CN115051764A - System and method for WLAN11ax system transmit channel quality condition monitoring - Google Patents

System and method for WLAN11ax system transmit channel quality condition monitoring Download PDF

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CN115051764A
CN115051764A CN202210625631.7A CN202210625631A CN115051764A CN 115051764 A CN115051764 A CN 115051764A CN 202210625631 A CN202210625631 A CN 202210625631A CN 115051764 A CN115051764 A CN 115051764A
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wlan11ax
signal
quality condition
transmit channel
feedback
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CN115051764B (en
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王志奇
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Heng Xuan Technology Beijing Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters
    • H04B17/15—Performance testing
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

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  • Computer Networks & Wireless Communication (AREA)
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  • Quality & Reliability (AREA)
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Abstract

A system for transmission channel quality condition monitoring for a WLAN11ax system is provided that includes a transmitter and a processor. Wherein the transmitter transmits at least one sounding signal within a symbol corresponding to a PE of the PPDU via a transmission channel of the WLAN11ax system. The processor is configured to acquire a feedback signal associated with the PPDU using a feedback channel and obtain a quality condition of the transmit channel based on data associated with the at least one sounding signal in the feedback signal. By utilizing the system, the dynamic monitoring of the quality condition of the transmission channel can be realized by monitoring the distortion condition of the transmission signal.

Description

System and method for WLAN11ax system transmit channel quality condition monitoring
Technical Field
The present application relates to the field of wireless communications technologies, and more particularly, to a system and method for WLAN11ax system transmit channel quality condition monitoring.
Background
The actual parameters and characteristics of rf devices vary with temperature, aging, impedance, power supply, etc., and many times these parameters have changed. If the calibration parameters do not follow the variation, the quality of the transmitted signal will be degraded, which may cause interference to other users of the air interface, and reduce the throughput of the system. Therefore, it is necessary to monitor the quality of the transmitted rf signal.
It is common practice to restart the calibration once regularly, but this is likely to be corrected again long after the distortion has occurred. One is to introduce the signal transmitted from the radio frequency Power Amplifier (PA) to its own receiving path through a feeder for demodulation, and extract Error Vector Magnitude (EVM), etc., but this is expensive.
Disclosure of Invention
The present application is proposed to solve the above technical problems in the prior art. The system for monitoring the quality condition of the transmission channel of the WLAN11ax system is capable of rapidly monitoring various parameters of a transmission radio frequency signal with little cost on the basis of complying with a WLAN11ax protocol, and rapidly feeding the parameters back to a feedback end to remind a user of updating corresponding calibration.
A first aspect in accordance with the present application provides a system for transmission channel quality condition monitoring for a WLAN11ax system, the system comprising a transmitter and a processor. Wherein the transmitter is configured to transmit at least one sounding signal within a symbol corresponding to a PE of a PPDU via a transmit channel of the WLAN11ax system. The processor is configured to acquire a feedback signal associated with the PPDU using a feedback channel and obtain a quality condition of the transmit channel based on data associated with the at least one sounding signal in the feedback signal.
According to a second aspect of the present application, there is provided a method for quality condition monitoring of a transmission channel of a WLAN11ax system, the method comprising transmitting, based on a transmitter, at least one sounding signal within a symbol corresponding to a PE of a PPDU via the transmission channel of the WLAN11ax system, and acquiring, based on a processor, a feedback signal associated with the PPDU using a feedback channel, and acquiring a quality condition of the transmission channel based on data associated with the at least one sounding signal in the feedback signal.
A third aspect according to the present application provides a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, cause the processor to perform a method for WLAN11ax system transmit channel quality condition monitoring according to various embodiments of the present application.
Compared with the prior art, the beneficial effects of the embodiment of the application lie in that:
based on the WLAN11ax protocol, at least one probe is transmitted within symbols corresponding to PEs of the PPDU, and in response to the probe, the system generates a feedback signal corresponding to the probe. Based on data, such as signal strength, in the feedback signal associated with at least one detection signal, the quality status of the transmission channel is judged by comparing the signal strength, and corresponding calibration is performed. According to the system and the method provided by the embodiment of the application, a non-standard detection signal except for a protocol is not required to be additionally transmitted, and on the basis of complying with the WLAN11ax protocol framework, various parameters associated with the radio frequency transmission signal are conveniently measured at a small cost on the premise of not bringing unexpected interference to the existing protocol and signal, so that the real-time dynamic monitoring on the quality condition of the radio frequency transmission channel is realized.
The foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to limit the invention as claimed.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different examples of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments and, together with the description and the claims, serve to explain the disclosed embodiments. Such embodiments are illustrative and exemplary and are not intended to be exhaustive or exclusive embodiments of the present method, apparatus, system, or non-transitory computer-readable medium having instructions for implementing the method.
FIG. 1 shows a schematic block diagram of a system for WLAN11ax system transmit channel quality condition monitoring according to an embodiment of the present application;
fig. 2 shows a block diagram of a wireless transceiving system based on a WLAN11ax according to an embodiment of the present application;
fig. 3 shows a frequency spectrum diagram of a change in circuit characteristics of a transmit mixer due to IQ mismatch according to an embodiment of the present application;
fig. 4 shows a spectrum diagram when the non-linear characteristic of a power amplifier changes according to an embodiment of the application;
fig. 5 shows a spectrum diagram when compensation of the original frequency-dependent IQ mismatch due to circuit parameter changes cannot compensate the current FDIQ sufficiently well according to an embodiment of the present application;
FIG. 6 shows a graph of a spectrum for a power amplifier output power drop according to an embodiment of the application;
fig. 7 shows a flow chart of a method for quality condition monitoring of the transmit channel of a WLAN11ax system according to an embodiment of the application.
