WO2021087707A1

WO2021087707A1 - Dual-frequency-band multi-frequency-point adaptive channel estimation method and apparatus, and storage medium

Info

Publication number: WO2021087707A1
Application number: PCT/CN2019/115459
Authority: WO
Inventors: 戴劲; 张志鹏
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2021-05-14
Also published as: CN111886836A

Abstract

A dual-frequency-band multi-frequency-point adaptive channel estimation method and apparatus, and a storage medium. The method comprises: during the process of receiving/sending an image transmission signal at a first working frequency band, estimating the channel quality of the first working frequency band on the basis of the image transmission signal obtained by means of the receiving/sending (S101); sending, in a time share manner, an uplink data packet at different frequency points of a second working frequency band to estimate the channel quality of the second working frequency band (S102); and when the channel quality of the first working frequency band does not satisfy a preset condition, determining, according to the channel quality of the second working frequency band, whether to use the second working frequency band to receive/send the image transmission signal (S103).

Description

Dual-band multi-frequency point adaptive channel estimation method, device and storage medium

Technical field

This application relates to the field of communication technology, and in particular to a dual-band multi-frequency point adaptive channel estimation method, device and storage medium.

Background technique

The communication distance between the unmanned aerial vehicle and the remote controller is the core problem that needs to be solved in the image transmission of the unmanned aerial vehicle. After supporting dual-frequency communication, switching between different frequency bands through an adaptive algorithm can avoid interference and improve communication quality.

The existing transceiver supports two frequency bands, and only one of the working frequency bands is selected as the frequency band for working communication transmission and reception, and the other frequency bands are idle frequency bands. Existing algorithms generally use interference detection to achieve frequency band selection. However, when performing frequency band selection, the existing method cannot obtain the accurate received power of the working frequency band and the received power of other idle frequency bands at the same time. The received power of other idle frequency bands are obtained through estimation, and the estimation has errors, which leads to inaccurate frequency band selection.

Summary of the invention

Based on this, the present application provides a dual-band multi-frequency adaptive channel estimation method, device and storage medium.

In the first aspect, this application provides a dual-band multi-frequency adaptive channel estimation method, including:

In the process of sending and receiving video transmission signals in the first working frequency band, estimating the channel quality of the first working frequency band based on the video transmission signals obtained by receiving and sending; and,

Time-sharing sending uplink data packets at different frequency points of the second working frequency band to estimate the channel quality of the second working frequency band;

When the channel quality of the first working frequency band does not meet the preset condition, determining whether to use the second working frequency band to send and receive image transmission signals according to the channel quality of the second working frequency band.

In the second aspect, this application provides a dual-band multi-frequency adaptive channel estimation method, including:

In the process of receiving and transmitting the image transmission signal in the first working frequency band, sending a first feedback signal for the peer end to estimate the channel quality of the first working frequency band;

In response, the opposite end receives downlink data packets at different frequency points of the second working frequency band in a time-sharing manner, and sends a second feedback signal for the opposite end to estimate the channel quality of the second working frequency band.

In a third aspect, the present application provides a dual-band multi-frequency adaptive channel estimation device, the device includes: a memory, a processor, and a communication circuit;

The communication circuit is used to send and receive video transmission signals in the first working frequency band; and in the process of sending and receiving video transmission signals in the first working frequency band, time-sharing sending uplink data packets at different frequency points of the second working frequency band;

The memory is used to store a computer program;

The processor is used to execute the computer program and when executing the computer program, implement the following steps:

Estimate the channel quality of the second working frequency band according to the uplink data packets sent at different frequency points of the second working frequency band in a time-sharing manner;

In a fourth aspect, the present application provides a dual-band multi-frequency adaptive channel estimation device, the device includes: a communication circuit;

The communication circuit is used for:

Send and receive video transmission signals in the first working frequency band;

In a fifth aspect, the present application provides a computer-readable storage medium that stores a computer program, and when the computer program is executed by a processor, the processor realizes the above-mentioned dual-band multiplexer. Frequency adaptive channel estimation method.

The embodiments of the application provide a dual-band multi-frequency adaptive channel estimation method, device, and storage medium. In the process of transmitting and receiving image transmission signals in the first working frequency band, the first working frequency is estimated based on the image transmission signals obtained by the transmission and reception. The channel quality of the frequency band; time-sharing sends uplink data packets at different frequency points of the second working frequency band to estimate the channel quality of the second working frequency band; when the channel quality of the first working frequency band does not meet the preset conditions, according to the second working frequency The channel quality of the frequency band determines whether to use the second working frequency band to send and receive video transmission signals. Since the image transmission signal is still being sent and received in the first working frequency band, normal working communication can be obtained without affecting the normal working frequency and accurate channel quality of the first working frequency band; and there is no objective basis to estimate the channel quality of the second working frequency band in the existing method. In contrast, since the uplink data packets are sent at different frequency points of the second working frequency band in a time-sharing manner during the process of sending and receiving video transmission signals in the first working frequency band to estimate the channel quality of the second working frequency band, this objective basis can be used to estimate the channel quality of the second working frequency band. At the same time, more accurate and objective channel quality of the second working frequency band is obtained. When the channel quality of the first working frequency band and the second working frequency band are relatively accurate, when the working frequency band needs to be selected, it can provide a powerful tool for accurately selecting the working frequency band. Support can provide strong support for improving communication quality and increasing communication distance.

It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the application.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following will briefly introduce the drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. Ordinary technicians can obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic flowchart of an embodiment of a dual-band multi-frequency adaptive channel estimation method according to the present application;

2 is a schematic flowchart of another embodiment of a dual-band multi-frequency adaptive channel estimation method according to the present application;

3 is a schematic flowchart of another embodiment of the dual-band multi-frequency adaptive channel estimation method according to the present application;

4 is a schematic diagram of a specific application of time-sharing transmission in the dual-band multi-frequency adaptive channel estimation method of the present application;

Fig. 5 is a schematic flowchart of another embodiment of the dual-band multi-frequency adaptive channel estimation method according to the present application;

FIG. 6 is a schematic structural diagram of an embodiment of a dual-band multi-frequency adaptive channel estimation device according to the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The flowchart shown in the drawings is only an example, and does not necessarily include all contents and operations/steps, nor does it have to be executed in the described order. For example, some operations/steps can also be decomposed, combined or partially combined, so the actual execution order may be changed according to actual conditions.

