CN115002888A - Radio frequency system, control method thereof and wireless communication equipment - Google Patents
Radio frequency system, control method thereof and wireless communication equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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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
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The embodiment of the application discloses a radio frequency system, a control method thereof and wireless communication equipment, and improves the power control accuracy of the radio frequency system. The control method of the radio frequency system comprises the following steps: when the radio frequency transceiver sends an uplink signal, the uplink feedback signal is received through an uplink feedback channel, the power of the output signal of the power amplification module is calculated according to the power of the uplink feedback signal and the pre-acquired uplink feedback loss power, and when the calculated difference value between the power of the output signal of the power amplification module and the target power is larger than a first preset threshold value, the transmitting power of the uplink signal is adjusted, so that the difference value between the power of the output signal of the power amplification module and the target power is smaller than the first preset threshold value. In this embodiment, the power control of the uplink signal is performed according to the power of the uplink feedback signal and the uplink feedback loss power obtained by pre-calculation, so that the forward feedback of the radio frequency system can be realized, and the accuracy of the power control can be improved.
Description
Technical Field
The embodiment of the disclosure relates to, but not limited to, the technical field of antenna radio frequency, and in particular relates to a radio frequency system, a control method thereof and wireless communication equipment.
Background
With the development and progress of the technology, mobile communication technology is gradually beginning to be applied to communication devices. In the communication process, when the signal is weak, the device generally increases the transmission power to realize data transmission and basic communication, but increasing the transmission power increases power consumption and deteriorates linearity and Error Vector Magnitude (EVM) of the power amplifier element, which inevitably leads to a decrease in throughput rate. In addition, as the internal devices of the communication device age, the power output by the power amplifier element increases, and the performance of the antenna deteriorates, which eventually results in the obvious deterioration of the actual use experience.
Disclosure of Invention
The embodiment of the disclosure provides a radio frequency system, a control method thereof and wireless communication equipment, and improves the power control accuracy of the radio frequency system.
In one aspect, an embodiment of the present disclosure provides a radio frequency system, including a radio frequency transceiver, a power amplification module, a coupler module, a first switch module, and an antenna module, where the radio frequency transceiver, the power amplification module, and the antenna module are sequentially connected to form a signal transceiving channel, and the coupler module is connected to the radio frequency transceiver through the first switch module to form a feedback channel, where:
the first switch module is configured to switch on an uplink feedback channel in the feedback channels when the radio frequency transceiver sends an uplink signal, so that the uplink feedback signal received by the coupler module is sent to the radio frequency transceiver through the uplink feedback channel;
the radio frequency transceiver is configured to calculate power of the signal output by the power amplification module according to the acquired power of the uplink feedback signal and pre-acquired uplink feedback loss power, and when the calculated difference between the power of the signal output by the power amplification module and a target power is larger than a first preset threshold, adjust the transmitting power of the uplink signal so that the difference between the power of the signal output by the power amplification module and the target power is smaller than the first preset threshold.
On the other hand, the embodiment of the present disclosure further provides a control method for a radio frequency system, which is applicable to the radio frequency system, and the control method includes:
when the radio frequency transceiver sends an uplink signal, the uplink feedback signal is received through an uplink feedback channel, the power of the output signal of the power amplification module is calculated according to the power of the uplink feedback signal and the pre-acquired uplink feedback loss power, and when the calculated difference value between the power of the output signal of the power amplification module and the target power is larger than a first preset threshold value, the transmitting power of the uplink signal is adjusted, so that the difference value between the power of the output signal of the power amplification module and the target power is smaller than the first preset threshold value.
In still another aspect, an embodiment of the present disclosure further provides a wireless communication device including the foregoing radio frequency system.
According to the embodiment of the disclosure, the power control is performed on the uplink signal according to the power of the uplink feedback signal and the uplink feedback loss power obtained through pre-calculation, so that the forward feedback of the radio frequency system can be realized, and the accuracy of the power control can be improved.
Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the disclosure. Other advantages of the disclosure may be realized and attained by the instrumentalities and methods described in the specification, claims, and drawings.
Drawings
The accompanying drawings are included to provide an understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure. The shapes and sizes of the various elements in the drawings are not to be considered as true proportions, but are merely intended to illustrate the present disclosure.
