out off-line calibration on the leakage of a transmission local oscillator of the zero intermediate frequency transmission channel; constructing and utilizing a filter coefficient on a zero intermediate frequency transmitting path, simulating the unbalance of the amplitude and the phase of a transmitting shunt path, and performing transmitting mirror frequency off-line calibration on the zero intermediate frequency transmitting path; feedback off-line calibration is carried out on the feedback control link by utilizing an internal calibration source of the feedback control link; the component simulates the unbalance of the amplitude and the phase of a feedback shunt by using the filter coefficient on the feedback control link, and performs feedback image frequency off-line calibration on the feedback control link; utilizing an internal calibration source of a zero intermediate frequency receiving channel to carry out receiving off-line calibration on the zero intermediate frequency receiving channel; and constructing and utilizing a filter coefficient on a zero intermediate frequency receiving channel to simulate the amplitude and phase imbalance of the receiving branch circuit, and carrying out off-line receiving mirror frequency calibration on the zero intermediate frequency receiving channel.
Furthermore, the calibration device is used for starting a power amplifier device of the zero intermediate frequency transmission channel when the calibration device works normally; controlling a feedback control link to obtain a transmitting signal of a zero intermediate frequency transmitting channel, and performing digital predistortion detection, standing wave detection and power detection according to the transmitting signal; carrying out receiving image frequency on-line calibration on a zero intermediate frequency receiving channel by using service data; and after the preset time, controlling the feedback control link to stop acquiring a transmitting signal of the zero intermediate frequency transmitting path, performing transmitting local oscillator leakage on-line calibration and transmitting image frequency on-line calibration on the zero intermediate frequency transmitting path by using the service data, and performing feedback image frequency on-line calibration on the feedback control link by using the service data.
Further, the preset time includes a control calibration switching period or a transceiving switching time slot.
The invention provides a working method of a transceiver, wherein the transceiver comprises a zero intermediate frequency transmitting path, a zero intermediate frequency receiving path, a feedback control link and a calibration device, and the working method comprises the following steps: the feedback control link acquires a transmitting signal of the zero intermediate frequency transmitting path, generates a feedback signal according to the transmitting signal, and calibrates the zero intermediate frequency transmitting path according to the feedback signal; the calibration device carries out on-line calibration on the zero intermediate frequency transmitting path, the zero intermediate frequency receiving path and the feedback control link.
Further, the feedback control link acquires a transmission signal of the zero intermediate frequency transmission path, and calibrating the zero intermediate frequency transmission path according to the transmission signal includes: the feedback control link determines the transmitting power of the zero intermediate frequency transmitting path according to the transmitting signal, generates a feedback signal according to the transmitting power, and assists in calibrating the zero intermediate frequency transmitting path according to the feedback signal.
Further, the method also comprises the following steps: the transceiver comprises a plurality of zero intermediate frequency transmitting paths, and the feedback control link calibrates each zero intermediate frequency transmitting path in a time division multiplexing mode.
Further, the method also comprises the following steps: the calibration device performs off-line calibration on the zero intermediate frequency transmitting path, the zero intermediate frequency receiving path and the feedback control link.
Further, the off-line calibration of the zero intermediate frequency transmitting path, the zero intermediate frequency receiving path and the feedback control link by the calibration device comprises: when initializing, closing the power amplifier of the zero intermediate frequency transmitting path; utilizing an internal calibration source of a zero intermediate frequency transmission channel to carry out off-line calibration on the leakage of a transmission local oscillator of the zero intermediate frequency transmission channel; constructing and utilizing a filter coefficient on a zero intermediate frequency transmitting path, simulating the unbalance of the amplitude and the phase of a transmitting shunt path, and performing transmitting mirror frequency off-line calibration on the zero intermediate frequency transmitting path; feedback off-line calibration is carried out on the feedback control link by utilizing an internal calibration source of the feedback control link; the component simulates the unbalance of the amplitude and the phase of a feedback shunt by using the filter coefficient on the feedback control link, and performs feedback image frequency off-line calibration on the feedback control link; utilizing an internal calibration source of a zero intermediate frequency receiving channel to carry out receiving off-line calibration on the zero intermediate frequency receiving channel; and constructing and utilizing a filter coefficient on a zero intermediate frequency receiving channel to simulate the amplitude and phase imbalance of the receiving branch circuit, and carrying out off-line receiving mirror frequency calibration on the zero intermediate frequency receiving channel.