Detailed Description
In order to make the technical solutions of the present application better understood, the present application is described in detail below with reference to the accompanying drawings and the detailed description. The embodiments of the present application will be described in further detail below with reference to the drawings and specific embodiments, but the present application is not limited thereto.
As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In this application, when a particular device is described as being located between a first component and a second component, there may or may not be intervening devices between the particular device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other devices without intervening devices, or may be directly connected to the other devices with intervening devices. In the present application, arrows shown in the figures of the respective steps are only used as examples of execution sequences, and are not limited, and the technical solution of the present application is not limited to the execution sequences described in the embodiments, and the respective steps in the execution sequences may be executed in a combined manner, may be executed in a split manner, and may be in an order-changed manner as long as the logical relationship of the execution content is not affected.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
The system according to the embodiment of the application is suitable for a wireless transceiving system under the WLAN11ax protocol framework.
The system for monitoring the quality condition of the transmission channel of the WLAN11ax system according to the embodiment of the application can be realized by improving partial functions on the basis of the existing WLAN11ax system. A system for monitoring the quality status of the transmit channel of the WLAN11ax system according to an embodiment of the present application will be described in detail below with reference to fig. 1 and 2.
Fig. 1 shows a schematic block diagram of a system for monitoring the quality condition of a transmission channel of a WLAN11ax system according to an embodiment of the present application, and fig. 2 shows a structural block diagram of a wireless transceiving system based on the WLAN11ax according to an embodiment of the present application. As shown in fig. 1, a system 100 for WLAN11ax system transmit channel quality condition monitoring according to embodiments of the present application may include, for example, a transmitter 101 and a processor 102. The processor 102 may be a processing device, such as a microprocessor, Central Processing Unit (CPU), Graphics Processing Unit (GPU), etc., which may include one or more general purpose processing devices. More specifically, the processor 102 may be a Complex Instruction Set Computing (CISC) microprocessor, or microprocessorA simple instruction set computing (RISC) microprocessor, a Very Long Instruction Word (VLIW) microprocessor, a processor running other instruction sets, or a processor running a combination of instruction sets. Processor 102 may also be one or more special-purpose processing devices such as an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a Digital Signal Processor (DSP), a system on a chip (SoC), or the like. As will be appreciated by those skilled in the art, in some embodiments, the processor 102 may be a special purpose processor rather than a general purpose processor. Processor 102 may include one or more known processing devices, such as a microprocessor from the Pentium (TM), Core (TM), Xeon (TM) or Itanium (TM) family manufactured by Intel (TM), Turion (TM), Athlon (TM), Sempron (TM), Opteron (TM), FX (TM), Phenom (TM) family manufactured by AMD (TM), or various processors manufactured by Sun Microsystems. The processor 102 may also include a graphics processing unit, such as from
Figure BDA0003677225460000041
GPU of (1), manufactured by Nvidia TM
Figure BDA0003677225460000042
Figure BDA0003677225460000043
Series, GMA manufactured by Intel, Iris, or Radon, manufactured by AMD. Processor 102 may also include an accelerated processing unit, such as the Desktop A-4(6,6) family manufactured by AMD, the Xeon Phi (TM) family manufactured by Intel (TM). In addition, the term "processor" or "image processor" may include more than one processor, e.g., a multi-core design or multiple processors, each having a multi-core design. The processor 102 may execute sequences of computer program instructions stored in the memory to perform the various operations, processes, and methods disclosed herein.
Fig. 2 shows a block diagram of a wireless transceiving system based on a WLAN11ax system according to an embodiment of the present application, and as shown in fig. 2, a wireless transceiving system 200 based on a WLAN11ax may include a transmitting channel 201 and a feedback channel 209. The transmit channel 201 may in turn include a baseband transmission 201a, a DAC (digital-to-analog converter) 202, a first ALPF (analog baseband low pass filter) 203, a transmit mixer (Tx mixer) 204, a PA (power amplifier) 205, and a transmit antenna 205'. The feedback path 209 may in turn include a signal coupler (radio frequency signal coupler) 206', a receive mixer (Rx mixer) 206, a second ALPF 207, an ADC (analog-to-digital converter) 208, and baseband receive and processing 209 a. The baseband transmission 201a may integrate the functions of the transmitter 101 shown in fig. 1 according to the embodiment of the present application on the basis of the original baseband transmission function based on the WLAN11ax protocol, that is, in the baseband signal output by the baseband transmission 201a, at least one sounding signal is included in a symbol corresponding to a PE of the PPDU. In other embodiments, the original WLAN11ax baseband transmission function may be integrated by the transmitter 101, but the present application is not limited thereto.
As shown in fig. 2, a digital baseband signal transmitted by the transmitter 101 (through a baseband transmitter 201a) is converted into an analog baseband signal by the DAC 202, and then passes through an analog baseband low-pass filter and a first ALPF203 (for example, a Butterworth filter) to filter out-of-band interference and noise, and then passes through a transmit mixer 204 to shift the signal to a radio frequency, and then is input to the power amplifier PA205 and transmitted.