Fig. 1 is a schematic diagram of an architecture of a radio frequency system according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of another rf system according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of an architecture of a radio frequency system according to another embodiment of the present disclosure;
fig. 4 is a flowchart of a radio frequency system control method according to an embodiment of the disclosure.
Detailed Description
The present disclosure describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described in the present disclosure. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.
The present disclosure includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements of the present disclosure that have been disclosed may also be combined with any conventional features or elements to form unique inventive aspects as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the claims. Thus, it should be understood that any features shown and/or discussed in this disclosure may be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be restricted except in light of the attached claims and their equivalents. Further, various modifications and changes may be made within the scope of the appended claims.
Further, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Further, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present disclosure.
Herein, the uplink feedback may also be referred to as forward feedback or forward feedback, e.g., the uplink feedback channel may be referred to as a forward feedback channel or a forward feedback channel, and the uplink feedback signal may be referred to as a forward feedback signal or a forward feedback signal. The downlink feedback may also be referred to as a reverse feedback, for example, the downlink feedback channel may be referred to as a reverse feedback channel, and the downlink feedback signal may be referred to as a reverse feedback signal.
In order to realize power control, the present disclosure provides a radio frequency system, as shown in fig. 1, including a radio frequency transceiver, a power amplification module (PA), a Coupler (CPL) module, a first switch module and an antenna module, where the radio frequency transceiver is connected to the power amplification module, the power amplification module is connected to the antenna module to form a signal transceiving channel, the coupler module is connected to the first switch module, and the first switch module is connected to the radio frequency transceiver to form a feedback channel, where:
the first switch module is configured to switch on an uplink feedback channel in the feedback channels when the radio frequency transceiver sends an uplink signal, so that the uplink feedback signal received by the coupler module is sent to the radio frequency transceiver through the feedback channels, and the uplink feedback signal is a feedback signal of the uplink signal at the moment;
the radio frequency transceiver is configured to calculate power of a signal output by the power amplification module according to the acquired power of the uplink feedback signal and the pre-acquired uplink feedback loss power, and when a difference between the calculated power of the signal output by the power amplification module (i.e., air interface power) and a target power (or called target air interface power) is greater than a first preset threshold, adjust transmission power of the uplink signal, so that the difference between the calculated power of the signal output by the power amplification module and the target power is smaller than the first preset threshold.
In the uplink working state, the coupler module receives a feedback signal of an uplink signal, the feedback signal is an uplink feedback signal at the moment, and the used feedback path is an uplink feedback path. In an uplink working state, the coupler module receives a reflected signal of an uplink signal, the reflected signal is a downlink feedback signal at the moment, and a used feedback path is a downlink feedback path. The coupling directions of the uplink feedback signal and the downlink feedback signal are different, so that the used feedback channels are different, and the first switch module is used for switching the uplink feedback channel and the downlink feedback channel.
The coupler module may be integrated in the power amplification module, or in the first switch module, or separately. The coupler module can be realized by a microstrip line coupler or an active coupler. The number of the couplers in the coupler module can be determined according to the number of the signal paths, and for example, by adopting a microstrip line coupler, a microstrip line coupler can be arranged in the forward feedback channel, and a microstrip line coupler can be arranged in the reverse feedback channel; taking the example of an active coupler, the forward feedback path and the backward feedback path may share one coupler.
The uplink Feedback may be referred to as a Feedback Receiver (FBRX) detection technology, and is a technology for acquiring a Feedback signal through the CPL to detect and control a transmission signal. A radio frequency transceiver (having one FBRX input port) generates and transmits a signal through an antenna. The transmitting signal is sampled by the CPL, and an FBRX signal (i.e., the aforementioned uplink feedback signal) is obtained. The forward and reverse directions shown in the drawings of the present application are merely examples, and the forward and reverse directions are different.
In this embodiment, the power control of the uplink signal is performed according to the power of the uplink feedback signal and the uplink feedback loss power obtained by pre-calculation, so that the forward feedback of the radio frequency system can be realized, and the accuracy of the power control can be improved.