Further, the calibration device for performing on-line calibration on the zero intermediate frequency transmitting path, the zero intermediate frequency receiving path and the feedback control link includes: when the zero intermediate frequency transmission device works normally, the power amplification device of the zero intermediate frequency transmission path is started; controlling a feedback control link to obtain a transmitting signal of a zero intermediate frequency transmitting channel, and performing digital predistortion detection, standing wave detection and power detection according to the transmitting signal; carrying out receiving image frequency on-line calibration on a zero intermediate frequency receiving channel by using service data; and after the preset time, controlling the feedback control link to stop acquiring a transmitting signal of the zero intermediate frequency transmitting path, performing transmitting local oscillator leakage on-line calibration and transmitting image frequency on-line calibration on the zero intermediate frequency transmitting path by using the service data, and performing feedback image frequency on-line calibration on the feedback control link by using the service data.
Further, the preset time includes a control calibration switching period or a transceiving switching time slot.
The invention has the beneficial effects that:
the invention provides a transceiver, which comprises a feedback control link and a calibration device, wherein the feedback control link acquires a transmitting signal of a transmitting path, and reversely calibrates the transmitting path according to the transmitting signal, and meanwhile, the calibration device also realizes the online calibration of all paths in the transceiver, so that the transceiver can be calibrated in real time according to the running condition of equipment, the working performance is improved, and the problem of poor working performance caused by the off-line calibration of the existing zero intermediate frequency transceiver is solved.
Drawings
Fig. 1 is a schematic structural diagram of a transceiver according to a first embodiment of the present invention;
fig. 2 is a flowchart of a transceiver operation method according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a transceiver according to a third embodiment of the present invention;
fig. 4 is a flow chart of the overall calibration of a transceiver in a third embodiment of the present invention;
FIG. 5 is a flow chart of the calibration of the receive path according to the third embodiment of the present invention;
FIG. 6 is a flow chart of transmit path calibration in a third embodiment of the present invention;
fig. 7 is a schematic structural diagram of a transceiver according to a fourth embodiment of the present invention.
Detailed Description
The invention will now be further explained by means of embodiments in conjunction with the accompanying drawings.
The first embodiment:
fig. 1 is a schematic structural diagram of a transceiver according to a first embodiment of the present invention, and as can be seen from fig. 1, in this embodiment, the transceiver 1 according to the present invention includes: a zero intermediate frequency transmit path 11 and a zero intermediate frequency receive path 12, and:
the feedback control link 13 is used for acquiring a transmitting signal of the zero intermediate frequency transmitting path 11, generating a feedback signal according to the transmitting signal, and calibrating the zero intermediate frequency transmitting path according to the feedback signal;
and the calibrating device 14 is used for performing online calibration on the zero intermediate frequency transmitting path, the zero intermediate frequency receiving path and the feedback control link so as to realize real-time calibration of the transceiver.
In some embodiments, the manner of calibrating the zero intermediate frequency transmission path by the feedback control link 13 according to the feedback signal in the above embodiments includes direct control calibration and auxiliary calibration, the direct control calibration of the output of the DAC module and/or the low-pass filter module in the zero intermediate frequency transmission path 11 may be implemented by setting a separate control module (for example, setting a CPU, etc.), or the direct control calibration of the output of the DAC module and/or the low-pass filter module in the zero intermediate frequency transmission path 11 may be implemented by comparing the transmission power in the feedback signal with the transmission power that is to be achieved, outputting a comparison result, and then sending the comparison result to the DAC module and/or the low-pass filter module in the zero intermediate frequency transmission path 11, where the DAC module and/or the low-pass filter module adjusts the output power according to the comparison result, so.
In some embodiments, the feedback control link 13 in the above embodiments is configured to determine a transmission power of the zero intermediate frequency transmission path according to the transmission signal, generate a feedback signal according to the transmission power, and assist in calibrating the zero intermediate frequency transmission path according to the feedback signal.
In some embodiments, the transceiver 1 in the above-described embodiments comprises a plurality of zero if transmit paths 12, and the feedback control link 13 is configured to calibrate each zero if transmit path 12 by time-division multiplexing.
In some embodiments, the calibration device 14 in the above embodiments is further configured to perform offline calibration on the zero intermediate frequency transmit path, the zero intermediate frequency receive path, and the feedback control link.