At the signal feedback end (not shown), the signal receiving process is the inverse process as described above, and the signal received from the antenna passes through a band pass filter (not shown) and is sent to the receiving mixer 206, so that the signal is shifted to the baseband or low intermediate frequency, and then passes through an analog baseband filter (not shown) to filter out-of-band signals and noise, and the signal is converted to the digital baseband by an analog-to-digital converter (ADC 208) and then is subjected to corresponding digital processing.
In some embodiments, the feedback channel 209 shown in fig. 2 may be used as an analog of a signal receiving process performed on the signal feedback end, specifically, a transmission signal output by the PA205 may be coupled into the feedback channel 209 through the signal coupler 206', and then sequentially subjected to mixing by the receiving mixer 206, low-pass filtering by the second ALPF 207, conversion by the ADC 208 into a digital signal, and then subjected to signal demodulation by the baseband receiving and processing 209a, so as to perform various functions and operations of the processor 102 shown in fig. 1 according to an embodiment of the present application. Hereinafter, the original functions of the components in the transmission channel 201 and the feedback channel 209 are not repeated, and the specific functions and configurations of the transmitter 101 and the processor 102 in the system for monitoring the quality status of the transmission channel 201 of the WLAN11ax system (i.e. the wireless transceiving system 200 based on the WLAN11 ax) according to the embodiment of the present application are mainly described.
The transmitter 101 may be, for example, a router. For example, the sending of at least one probing signal within a symbol corresponding to a PE of a PPDU via a transmission channel of the WLAN11ax system may be performed by a router.
WIFI6(WLAN 11ax), taking into account the difference of processing capability for different stas (station), the Protocol introduces pe (packet extension), that is, introduces time domain waveform with length {0us,4us,8us,12us,16us } at the end of each PPDU (Presentation Protocol Data Unit) to reserve sufficient Data processing time for the feedback end. The PE waveform is required to have the same power as the previous data portion so that its spectrum does not leak out of band, and the specific content being transmitted is not required. The PPDU is the format of a presentation layer packet in OSI, and the leftmost field is preferentially transmitted and received in a PPDU packet structure. In a field of a plurality of bytes, the least significant byte is preferentially transmitted or received, and the Least Significant Bit (LSB) is preferentially transmitted in each byte, and similarly, the transmission of a data field between the presentation layer and the MAC layer follows this rule.
The probing signal may be a single-frequency complex sinusoidal signal (also referred to as a single-frequency tone), or other spectrally simpler signal. Based on the WLAN11ax protocol, the transmitter 101 sends one or more sounding signals in the symbols corresponding to the PEs of the PPDU, so as to monitor the quality condition of the transmission channel through the measurement of the transmission signals. The transmitter 101 schedules the sending of the probe signal based on the link condition, for example, the transmitter 101 may send the probe signal at regular intervals, or after obtaining the quality status of the whole transmission channel, determine a specific time for sending the probe signal based on the specific quality status of the transmission channel, or send the probe signal in other feasible manners, which is not limited in this application. Because the sending time and the sending mode of the detection signal are in the WLAN11ax protocol frame, extra time is not needed to be occupied for sending non-standard signals and the like, the adverse effects such as interference and the like on a normally running protocol and network communication are avoided, and the real-time monitoring of the quality condition of a transmitting channel can be realized at a lower cost.
In some embodiments, the processor 102 may be configured to acquire a feedback signal associated with the PPDU using a feedback channel and obtain a quality status of the transmit channel based on data associated with the at least one sounding signal in the feedback signal. In response to the probe signal transmitted by the transmitter 101, feedback information corresponding to the probe signal will appear in the spectrum, for example, the feedback information may be mirror image information, feedback information at different frequency positions, third order intermodulation information or other response information. In some embodiments, the manner in which the sounding signal is transmitted in the PPDU may be selected according to the specific parameters of the transmission channel intended to be monitored, and the monitoring of the quality condition of the transmission channel corresponding to the specific parameters may be achieved through measurement of the associated feedback signal. For example, distortion of the transmitted signal may result when the non-linear characteristics of the power amplifier PA205 change, and in response to the distortion, third order intermodulation of significant intensity may occur in the PPDU associated feedback signal. At this time, it may be determined whether the link needs to be calibrated for the non-linear characteristic of the power amplifier PA205 based on data associated with the at least one probe signal in the feedback signal, such as the strength of the third-order intermodulation signal in the above-described embodiment, and a parameter for calibrating the link and the like may be determined by comparing the degree of the above-described strength change (e.g., deviation from a preset normal value and the like).