The unmanned aerial vehicle and the remote control support dual-frequency communication, and switch between different frequency bands through an adaptive algorithm, which can avoid interference and improve the quality of communication. Existing algorithms generally use interference detection to achieve frequency band selection. However, it is impossible to accurately obtain the received power of the working frequency band and the idle frequency band at the same time, resulting in inaccurate frequency band selection. In the embodiment of the present application, in the process of receiving and sending image transmission signals in the first working frequency band, the channel quality of the first working frequency band is estimated based on the image transmission signals obtained by receiving and sending; the uplink data is sent at different frequency points of the second working frequency band in a time-sharing manner. The package is used to estimate the channel quality of the second working frequency band; when the channel quality of the first working frequency band does not meet the preset condition, determine whether to use the second working frequency band to send and receive image transmission signals according to the channel quality of the second working frequency band. Since the image transmission signal is still being sent and received in the first working frequency band, normal working communication can be obtained without affecting the normal working frequency and accurate channel quality of the first working frequency band; and there is no objective basis to estimate the channel quality of the second working frequency band in the existing method. In contrast, since the uplink data packets are sent at different frequency points of the second working frequency band in a time-sharing manner during the process of sending and receiving video transmission signals in the first working frequency band to estimate the channel quality of the second working frequency band, this objective basis can be used to estimate the channel quality of the second working frequency band. At the same time, more accurate and objective channel quality of the second working frequency band is obtained. When the channel quality of the first working frequency band and the second working frequency band are relatively accurate, when the working frequency band needs to be selected, it can provide a powerful tool for accurately selecting the working frequency band. Support can provide strong support for improving communication quality and increasing communication distance.

Hereinafter, some embodiments of the present application will be described in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

The dual-band multi-frequency adaptive channel estimation method of the embodiment of the present application includes a method of actively initiating channel estimation (referred to as the active initiator method) in the process of transmitting and receiving image transmission signals in the first working frequency band and a method of passively cooperating with the active initiator to perform channel estimation. Method (referred to as passive mating end method). For the convenience of description and to facilitate a better understanding of the dual-band multi-frequency point adaptive channel estimation method according to the embodiment of the present application, the active initiator method and the passive partner method are combined for detailed description below.

It should be noted that although the active initiator method and the passive partner method are combined and explained together, the active initiator method and the passive partner method are independent of each other. The active initiator method is to accurately and objectively estimate the first working frequency band and the first operating frequency. 2. The channel quality of the working frequency band provides technical support for the accurate selection of the working frequency band; the passive cooperating terminal method also provides technical support for accurately and objectively estimating the channel quality of the first working frequency band and the second working frequency band, which is also for the accurate selection of the working frequency band. Provide technical support; when the active initiating terminal method and the passive cooperative terminal method are combined, the channel quality of the first working frequency band and the second working frequency band can be accurately and objectively estimated to provide technical support for accurately selecting the working frequency band.

1 to 3, FIG. 1 is a schematic flowchart of an embodiment of a dual-band multi-frequency adaptive channel estimation method according to the present application, and FIG. 2 is a flowchart of another embodiment of the dual-band multi-frequency adaptive channel estimation method according to the present application Schematic diagram, FIG. 3 is a schematic flowchart of another embodiment of the dual-band multi-frequency adaptive channel estimation method according to the present application. It should be noted that the method in Figure 1 is a method of actively initiating channel estimation during the process of sending and receiving image transmission signals in the first working frequency band (referred to as the active initiator method), and the method in Figure 2 is a method of sending and receiving image transmission signals in the first working frequency band. The method of passively cooperating with the active initiator in the process of channel estimation (referred to as the passive coordinating end method), the method in Figure 3 is a method of combining the active initiator and passive coordinating end methods.

The active initiator method includes: step S101, step S102, and step S103; the passive partner method includes: step S201 and step S202.

Step S101: In the process of sending and receiving image transmission signals in the first working frequency band, estimate the channel quality of the first working frequency band based on the image transmission signals obtained by receiving and sending.

Step S201: In the process of transmitting and receiving the image transmission signal in the first working frequency band, send a first feedback signal for the opposite end to estimate the channel quality of the first working frequency band.

The transmission and reception of image transmission signals in the first working frequency band is normal working communication. In the process of sending and receiving image transmission signals in the first working frequency band, the received and received image transmission signals can accurately and objectively reflect the signal quality of the current first working frequency band. Any existing channel estimation method can be used to estimate the channel of the first working frequency band. The quality is not limited here. Generally, in the channel estimation method, both ends need to interact, that is, one end actively sends a data signal for channel estimation, and the other end needs to send a feedback signal to the opposite end after receiving the data signal. Channel quality can reflect the current channel conditions. The indicators that reflect channel quality include but are not limited to: delay, signal-to-noise ratio, bit error rate, retransmission rate, air interface rate, signal strength, data throughput, bit error rate, Symbol error rate, etc.

According to the actual situation, under the condition of not affecting the normal working communication as much as possible, if the image transmission signal received and received during the process of receiving and sending the image transmission signal in the first working frequency band is very good, and no packet loss or error packet occurs, you can temporarily do not need to estimate it. The channel quality of the first working frequency band; if it is found that the image transmission signal received and received in the process of receiving and sending the image transmission signal in the first working frequency band has a tendency to deteriorate, or it may be good and bad, or directly deteriorate, etc., there is loss If a packet error occurs, it is possible to use any existing channel estimation method to estimate the channel quality of the first working frequency band during the process of transmitting and receiving the image transmission signal in the first working frequency band.

Step S102: Time-sharing sending uplink data packets at different frequency points of the second working frequency band to estimate the channel quality of the second working frequency band.

Step S202: In response to the peer end receiving downlink data packets at different frequency points of the second working frequency band in a time-sharing manner, and sending a second feedback signal for the peer end to estimate the channel quality of the second working frequency band.

In order not to affect normal working communication, but at the same time hoping to accurately and objectively estimate the channel quality of the second working frequency band, in the process of sending and receiving video transmission signals in the first working frequency band, the uplink data is sent at different frequency points of the second working frequency band in a time-sharing manner. Packet (abbreviated as time-sharing transmission) to estimate the channel quality of the second working frequency band. The function of time-sharing transmission is dynamic, and the time interval can be fixed or not, and it does not affect normal working communication. Compared with sending at a certain frequency of the second working band, sending at a different frequency of the second working band, on the one hand, the wireless channel has large-scale fading and small-scale fading, and the received signal will have relatively large fluctuations. To remove this influence, it is more accurate and objective to estimate the channel quality of the second working frequency band by evaluating the channel quality of the second working frequency band according to multiple different frequency points of the second working frequency band. On the other hand, it is convenient to select the best frequency point. If subsequently switching to the second working frequency band for working communication, the selected best frequency point can be used as the best working frequency point for working communication.

