WO2019205931A1

WO2019205931A1 - Blind scan method and device

Info

Publication number: WO2019205931A1
Application number: PCT/CN2019/081963
Authority: WO
Inventors: 邹志永; 仇径
Original assignee: 华为技术有限公司
Priority date: 2018-04-28
Filing date: 2019-04-09
Publication date: 2019-10-31
Also published as: CN110417493A; CN110417493B

Abstract

Provided in the application are a blind scan method and a device, relating to the technical field of communication. The blind scan method and a device are used to solve the problem that the prior art is not applicable to fast blind scanning of DVB-S2X satellite signals. The method comprises the following steps: a receiver acquiring a signal of a frequency band to be measured; on the basis of a frequency to be measured and a symbol rate to be measured, selecting two frequency spectrum segments from a spectrum corresponding to the signal of the frequency band, the two frequency spectrum segments being symmetric on the basis of the center frequency of the frequency to be measured, and the distance from the center frequency of the two frequency spectrum segments to the frequency to be measured being determined by the symbol rate to be measured; then, calculating a correlation value between the two spectrum segments; and if the correlation value between the two spectrum segments is greater than a preset value, determining that the frequency to be measured and the symbol rate to be measured are a set of candidate channel parameters. This application is applicable to the process of blind scanning.

Description

Blind scanning method and device

This application claims priority to Chinese Patent Application No. 201,810,048, 537, 242, filed on April 28, 2018, and entitled "Blind Sweep Method and Apparatus", the entire contents of which are incorporated herein by reference. In the application.

Technical field

The present application relates to the field of communications technologies, and in particular, to a blind scanning method and apparatus.

Background technique

The satellite television receives the satellite signal according to the channel parameters such as the frequency of the satellite signal and the symbol rate, so that the television program corresponding to the satellite signal can be played. The so-called blind sweep, that is, in the case of the channel parameters of satellite satellite unknown satellite signals, the receiver of the satellite television automatically searches for the correct channel parameters in the specified frequency range.

In the conventional blind scanning method, the receiver of the satellite television first determines a center frequency, and obtains a signal of a minimum symbol rate by using a filter bank, and uses a timing recovery loop to converge the signal. If the timing recovery loop converges, it is determined that the corresponding center frequency and symbol rate are channel parameters of the satellite signal. Then adjust the filter bank, expand the symbol rate, and perform the timing recovery loop convergence attempt again. When the symbol rate exceeds the maximum possible value, the center frequency is replaced, and the above search process is repeated from the minimum symbol rate until the search for all frequency bands is completed. Since the satellite signal has a large symbol frequency range, the signal frequency band is wide, and the convergence of the timing recovery loop also takes a long time, the above-described blind scanning method using the timing recovery loop to cycle through the channel parameters is inefficient.

In order to improve the efficiency of blind scanning, another blind scanning method is proposed in the prior art: a receiver of a satellite television analyzes the energy of a signal spectrum in a frequency range, and if the energy accumulation of the signal spectrum exceeds a set threshold, then The center frequency and the symbol rate corresponding to the signal spectrum are determined to be a set of candidate channel parameters; thereafter, the timing recovery loop is used to converge the signal determined by the set of candidate channel parameters to lock the channel. This method has a good search ability for satellite signals with high signal-to-noise ratio threshold and obvious spectral roll-off. However, in the third-generation digital video broadcasting system standard (Digital Video Broadcasting-Satellite 2X, DVB-S2X), the signal-to-noise ratio threshold of the satellite signal is low (the signal-to-noise ratio threshold is at least -3 dB). Therefore, for the satellite signal of DVB-S2X, the above blind scanning method cannot accurately determine the corresponding candidate channel parameters, so that the corresponding channel cannot be successfully locked.

Summary of the invention

The present application provides a blind scanning method and apparatus for solving the problem that the prior art is not suitable for fast blind scanning of satellite signals of DVB-S2X.

To achieve the above objective, the present application provides the following technical solutions:

In a first aspect, a blind scanning method includes the following steps:

S101. Acquire a signal of a frequency band to be tested.

S102. Based on the frequency to be tested and the symbol rate to be tested, intercept two spectrums from the spectrum corresponding to the signal of the frequency band to be tested. The center frequencies of the two segments are symmetric based on the frequency to be measured, and the center frequencies of the two segments are to be measured. The distance of the measured frequency is determined by the symbol rate to be measured.