In some embodiments, IQ mismatch may result when the IQ mixed carrier signals on the transmit path 201 are no longer exactly matched. The IQ mismatch may include, for example, frequency-independent IQ mismatch (or frequency-flat IQ mismatch) and frequency-dependent IQ mismatch (or frequency-selective IQ mismatch). The frequency-independent IQ mismatch is caused by the undesirable phase deviation (the phase deviation is not exactly 90 degrees) and the unmatched amplitude gain (the gains are not exactly equal) of the IQ branches in Local Oscillators (LOs) of the transmitter and the receiver. Such IQ mismatch parameters are not frequency dependent, i.e. each subcarrier in an OFDM symbol suffers the same IQ mismatch. For example, if the IQ two carriers of the transmit mixer 204 in fig. 2 are not strictly orthogonal, frequency-independent IQ mismatch and DC component (specifically, the carrier component leaking from the LO to the transmitter) are introduced into the rf signal output from the mixer, the former will generate the image signal, and the latter will generate extra carrier power. Frequency-dependent IQ mismatch occurs when there is mismatch in the other devices of the in-phase and quadrature branches (e.g., the first ALPF203, DAC 202, etc.). In addition, the Digital Predistorter (DPD) used for nonlinear correction of the power amplifier PA205 may also be distorted, especially for high peak-to-average ratio (PAPR) signals, which is particularly significant. However, the inventors of the present application found that these parameters and distortions associated with the quality condition of the transmission channel are estimated and compensated in the initial calibration stage of link establishment, and remain unchanged during the subsequent data transmission process, and are not adjusted any more, however, with the changes of the operating environment, the aging of the device, the power supply changes, and other factors, the calibrated rf parameters may also change accordingly, resulting in deviation from the expected parameters, and the quality condition of the transmission channel may not be accurately evaluated, which may affect the quality of data transmission in the link. Therefore, according to the embodiments of the present application, the feedback terminal is prompted to perform operations such as calibration and compensation again by detecting the above-mentioned frequency-independent/frequency-dependent IQ mismatch, DC offset, DPD mismatch, FDIQ mismatch, output power calibration, and other non-linearities and mismatches. Specifically, in the embodiment described in this application, at least one probe signal is sent in a symbol corresponding to a PE of a PPDU, and the processor 102 acquires a feedback signal in response to the probe signal by using the feedback channel 209, and obtains the quality status of the transmission channel 201 by comparing the strength of a relevant spectrum in the feedback signal. The processor 102 sends the acquired quality status of the transmission channel 201 to a feedback end (not shown) of the WLAN11ax system, and the feedback end calibrates a link of the WLAN11ax system based on the quality status of the transmission channel 201, so as to dynamically monitor the transmission channel 201 of the wireless transceiving system 200, so that the feedback end calibrates corresponding components and parameters thereof in the transmission channel 201 according to the received quality status, thereby ensuring that a transmission signal is accurate and distortion-free, and improving data transmission quality and transmission efficiency of the wireless transceiving system 200.
In some embodiments, the at least one probing signal comprises a single frequency tone or a plurality of single frequency tones with different frequencies, so as to obtain a feedback signal in the frequency spectrum, which can significantly reflect the quality status of the transmission channel 201. Obtaining the quality status of the transmission channel 201 based on the data associated with the at least one probe signal in the feedback signal, so that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality status of the transmission channel specifically includes obtaining the quality status of the transmission channel 201 based on the spectrum data associated with the single frequency tone or the multiple single frequency tones of different frequencies in the feedback signal, so that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality status of the transmission channel. Therefore, the accuracy of dynamically monitoring the quality condition of the transmission channel 201 is improved, so that the feedback end of the WLAN11ax system can adjust the relevant parameters of the WLAN11ax system to calibrate the link. The determination method specifically regarding the quality status includes, but is not limited to, the following manner.
In some embodiments, the quality condition of the transmission channel 201 includes IQ mismatch, and the obtaining the quality condition of the transmission channel based on the spectrum data associated with the single frequency tone or the multiple single frequency tones of different frequencies in the feedback signal, so that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmission channel specifically includes the processor 102 determining that the at least one probing channel is IQ mismatchAnd under the condition that the deviation of the signal strength of the first single-frequency tone at the mirror frequency of the first single-frequency tone in the signals relative to the signal strength of the first single-frequency tone is larger than a first threshold value, enabling the feedback end of the WLAN11ax system to carry out IQ calibration on the WLAN11ax system again. Specifically, to send an f in the corresponding symbol of PE 0 For example, as shown in fig. 3, the frequency spectrum diagram of the transmitting mixer according to the embodiment of the present application, which varies due to IQ mismatch, has an internal transmission frequency f in the PE coincidence 0 A tone (single frequency point complex sinusoidal signal) corresponding in frequency spectrum to generate a frequency of-f 0 Which may be due to variations in the IQ mismatch characteristics of the transmit mixer 204, the IQ mismatch compensation on the original transmit path may not be matched well enough. The processor 102 obtains the signal at the image frequency-f by analyzing the spectrum of the baseband receive and process 209a 0 Signal strength at and at f 0 The signal strength of (f) and is obtained at the image frequency-f 0 Signal strength at f 0 If the ratio is higher than the first threshold, it indicates that the IQ calibration is required. The first threshold may be set manually, or may be set in the factory, and is not particularly limited. For example, when the first threshold is 0.001, if the ratio is higher than 0.001, the controller is prompted to perform IQ calibration.
In some implementations, the quality condition of the transmit channel 201 further includes a DC offset, and the obtaining the quality condition of the transmit channel 201 based on the spectrum data associated with the single frequency tone or the multiple different frequency single frequency tones in the feedback signal, so that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmit channel specifically includes, by the processor 102, when it is determined that the at least one probe signal includes one single frequency tone, and when the deviation of the DC signal strength at zero frequency from the signal strength of the single frequency tone is greater than a second threshold value, causing the feedback end of the WLAN11ax system to re-DC calibrate the WLAN11ax system. Specifically, to send an f in the corresponding symbol of PE 0 Is not only a sheetFor example, as shown in fig. 3, the frequency of the intra-symbol transmission corresponding to PE is f 0 The tone (single-frequency-point complex signal) of (a) is visible at zero frequency DC on the spectrum, which may be due to a change in the circuit characteristics of the transmit mixer 204 to which the original originating DC compensation is not matched well enough. The processor 102 obtains the signal strength at zero frequency and at f by analyzing the spectrum of the baseband receive and process 209a 0 The signal strength of (f) and the signal strength at zero frequency and at f are obtained 0 If the ratio is above a second threshold, indicating that a DC calibration is required. The second threshold may be set manually, or may be set in the factory, and is not particularly limited. For example, when the second threshold is 0.001, if the ratio is higher than 0.001, the feedback end is prompted to perform DC calibration.