The forward feedback loss power represents the power loss from the output position of the power amplification module in the uplink transmission path to the coupler, and can be obtained in a calibration stage in advance, in the calibration stage, the first switch module is switched to the uplink feedback channel, the radio frequency transceiver sends an uplink signal to the power amplification module, the power amplification module outputs the uplink signal, the power (hereinafter referred to as air interface power) of the output signal of the power amplification module is obtained through instrument testing, the coupler receives the uplink feedback signal, the uplink feedback signal is sent to the radio frequency transceiver through the uplink feedback channel, the radio frequency transceiver obtains the power (hereinafter referred to as uplink feedback power) of the uplink feedback signal, and the difference between the uplink feedback power and the air interface power is calculated, wherein the difference is the uplink feedback loss power. Alternatively, it may be measured and calculated multiple times, and averaged to obtain the forward feedback loss power.
In an exemplary embodiment, the radio frequency transceiver may be further configured to obtain a frequency spectrum of an output signal of the power amplification module according to the frequency spectrum of the uplink signal and the frequency spectrum of the uplink feedback signal, determine noise in the frequency spectrum of the output signal of the power amplification module according to the frequency spectrum of the output signal of the power amplification module, and send a predistortion signal having the same magnitude and the opposite direction as the noise when transmitting the uplink signal, where the predistortion signal is a Digital Pre-Distortion (DPD) process, and the noise may be cancelled out through the DPD process to improve a sideband snr. Wherein the signal in the spectral sideband region can be used as noise.
The digital predistortion technology can be cascaded through a predistortion element (Predistorter) and a power amplification module, and a nonlinear distortion function is built in a digital baseband signal processing domain and is equivalent to (equal to) the distortion quantity displayed by the power amplification module, but the function is opposite. The challenge of digital predistortion techniques is that the distortion (i.e., non-linear) characteristics of the PA vary with time, temperature, and bias (biasing), which may vary from device to device. Thus, although it is possible to characterize and design the correct predistortion algorithm for one device, it is economically infeasible to do this for every device. To solve the above-mentioned deviation, a feedback mechanism is used in the present embodiment to sample the output signal and to correct the predistortion algorithm. Digital predistortion can be implemented using digital circuitry, for example, by adding a nonlinear circuit to compensate for the nonlinearity of the power amplifier module, thereby enabling a highly linear, distortion-free system. This allows the use of a simple class AB platform within the power amplifier module, thereby eliminating the burden and complexity of base station manufacturers in manufacturing feed forward amplifiers (feed forward amplifiers). In addition, the power amplification module does not need an error amplifier distortion correction circuit any more, so that the system efficiency can be obviously improved.
Optionally, the digital predistortion processing may be triggered at one or more of the following occasions: every preset time period, channel switching and cell switching.
In an exemplary embodiment, the first switch module is further configured to switch on the downlink feedback channel when the radio frequency transceiver transmits the uplink signal, so that the downlink feedback signal received by the coupler is transmitted to the radio frequency transceiver through the downlink feedback channel, the downlink feedback signal is a reflection signal of the uplink signal transmitted by the radio frequency transceiver, and the direction of the reflection signal is opposite to that of the uplink signal; the radio frequency transceiver is further configured to calculate a power difference between the uplink feedback signal and the downlink feedback signal, and when a difference between the power difference and the reference power is greater than a second preset threshold, or a standing-wave ratio is calculated according to the power difference and the reference power, if the standing-wave ratio is greater than a third preset threshold, it is indicated that the downlink feedback signal is large, so that the power difference is smaller than the second preset threshold or the standing-wave ratio is smaller than the third preset threshold by adjusting an antenna tuner located in the antenna module and/or performing channel switching. The purpose of controlling the power difference between the uplink feedback signal and the downlink feedback signal is to ensure the antenna gain. The antenna transmitting performance can be improved by adjusting the antenna tuner, if the difference value between the adjusted power difference and the reference power is smaller than a second preset threshold value, or the standing-wave ratio is smaller than a third preset threshold value, the requirement is considered to be met, and if the difference value between the adjusted power difference and the reference power is still larger than the second preset threshold value after multiple times of adjustment, or the standing-wave ratio is still larger than the third preset threshold value, the adjustment can be carried out through channel switching.