In some embodiments, the calibration device 14 in the above embodiments is specifically configured to:
when initializing, closing the power amplifier of the zero intermediate frequency transmitting path;
utilizing an internal calibration source of a zero intermediate frequency transmission channel to carry out off-line calibration on the leakage of a transmission local oscillator of the zero intermediate frequency transmission channel;
constructing and utilizing a filter coefficient on a zero intermediate frequency transmitting path, simulating the unbalance of the amplitude and the phase of a transmitting shunt path, and performing transmitting mirror frequency off-line calibration on the zero intermediate frequency transmitting path;
feedback off-line calibration is carried out on the feedback control link by utilizing an internal calibration source of the feedback control link;
the component simulates the unbalance of the amplitude and the phase of a feedback shunt by using the filter coefficient on the feedback control link, and performs feedback image frequency off-line calibration on the feedback control link;
utilizing an internal calibration source of a zero intermediate frequency receiving channel to carry out receiving off-line calibration on the zero intermediate frequency receiving channel;
and constructing and utilizing a filter coefficient on a zero intermediate frequency receiving channel to simulate the amplitude and phase imbalance of the receiving branch circuit, and carrying out off-line receiving mirror frequency calibration on the zero intermediate frequency receiving channel.
In some embodiments, the calibration device 14 in the above embodiments is specifically configured to:
when the zero intermediate frequency transmission device works normally, the power amplification device of the zero intermediate frequency transmission path is started;
controlling a feedback control link to obtain a transmitting signal of a zero intermediate frequency transmitting channel, and performing digital predistortion detection, standing wave detection and power detection according to the transmitting signal;
carrying out receiving image frequency on-line calibration on a zero intermediate frequency receiving channel by using service data;
and after the preset time, controlling the feedback control link to stop acquiring a transmitting signal of the zero intermediate frequency transmitting path, performing transmitting local oscillator leakage on-line calibration and transmitting image frequency on-line calibration on the zero intermediate frequency transmitting path by using the service data, and performing feedback image frequency on-line calibration on the feedback control link by using the service data.
In some embodiments, the preset Time in the above embodiments includes a control calibration switching period or a transceiving switching Time slot, and is mainly for a TDD (Time Division duplex) system.
The off-line calibration related by the invention refers to calibration which is carried out before normal work when equipment is initialized, and is mainly used for correcting errors existing in the equipment; correspondingly, the online calibration criterion refers to calibration performed when the equipment normally works, and is mainly used for correcting errors of the equipment caused by environmental factors such as temperature, power and the like.
Second embodiment:
fig. 2 is a flowchart of an operating method of a transceiver according to a second embodiment of the present invention, and as can be seen from fig. 2, in this embodiment, the operating method of the transceiver according to the present invention includes the following steps:
s201: the feedback control link acquires a transmitting signal of the zero intermediate frequency transmitting path, generates a feedback signal according to the transmitting signal, and calibrates the zero intermediate frequency transmitting path according to the feedback signal;
s202: the calibration device carries out on-line calibration on the zero intermediate frequency transmitting path, the zero intermediate frequency receiving path and the feedback control link.
In some embodiments, the obtaining, by the feedback control link in the foregoing embodiments, the transmission signal of the zero intermediate frequency transmission path, and calibrating the zero intermediate frequency transmission path according to the transmission signal includes: the feedback control link determines the transmitting power of the zero intermediate frequency transmitting path according to the transmitting signal, generates a feedback signal according to the transmitting power, and assists in calibrating the zero intermediate frequency transmitting path according to the feedback signal.
In some embodiments, the transceiver in the above embodiments includes a plurality of zero if transmission paths, and the operation method further includes: the feedback control link calibrates each zero intermediate frequency transmission path in a time division multiplexing mode.
In some embodiments, the operating method in the above embodiments further includes: the calibration device performs off-line calibration on the zero intermediate frequency transmitting path, the zero intermediate frequency receiving path and the feedback control link.
In some embodiments, the performing, by the calibration apparatus in the foregoing embodiments, the offline calibration on the zero intermediate frequency transmission path, the zero intermediate frequency reception path, and the feedback control link includes:
when initializing, closing the power amplifier of the zero intermediate frequency transmitting path;
utilizing an internal calibration source of a zero intermediate frequency transmission channel to carry out off-line calibration on the leakage of a transmission local oscillator of the zero intermediate frequency transmission channel;
constructing and utilizing a filter coefficient on a zero intermediate frequency transmitting path, simulating the unbalance of the amplitude and the phase of a transmitting shunt path, and performing transmitting mirror frequency off-line calibration on the zero intermediate frequency transmitting path;
feedback off-line calibration is carried out on the feedback control link by utilizing an internal calibration source of the feedback control link;
the component simulates the unbalance of the amplitude and the phase of a feedback shunt by using the filter coefficient on the feedback control link, and performs feedback image frequency off-line calibration on the feedback control link;
utilizing an internal calibration source of a zero intermediate frequency receiving channel to carry out receiving off-line calibration on the zero intermediate frequency receiving channel;
and constructing and utilizing a filter coefficient on a zero intermediate frequency receiving channel to simulate the amplitude and phase imbalance of the receiving branch circuit, and carrying out off-line receiving mirror frequency calibration on the zero intermediate frequency receiving channel.