In some implementations, the quality condition of the transmission channel 201 includes DPD mismatch, and the obtaining the quality condition of the transmission channel 201 based on the spectrum data associated with the single frequency tones of the multiple different frequencies in the feedback signal, so that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmission channel specifically includes, by the processor 102, when it is determined that the at least one probing signal includes at least two single frequency tones and a deviation of a representative value of third-order intermodulation signal strength between the at least two single frequency tones from a representative value of signal strengths of the at least two single frequency tones is greater than a third threshold, causing the feedback end of the WLAN11ax system to perform DPD calibration again on the WLAN11ax system. Specifically, taking the example of transmitting two single-frequency tones in the symbol corresponding to the PE, as shown in the spectrum diagram of fig. 4 when the non-linear characteristic of the power amplifier changes according to the embodiment of the present application, the signal is transmitted in the symbol corresponding to the PE at f 1 、f 2 Tone at frequency, responsive to tone at f 1 、f 2 Single frequency tone at frequency, producing third order intermodulation (IM3) in the feedback signal, the third order intermodulation IM3 being at 2f, respectively 1 -f 2 At frequency and 2f 2 -f 1 Frequency ofThis may be the case because the nonlinear characteristics of the power amplifier PA205 change and the original Digital Predistorter (DPD) does not match it well enough. The processor 102 obtains the spectrum at 2f by analyzing the spectrum of the baseband receive and process 209a 1 -f 2 At frequency or 2f 2 -f 1 Signal strength at frequency and at f 2 Or f 1 Signal strength at frequency and taken at 2f 1 -f 2 At frequency and 2f 2 -f 1 Signal at frequency and f 1 And f 2 The ratio of the signal strengths of (a) and (b). If the ratio is higher than the third threshold, it indicates that DPD calibration is required. The third threshold may be set manually, or may be set in the factory, and is not particularly limited. For example, when the third threshold is 0.002, if the ratio is higher than 0.002, the feedback end is prompted to perform DPD calibration.
In some implementations, when the quality condition of the transmission channel 201 includes FDIQ (frequency dependent IQ mismatch) mismatch, obtaining the quality condition of the transmission channel 201 based on the spectrum data associated with the single frequency tone or the multiple single frequency tones of different frequencies in the feedback signal, so that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmission channel specifically includes, by the processor 102, making the feedback end of the WLAN11ax system perform FDIQ calibration on the WLAN11ax system in a case that the at least one probe signal includes two or more single frequency tones and a deviation of a maximum value from a minimum value of respective signal strengths of the respective single frequency tones at respective mirror frequencies of the at least one probe signal is greater than a fourth threshold value. Specifically, taking the example of transmitting four single-frequency tones in the symbol corresponding to the PE, as shown in fig. 5, the frequency of transmitting in the symbol corresponding to the PE is f 0 、f 1 、f 2 、f 3 Of the four single-frequency tones, at their respective mirror frequency positions, i.e., -f 0 、-f 1 、-f 2 、-f 3 With a corresponding feedback signal at frequency. This may be the case due to a change in circuit parametersFrequency dependent IQ mismatch (frequency dependent IQ mismatch) compensation does not compensate the current FDIQ sufficiently well. The processor 102 obtains the spectrum at-f by analyzing the spectrum received and processed 209a at baseband 3 Intensity of signal at frequency and location at-f 0 The ratio of the signal strength at the frequencies, if the ratio is above a fourth threshold, indicates that FDIQ calibration is required. The fourth threshold may be set manually, or may be set in the factory, and is not particularly limited. For example, when the fourth threshold is 0.002, if the ratio is higher than 0.002, the feedback terminal is prompted to perform FDIQ calibration.
In some implementations, when the quality condition of the transmission channel 201 includes PA output power variation, obtaining the quality condition of the transmission channel based on the spectrum data associated with the single-frequency tone in the feedback signal, so that the feedback end of the WLAN11ax system calibrates the link of the WLAN11ax system based on the quality condition of the transmission channel specifically includes, by the processor 102, when it is determined that the at least one probing signal includes a single-frequency tone, obtaining an initial power of the single-frequency tone in an initial calibration phase and a probing power in a probing phase, where the initial power and the probing power are located at the same frequency, and a deviation of the probing power from the initial power is smaller than a fifth threshold or higher than a sixth threshold, so that the feedback end of the WLAN11ax system calibrates the output power of the WLAN11ax system, the initial power and the probing power are located at the same frequency, and the single-frequency tone when acquiring the initial power is not transmitted in the symbol corresponding to the PE of the PPDU, and the single-frequency tone when acquiring the probing power is transmitted in the symbol corresponding to the PE of the PPDU. Specifically, take an example of sending a single tone in a symbol corresponding to a PE. As shown in FIG. 6, during the initial calibration phase, a frequency f is transmitted from the transmission channel 201 0 The processor 102 obtains f by analyzing the frequency spectrum of the baseband reception and processing 209a 0 The initial power of (A) is P 0 . In the detection phase, when a PPDU packet with a PE is sent, a frequency f is sent out in a symbol corresponding to the PE 0 Single frequency tone detects the signal, and the processor 102 obtains f by analyzing the frequency spectrum of the baseband reception and processing 209a 0 The probe power at is P1. Assuming that the fifth threshold is 0.9 and the sixth threshold is 1.1, if the ratio of P1/P0 is less than 0.9 or greater than 1.1, the deviation of the actual output power of the surface is large, indicating that the output power calibration needs to be performed again.