The reference power can be obtained in a calibration stage in advance, in the calibration stage, the first switch module is connected to the uplink feedback channel, the radio frequency transceiver sends an uplink signal to the power amplification module, the power amplification module outputs the uplink signal, the power of the signal output by the power amplification module can be obtained through instrument testing, the coupler receives the uplink feedback signal, the uplink feedback signal is sent to the radio frequency transceiver through the uplink feedback channel, the radio frequency transceiver obtains the power of the uplink feedback signal, namely the uplink feedback power, and the difference value between the uplink feedback power and the power of the signal output by the power amplification module is calculated to serve as uplink feedback loss power. And then, keeping the state that the radio frequency transceiver sends the uplink signal, switching on the downlink feedback channel by the first switch module, receiving a reflected signal of the uplink signal, namely a downlink feedback signal, by the coupler, calculating the power difference between the power of the downlink feedback signal and the power of the signal output by the power amplification module to be used as downlink feedback loss power, and using the difference between the uplink feedback loss power and the downlink feedback loss power as reference power. In the calibration phase, the impedances of the antenna and the feeder are in perfect match, so the difference between the power losses obtained in the calibration phase can be used as a reference parameter.
In an exemplary embodiment, when the antenna module includes multiple antennas, as shown in fig. 2, a second switch module may be further included between the power amplification module and the antenna module, and the second switch module is configured to switch a path between the power amplification module and the antenna, and by setting the second switch module to switch different antennas, the aforementioned power control may be performed on each antenna (each transmission channel), respectively. The coupler may also be integrated into the second switch module.
In an exemplary embodiment, for a multiple-input multiple-output (MIMO) system, as shown in fig. 3, the radio frequency system further includes a second switch module, the antenna module includes multiple antennas, the power amplification module includes multiple power amplifiers, the coupler module includes multiple couplers, each power amplifier is connected to the second switch module, the second switch modules are respectively connected to the multiple antennas, the second switch module is configured to switch paths between the power amplifiers and the antennas, and each coupler is configured to couple signals on paths between one antenna and one power amplifier. Specifically, a coupler for receiving the downlink feedback signal may be provided for each transmission channel in the radio frequency system, the coupler may be implemented by a microstrip line coupler, and the coupler for receiving the uplink feedback signal may be integrated inside the PA, or an independent active coupler may be provided at an output port of the PA, or may also be implemented by a microstrip line coupler. In the MIMO scheme, the first switch module may be an SPNT (single pole multiple throw switch) and the second switch module may be a DPNT (double pole multiple throw switch). The power control and the antenna performance adjustment of different antenna paths can be realized by switching the first switch module and the second switch module, and the specific adjustment method can refer to the single-antenna realization mode.
The embodiment of the present disclosure further provides a control method of a radio frequency system, as shown in fig. 4, which can improve accuracy of power control, where the radio frequency system may be the radio frequency system in the foregoing embodiment, and the control method includes:
when the radio frequency transceiver sends an uplink signal, the uplink feedback signal is received through a feedback channel, the power of the output signal of the power amplification module is calculated according to the power of the uplink feedback signal and the pre-acquired uplink feedback loss power, and when the calculated difference value between the power of the output signal of the power amplification module and the target power is larger than a first preset threshold value, the transmitting power of the uplink signal is adjusted, so that the difference value between the power of the output signal of the power amplification module and the target power is smaller than the first preset threshold value.
In this embodiment, by using the control method, the power of the transmitted uplink signal is controlled according to the power of the uplink feedback signal and the predetermined uplink feedback loss power, so that the forward feedback of the radio frequency system can be realized, and the accuracy of power control can be improved.
The uplink feedback loss power can be obtained in a calibration stage in advance, in the calibration stage, the first switch module is connected with an uplink feedback channel, the radio frequency transceiver sends an uplink signal to the power amplification module, the power amplification module outputs the uplink signal, the power of the signal output by the power amplification module is obtained through instrument testing, the coupler receives the uplink feedback signal, the uplink feedback signal is sent to the radio frequency transceiver through the uplink feedback channel, the radio frequency transceiver obtains the uplink feedback power of the uplink feedback signal, the difference value between the uplink feedback power and the power of the signal output by the power amplification module is calculated, and the difference value is the uplink feedback loss power.