S103. Determine a correlation value between the two segments of the spectrum.

S104. If the correlation value between the two segments is greater than a preset value, determine that the frequency to be tested and the symbol rate to be tested are a set of candidate channel parameters.

As shown in Fig. 1, in the spectrum of the satellite signal, the spectrum at the roll-off edge on both sides is symmetrical, that is, the spectrum at the edge of the roll-off edge has a correlation characteristic. Therefore, in the technical solution of the present application, the receiver intercepts two frequency spectra from the spectrum corresponding to the signal of the frequency band to be tested based on the frequency to be tested and the symbol rate to be tested, and determines a correlation value between the two segments, thereby To determine whether the two segments of the spectrum are the spectrum at the roll-off edges on both sides of the spectrum of the satellite signal. If the correlation value of the two sections of the spectrum is greater than the preset value, it means that the two sections of the spectrum are likely to be the spectrum of the two sides of the spectrum of the satellite signal, indicating that the frequency to be tested and the symbol rate to be tested have It is highly likely that it corresponds to a satellite message. Therefore, the receiver determines the frequency to be tested and the symbol rate to be tested as a set of candidate channel parameters. It can be understood that the spectrum of the edge of the satellite signal in the spectrum of the satellite signal with low signal-to-noise ratio threshold has the same characteristic. Therefore, the technical solution of the present application can be applied to a satellite signal with a low signal-to-noise ratio threshold, thereby solving the problem that the prior art is not suitable for fast blind scanning of a satellite signal of the DVB-S2X.

In a possible design, after obtaining the signal of the frequency band to be tested, the method further comprises: performing fast Fourier transform on the signal of the frequency band to be measured, and determining a spectrum corresponding to the signal of the frequency band to be tested.

In a possible design, the method further includes: S1051, adjusting the frequency to be tested, and performing steps S102 to S104 again until the adjusted frequency to be tested exceeds the frequency band to be tested. S1061: Adjust the symbol rate to be tested, reset the frequency to be tested to the initial frequency, and perform steps S102 to S1051 again until the adjusted symbol rate to be tested exceeds the preset symbol rate range. Based on the above technical solution, the receiver can determine all candidate channel parameters in the frequency band to be tested.

In a possible design, the method further includes: S1052: adjusting a symbol rate to be tested, and performing steps S102 to S104 again until the adjusted symbol rate to be tested exceeds a preset symbol rate range. S1062: Adjust the frequency to be tested, reset the symbol rate to be tested to the initial symbol rate, and perform steps S102 to S1052 again until the adjusted frequency to be tested exceeds the frequency band to be tested. Based on the above technical solution, the receiver can determine all candidate channel parameters in the frequency band to be tested.

Optionally, the adjusting the frequency to be tested includes: increasing the frequency to be tested by using the first step length; or decreasing the frequency to be tested by using the first step length.

Optionally, the adjusting the symbol rate to be tested includes: increasing the symbol rate to be tested in the second step; or decreasing the symbol rate to be tested in the second step.

In an optional implementation manner, after determining the frequency to be tested and the symbol rate to be tested as a set of candidate channel parameters, the method further includes: acquiring a channel according to the set of candidate channel parameters. In this way, the receiver can lock the channel and extract the program information of the channel to facilitate the user to watch the program.

In an optional implementation manner, the method further includes: generating, by using a plurality of sets of candidate channel parameters, a plurality of sets of candidate channel parameters according to a ranking of correlation values between two pieces of spectrum corresponding to the plurality of sets of candidate channel parameters. Sort order; according to the sort order, one by one according to multiple sets of candidate channel parameters, get the channel. Based on the foregoing technical solution, the greater the correlation value between the two segments of the spectrum corresponding to a set of candidate channel parameters, the more likely the group of candidate channel parameters corresponds to a channel, so the receiver first selects a group of candidates based on the possibility. Channel parameters, get the channel, help the receiver to lock to the channel as soon as possible.

In a second aspect, a blind scanning device includes a tuning module and a demodulation module.

A tuning module for acquiring signals of a frequency band to be tested.

The demodulation module is configured to perform the following steps S102 to S104:

S103. Determine a correlation value between the two segments of the spectrum.

In a possible design, the demodulation module is also used for performing fast Fourier transform on the signal of the frequency band to be measured, and determining the spectrum corresponding to the signal of the frequency band to be tested.