Fig. 7 shows a flow chart of a method for quality condition monitoring of the transmit channel of a WLAN11ax system according to an embodiment of the application. In step 701, at least one sounding signal is transmitted within a symbol corresponding to a PE of a PPDU via a transmission channel of the WLAN11ax system based on a transmitter. In step 702, a feedback signal associated with the PPDU is acquired using a feedback channel based on a processor. In step 703, based on the data associated with the at least one probe signal in the feedback signal, the quality status of the transmission channel is obtained, so that on the basis of complying with the WLAN11ax protocol, multiple parameters of the transmitted radio frequency signal are quickly monitored with little cost, and are quickly fed back to the feedback end to prompt updating of the corresponding calibration.
In some embodiments, the at least one probing signal includes a single frequency tone or a plurality of single frequency tones of different frequencies, so as to obtain a feedback signal in the frequency spectrum, which can significantly reflect the quality status of the transmission channel 201. Specifically, the obtaining, by the processor, the quality status of the transmission channel based on the spectrum data associated with the single frequency tone or the multiple single frequency tones of different frequencies in the feedback signal, so that the feedback end of the WLAN11ax system calibrates the link of the WLAN11ax system based on the quality status of the transmission channel, and the obtaining, by the processor, the quality status of the transmission channel based on the spectrum data associated with the single frequency tone or the multiple single frequency tones of different frequencies in the feedback signal, so that the feedback end of the WLAN11ax system calibrates the link of the WLAN11ax system based on the quality status of the transmission channel. Therefore, the accuracy in dynamically monitoring the quality condition of the transmission channel 201 is improved, so that the feedback end of the WLAN11ax system can adjust the relevant parameters of the WLAN11ax system to calibrate the link. In some embodiments, the quality condition of the transmission channel includes IQ mismatch, and the obtaining the quality condition of the transmission channel based on the spectrum data associated with the single frequency tone or the single frequency tones of the multiple different frequencies in the feedback signal, so that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmission channel specifically includes, in a case that it is determined that a deviation of a signal strength at a mirror frequency of a first single frequency tone in the at least one probe signal from a signal strength of the first single frequency tone is greater than a first threshold, causing the feedback end of the WLAN11ax system to perform IQ calibration on the WLAN11ax system by the processor.
In some embodiments, the quality condition of the transmission channel includes a DC offset, and the obtaining the quality condition of the transmission channel based on the spectrum data associated with the single frequency tone or the single frequency tones of the plurality of different frequencies in the feedback signal, so that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmission channel specifically includes, by the processor, determining that the at least one probe signal includes one single frequency tone, and in a case that a deviation of a DC signal strength at a zero frequency from a signal strength of the single frequency tone is greater than a second threshold, causing the feedback end of the WLAN11ax system to DC calibrate the WLAN11ax system.
In some embodiments, the quality status of the transmission channel includes DPD mismatch, and the obtaining the quality status of the transmission channel based on the spectrum data associated with the multiple single-frequency tones of different frequencies in the feedback signal, so that the calibrating, by the feedback end of the WLAN11ax system, the link of the WLAN11ax system based on the quality status of the transmission channel specifically includes, when it is determined that the at least one probing signal includes at least two single-frequency tones, and a deviation of a representative value of third-order intermodulation signal strengths between the at least two single-frequency tones from a representative value of the signal strengths of the at least two single-frequency tones is greater than a third threshold, causing the feedback end of the WLAN11ax system to perform DPD calibration on the WLAN11ax system.
In some embodiments, the quality condition of the transmission channel includes FDIQ mismatch, and the obtaining the quality condition of the transmission channel based on the spectrum data associated with the single frequency tone or multiple single frequency tones of different frequencies in the feedback signal, so that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmission channel specifically includes, by the processor, making the feedback end of the WLAN11ax system perform FDIQ calibration on the WLAN11ax system when it is determined that the at least one probe signal includes two or more single frequency tones and a deviation of a maximum value from a minimum value in respective signal strengths of the respective single frequency tones at respective mirror frequencies in the at least one probe signal is greater than a fourth threshold.
In some embodiments, the quality condition of the transmit channel includes PA output power variation, and the obtaining the quality condition of the transmit channel based on the spectrum data associated with the single frequency tone in the feedback signal, such that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmit channel specifically includes, by the processor: when the at least one detection signal comprises a single-frequency tone, acquiring initial power of the single-frequency tone in an initial calibration stage and detection power of the single-frequency tone in a detection stage, and enabling a feedback end of the WLAN11ax system to calibrate output power of the WLAN11ax system under the condition that the deviation of the detection power and the initial power is smaller than a fifth threshold value or higher than a sixth threshold value; the initial power and the probing power are located at the same frequency, and the single-frequency tone when acquiring the initial power is not transmitted in the symbol corresponding to the PE of the PPDU, and the single-frequency tone when acquiring the probing power is transmitted in the symbol corresponding to the PE of the PPDU.