In an exemplary embodiment, the spectrum of the output signal of the power amplification module may be obtained according to the spectrum of the uplink signal and the spectrum of the uplink feedback signal (for example, by superimposing the two spectrums), the noise in the spectrum is determined according to the spectrum of the output signal of the power amplification module, when the uplink signal is transmitted, a predistortion signal having the same magnitude as the noise and the opposite direction is simultaneously transmitted, and the noise may be cancelled out by the digital predistortion processing, so as to improve the sideband snr. Optionally, this process may be triggered at one or more of the following occasions: every preset time period, channel switching and cell switching.
In an exemplary embodiment, the method further comprises: when the radio frequency transceiver sends an uplink signal, the downlink feedback signal received by the coupler is obtained through the downlink feedback channel, the power difference between the uplink feedback signal and the downlink feedback signal is calculated, when the difference value between the power difference and the reference power is larger than a second preset threshold value, the downlink feedback signal is indicated to be larger, the power difference between the uplink feedback signal and the downlink feedback signal can be calculated by adjusting an antenna tuner positioned in the antenna module and/or performing channel switching so that the difference value between the power difference and the reference power is smaller than the second preset threshold value, or when the radio frequency transceiver sends the uplink signal, the downlink feedback signal received by the coupler is obtained through the downlink feedback channel, the power difference between the uplink feedback signal and the downlink feedback signal is calculated, a standing-wave ratio is calculated according to the power difference and the reference power, and if the standing-wave ratio is larger than a third preset threshold value, the antenna tuner positioned in the antenna module is adjusted and/or performing channel switching is performed, and enabling the standing-wave ratio to be smaller than the third preset threshold, wherein the downlink feedback signal is a reflection signal of the uplink signal.
The reference power is obtained by the following method: in the calibration stage, controlling a radio frequency transceiver to send an uplink signal, obtaining the power of a signal output by the power amplification module through instrument test, receiving an uplink feedback signal through an uplink feedback channel, and calculating the difference value between the power of the uplink feedback signal and the power of the signal output by the power amplification module to be used as uplink feedback loss power; and controlling the radio frequency transceiver to send an uplink signal, receiving a downlink feedback signal through a downlink feedback channel, calculating a difference value between the power of the downlink feedback signal and the power of a signal output by the power amplification module to be used as downlink feedback loss power, and calculating a difference value between the uplink feedback loss power and the downlink feedback loss power to be used as the reference power.
In an exemplary embodiment, the power difference between the uplink feedback signal and the downlink feedback signal may be calculated at any one or more of the following timings, and the predistortion signal may be sent: every preset time period, channel switching and cell switching.
As will be described below by using a specific example, the uplink feedback may be used for power detection and DPD algorithm processing, and the downlink feedback may be used for standing wave detection to adjust antenna gain and optimize performance. The feedback signal may be obtained through a coupling microstrip line (which may be disposed between the power amplification module and the antenna), or may be obtained through a coupler disposed inside the power amplification module, or may be obtained through a coupler disposed inside the first switch module.
In this example, a dual antenna is taken as an example for illustration, the rf transceiver is connected to a power amplifier module (PA-Mid), the PA-Mid is connected to a second switch module, and the second switch module is connected to the antenna module. The rf transceiver outputs a transmission signal, where the transmission signal may include a 2G signal and/or a non-2G signal (e.g., a 3G, 4G, or 5G signal), the transmission signal is output to the antenna through the second switch module after being output by the power amplification module, the transmission signal is received by the coupler and then is output to the rf transceiver through the first switch module, and the coupler may be located between the PA or the second switch module, or may be a microstrip line coupler, and is located between the PA and the second switch module. The first switch module is a single-pole double-throw Switch (SPDT) and the second switch module is a DPDT.
The calibration process comprises uplink calibration and downlink calibration, the impedance of the antenna and the feeder line is completely matched in the calibration state, and the calculated parameters can be regarded as reference values in an ideal state, wherein:
the uplink calibration process comprises the following steps: the radio frequency transceiver sends an uplink signal, the power P1, or called as air interface power, of the output signal of the power amplification module is obtained at the test seat position through an integrated test instrument, and simultaneously the SPDT is switched to an uplink feedback channel, at this time, the uplink feedback channel is opened, the radio frequency transceiver obtains the power (i.e., uplink feedback power) P2 of the uplink feedback signal through coupling in a preset proportion, i.e., the power of an FBRX signal received by an FBRX interface of the radio frequency transceiver, and the difference between the uplink feedback power and the air interface power is the Loss power of uplink feedback (Loss1 ═ P2-P1), and the Loss power represents the relative relationship between the uplink feedback power and the air interface power.