In a possible design, the demodulation module is further configured to perform the following steps S1051 to S1061:

S1051: Adjust the frequency to be tested, and perform steps S102 to S104 again until the adjusted frequency to be tested exceeds the frequency band to be tested.

S1061: Adjust the symbol rate to be tested, reset the frequency to be tested to the initial frequency, and perform steps S102 to S1051 again until the adjusted symbol rate to be tested exceeds the preset symbol rate range.

In a possible design, the demodulation module is further configured to perform the following steps S1052 to S1062:

S1052: Adjust the symbol rate to be tested, and perform steps S102 to S104 again until the adjusted symbol rate to be tested exceeds a preset symbol rate range.

S1062: Adjust the frequency to be tested, reset the symbol rate to be tested to the initial symbol rate, and perform steps S102 to S1052 again until the adjusted frequency to be tested exceeds the frequency band to be tested.

In a possible design, the demodulation module is further used to increase the frequency to be tested by the first step length; or to decrease the frequency to be tested by the first step length.

In a possible design, the demodulation module increases the symbol rate to be tested by the second step size; or decreases the symbol rate to be tested by the second step size.

In one possible design, the demodulation module is further configured to acquire a channel based on a set of candidate channel parameters.

In a possible design, the demodulation module is further configured to generate a sort order of multiple sets of candidate channel parameters according to a sorting of correlation values between two pieces of spectrum corresponding to the plurality of sets of candidate channel parameters; Obtain the channel one by one according to multiple sets of candidate channel parameters.

In a third aspect, there is provided a receiver having the function of implementing the blind scanning method of any of the above first aspects. This function can be implemented in hardware or in hardware by executing the corresponding software. The hardware or software includes one or more modules corresponding to the functions described above.

In a fourth aspect, a receiver is provided, comprising: a processor, a memory, a bus, and a communication interface; the memory is configured to store a computer to execute an instruction, and the processor is connected to the memory through the bus, when The processor executes the computer-executed instructions stored by the memory to cause the receiver to perform the blind scan method as described in any of the first aspects above.

In a fifth aspect, a receiver is provided, comprising: a processor; the processor is configured to couple with a memory, and after reading an instruction in the memory, according to the instruction, enable the receiver to perform the first aspect as described above A blind scanning method as described.

A sixth aspect, a computer readable storage medium having instructions stored therein that, when run on a computer, cause the computer to perform the blind scan of any of the above first aspects method.

In a seventh aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the blind scan method of any of the above first aspects.

In an eighth aspect, a chip system is provided, the chip system comprising a processor for supporting a receiver to implement the functions involved in the first aspect described above. In a possible design, the chip system further includes a memory for storing necessary program instructions and data of the network device. The chip system can be composed of chips, and can also include chips and other discrete devices.

For the technical effects brought by any one of the second aspect to the eighth aspect, refer to the technical effects brought by different design modes in the first aspect, and details are not described herein again.

DRAWINGS

Figure 1 is a schematic diagram of a spectrum of a satellite signal;

2 is a schematic structural diagram of a receiver according to an embodiment of the present application;

FIG. 3 is a flowchart 1 of a blind scanning method according to an embodiment of the present application;

4 is a second flowchart of a blind scanning method according to an embodiment of the present application;

FIG. 5 is a flowchart 3 of a blind scanning method according to an embodiment of the present disclosure;

6 is a flowchart 4 of a blind scanning method according to an embodiment of the present application;

FIG. 7 is a flowchart 5 of a blind scanning method according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of a blind scanning device according to an embodiment of the present application.

detailed description

The terms "first", "second", and the like in this application are only used to distinguish different objects, and the order is not limited. For example, the first step and the second step are just to distinguish between different step sizes, and do not limit their order.

The term “and/or” in the present application is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B. In addition, the character "/" in the present application generally indicates that the context of the context is an "or" relationship.

It should be noted that, in the present application, the words "exemplary" or "such as" are used to mean an example, illustration, or illustration. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of the words "exemplary" or "such as" is intended to present the concepts in a particular manner.

FIG. 2 is a schematic structural diagram of a receiver provided by an embodiment of the present application. The receiver includes an antenna 11, a tuner 12, and a demodulator 13.

The antenna 11 is configured to receive a signal.

The tuner 12 is configured to select a signal of a frequency band from among signals received by the antenna.

The demodulator 13 is configured to demodulate the signal of the frequency band selected by the tuner.

In an optional implementation manner, the receiver may further include at least one component: a power component, a demultiplexer, an audio decoder, a video decoder, a memory, and a processor.