The present application describes various operations or functions that may be implemented as or defined as software code or instructions. Such content may be source code or differential code ("delta" or "patch" code) ("object" or "executable" form) that may be executed directly. The software code or instructions may be stored in a computer-readable storage medium and, when executed, may cause a machine to perform the functions or operations described, and includes any mechanism for storing information in a form accessible by a machine (e.g., a computing device, an electronic system, etc.), such as recordable or non-recordable media (e.g., Read Only Memory (ROM), Random Access Memory (RAM), magnetic disk storage media, optical storage media, flash memory devices, etc.).
The example methods described herein may be implemented at least in part by a machine or computer. In some embodiments, a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, cause the processor to perform a method for WLAN11ax system transmit channel quality condition monitoring according to various embodiments of the present application. An implementation of such a method may include software code, such as microcode, assembly language code, a high-level language code, and so forth. Various software programming techniques may be used to create the various programs or program modules. For example, the program parts or program modules may be designed in or by Java, Python, C + +, assembly language, or any known programming language. One or more of such software portions or modules may be integrated into a computer system and/or computer-readable medium. Such software code may include computer readable instructions for performing various methods. The software code may form part of a computer program product or a computer program module. Further, in an example, the software code can be tangibly stored on one or more volatile, non-transitory, or non-volatile tangible computer-readable media, e.g., during execution or at other times. Examples of such tangible computer-readable media may include, but are not limited to, hard disks, removable magnetic disks, removable optical disks (e.g., compact disks and digital video disks), magnetic cassettes, memory cards or sticks, Random Access Memories (RAMs), Read Only Memories (ROMs), and the like.
The method, apparatus, and system of the present application are subject to various modifications and variations. Other embodiments may be devised by those skilled in the art in view of the description and practice of the disclosed systems and related methods. The individual claims of the present application can be understood as separate embodiments and any combination between them also serves as an embodiment of the present application and these embodiments are considered to be included in the present application.
The examples are to be considered as illustrative only, with a true scope being indicated by the following claims and their equivalents.

Claims (16)

1. A system for WLAN11ax system transmit channel quality condition monitoring, the system comprising:
a transmitter configured to transmit at least one sounding signal within a symbol corresponding to a PE of a PPDU via a transmit channel of the WLAN11ax system; and
a processor configured to acquire a feedback signal associated with the PPDU using a feedback channel; and is
And acquiring the quality condition of the transmitting channel based on the data associated with the at least one detection signal in the feedback signal.
2. The system of claim 1, wherein the at least one probing signal comprises a single frequency tone or a plurality of different single frequency tones, and wherein obtaining the quality status of the transmit channel based on data associated with the at least one probing signal in the feedback signal, such that calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality status of the transmit channel comprises, by the processor:
obtaining the quality condition of the transmission channel based on the spectrum data associated with the single frequency tone or the multiple single frequency tones with different frequencies in the feedback signal, so that the feedback end of the WLAN11ax system calibrates the link of the WLAN11ax system based on the quality condition of the transmission channel.
3. The system of claim 2, wherein the quality condition of the transmit channel comprises IQ mismatch, and wherein obtaining the quality condition of the transmit channel based on the spectral data in the feedback signal associated with the one single frequency tone or multiple different frequency single frequency tones, such that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmit channel comprises, in particular, by the processor:
and under the condition that the deviation of the signal strength at the mirror frequency of a first single-frequency tone in the at least one detection signal relative to the signal strength of the first single-frequency tone is judged to be larger than a first threshold value, enabling the feedback end of the WLAN11ax system to carry out IQ calibration on the WLAN11ax system.
4. The system of claim 2, wherein the quality condition of the transmit channel comprises a DC offset, and wherein obtaining the quality condition of the transmit channel based on the spectral data in the feedback signal associated with the one single frequency tone or the plurality of different single frequency tones, such that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmit channel comprises, in particular, by the processor:
and under the condition that the at least one detection signal comprises a single frequency tone and the deviation of the DC signal strength at the zero frequency relative to the signal strength of the single frequency tone is larger than a second threshold value, enabling the feedback end of the WLAN11ax system to carry out DC calibration on the WLAN11ax system.
5. The system of claim 2, wherein the quality condition of the transmit channel comprises DPD mismatch, and wherein obtaining the quality condition of the transmit channel based on the spectrum data in the feedback signal associated with the plurality of single frequency tones of different frequencies, such that calibrating the link of the WLAN11ax system based on the quality condition of the transmit channel by the feedback end of the WLAN11ax system specifically comprises, by the processor:
and under the condition that the at least one detection signal is judged to comprise at least two single frequency tones, and the deviation of the representative value of the third-order inter-modulation signal intensity between the at least two single frequency tones relative to the representative value of the signal intensity of the at least two single frequency tones is larger than a third threshold value, enabling the feedback end of the WLAN11ax system to perform DPD calibration on the WLAN11ax system.
6. The system of claim 2, wherein when the quality condition of the transmit channel comprises FDIQ mismatch, obtaining the quality condition of the transmit channel based on the spectral data in the feedback signal associated with the one single-frequency tone or the plurality of different single-frequency tones, such that the feedback end of the WLAN11ax system calibrating the link of the WLAN11ax system based on the quality condition of the transmit channel specifically comprises, by the processor:
and under the condition that the at least one detection signal comprises more than two single-frequency tones and the deviation of the maximum value relative to the minimum value of the signal intensity of each single-frequency tone at the respective mirror frequency in the at least one detection signal is larger than a fourth threshold value, carrying out FDIQ calibration on the WLAN11ax system by the feedback end of the WLAN11ax system.