In some embodiments, the on-line calibration of the zero intermediate frequency transmission path, the zero intermediate frequency reception path, and the feedback control link by the calibration apparatus in the above embodiments includes:
when the zero intermediate frequency transmission device works normally, the power amplification device of the zero intermediate frequency transmission path is started;
controlling a feedback control link to obtain a transmitting signal of a zero intermediate frequency transmitting channel, and performing digital predistortion detection, standing wave detection and power detection according to the transmitting signal;
carrying out receiving image frequency on-line calibration on a zero intermediate frequency receiving channel by using service data;
and after the preset time, controlling the feedback control link to stop acquiring a transmitting signal of the zero intermediate frequency transmitting path, performing transmitting local oscillator leakage on-line calibration and transmitting image frequency on-line calibration on the zero intermediate frequency transmitting path by using the service data, and performing feedback image frequency on-line calibration on the feedback control link by using the service data.
In some embodiments, the preset time in the above embodiments includes a control calibration switching period or a transceiving switching time slot.
The present invention will now be further explained with reference to specific application scenarios.
The third embodiment:
the embodiment provides a transceiver with single receiving and single transmitting, as shown in fig. 3:
the hardware structure of the transceiver RRU (Remote Radio Unit) includes an antenna 31 and a Filter module 32 which are common to a receiving channel and a transmitting channel, a Low noise amplification module 331, a controllable gain amplifier module 341, a demodulation module 351, a Low Pass Filter (LPF) Low Pass Filter module 361 and an ADC (Analog to Digital converter) Analog-to-Digital conversion module 371 which belong to the receiving channel, a power amplifier module 332, a controllable gain amplifier module 342, a modulation module 352, an LPF Low Pass Filter module 362 and a DAC (Digital to Analog converter) Digital to Analog conversion module 372 which belong to the transmitting channel, a selection switch 333 with a coupling function which belongs to a feedback control link, a controllable gain amplifier module 343, a demodulation module 353, a Low Pass Filter module 363 and an ADC Analog-to-Digital conversion module 373, and a Digital signal processing module 38 which is mainly used for service implementation, the system also comprises a phase-locked loop module and a local oscillator module which are not shown; the controllable gain amplifier modules 341, 342, and 343 may be implemented by a controllable gain amplifier, the demodulation module 351, the modulation module 352, and the demodulation module 353 may also be implemented by a modem, the LPF low-pass filter modules 361, 362, and 363 may be implemented by an LPF low-pass filter, and the ADC analog-to-digital conversion module 371, the DAC digital-to-analog conversion module 372, and the ADC analog-to-digital conversion module 373 may also be implemented by an AD/DA converter. In the present embodiment, the function of the calibration apparatus is implemented by software, and therefore, the present embodiment does not show the corresponding module.
Specifically, the schematic diagram of the zero intermediate frequency single channel transceiver system comprises three parts of transmitting, receiving and feedback, a transmitting link is subjected to digital-to-analog conversion by a DAC, is provided to a modulation module through low-pass filtering to complete up-conversion, is subjected to controllable gain amplification module to adjust transmitting power, and is subjected to signal amplification through a power amplifier to complete filtering to an antenna port for transmitting; after receiving an antenna port signal, a receiving link performs gain control through a low-noise amplification and controllable gain amplification module, then sends the signal to a demodulator for down-conversion, and then sends the signal to an ADC for analog-to-digital conversion after filtering through a low-pass filter; the feedback link internally comprises a controllable gain amplifier module and a demodulation and low-pass filtering module, the filtered signals are provided for an ADC (analog-to-digital converter) to be subjected to analog-to-digital conversion and then to be processed in the next step, the feedback link has the functions of power detection, standing wave detection and real-time calibration, and the channel switching module is adopted to switch among a plurality of transmitting channels.