Among them, the power supply component is used to supply power to other components of the receiver.

The demultiplexer includes a transport stream demultiplexer and a program stream demultiplexer. The transport stream demultiplexer is configured to decompose a transport stream carrying multiple program signals into a plurality of program streams that only carry one program signal. The program stream multiplexer is used to decompose the program stream into a base stream containing only audio, video, and transmission data.

A video decoder is used to decompress video data.

The audio decoder is used to decompress audio data.

The processor can be a general purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits.

The memory may be a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type that can store information and instructions. The dynamic storage device may also be an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical disc storage, or a disc storage device ( Including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be stored by a computer Any other media taken, but not limited to this. The memory can exist independently and be connected to the processor via a bus. The memory can also be integrated with the processor.

FIG. 3 is a flowchart of a blind scanning method provided by an embodiment of the present application. The blind scanning method provided by the embodiment of the present application is suitable for blindly scanning satellite signals of different standards, including but not limited to: Digital Video Broadcasting-Satellite (DVB-S), second generation Digital Video Broadcasting-Satellite 2 (DVB-S2), DVB-S2X. The method includes the following steps:

S101. The receiver acquires a signal of a frequency band to be tested.

Wherein, the frequency band to be tested belongs to a satellite communication frequency band. Optionally, the frequency band to be tested is a part of a satellite communication frequency band, or the frequency band to be tested is an entire satellite communication frequency band. Exemplarily, the preset frequency band is 30 GHz to 31 GHz.

Optionally, after acquiring the signal of the frequency band to be tested, the receiver performs fast Fourier transform on the signal of the frequency band to be tested, and determines a spectrum corresponding to the signal of the frequency band to be tested. It is to be noted that the receiver may also use other implementation manners to determine the frequency spectrum corresponding to the signal of the frequency band to be tested, which is not limited in this embodiment of the present application.

S102. The receiver intercepts two frequency spectra from a frequency spectrum corresponding to the signal of the frequency band to be tested, based on the frequency to be tested and the symbol rate to be tested.

The center frequencies of the two segments of the spectrum are symmetric based on the frequency to be tested, and the distance between the center frequency of the two segments of the spectrum and the frequency to be tested is determined by the symbol rate to be tested.

Optionally, the bandwidths of the two segments are equal. Or, the bandwidths of the two segments are not equal. The bandwidth of the two segments of the spectrum is preset or determined according to the first symbol rate to be tested. If the bandwidth of the two segments of the spectrum is determined according to the first symbol rate to be tested, the bandwidth of the two segments of the spectrum is positively correlated with the first symbol rate to be tested. That is to say, the larger the first symbol rate to be tested, the larger the bandwidth of the two segments of the spectrum.

S103. The receiver determines a correlation value between the two segments of spectrum.

The step S103 can refer to the prior art, and details are not described herein again.

S104. If the correlation value between the two segments of the spectrum is greater than a preset value, the receiver determines that the frequency to be tested and the symbol rate to be tested are a set of candidate channel parameters.

It should be noted that if the correlation value of the two segments of the spectrum is greater than the preset value, it indicates that the symbol rate to be tested and the frequency to be tested are likely to correspond to a satellite signal, so the receiver can determine the symbol rate to be tested. And the frequency to be tested is a set of candidate channel parameters. If the correlation value of the two segments of the spectrum is less than or equal to the preset value, it indicates that the symbol rate to be tested and the frequency to be tested are unlikely to correspond to a satellite signal, so the receiver does not rate the symbol to be tested and the The frequency to be tested is determined as a set of candidate channel parameters.

Optionally, after determining a set of candidate channel parameters, the receiver acquires a channel according to the set of candidate channel parameters. Specifically, the receiver determines a signal of one frequency band according to the candidate channel parameters, and uses a timing recovery loop to try to converge the signal of the frequency band. If the timing recovery loop does not converge within the preset time, it indicates that the corresponding candidate channel parameter does not have a corresponding channel. If the timing recovery loop converges within a preset time, it indicates that the candidate channel parameter has a corresponding channel. Therefore, the receiver locks the channel and extracts program information of the channel, so that the user can watch the program.

The above step S101 can be performed by the tuner shown in FIG. 2, and the above steps S102 to S104 can be performed by the demodulator in the receiver shown in FIG. 2, which is not limited in this embodiment.