The downlink calibration process comprises the following steps: the radio frequency transceiver is kept sending the uplink signal, the SPDT is switched to the downlink feedback channel, at this time, the downlink feedback channel is opened, the radio frequency transceiver obtains a reflected signal of the uplink signal, that is, the power of the downlink feedback signal (that is, downlink feedback power) P3 through coupling in a preset proportion, the difference between the downlink feedback power and the air interface power is the Loss power of the downlink feedback (Loss2 is P3-P1), and the Loss power represents the relative relationship between the downlink feedback power and the air interface power.
The uplink feedback Loss power and the downlink feedback Loss power can be obtained through an uplink calibration process and a downlink calibration process, and then the Loss power difference Lossa between the uplink feedback Loss power and the downlink feedback Loss power under the impedance matching state of the test seat position is calculated, wherein Lossa is Loss1-Loss2 is P2-P3, the Loss power difference can be used as the basis of subsequent standing wave improvement, namely, the reference value of standing wave detection, and Lossa is written into an internal storage table. In the matching state, the uplink signal is not reflected, the downlink feedback power is low at the moment, and in the working state, the uplink signal has a reflected signal, so that the matching quality in the working state can be judged by measuring the downlink feedback signal.
Digital pre-distortion processing and/or standing wave detection can be performed during normal operation, wherein:
digital pre-distortion treatment: when the power amplifier works in an uplink mode, the SPDT is switched to the uplink feedback channel, the radio frequency transceiver can obtain uplink feedback power through the uplink feedback channel, the output power of the power amplification module can be calculated by the uplink feedback power plus the uplink feedback Loss power Loss1 according to the uplink feedback Loss power obtained in the calibration process, then whether the difference value between the output power of the power amplification module and the target power is within a first preset threshold value can be judged, the target power can be set according to needs, if the difference value exceeds the first preset threshold value, the output power of the power amplification module does not meet the requirements, the transmitting power value can be adjusted, the output power of the power amplification module is enabled to be closer to the target air interface power, and therefore real-time closed-loop power control and adjustment can be achieved.
In addition, the radio frequency transceiver can carry out digital predistortion treatment on the transmitting signal in the radio frequency transceiver according to the digital domain spectrum characteristics fed back by the uplink, and iteration is carried out. Specifically, the frequency spectrum of the output signal of the power amplification module can be calculated according to the frequency spectrum of the transmission signal and the frequency spectrum of the uplink feedback signal, the noise of the air interface signal (the sideband area is determined as the noise) can be determined according to the frequency spectrum of the output signal of the power amplification module, and the pre-distortion of the transmission signal is realized by sending a signal which is equal to the noise and is opposite to the noise in direction at the same time of transmitting the signal. This process may be triggered at one or more of the following occasions: every preset time period (for example, 10s), at the time of channel switching, at the time of cell switching. The air interface performance can be optimized through digital predistortion processing, ACR is improved, and the sideband signal-to-noise ratio is improved. By carrying out noise judgment and digital predistortion processing in real time in the working process, compared with a method for fixing a predistortion signal in production test, the method is more accurate in power control. Although the mobile phone motherboard can test power during production test, the power fluctuation is large mainly because the mobile phone transmission link is complex, and the number of various active devices and resistance-capacitance sensors is large, so that the influence of batch fluctuation and difference superposition is increased, and the power difference is large.
And (3) standing wave detection: during normal communication, the SPDT is switched to the uplink feedback channel, the radio frequency transceiver can obtain the power of the uplink feedback signal, i.e. the uplink feedback power P4, obtained by the coupler, the SPDT is switched to the downlink feedback channel, the radio frequency transceiver obtains the power of the downlink feedback signal, i.e. the downlink feedback power P5, the power difference LossB (LossB ═ P4-P5) between the uplink feedback signal and the downlink feedback signal is calculated, if the antenna efficiency is good, the downlink feedback signal power is small, the power difference between the uplink feedback signal and the downlink feedback signal is relatively large, otherwise, if the power difference between the uplink feedback signal and the downlink feedback signal is large, the standing wave performance is poor, and the antenna radiation efficiency is poor, for example, the judgment can be performed by comparing the LossB with the reference value LossA, for example, judging whether the LossB-LossA is larger than the second preset threshold, if it is larger, the radiation efficiency of the antenna can be improved by adjusting an antenna resonator (Turner) which is located inside the antenna module and which changes the resonance parameters by connecting different paths. If the improvement of the resonance parameter still cannot improve the antenna radiation efficiency, that is, the power difference between the uplink feedback signal and the downlink feedback signal is still greater than the second preset threshold, the channel switching may also be attempted until the power difference between the uplink feedback signal and the downlink feedback signal is less than the second preset threshold.