The function of each module of the transceiver provided by the invention is explained, compared with the traditional high-intermediate frequency zero-intermediate frequency architecture, the transceiver does not need a radio frequency filtering module, an intermediate frequency amplifying module and an intermediate frequency filtering module. The filtering module is used for receiving and transmitting filtering in a frequency band, finishing the inhibition of useless signals and improving the performance of the transceiver. The low-noise amplification module performs low-noise amplification on the received small signal. The controllable gain amplification module completes the gain adjustment function of the receiver and the transmitter. The modulation and demodulation module performs up-conversion on the transmitter by adopting a modulator, and performs down-conversion on the receiver and the feedback by adopting a demodulator. The phase-locked loop module is used to provide local oscillator signals to the modulator and demodulator. The local oscillation module provides local oscillation signals to the modulation and demodulation module. The low-pass filtering module filters the intermediate-frequency signals before modulation and after demodulation. The AD/DA module completes the conversion from analog to digital and from digital to analog. The power amplification module amplifies the transmitted small signal to rated output power. The coupling module in the selection switch completes signal coupling, the energy of the coupled transmitting signal is provided for a feedback link to carry out power detection, the transmitting power control and the predistortion data acquisition function are realized, and the selection module completes the multichannel forward and reverse signal selection function. The digital signal processing module completes digital signal operation and digital processing functions.
Another key point of the above description of the hardware architecture of the zero-if transceiver system provided in this embodiment is the implementation of the auto-calibration function of the zero-if transceiver and the solution of the matching with the RRU system function.
The automatic calibration function includes calibration of a transmit local oscillator and an image frequency and calibration of a receive/feedback direct current offset and an image frequency, and can be specifically divided into off-line calibration of transmit local oscillator leakage, off-line calibration of transmit image frequency, off-line calibration of receive and feedback image frequency, off-line calibration of transmit local oscillator leakage, and on-line calibration of transmit image frequency and receive and feedback image frequency.
The off-line calibration is completed by adopting a calibration source inside a transceiver module to generate a single tone, sweep frequency or modulation signals, and the on-line calibration is completed by adopting service signals of a transceiver while ensuring that normal transceiver service is not influenced.
As shown in fig. 4, the overall calibration flowchart of the RRU system is not repeated, and detailed procedures of the receiving and transmitting calibration will now be described separately.
The receiving calibration function can complete off-line calibration and enable on-line calibration when the RRU is initialized because the receiving calibration function is not multiplexed with other channels, as shown in fig. 5, a receiving calibration process is not repeated, wherein the calibration of the mirror frequency of a receiving link is realized by constructing a filter coefficient on a receiving IQ shunt to simulate the amplitude and phase imbalance of the IQ shunt.
For the transmission calibration, a feedback control link is occupied in the real-time calibration process, so that the functions of the real-time calibration and a digital predistortion algorithm, power detection and standing wave detection of a transmitter are mutually exclusive, and software control is needed to be performed on a power-on process and a real-time calibration process of a transceiver.
Based on this, as shown in fig. 6, the transmission calibration procedure includes: firstly, enabling a power transmission channel on the RRU, firstly, performing offline calibration by adopting an internal calibration source, closing the power amplifier before the calibration is started for protecting the power amplifier, then sequentially performing offline calibration on a feedback channel and the transmission channel, and simulating the amplitude and phase imbalance of an IQ shunt of a transmission link by constructing an LPF filter coefficient on the transmission link to realize the calibration of a transmission sideband. After the off-line calibration is completed, the internal calibration source is closed, the transmitter normally transmits service data and simultaneously performs DPD (Digital Pre Distortion) detection, standing wave detection and power detection functions, meanwhile, the timing is started, the DPD, standing wave detection and power detection functions are stopped after a specified time period is reached, the on-line calibration function of the transmission and feedback link is started by using the service data, and the functions of DPD, standing wave detection and power detection are recovered after the calibration is completed. For a TDD system, the receiving and transmitting switching time slot needs to be judged, receiving online calibration is carried out when receiving work is enabled, and transmitting online calibration is carried out when transmitting work is enabled. In order to ensure the robustness of the calibration procedure, some error flags and countermeasures may be set.
The fourth embodiment:
the present embodiment provides a transceiver with dual reception and dual transmission (2T2R), as shown in fig. 7:
the 2T2R transceiver provided in this embodiment is a transceiver that duplicates the receive path and the transmit path of the single-receive single-transmit receiver shown in fig. 3, and shares a feedback control link by time division multiplexing. Wherein the controllable gain amplification module can be realized by adopting an attenuator and amplifier integrated scheme.