Among them, the specific method of time-sharing transmission is not limited, as long as it does not affect normal working communication. For example: if there is a relatively long period of idle time during the process of sending and receiving video transmission signals in the first working frequency band, and there is a relatively long period of time when the video transmission signal is not being sent and received, you can use more than one frequency point in the second working frequency band (specifically Determine according to the length of the intermediate interval. If the intermediate interval is short, send it at one frequency of the second working frequency band. If the intermediate interval is relatively long, send it at two frequencies of the second working frequency band one after the other, etc.) Send uplink data pack.

Among them, the number of frequency points on the second working frequency band is not limited, and is determined according to actual needs. Generally speaking, the more the number, the longer it takes to measure the time, just select the appropriate number of frequency points.

2.4G frequency band and 5.8G frequency band are commonly used communication frequency bands, therefore, the first working frequency band includes 2.4G frequency band, the second working frequency band includes 5.8G frequency band, or the first working frequency band includes 5.8G frequency band, and the second working frequency band includes 2.4G frequency band. Frequency band.

In one application, different frequency points are evenly distributed in the second working frequency band, so as to estimate the channel quality of the second working frequency band as objectively and accurately as possible. For example: the second working frequency band includes the 2.4G frequency band, the available frequencies are 2400M-2483.5M, and the selected frequency points can include 2400M, 2420M, 2440M, 2460M, 2480M.

Step S103: When the channel quality of the first working frequency band does not meet the preset condition, judge whether to use the second working frequency band to send and receive image transmission signals according to the channel quality of the second working frequency band.

Frequent switching of the working frequency band will also affect normal working communication. Therefore, the embodiment of the present application considers whether to switch the working frequency band when the channel quality of the first working frequency band does not meet the preset condition. The preset conditions are set according to specific actual applications and actual requirements. Usually they can be specific values of an indicator of channel quality, such as: preset signal-to-noise ratio, preset bit error rate, preset retransmission rate, preset Signal strength, etc. If the channel quality of the first working frequency band meets the preset conditions, it means that the image transmission signal sent and received in the first working frequency band meets the working requirements. Even if the channel quality of the second working frequency band is better than the channel quality of the first working frequency band, there is no need to switch work. Frequency band. If the channel quality of the first working frequency band does not meet the preset conditions, it is necessary to further determine whether to use the second working frequency band to send and receive image transmission signals according to the channel quality of the second working frequency band instead of directly using the second working frequency band to send and receive image transmission signals. Obviously, if the channel quality of the first working frequency band does not meet the preset conditions, but the current channel quality of the first working frequency band is still better than the channel quality of the second working frequency band, there is no need to switch at this time. In this way, unnecessary frequent switching of working frequency bands can be further avoided, and normal working communication can be prevented from being affected.

It should be noted that there is no obvious sequence relationship between step S101 and step S102. There is no obvious sequence relationship between step S201 and step S202.

In the embodiment of the present application, in the process of receiving and sending image transmission signals in the first working frequency band, the channel quality of the first working frequency band is estimated based on the image transmission signals obtained by receiving and sending; the uplink data is sent at different frequency points of the second working frequency band in a time-sharing manner. The package is used to estimate the channel quality of the second working frequency band; when the channel quality of the first working frequency band does not meet the preset condition, determine whether to use the second working frequency band to send and receive image transmission signals according to the channel quality of the second working frequency band. Since the image transmission signal is still being sent and received in the first working frequency band, normal working communication can be obtained without affecting the normal working frequency and accurate channel quality of the first working frequency band; and there is no objective basis to estimate the channel quality of the second working frequency band in the existing method. In contrast, since the uplink data packets are sent at different frequency points of the second working frequency band in a time-sharing manner during the process of sending and receiving video transmission signals in the first working frequency band to estimate the channel quality of the second working frequency band, this objective basis can be used to estimate the channel quality of the second working frequency band. At the same time, more accurate and objective channel quality of the second working frequency band is obtained. When the channel quality of the first working frequency band and the second working frequency band are relatively accurate, when the working frequency band needs to be selected, it can provide a powerful tool for accurately selecting the working frequency band. Support can provide strong support for improving communication quality and increasing communication distance.

The specific methods of time-sharing transmission and reception are described in detail below.

In an embodiment, step S102 may specifically be: sending uplink data packets at different frequency points of the second working frequency band at a preset time interval to estimate the channel quality of the second working frequency band. In this embodiment, the preset time interval may be fixed or not. The method of time-sharing transmission is simple, convenient, and easy to implement. Similarly, step S202 may specifically be: responding to the opposite end to receive downlink data packets at different frequency points of the second working frequency band at a preset time interval.

Wherein, the preset time interval is fixed, which is relatively easier to implement. That is, step S102 may also include: sending uplink data packets at different frequency points of the second working frequency band at a preset fixed time interval to estimate the second working frequency band Channel quality. Similarly, step S202 may specifically be: responding to the opposite end to receive downlink data packets at different frequency points of the second working frequency band at a preset fixed time interval.

In a relatively common implementation manner, the process of sending and receiving the image transmission signal includes multiple sub-processes of receiving and sending the image transmission signal, and the time length of each sub-process of receiving and sending the image transmission signal is the same. In this way, it is easier to implement time-sharing transmission in the process of sending and receiving the image transmission signal in the first working frequency band.

Wherein, the preset fixed time interval includes the time length of each successively adjacent frequency point to send the uplink data packet and the time length of the sub-process of sending and receiving the image transmission signal.

In order not to affect the normal communication, the time length of the sub-process of sending and receiving the image transmission signal is greater than the time length of each frequency point to send the uplink data packet. In practical applications, usually the time length of the sub-processes of sending and receiving the image transmission signal is much longer than the time length of each frequency point to send the uplink data packet.