In order to determine all the candidate channel parameters in the frequency band to be tested, as shown in FIG. 4, the embodiment of the present application provides a method for blind scanning. After step S104, the method further includes the following steps:

S1051: The receiver adjusts the frequency to be tested, and performs steps S102 to S104 again until the adjusted frequency to be tested exceeds the frequency band to be tested.

Optionally, the adjusting the frequency to be tested includes, but is not limited to, the following implementation manner: increasing the frequency to be tested by using a first step length, or decreasing the frequency to be tested by using a first step length.

Optionally, the first step length is preset or set by a user.

An optional implementation manner, the receiver adjusts the frequency to be tested, and then detects whether the adjusted frequency to be tested exceeds the frequency band to be tested; if the adjusted frequency to be tested does not exceed the frequency band to be tested Then, the receiver re-executes steps S102 to S04. If the adjusted frequency to be tested exceeds the frequency band to be tested, the receiver performs the following step S1061.

S1061: The receiver adjusts the symbol rate to be tested, resets the frequency to be tested to an initial frequency, and performs steps S102 to S1051 again until the adjusted symbol rate to be tested exceeds a preset symbol frequency range.

The initial frequency is a minimum frequency of the frequency band to be tested, or a maximum frequency of the frequency band to be tested.

Optionally, the adjusting the symbol rate to be tested includes, but is not limited to, implementing the method to increase the rate of the symbol to be tested in a second step, or decrease the rate of the symbol to be tested in a second step.

Optionally, the second step is preset or set by a user.

In an optional implementation manner, the receiver adjusts the symbol rate to be tested, and then detects whether the adjusted symbol rate to be tested exceeds a preset symbol rate range. If the adjusted symbol rate to be tested does not exceed the preset symbol rate range, the receiver resets the frequency to be tested to the initial frequency, and performs steps S102 to S1051 again. If the adjusted symbol rate to be tested exceeds a preset symbol rate range, the receiver completes a blind scanning process on the frequency band to be tested.

Optionally, in the blind scanning process, each time a set of candidate channel parameters is determined, the receiver acquires a channel according to the set of candidate channel parameters.

Alternatively, after determining the plurality of sets of candidate channel parameters, the receiver acquires the channels one by one according to the plurality of sets of candidate channel parameters. It can be understood that the greater the correlation value between the two segments of the spectrum corresponding to a set of candidate channel parameters, the more likely the group of candidate channel parameters corresponds to a channel. Therefore, in order to acquire the channel quickly, the receiver first sorts the plurality of sets of candidate channel parameters according to the order of the two pieces of spectrum corresponding to the plurality of sets of candidate channel parameters for the plurality of sets of candidate channel parameters. Sequence; then, the receiver acquires channels according to the plurality of sets of candidate channel parameters one by one according to the sorting order.

Exemplarily, the receiver determines the group A candidate channel parameter, the group B candidate channel parameter, and the group C candidate channel parameter, and the correlation values between the two segments of the A, B, and C candidate channel parameters are: 0.5 , 0.7, 0.6. Therefore, according to the order of the correlation values from large to small, the order of the three sets of candidate channel parameters may be determined as: a group B candidate channel parameter, a group C candidate channel parameter, and a group A candidate channel parameter. In this case, the receiver first acquires a channel according to the B group candidate channel parameters. Then, the receiver acquires the channel according to the C group candidate channel parameters. Finally, the receiver acquires a channel according to the group A candidate channel parameters.

The above steps S1051 and S1061 can be performed by the demodulator in the receiver shown in FIG. 2, which is not limited in this embodiment.

In order to determine all the candidate channel parameters in the frequency band to be tested, as shown in FIG. 5, the embodiment of the present application provides a method for blind scanning. After the step S104, the method further includes the following steps:

S1052: The receiver adjusts the symbol rate to be tested, and performs steps S102 to S104 again until the adjusted symbol rate to be tested exceeds a preset symbol rate range.

In an optional implementation manner, the receiver adjusts the symbol rate to be tested, and then detects whether the adjusted symbol rate to be tested exceeds a preset symbol rate range. If the adjusted symbol rate to be tested does not exceed the preset symbol rate range, the receiver performs steps S102 to S104 again. If the adjusted symbol rate to be tested exceeds a preset symbol rate range, the receiver performs the following step S1062.

S1062: The receiver adjusts the frequency to be tested, resets the symbol rate to be tested to an initial symbol rate, and performs steps S102 to S1052 again until the adjusted frequency to be tested exceeds the frequency band to be tested.