7. The system of claim 2, wherein when the quality condition of the transmit channel comprises a PA output power variation, obtaining the quality condition of the transmit channel based on the spectral data associated with the one single frequency tone in the feedback signal, such that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmit channel specifically comprises, by the processor:
when the at least one detection signal comprises a single-frequency tone, acquiring initial power of the single-frequency tone in an initial calibration stage and detection power of the single-frequency tone in a detection stage, and enabling a feedback end of the WLAN11ax system to calibrate output power of the WLAN11ax system under the condition that the deviation of the detection power and the initial power is smaller than a fifth threshold value or higher than a sixth threshold value; the initial power and the probing power are located at the same frequency, and the single-frequency tone when acquiring the initial power is not transmitted in the symbol corresponding to the PE of the PPDU, and the single-frequency tone when acquiring the probing power is transmitted in the symbol corresponding to the PE of the PPDU.
8. The system of any of claims 3-7, wherein the deviation comprises a ratio.
9. A method for WLAN11ax system transmit channel quality condition monitoring, comprising:
based on a transmitter, transmitting at least one sounding signal within a symbol corresponding to a PE of a PPDU via a transmission channel of the WLAN11ax system; and
acquiring, based on a processor, a feedback signal associated with the PPDU using a feedback channel; and is
And acquiring the quality condition of the transmitting channel based on the data associated with the at least one detection signal in the feedback signal.
10. The method of claim 9, wherein the at least one probe signal comprises a single frequency tone or a plurality of different single frequency tones, and wherein obtaining the quality status of the transmit channel based on data associated with the at least one probe signal in the feedback signal, such that the feedback end of the WLAN11ax system calibrates the link of the WLAN11ax system based on the quality status of the transmit channel comprises, by the processor:
obtaining a quality status of the transmission channel based on spectrum data associated with the single-frequency tone or the multiple single-frequency tones of different frequencies in the feedback signal, so that the feedback end of the WLAN11ax system calibrates the link of the WLAN11ax system based on the quality status of the transmission channel.
11. The method of claim 9, wherein the quality condition of the transmit channel comprises IQ mismatch, and wherein obtaining the quality condition of the transmit channel based on the spectral data in the feedback signal associated with the one single frequency tone or multiple different single frequency tones, such that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmit channel specifically comprises, by the processor:
and under the condition that the deviation of the signal strength at the mirror frequency of a first single-frequency tone in the at least one detection signal relative to the signal strength of the first single-frequency tone is judged to be larger than a first threshold value, enabling the feedback end of the WLAN11ax system to carry out IQ calibration on the WLAN11ax system.
12. The method of claim 9, wherein the quality condition of the transmit channel comprises a DC offset, and wherein obtaining the quality condition of the transmit channel based on the spectral data in the feedback signal associated with the one single frequency tone or the plurality of different single frequency tones, such that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmit channel comprises, in particular, by the processor:
and under the condition that the at least one detection signal comprises a single frequency tone and the deviation of the DC signal strength at the zero frequency relative to the signal strength of the single frequency tone is larger than a second threshold value, enabling the feedback end of the WLAN11ax system to carry out DC calibration on the WLAN11ax system.
13. The method of claim 9, wherein the quality condition of the transmit channel comprises DPD mismatch, and wherein obtaining the quality condition of the transmit channel based on the spectrum data associated with the single frequency tones of the plurality of different frequencies in the feedback signal such that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmit channel specifically comprises, by the processor:
and under the condition that the at least one detection signal is judged to comprise at least two single frequency tones, and the deviation of the representative value of the third-order inter-modulation signal intensity between the at least two single frequency tones relative to the representative value of the signal intensity of the at least two single frequency tones is larger than a third threshold value, enabling the feedback end of the WLAN11ax system to perform DPD calibration on the WLAN11ax system.
14. The method of claim 9, wherein when the quality condition of the transmit channel comprises FDIQ mismatch, obtaining the quality condition of the transmit channel based on the spectral data in the feedback signal associated with the one single frequency tone or multiple different single frequency tones, such that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmit channel specifically comprises, by the processor:
and under the condition that the at least one detection signal comprises more than two single-frequency tones and the deviation of the maximum value relative to the minimum value of the signal intensity of each single-frequency tone at the respective mirror frequency in the at least one detection signal is larger than a fourth threshold value, carrying out FDIQ calibration on the WLAN11ax system by the feedback end of the WLAN11ax system.
15. The method of claim 9, wherein when the quality condition of the transmit channel comprises PA output power variation, obtaining the quality condition of the transmit channel based on the spectrum data associated with the one single frequency tone in the feedback signal, such that the calibrating the link of the WLAN11ax system by the feedback end of the WLAN11ax system based on the quality condition of the transmit channel specifically comprises, by the processor:
when the at least one detection signal comprises a single-frequency tone, acquiring initial power of the single-frequency tone in an initial calibration stage and detection power of the single-frequency tone in a detection stage, and enabling a feedback end of the WLAN11ax system to calibrate output power of the WLAN11ax system under the condition that the deviation of the detection power and the initial power is smaller than a fifth threshold value or higher than a sixth threshold value; the initial power and the probing power are located at the same frequency, and the single-frequency tone when acquiring the initial power is not transmitted in the symbol corresponding to the PE of the PPDU, and the single-frequency tone when acquiring the probing power is transmitted in the symbol corresponding to the PE of the PPDU.
16. A computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, cause the processor to perform the method for WLAN11ax system transmit channel quality condition monitoring as claimed in any of claims 9-15.
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