The power-on RRU starting and calibrating process comprises the following steps: after the power is on, single board software and hardware are initialized, the version of a chip is loaded after an optical interface is self-adaptive, the initialization configuration of the chip is carried out under the state that a power amplifier is closed, the downlink image frequency and sideband OFF-line calibration is completed, at the moment, a power amplifier output coupling loop is required to be disconnected, so that an electronic switch is turned to an ALL OFF state, the uplink OFF-line calibration is triggered, the RRU carries out power calibration and other processes after the OFF-line calibration is completed, the iteration number of each calibration is set in the calibration process, and a success value is returned after the calibration. If an error occurs in the calibration process, reporting an error code chip to reset and recalibrate, and continuously operating the error reporting fault for five times to stop working.
The on-line calibration process comprises the following steps: setting a calibration period, wherein in the on-line calibration, the control state of the electronic switch is switched from FPGA (Field-Programmable Gate Array) to CPU manual control, and is fixed as a service signal corresponding to the emission channel, and when the FPGA switches the electronic switch to the manual state, the FPGA requires the switching point to be positioned in the interval time of two complete electronic switch switching periods, namely, the integrity of the electronic switch period is ensured. When calibration is started, the RRU needs to stop DPD and standing wave detection, stop power detection, switch the electronic switch to a corresponding service signal channel, and after calibration is completed, the CPU enables the electronic switch to be in an FPGA automatic state, enables power detection, and enables DPD and standing wave detection functions. If error information occurs in the calibration process, the error information needs to be judged, information which does not affect the performance and the use is shielded, the error information which has damage to the performance and does not affect the function is given an alarm, and the unavailable information is given an alarm notice or even written into a log.
In summary, the implementation of the present invention has at least the following advantages:
the invention provides a transceiver, which comprises a feedback control link and a calibration device, wherein the feedback control link acquires a transmitting signal of a transmitting path, and reversely calibrates the transmitting path according to the transmitting signal, and meanwhile, the calibration device also realizes the online calibration of all paths in the transceiver, so that the transceiver can be calibrated in real time according to the running condition of equipment, the working performance is improved, and the problem of poor working performance caused by the off-line calibration of the existing zero intermediate frequency transceiver is solved.
The above embodiments are only examples of the present invention, and are not intended to limit the present invention in any way, and any simple modification, equivalent change, combination or modification made by the technical essence of the present invention to the above embodiments still fall within the protection scope of the technical solution of the present invention.
Claims (12)
1. A transceiver, comprising a zero-if transmit path and a zero-if receive path, and:
the feedback control link is used for acquiring a transmitting signal of the zero intermediate frequency transmitting path, generating a feedback signal according to the transmitting signal and calibrating the zero intermediate frequency transmitting path according to the feedback signal;
the calibration device is used for carrying out online calibration on the zero intermediate frequency transmitting path, the zero intermediate frequency receiving path and the feedback control link;
when the calibration device works normally, the power amplifier device of the zero intermediate frequency transmitting channel is started; controlling the feedback control link to obtain a transmitting signal of the zero intermediate frequency transmitting channel, and performing digital predistortion detection, standing wave detection and power detection according to the transmitting signal; carrying out receiving image frequency on-line calibration on the zero intermediate frequency receiving channel by using service data; and after the preset time, controlling the feedback control link to stop acquiring the transmitting signal of the zero intermediate frequency transmitting channel, performing transmitting local oscillator leakage on-line calibration and transmitting image frequency on-line calibration on the zero intermediate frequency transmitting channel by using the service data, and performing feedback image frequency on-line calibration on the feedback control link by using the service data.
2. The transceiver of claim 1, wherein the feedback control link is configured to determine a transmit power of the zero intermediate frequency transmit path based on the transmit signal, to generate a feedback signal based on the transmit power, and to assist in calibrating the zero intermediate frequency transmit path based on the feedback signal.
3. The transceiver of claim 1, wherein the transceiver comprises a plurality of zero if transmit paths, and wherein the feedback control link is configured to calibrate each zero if transmit path by time division multiplexing.
4. A transceiver according to any one of claims 1 to 3, wherein the calibration means is further configured to perform off-line calibration on the zero-if transmit path, the zero-if receive path and the feedback control link, the off-line calibration being performed before normal operation of the apparatus at initialization.