When you are not in a hurry to switch the working frequency band, or in order to avoid inaccurate and non-objective estimation caused by possible accidental factors in a cyclic measurement, in an application, a cyclic measurement method is adopted, that is, step S102 may also include: The uplink data packets are cyclically sent at different frequency points of the second working frequency band to estimate the channel quality of the second working frequency band. Similarly, step S202 may further include: cyclically receiving downlink data packets at different frequency points of the second working frequency band in response to the opposite end in a time-sharing manner. In this way, it is easier to remove the influence of some bad factors on the estimation result, so that the estimated channel quality of the second working frequency band is more accurate and objective.

As shown in Figure 4, the first working frequency band is frequency band A, which is marked as f(work) in the figure, and the second working frequency band is frequency band B. For frequency band B, three frequency points f1, f2, f3 are selected, and the process of sending and receiving image transmission signals Including multiple sub-processes for receiving and sending video transmission signals, the time length T_w of each sub-process for receiving and sending video transmission signals is the same, and the time length T_m for sending uplink data packets at each frequency point is the same, and T_w is much larger than T_m. The uplink data packets are sent sequentially at the frequency points f1, f2, and f3 by means of cyclic measurement.

As mentioned above, there are many indicators of channel quality. Among them, the signal-to-noise ratio is a commonly used indicator. In one application, the channel quality uses the signal-to-noise ratio indicator. Step S102 may include: sending uplink data packets at different frequency points of the second working frequency band in time sharing to estimate the signal-to-noise ratio of the second working frequency band.

Specifically, the method for estimating the signal-to-noise ratio of the second working frequency band is shown in FIG. 5, that is, step S102 time-sharing sending uplink data packets at different frequency points of the second working frequency band to estimate the signal-to-noise ratio of the second working frequency band also includes : Sub-step S1021, sub-step S1022, and sub-step S1023.

Sub-step S1021: sending uplink data packets at different frequency points of the second working frequency band in a time-sharing manner.

Sub-step S1022: Obtain the average received power of the second working frequency band according to the received power of the uplink data packets at different frequency points.

In this embodiment, the received power of uplink data packets at different frequency points is usually obtained by feedback from the peer end.

Sub-step S1023: Obtain the signal-to-noise ratio of the second working frequency band through the average received power of the second working frequency band and the noise power of the best frequency point of the second working frequency band obtained through interference detection.

When the channel quality adopts the signal-to-noise ratio index, the preset condition may be the preset signal-to-noise ratio. In this case, step S103 may include:

Sub-step S1031: When the signal-to-noise ratio of the first working frequency band is less than the preset signal-to-noise ratio, determine the magnitude of the signal-to-noise ratio of the first working frequency band and the signal-to-noise ratio of the second working frequency band.

Sub-step S1032: If the signal-to-noise ratio of the first working frequency band is greater than or equal to the signal-to-noise ratio of the second working frequency band, it is determined not to use the second working frequency band to send and receive video transmission signals.

Sub-step S1033: If the signal-to-noise ratio of the first working frequency band is less than the signal-to-noise ratio of the second working frequency band, it is determined to use the second working frequency band to send and receive video transmission signals.

Through the above method, unnecessary switching can be avoided, and when the signal-to-noise ratio of the first working frequency band is less than the signal-to-noise ratio of the second working frequency band, the working frequency band can be switched to the second working frequency band.

At this time, step S101 may include: in the process of transmitting and receiving the image transmission signal in the first working frequency band, estimating the signal-to-noise ratio of the first working frequency band based on the image transmission signal obtained by the transmission and reception.

In order to ensure that both ends do not affect normal working communication, but also can send and receive synchronously in time-sharing, in practical applications, it is usually realized by means of synchronous switching instructions.

Wherein, step S102 may include: according to the first synchronous switching instruction at different times, sending uplink data packets at different frequency points of the second working frequency band to estimate the channel quality of the second working frequency band; according to the second synchronous switching instruction at different times, Send and receive video transmission signals in the first working frequency band.

Similarly, step S202 may include: responding to the opposite end to receive downlink data packets at different frequencies of the second working frequency band according to the first synchronous switching command at different times; and according to the second synchronous switching command at different times, sending and receiving data in the first working frequency band. Signal.

There are many specific implementations of the synchronous switching command, for example: pre-appointing the switching time, pre-appointing the switching time before switching, and so on. In an application, the first synchronization switching instruction includes a first synchronization frame sequence number, and the second synchronization switching instruction includes a second synchronization frame sequence number. That is, the frame sequence numbers maintained at both ends are the same at the same time, and it is agreed to switch synchronously at a specific frame sequence number. This method is simple, convenient, and flexible.

In the following, a specific embodiment is used to illustrate the method of the embodiment of the present application in detail.

For example, the first working frequency band is A, the second working frequency band is B, and K (according to the actual number of selected frequency points K) different frequency points f1, f2, ..., fk are uniformly selected on the frequency band B. After the normal time period T_w for sending and receiving the image transmission signal in frequency band A, both ends switch to frequency f1 at the same time, and conduct short-term communication at this frequency (ie, send and receive data packets), and the duration is T_m (usually T_w is much larger than T_m, to ensure that the measurement will not affect the normal working communication), the received power P _r dBm(f ₁ ,1) at the frequency point f1 is measured. After the measurement is completed, both ends switch back to the working frequency band A at the same time, and in the frequency band A After the normal transmission and reception of the image transmission signal time period T_w, both ends switch to the frequency point f2 at the same time, and so on. The frequency point circulates between f1 and fk, that is, after measuring fk, the next time f1 is measured.

When K frequency points are traversed N times (according to the actual selection of the number of cycles N), the average received power of frequency band B is obtained:

When transmitting and receiving the image transmission signal in the working frequency band A, the received power of the working frequency band A can be measured as P _r dBm(A). Through the interference detection of the working frequency band A for a period of time, the best working frequency point FREQ(A) in the range of the frequency band A is selected. At this frequency point FREQ(A), the noise power received during communication is the smallest, which is recorded as P _noise dBm(A). Use the same method to select the best operating frequency point FREQ(B) in the range of frequency band B. At this frequency point FREQ(B), the noise power suffered during communication is the smallest, which is recorded as P _noise dBm(B).

Use the signal-to-noise ratio to measure the actual reception effect of the two frequency bands, and get:

SNR(A)=P _r dBm(A)-P _noise dBm(A)

When the signal-to-noise ratio SNR(A) of working frequency band A is less than the preset signal-to-noise ratio, if SNR(B)>SNR(A), both ends configure frequency band B as the working frequency band to send and receive image transmission signals, and configure frequency band A It is an idle frequency band, otherwise the status quo will be maintained.