For another example, during calibration, the power difference LossA of the uplink feedback and the downlink feedback in the matching state is calculated by switching the uplink feedback channel and the downlink feedback channel, then the power difference LossB of the uplink feedback and the downlink feedback in the normal working state is calculated by switching the uplink feedback channel and the downlink feedback channel in the normal uplink working state, and the standing-wave ratio VSWR is calculated by means of Loss in the calibration and normal working states, and the specific calculation formula can refer to: and VSWR is 10^ ((Lossa-LossB)/(LossA + LossB)), wherein LossA and LossB can be converted into constants to be calculated, the antenna resonator and/or the channel switching are adjusted according to the standing-wave ratio, and when the standing-wave ratio is greater than a third preset threshold, the antenna tuner in the antenna module is adjusted and/or the channel switching is performed until the standing-wave ratio result meets the preset requirement, namely the standing-wave ratio is less than the third preset threshold.
Alternatively, the result of the calibration may be written in a table, for example, the power difference LossB and the corresponding adjustment mode are recorded, and only the table needs to be looked up in the subsequent adjustment.
Optionally, the above process may also be triggered at one or more of the following occasions: every preset time period (for example, 10s), at the time of channel switching, at the time of cell switching. The antenna gain can be adjusted through the standing wave detection, and the antenna performance is optimized.
Through the scheme of the embodiment, the power control accuracy can be effectively improved, and the air interface performance and the antenna performance are improved. For example, in a weak signal scenario, an uplink ACLR (Adjacent Channel Leakage Ratio) and EVM (error vector magnitude) are measured through a forward feedback signal, and an optimal ACLR and EVM are sought through switching channels and/or cells.
The embodiment of the disclosure also provides a wireless communication device comprising the radio frequency system. The wireless communication device according to the embodiments of the present disclosure may include various handheld devices, vehicle-mounted devices, virtual reality/augmented reality devices, wireless headsets, smart home devices, wearable devices, computing devices, or other processing devices connected to a wireless modem, and various forms of User Equipment (UE) (e.g., Mobile phone), Mobile Station (MS), terminal device (terminal device), and the like.
The smart home equipment can be at least one of the following: the intelligent electric cooker comprises an intelligent watch, an intelligent sound box, an intelligent television, an intelligent refrigerator, an intelligent washing machine, an intelligent lamp, an intelligent closestool, an intelligent electric cooker, an intelligent clothes hanger, an intelligent massage chair, intelligent furniture, an intelligent sensor, an intelligent door and window, an intelligent router, an intelligent gateway, an intelligent switch panel and the like, and is not limited herein.
In the description of the embodiments of the present disclosure, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, or suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (10)
1. A radio frequency system is characterized by comprising a radio frequency transceiver, a power amplification module, a coupler module, a first switch module and an antenna module, wherein the radio frequency transceiver, the power amplification module and the antenna module are sequentially connected to form a signal transceiving channel, the coupler module is connected with the radio frequency transceiver through the first switch module to form a feedback channel, and the radio frequency system comprises:
the first switch module is configured to switch on an uplink feedback channel in the feedback channels when the radio frequency transceiver sends an uplink signal, so that the uplink feedback signal received by the coupler module is sent to the radio frequency transceiver through the uplink feedback channel;
the radio frequency transceiver is configured to calculate power of the output signal of the power amplification module according to the acquired power of the uplink feedback signal and the pre-acquired uplink feedback loss power, and when the calculated difference value between the power of the output signal of the power amplification module and the target power is larger than a first preset threshold value, adjust the transmitting power of the uplink signal so that the difference value between the power of the output signal of the power amplification module and the target power is smaller than the first preset threshold value.