5. The transceiver of claim 4, wherein the calibration means is specifically configured to turn off the power amplifier means of the zero intermediate frequency transmission path at initialization; utilizing an internal calibration source of the zero intermediate frequency transmission channel to perform transmission local oscillator leakage off-line calibration on the zero intermediate frequency transmission channel; constructing and utilizing a filter coefficient on the zero intermediate frequency transmitting path, simulating the amplitude and phase imbalance of the transmitting branch path, and performing transmitting mirror frequency off-line calibration on the zero intermediate frequency transmitting path; feedback off-line calibration is carried out on the feedback control link by utilizing an internal calibration source of the feedback control link; constructing and utilizing a filter coefficient on the feedback control link, simulating the amplitude and phase imbalance of a feedback shunt circuit, and performing feedback image frequency off-line calibration on the feedback control link; utilizing an internal calibration source of the zero intermediate frequency receiving channel to perform receiving off-line calibration on the zero intermediate frequency receiving channel; and constructing and utilizing a filter coefficient on the zero intermediate frequency receiving path, simulating the amplitude and phase imbalance of the receiving branch path, and performing receiving mirror frequency off-line calibration on the zero intermediate frequency receiving path.
6. The transceiver of claim 1, wherein the predetermined time comprises a control calibration switching period or a transceiver switching time slot.
7. An operating method of a transceiver, wherein the transceiver comprises a zero-if transmit path, a zero-if receive path, a feedback control link, and a calibration apparatus, the operating method comprising:
the feedback control link acquires a transmitting signal of the zero intermediate frequency transmitting path, generates a feedback signal according to the transmitting signal, and calibrates the zero intermediate frequency transmitting path according to the feedback signal;
the calibration device carries out online calibration on the zero intermediate frequency transmitting path, the zero intermediate frequency receiving path and the feedback control link;
the calibration device for performing online calibration on the zero intermediate frequency transmission path, the zero intermediate frequency reception path and the feedback control link comprises: when the zero intermediate frequency transmission circuit works normally, the power amplifier of the zero intermediate frequency transmission circuit is started; controlling the feedback control link to obtain a transmitting signal of the zero intermediate frequency transmitting channel, and performing digital predistortion detection, standing wave detection and power detection according to the transmitting signal; carrying out receiving image frequency on-line calibration on the zero intermediate frequency receiving channel by using service data; and after the preset time, controlling the feedback control link to stop acquiring the transmitting signal of the zero intermediate frequency transmitting channel, performing transmitting local oscillator leakage on-line calibration and transmitting image frequency on-line calibration on the zero intermediate frequency transmitting channel by using the service data, and performing feedback image frequency on-line calibration on the feedback control link by using the service data.
8. The method of claim 7, wherein the feedback control link obtains a transmit signal of the zero intermediate frequency transmit path, and wherein calibrating the zero intermediate frequency transmit path based on the transmit signal comprises: and the feedback control link determines the transmitting power of the zero intermediate frequency transmitting path according to the transmitting signal, generates a feedback signal according to the transmitting power, and assists to calibrate the zero intermediate frequency transmitting path according to the feedback signal.
9. The method of operation of claim 7, further comprising: the transceiver comprises a plurality of zero intermediate frequency transmitting paths, and the feedback control link calibrates each zero intermediate frequency transmitting path in a time division multiplexing mode.
10. The method of operation of any one of claims 7 to 9, further comprising: the calibration device performs off-line calibration on the zero intermediate frequency transmitting path, the zero intermediate frequency receiving path and the feedback control link, wherein the off-line calibration refers to calibration performed before normal operation when equipment is initialized.
11. The method of claim 10, wherein the calibrating means performing offline calibration on the zero if transmit path, the zero if receive path, and the feedback control link comprises: when initializing, closing the power amplifier of the zero intermediate frequency transmitting access; utilizing an internal calibration source of the zero intermediate frequency transmission channel to perform transmission local oscillator leakage off-line calibration on the zero intermediate frequency transmission channel; constructing and utilizing a filter coefficient on the zero intermediate frequency transmitting path, simulating the amplitude and phase imbalance of the transmitting branch path, and performing transmitting mirror frequency off-line calibration on the zero intermediate frequency transmitting path; feedback off-line calibration is carried out on the feedback control link by utilizing an internal calibration source of the feedback control link; constructing and utilizing a filter coefficient on the feedback control link, simulating the amplitude and phase imbalance of a feedback shunt circuit, and performing feedback image frequency off-line calibration on the feedback control link; utilizing an internal calibration source of the zero intermediate frequency receiving channel to perform receiving off-line calibration on the zero intermediate frequency receiving channel; and constructing and utilizing a filter coefficient on the zero intermediate frequency receiving path, simulating the amplitude and phase imbalance of the receiving branch path, and performing receiving mirror frequency off-line calibration on the zero intermediate frequency receiving path.