Through the above method, unnecessary switching can be avoided, and when the signal-to-noise ratio of the working frequency band A is less than the signal-to-noise ratio of the working frequency band B, the working frequency band can be switched to the working frequency band B to send and receive image transmission signals.

Referring to Figure 6, Figure 6 is a schematic structural diagram of an embodiment of a dual-band multi-frequency adaptive channel estimation device according to the present application. It should be noted that the device in this embodiment is an active initiator device, which can perform the above-mentioned active initiator For detailed descriptions of the steps in the method and related content, please refer to the above method section, which will not be repeated here.

The device 100 includes: a memory 11, a processor 12, and a communication circuit 13; the memory 11, the communication circuit 13 and the processor 12 are connected by a bus 14.

Among them, the processor 12 may be a micro control unit, a central processing unit, or a digital signal processor, and so on. The memory 11 may be a Flash chip, a read-only memory, a magnetic disk, an optical disk, a U disk, or a mobile hard disk, etc.

The communication circuit 13 is used for sending and receiving image transmission signals in the first working frequency band; and in the process of sending and receiving image transmission signals in the first working frequency band, time-sharing sending uplink data packets at different frequency points of the second working frequency band; the memory 11 is used for Store a computer program; the processor 12 is used to execute the computer program and when the computer program is executed, the following steps are implemented:

In the process of sending and receiving the image transmission signal in the first working frequency band, estimate the channel quality of the first working frequency band based on the image transmission signal obtained by receiving and sending; and, according to the uplink data packets sent at different frequency points of the second working frequency band in a time-sharing manner, Estimating the channel quality of the second working frequency band; when the channel quality of the first working frequency band does not meet the preset condition, judge whether to use the second working frequency band to send and receive image transmission signals according to the channel quality of the second working frequency band.

In the embodiment of the present application, in the process of receiving and transmitting image transmission signals in the first working frequency band, the channel quality of the first working frequency band is estimated based on the image transmission signals obtained by receiving and sending; uplink data is sent at different frequency points of the second working frequency band in a time-sharing manner The package is used to estimate the channel quality of the second working frequency band; when the channel quality of the first working frequency band does not meet the preset condition, judge whether to use the second working frequency band to send and receive image transmission signals according to the channel quality of the second working frequency band. Since the sending and receiving of image transmission signals in the first working band is still in progress, normal working communication can be obtained without affecting the normal working communication and accurate channel quality of the first working band can be obtained; there is no objective basis for estimating the channel quality of the second working band in the existing method. In contrast, since the uplink data packets are sent at different frequency points of the second working frequency band in time sharing in the process of sending and receiving video transmission signals in the first working frequency band to estimate the channel quality of the second working frequency band, this objective method can be used to estimate the channel quality of the second working frequency band. At the same time, more accurate and objective channel quality of the second working frequency band is obtained. When the channel quality of the first working frequency band and the second working frequency band are relatively accurate, when the working frequency band needs to be selected, it can provide a powerful tool for accurately selecting the working frequency band. Support can provide strong support for improving communication quality and increasing communication distance.

Among them, the device includes unmanned aerial vehicles.

Wherein, the communication circuit is used to send uplink data packets at different frequency points of the second working frequency band at preset time intervals; when the processor executes the computer program, the following steps are implemented: according to the difference in the second working frequency band at the preset time interval Estimate the channel quality of the second working frequency band for the uplink data packets sent at the frequency point.

Wherein, the communication circuit is used to send uplink data packets at different frequency points of the second working frequency band at preset fixed time intervals; when the processor executes the computer program, the following steps are implemented: Estimate the channel quality of the second working frequency band for uplink data packets sent at different frequencies.

Wherein, the process of receiving and sending the image transmission signal includes multiple sub-processes of receiving and sending the image transmission signal, and the time length of each sub-process of receiving and sending the image transmission signal is the same.

Among them, the time length of the sub-process of receiving and sending the image transmission signal is greater than the time length of each frequency point to send the uplink data packet.

Among them, the communication circuit is used to cyclically transmit uplink data packets at different frequency points of the second working frequency band in time sharing; when the processor executes the computer program, the following steps are implemented: according to time sharing at different frequency points of the second working frequency band The sent uplink data packet estimates the channel quality of the second working frequency band.

Among them, the different frequency points are evenly distributed in the second working frequency band.

Wherein, when the processor executes the computer program, the following steps are implemented: according to the uplink data packets sent at different frequency points of the second working frequency band in a time-sharing manner, the signal-to-noise ratio of the second working frequency band is estimated.

Wherein, when the processor executes the computer program, it implements the following steps: obtain the average received power of the second working frequency band according to the received power of uplink data packets at different frequency points; pass the average received power of the second working frequency band and the second working frequency band obtained by interference detection. Second, the noise power of the best frequency point of the working frequency band, and the signal to noise ratio of the second working frequency band is obtained.

Wherein, when the processor executes the computer program, it implements the following steps: when the signal-to-noise ratio of the first working frequency band is less than the preset signal-to-noise ratio, determine the difference between the signal-to-noise ratio of the first working frequency band and the signal-to-noise ratio of the second working frequency band Size; if the signal-to-noise ratio of the first working frequency band is greater than or equal to the signal-to-noise ratio of the second working frequency band, it is determined not to use the second working frequency band to send and receive video transmission signals; if the signal-to-noise ratio of the first working frequency band is less than the second working frequency band If the signal-to-noise ratio is higher, it is determined to use the second working frequency band to send and receive video signals.

Wherein, when the processor executes the computer program, the following steps are implemented: in the process of transmitting and receiving the image transmission signal in the first working frequency band, the signal-to-noise ratio of the first working frequency band is estimated based on the image transmission signal obtained by the transmission and reception.

The communication circuit is used to send uplink data packets at different frequency points of the second working frequency band according to the first synchronous switching instructions at different times; and to send and receive image transmission signals in the first working frequency band according to the second synchronous switching instructions at different times.

Wherein, the first synchronization switching instruction includes a first synchronization frame sequence number, and the second synchronization switching instruction includes a second synchronization frame sequence number.

Among them, the first working frequency band includes the 2.4G frequency band, the second working frequency band includes the 5.8G frequency band, or the first working frequency band includes the 5.8G frequency band, and the second working frequency band includes the 2.4G frequency band.