2. The radio frequency system of claim 1,
the radio frequency transceiver is also configured to determine noise in the frequency spectrum according to the frequency spectrum of the signal output by the power amplification module, and send a predistortion signal with the same size and the opposite direction as the noise when transmitting an uplink signal.
3. The radio frequency system according to claim 1,
the first switch module is further configured to switch on a downlink feedback channel in the feedback channels when the radio frequency transceiver sends an uplink signal, so that the downlink feedback signal received by the coupler is sent to the radio frequency transceiver through the downlink feedback channel, and the downlink feedback signal is a reflected signal of the uplink signal;
the radio frequency transceiver is also configured to calculate a power difference between the uplink feedback signal and the downlink feedback signal, and when a difference value between the power difference and the reference power is greater than a second preset threshold, an antenna tuner in the antenna module is adjusted and/or channel switching is performed, so that a difference value between the power difference and the reference power is smaller than the second preset threshold; or, the radio frequency transceiver is further configured to calculate a power difference between an uplink feedback signal and a downlink feedback signal, calculate a standing-wave ratio according to the power difference and a reference power, and adjust an antenna tuner located in the antenna module and/or perform channel switching if the standing-wave ratio is greater than a third preset threshold, so that the standing-wave ratio is smaller than the third preset threshold.
4. The radio frequency system according to claim 1,
the radio frequency system further comprises a second switch module, wherein the second switch module is arranged between the power amplification module and the antenna module and is configured to switch a path between the power amplification module and the antenna.
5. The radio frequency system according to claim 1,
the radio frequency system further comprises a second switch module, the antenna module comprises a plurality of antennas, the power amplification module comprises a plurality of power amplifiers, the coupler module comprises a plurality of couplers, each power amplifier is connected with the second switch module, the second switch module is respectively connected with the plurality of antennas, the second switch module is configured to switch a path between the power amplifiers and the antennas, and each coupler is configured to couple signals on the path between one antenna and one power amplifier.
6. A control method for a radio frequency system, adapted to the radio frequency system according to any one of claims 1 to 5, the control method comprising:
when the radio frequency transceiver sends an uplink signal, the uplink feedback signal is received through an uplink feedback channel, the power of the output signal of the power amplification module is calculated according to the power of the uplink feedback signal and the pre-acquired uplink feedback loss power, and when the calculated difference value between the power of the output signal of the power amplification module and the target power is larger than a first preset threshold value, the transmitting power of the uplink signal is adjusted, so that the difference value between the power of the output signal of the power amplification module and the target power is smaller than the first preset threshold value.
7. The control method according to claim 6,
the uplink feedback loss power is obtained by adopting the following method: in the calibration stage, the radio frequency transceiver is controlled to send an uplink signal, the power of the signal output by the power amplification module is obtained through instrument test, the uplink feedback signal is received through the uplink feedback channel, the difference value between the power of the uplink feedback signal and the power of the signal output by the power amplification module is calculated, and the difference value is used as uplink feedback loss power.
8. The control method according to claim 6,
the method further comprises the following steps: and determining noise in the frequency spectrum according to the frequency spectrum of the signal output by the power amplification module, and transmitting a predistortion signal which is equal to the noise in magnitude and opposite to the noise in direction while transmitting an uplink signal.
9. The control method according to claim 6,
the method further comprises the following steps: when the radio frequency transceiver sends an uplink signal, the downlink feedback signal is received through a downlink feedback channel, the power difference between the uplink feedback signal and the downlink feedback signal is calculated, when the difference between the power difference and the reference power is larger than a second preset threshold, an antenna tuner is adjusted and/or channel switching is carried out, so that the difference between the power difference and the reference power is smaller than the second preset threshold, or the power difference between the uplink feedback signal and the downlink feedback signal is calculated, a standing-wave ratio is calculated according to the power difference and the reference power, and if the standing-wave ratio is larger than a third preset threshold, the antenna tuner in an antenna module is adjusted and/or channel switching is carried out, so that the standing-wave ratio is smaller than the third preset threshold, and the downlink feedback signal is a reflected signal of the uplink signal.
10. A wireless communication device comprising a radio frequency system according to any of claims 1-5.
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