12. The method of claim 7, wherein the predetermined time comprises a control calibration switching period or a transmit-receive switching slot.
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| CN201510665005.0A CN106603108B (en) | 2015-10-15 | 2015-10-15 | Transceiver and working method |
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| CN107707264A (en) * | 2017-08-31 | 2018-02-16 | 希姆通信息技术（上海）有限公司 | Power detection feedback circuit and method |
| CN109586758B (en) * | 2017-09-28 | 2020-11-17 | 瑞昱半导体股份有限公司 | Interference elimination method and transmitting and receiving device |
| CN108736913A (en) * | 2018-05-11 | 2018-11-02 | 深圳国人通信股份有限公司 | The calibration method and system of the DC component of zero intermediate frequency transceiving chip |
| CN113067590B (en) * | 2019-12-30 | 2022-09-23 | 华为技术有限公司 | Wireless device, method and related equipment |
| CN112422167B (en) * | 2020-10-27 | 2022-12-09 | 北京空间飞行器总体设计部 | Zero-value calibration method for multi-channel high-precision distance measuring transceiver |
| CN113691278B (en) * | 2021-10-26 | 2022-02-08 | 广东省新一代通信与网络创新研究院 | Time division mode multi-frequency band transceiver and multi-frequency band signal transmitting and receiving method |
| CN114326924B (en) * | 2022-03-03 | 2022-06-17 | 阿里巴巴达摩院(杭州)科技有限公司 | Signal processing method and storage medium |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6670901B2 (en) * | 2001-07-31 | 2003-12-30 | Motorola, Inc. | Dynamic range on demand receiver and method of varying same |
| CN1554154A (en) * | 2000-10-02 | 2004-12-08 | 英特赛尔美国公司 | A calibrated DC compensation system for a wireless communication device configured in a zero intermediate frequency architecture |
| CN101222741A (en) * | 2008-01-25 | 2008-07-16 | 中兴通讯股份有限公司 | Device and method for calibrating zero intermediate frequency transmitting parameter of base station |
| CN101616125A (en) * | 2008-06-26 | 2009-12-30 | 大唐移动通信设备有限公司 | The method that a kind of zero intermediate frequency transmitter and calibration zero intermediate frequency transmit |
| CN101651474A (en) * | 2008-08-12 | 2010-02-17 | 大唐移动通信设备有限公司 | Multi-antenna zero-intermediate-frequency transmitter and calibration method thereof |
| CN102694758A (en) * | 2012-04-11 | 2012-09-26 | 上海聚星仪器有限公司 | Online calibration method for radio frequency front-end receiving-transmitting link |
| CN104580060A (en) * | 2015-01-20 | 2015-04-29 | 重庆邮电大学 | Digital pre-distortion correcting device and method against IQ unbalance distortion |
-
2015
- 2015-10-15 CN CN201510665005.0A patent/CN106603108B/en active Active
-
2016
- 2016-07-18 WO PCT/CN2016/090316 patent/WO2017063415A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1554154A (en) * | 2000-10-02 | 2004-12-08 | 英特赛尔美国公司 | A calibrated DC compensation system for a wireless communication device configured in a zero intermediate frequency architecture |
| US6670901B2 (en) * | 2001-07-31 | 2003-12-30 | Motorola, Inc. | Dynamic range on demand receiver and method of varying same |
| CN101222741A (en) * | 2008-01-25 | 2008-07-16 | 中兴通讯股份有限公司 | Device and method for calibrating zero intermediate frequency transmitting parameter of base station |
| CN101616125A (en) * | 2008-06-26 | 2009-12-30 | 大唐移动通信设备有限公司 | The method that a kind of zero intermediate frequency transmitter and calibration zero intermediate frequency transmit |
| CN101651474A (en) * | 2008-08-12 | 2010-02-17 | 大唐移动通信设备有限公司 | Multi-antenna zero-intermediate-frequency transmitter and calibration method thereof |
| CN102694758A (en) * | 2012-04-11 | 2012-09-26 | 上海聚星仪器有限公司 | Online calibration method for radio frequency front-end receiving-transmitting link |
| CN104580060A (en) * | 2015-01-20 | 2015-04-29 | 重庆邮电大学 | Digital pre-distortion correcting device and method against IQ unbalance distortion |
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| WO2017063415A1 (en) | 2017-04-20 |
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