The present application also provides a dual-band multi-frequency point adaptive channel estimation device. It should be noted that the device in this embodiment is a passive cooperating terminal device, and the device can execute the steps in the above passive cooperating terminal method. Details of the related content For instructions, please refer to the above method section, so I won’t repeat it here.

The device includes: a communication circuit; the communication circuit is used to: send and receive image transmission signals in a first working frequency band; in the process of sending and receiving image transmission signals in the first working frequency band, send a first feedback signal for the peer to estimate the frequency of the first working frequency band. Channel quality; responding to the opposite end receiving downlink data packets at different frequency points of the second working frequency band in a time-sharing manner, and sending a second feedback signal for the opposite end to estimate the channel quality of the second working frequency band.

In the embodiment of the present application, in the process of receiving and transmitting the image transmission signal in the first working frequency band, the first feedback signal is sent for the peer end to estimate the channel quality of the first working frequency band; in response to the peer end at different frequency points of the second working frequency band in a time-sharing manner Receive a downlink data packet, and send a second feedback signal for the opposite end to estimate the channel quality of the second working frequency band. Since the image transmission signal is still being sent and received in the first working frequency band, normal working communication can be obtained without affecting the normal working frequency and accurate channel quality of the first working frequency band; and there is no objective basis to estimate the channel quality of the second working frequency band in the existing method. In contrast, since the uplink data packets are sent at different frequency points of the second working frequency band in a time-sharing manner during the process of sending and receiving video transmission signals in the first working frequency band to estimate the channel quality of the second working frequency band, this objective basis can be used to estimate the channel quality of the second working frequency band. At the same time, more accurate and objective channel quality of the second working frequency band is obtained. When the channel quality of the first working frequency band and the second working frequency band are relatively accurate, when the working frequency band needs to be selected, it can provide a powerful tool for accurately selecting the working frequency band. Support can provide strong support for improving communication quality and increasing communication distance.

Among them, the device includes a remote control.

Wherein, the communication circuit is used to respond to the opposite end to receive downlink data packets at different frequency points of the second working frequency band at a preset time interval.

Wherein, the communication circuit is used to respond to the opposite end to receive downlink data packets at different frequency points of the second working frequency band at a preset fixed time interval.

Wherein, the preset fixed time interval includes the time length of each successively adjacent frequency point receiving the downlink data packet and the time length of the sub-process of sending and receiving the image transmission signal.

Among them, the time length of the sub-process of receiving and sending the image transmission signal is greater than the time length of receiving the downlink data packet at each frequency point.

Wherein, the communication circuit is used to respond to the opposite end to cyclically receive downlink data packets at different frequency points of the second working frequency band in a time-sharing manner.

Among them, the indicator of channel quality includes signal-to-noise ratio.

Wherein, the communication circuit is used to respond to the opposite end to receive downlink data packets at different frequencies of the second working frequency band according to the first synchronous switching command at different times; according to the second synchronous switching command at different times, to send and receive image transmissions in the first working frequency band signal.

This application also provides a computer-readable storage medium that stores a computer program, and when the computer program is executed by a processor, the processor realizes the dual-band multi-frequency point adaptive channel estimation method as described above. For a detailed description of the relevant content, please refer to the above-mentioned dual-band multi-frequency adaptive channel estimation method section, which will not be repeated here.

Wherein, the computer-readable storage medium may be an internal storage unit of the aforementioned system for transmitting positioning assistance data, such as a hard disk or memory of a system for transmitting positioning assistance data. The computer-readable storage medium may also be an external storage device of the system for transmitting positioning assistance data, such as a plug-in hard disk, smart memory card, secure digital card, flash memory card, etc., equipped on the system for transmitting positioning assistance data.

It should be understood that the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the application.

It should also be understood that the term "and/or" used in the specification and appended claims of this application refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

The above are only specific embodiments of this application, but the scope of protection of this application is not limited to this. Any person skilled in the art can easily think of various equivalents within the technical scope disclosed in this application. Modifications or replacements, these modifications or replacements shall be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A dual-band multi-frequency point adaptive channel estimation method, which is characterized in that it comprises:

In the process of sending and receiving video transmission signals in the first working frequency band, estimating the channel quality of the first working frequency band based on the video transmission signals obtained by receiving and sending; and,

Time-sharing sending uplink data packets at different frequency points of the second working frequency band to estimate the channel quality of the second working frequency band;

When the channel quality of the first working frequency band does not meet the preset condition, determining whether to use the second working frequency band to send and receive image transmission signals according to the channel quality of the second working frequency band.
The method according to claim 1, wherein the time-sharing sending uplink data packets at different frequency points of the second working frequency band to estimate the channel quality of the second working frequency band comprises:

Send uplink data packets at different frequency points of the second working frequency band at preset time intervals to estimate the channel quality of the second working frequency band.
The method according to claim 2, wherein the sending uplink data packets at different frequency points of the second working frequency band at a preset time interval to estimate the channel quality of the second working frequency band comprises:

Send uplink data packets at different frequency points of the second working frequency band at preset fixed time intervals to estimate the channel quality of the second working frequency band.
The method according to claim 3, wherein the process of sending and receiving the image transmission signal includes multiple sub-processes of receiving and sending the image transmission signal, and the time length of each sub-process of receiving and sending the image transmission signal is the same.
The method according to claim 4, wherein the preset fixed time interval includes the time length of each successively adjacent frequency point to send the uplink data packet and the time length of the sub-process of sending and receiving the image transmission signal.
The method according to claim 5, wherein the time length of the sub-process of sending and receiving the image transmission signal is greater than the time length of sending the uplink data packet at each frequency point.
The method according to any one of claims 1-6, wherein the time-sharing sending uplink data packets at different frequency points of the second working frequency band to estimate the channel quality of the second working frequency band comprises:

The uplink data packets are cyclically sent at different frequency points of the second working frequency band in time sharing to estimate the channel quality of the second working frequency band.
The method according to any one of claims 1-7, wherein the different frequency points are evenly distributed in the second working frequency band.
The method according to any one of claims 1-8, wherein the time-sharing sending uplink data packets at different frequency points of the second working frequency band to estimate the channel quality of the second working frequency band comprises:

The uplink data packets are sent at different frequency points of the second working frequency band in time sharing to estimate the signal-to-noise ratio of the second working frequency band.
The method according to claim 9, wherein the time-sharing sending uplink data packets at different frequency points of the second working frequency band to estimate the signal-to-noise ratio of the second working frequency band comprises:

Time-sharing sending uplink data packets at different frequency points of the second working frequency band;

Obtaining the average received power of the second working frequency band according to the received power of the uplink data packets at different frequency points;

The signal-to-noise ratio of the second working frequency band is obtained through the average received power of the second working frequency band and the noise power of the best frequency point of the second working frequency band obtained through interference detection.
The method according to claim 9, wherein when the channel quality of the first working frequency band does not meet a preset condition, judging whether to use the second working frequency band for receiving and sending according to the channel quality of the second working frequency band Image transmission signal, including:

When the signal-to-noise ratio of the first working frequency band is less than the preset signal-to-noise ratio, judging the magnitude of the signal-to-noise ratio of the first working frequency band and the signal-to-noise ratio of the second working frequency band;

If the signal-to-noise ratio of the first working frequency band is greater than or equal to the signal-to-noise ratio of the second working frequency band, it is determined not to use the second working frequency band to send and receive video transmission signals;

If the signal-to-noise ratio of the first working frequency band is less than the signal-to-noise ratio of the second working frequency band, it is determined to use the second working frequency band to send and receive video transmission signals.
The method according to claim 11, wherein, in the process of transmitting and receiving the image transmission signal in the first working frequency band, estimating the channel quality of the first working frequency band based on the image transmission signal obtained by the transmission and reception comprises:

In the process of transmitting and receiving the image transmission signal in the first working frequency band, the signal-to-noise ratio of the first working frequency band is estimated based on the image transmission signal obtained by the transmission and reception.
The method according to any one of claims 1-12, wherein the time-sharing sending uplink data packets at different frequency points of the second working frequency band to estimate the channel quality of the second working frequency band comprises:

According to the first synchronous switching instructions at different times, sending uplink data packets at different frequency points of the second working frequency band to estimate the channel quality of the second working frequency band;

According to the second synchronous switching instructions at different moments, the image transmission signal is sent and received in the first working frequency band.
The method according to claim 13, wherein the first synchronization switching instruction includes a first synchronization frame sequence number, and the second synchronization switching instruction includes a second synchronization frame sequence number.
The method according to any one of claims 1-14, wherein the first working frequency band comprises a 2.4G frequency band, the second working frequency band comprises a 5.8G frequency band, or the first working frequency band comprises a 5.8G frequency band. Frequency band, the second working frequency band includes a 2.4G frequency band.
A dual-band multi-frequency point adaptive channel estimation method, which is characterized in that it comprises:

In the process of receiving and transmitting the image transmission signal in the first working frequency band, sending a first feedback signal for the peer end to estimate the channel quality of the first working frequency band;

In response, the opposite end receives downlink data packets at different frequency points of the second working frequency band in a time-sharing manner, and sends a second feedback signal for the opposite end to estimate the channel quality of the second working frequency band.
The method according to claim 16, wherein the responding to the opposite end to receive downlink data packets at different frequency points of the second working frequency band in a time-sharing manner comprises:

The responding peer receives the downlink data packet at different frequency points of the second working frequency band at a preset time interval.
The method according to claim 17, wherein the responding to the opposite end to receive downlink data packets at different frequency points of the second working frequency band at a preset time interval comprises:

The responding peer receives the downlink data packet at different frequency points of the second working frequency band at a preset fixed time interval.
The method according to claim 18, wherein the process of sending and receiving the image transmission signal comprises a plurality of sub-processes of receiving and sending the image transmission signal, and the time length of each sub-process of receiving and sending the image transmission signal is the same.
The method according to claim 19, wherein the predetermined fixed time interval comprises the time length of each successively adjacent frequency point for receiving the downlink data packet and the time length of the sub-process of sending and receiving the image transmission signal.
The method according to claim 20, wherein the time length of the sub-process of receiving and sending the image transmission signal is greater than the time length of receiving the downlink data packet at each frequency point.
The method according to any one of claims 16-21, wherein the responding to the opposite end to receive downlink data packets at different frequency points of the second working frequency band in a time-sharing manner comprises:

In response to the opposite end, the downlink data packet is received cyclically at different frequency points of the second working frequency band in a time-sharing manner.
The method according to any one of claims 16-22, wherein the different frequency points are evenly distributed in the second working frequency band.
The method according to any one of claims 16-23, wherein the indicator of channel quality includes a signal-to-noise ratio.
The method according to any one of claims 16-24, wherein the responding to the opposite end to receive downlink data packets at different frequency points of the second working frequency band in a time-sharing manner comprises:

Responding to the opposite end to receive downlink data packets at different frequency points of the second working frequency band according to the first synchronous switching instruction at different moments;

According to the second synchronous switching instructions at different moments, the image transmission signal is sent and received in the first working frequency band.
The method according to claim 25, wherein the first synchronization switching instruction includes a first synchronization frame sequence number, and the second synchronization switching instruction includes a second synchronization frame sequence number.
The method according to any one of claims 16-26, wherein the first working frequency band comprises a 2.4G frequency band, the second working frequency band comprises a 5.8G frequency band, or the first working frequency band comprises a 5.8G frequency band. Frequency band, the second working frequency band includes a 2.4G frequency band.
A dual-band multi-frequency adaptive channel estimation device, characterized in that the device includes: a memory, a processor, and a communication circuit;

The communication circuit is used to send and receive video transmission signals in the first working frequency band; and in the process of sending and receiving video transmission signals in the first working frequency band, time-sharing sending uplink data packets at different frequency points of the second working frequency band;

The memory is used to store a computer program;

The processor is used to execute the computer program and when executing the computer program, implement the following steps:

In the process of sending and receiving video transmission signals in the first working frequency band, estimating the channel quality of the first working frequency band based on the video transmission signals obtained by receiving and sending; and,

Estimate the channel quality of the second working frequency band according to the uplink data packets sent at different frequency points of the second working frequency band in a time-sharing manner;

When the channel quality of the first working frequency band does not meet the preset condition, determining whether to use the second working frequency band to send and receive image transmission signals according to the channel quality of the second working frequency band.
The device of claim 28, wherein the device comprises an unmanned aerial vehicle.
The device according to claim 28, wherein the communication circuit is configured to send uplink data packets at different frequency points of the second working frequency band at a preset time interval;

When the processor executes the computer program, the following steps are implemented:

Estimate the channel quality of the second working frequency band according to uplink data packets sent at different frequency points of the second working frequency band at preset time intervals.
The device according to claim 30, wherein the communication circuit is configured to send uplink data packets at different frequency points of the second working frequency band at a preset fixed time interval;

When the processor executes the computer program, the following steps are implemented:

Estimate the channel quality of the second working frequency band according to uplink data packets sent at different frequency points of the second working frequency band at preset fixed time intervals.
The apparatus according to claim 31, wherein the process of sending and receiving the image transmission signal comprises a plurality of sub-processes of receiving and sending the image transmission signal, and the time length of each sub-process of receiving and sending the image transmission signal is the same.
The apparatus according to claim 32, wherein the predetermined fixed time interval comprises the time length of each successively adjacent frequency point for sending the uplink data packet and the time length of the sub-process of sending and receiving the image transmission signal.
The apparatus according to claim 33, wherein the time length of the sub-process of sending and receiving the image transmission signal is greater than the time length of sending the uplink data packet at each frequency point.
The device according to any one of claims 28-34, wherein the communication circuit is configured to cyclically send uplink data packets at different frequency points of the second working frequency band in a time-sharing manner;

When the processor executes the computer program, the following steps are implemented:

The channel quality of the second working frequency band is estimated according to the uplink data packets that are cyclically sent at different frequency points of the second working frequency band in a time-sharing manner.
The device according to any one of claims 28-35, wherein the different frequency points are evenly distributed in the second working frequency band.
The device according to any one of claims 28-36, wherein the processor implements the following steps when executing the computer program:

Estimate the signal-to-noise ratio of the second working frequency band according to the uplink data packets sent at different frequency points of the second working frequency band in a time-sharing manner.
The device according to claim 37, wherein the processor implements the following steps when executing the computer program:

Obtaining the average received power of the second working frequency band according to the received power of the uplink data packets at different frequency points;

The signal-to-noise ratio of the second working frequency band is obtained through the average received power of the second working frequency band and the noise power of the best frequency point of the second working frequency band obtained through interference detection.
The device according to claim 37, wherein the processor implements the following steps when executing the computer program:

When the signal-to-noise ratio of the first working frequency band is less than the preset signal-to-noise ratio, judging the magnitude of the signal-to-noise ratio of the first working frequency band and the signal-to-noise ratio of the second working frequency band;

If the signal-to-noise ratio of the first working frequency band is greater than or equal to the signal-to-noise ratio of the second working frequency band, it is determined not to use the second working frequency band to send and receive video transmission signals;

If the signal-to-noise ratio of the first working frequency band is less than the signal-to-noise ratio of the second working frequency band, it is determined to use the second working frequency band to send and receive video transmission signals.
The device according to claim 39, wherein the processor implements the following steps when executing the computer program:

In the process of transmitting and receiving the image transmission signal in the first working frequency band, the signal-to-noise ratio of the first working frequency band is estimated based on the image transmission signal obtained by the transmission and reception.
The device according to any one of claims 28-40, wherein the communication circuit is configured to send uplink data packets at different frequencies of the second working frequency band according to the first synchronous switching command at different times; The second synchronous switching instruction at the moment of time sends and receives video transmission signals in the first working frequency band.
The device according to claim 41, wherein the first synchronization switching instruction includes a first synchronization frame sequence number, and the second synchronization switching instruction includes a second synchronization frame sequence number.
The apparatus according to any one of claims 28-42, wherein the first working frequency band comprises a 2.4G frequency band, the second working frequency band comprises a 5.8G frequency band, or the first working frequency band comprises a 5.8G frequency band. Frequency band, the second working frequency band includes a 2.4G frequency band.
A dual-band multi-frequency point adaptive channel estimation device, characterized in that the device comprises: a communication circuit;

The communication circuit is used for:

Send and receive video transmission signals in the first working frequency band;

In the process of receiving and transmitting the image transmission signal in the first working frequency band, sending a first feedback signal for the peer end to estimate the channel quality of the first working frequency band;

In response, the opposite end receives downlink data packets at different frequency points of the second working frequency band in a time-sharing manner, and sends a second feedback signal for the opposite end to estimate the channel quality of the second working frequency band.
The device of claim 44, wherein the device comprises a remote control.
The apparatus according to claim 44, wherein the communication circuit is configured to respond to the opposite end to receive downlink data packets at different frequency points of the second working frequency band at a preset time interval.
The device according to claim 46, wherein the communication circuit is configured to respond to the opposite end to receive downlink data packets at different frequency points of the second working frequency band at a preset fixed time interval.
The apparatus according to claim 47, wherein the process of sending and receiving the image transmission signal comprises a plurality of sub-processes of sending and receiving the image transmission signal, and the time length of each sub-process of receiving and sending the image transmission signal is the same.
The device according to claim 48, wherein the predetermined fixed time interval comprises the time length of each successively adjacent frequency point for receiving the downlink data packet and the time length of the sub-process of sending and receiving the image transmission signal.
The apparatus according to claim 49, wherein the time length of the sub-process of sending and receiving the image transmission signal is greater than the time length of receiving the downlink data packet at each frequency point.
The device according to any one of claims 44 to 50, wherein the communication circuit is configured to respond to the opposite end to cyclically receive downlink data packets at different frequency points of the second working frequency band in a time-sharing manner.
The device according to any one of claims 44-51, wherein the different frequency points are evenly distributed in the second working frequency band.
The apparatus according to any one of claims 44-52, wherein the indicator of channel quality comprises a signal-to-noise ratio.
The device according to any one of claims 44-53, wherein the communication circuit is configured to respond to the opposite end to receive downlink data packets at different frequency points of the second working frequency band according to the first synchronous switching instruction at different times; According to the second synchronous switching instructions at different moments, the image transmission signal is sent and received in the first working frequency band.
The apparatus according to claim 54, wherein the first synchronization switching instruction includes a first synchronization frame sequence number, and the second synchronization switching instruction includes a second synchronization frame sequence number.
The apparatus according to any one of claims 44-55, wherein the first working frequency band comprises a 2.4G frequency band, the second working frequency band comprises a 5.8G frequency band, or the first working frequency band comprises a 5.8G frequency band. Frequency band, the second working frequency band includes a 2.4G frequency band.
A computer-readable storage medium, characterized in that, the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor realizes any one of claims 1-15. A dual-band multi-frequency adaptive channel estimation method.