The initial symbol rate is a maximum symbol rate or a minimum symbol rate.

In an optional implementation manner, the receiver adjusts the frequency to be tested, and then detects whether the adjusted frequency to be tested exceeds the frequency band to be tested. If the adjusted frequency to be tested does not exceed the frequency band to be tested, the receiver resets the symbol rate to be tested to an initial symbol rate, and performs steps S102 to S1052 again. If the adjusted frequency to be tested exceeds the frequency band to be tested, the receiver completes a blind scanning process on the frequency band to be tested.

Optionally, in the blind scanning process, each time a set of candidate channel parameters is determined, the receiver acquires a channel according to the set of candidate channel parameters. Alternatively, after determining the plurality of sets of candidate channel parameters, the receiver acquires the channels one by one according to the plurality of sets of candidate channel parameters.

The above steps S1052 and S1062 can be performed by the demodulator in the receiver shown in FIG. 2, which is not limited in this embodiment.

At present, the tuner of the receiver can only obtain the signal of the frequency band of a certain bandwidth. In other words, the tuner cannot acquire the signal of the entire satellite communication frequency band. Therefore, the receiver can only divide the entire satellite communication frequency band into a plurality of frequency bands to be tested, and perform blind scanning on the plurality of the tested frequency bands one by one to complete blind scanning of the entire satellite communication frequency band.

As shown in FIG. 6, a blind scanning method is provided in the embodiment of the present application, and the method is applied to a scenario in which a whole satellite communication frequency band is blindly scanned. The method comprises the following steps: S201-S213.

S201. The receiver acquires a signal of a frequency band to be tested.

S202. The receiver determines a spectrum corresponding to a signal of the frequency band to be tested.

S203. The receiver sets a symbol rate to be tested as an initial symbol rate.

The initial symbol rate is a minimum symbol rate or a maximum symbol rate.

S204. The receiver sets a frequency to be tested as an initial frequency.

The initial frequency is the minimum frequency of the frequency band to be tested, or the maximum frequency of the frequency band to be tested.

S205. The receiver intercepts two frequency spectra from a spectrum corresponding to a signal of the frequency band to be tested according to the frequency to be tested and the symbol rate to be tested.

S206. The receiver determines a correlation value between two pieces of spectrum.

S207. The receiver detects whether a correlation value between the two pieces of spectrum is greater than a preset value.

It should be noted that if the correlation value between the two segments of the spectrum is greater than a preset value, the receiver performs the following step S208. If the correlation value between the two pieces of spectrum is less than or equal to a preset value, the receiver performs the following step S209.

S208. The receiver determines that the frequency to be tested and the symbol rate to be tested are a set of candidate channel parameters.

S209. The receiver adjusts the frequency to be tested by using a first step length.

Referring to step S204, when the initial frequency is the minimum frequency of the frequency band to be tested, the receiver increases the frequency to be tested by using the first step. Alternatively, when the initial frequency is the maximum frequency of the frequency band to be tested, the receiver reduces the frequency to be tested by the first step.

S210. The receiver determines whether the adjusted frequency to be tested is in the frequency band to be tested.

It is to be noted that, if the adjusted frequency to be tested is in the frequency band to be tested, the receiver performs step S205 again to determine whether the measured symbol rate and the adjusted frequency to be tested are another set of candidate channels. parameter. If the adjusted frequency to be tested is not in the frequency band to be tested, the receiver performs the following step S211.

S211. The receiver adjusts the symbol rate to be tested in a second step.

Referring to step S203, if the initial symbol rate is the minimum symbol rate, the receiver increases the symbol rate to be tested by the second step. Alternatively, if the initial symbol rate is the maximum symbol rate, the receiver decreases the symbol rate to be tested in a second step size.

Optionally, the second step is preset or set by a user.

S212. The receiver determines whether the adjusted symbol rate to be tested is within a preset symbol rate range.

It should be noted that if the adjusted symbol rate to be tested is within a preset symbol rate range, the receiver performs step S204 again to determine whether the frequency to be tested and the adjusted symbol rate to be tested are another group. Candidate channel parameters. If the adjusted symbol rate to be tested is not within the preset symbol rate range, it indicates that the receiver has completed blind scanning of the frequency band to be tested, and therefore the receiver performs the following step S213.

S213. The receiver detects whether a blind scan of the entire satellite communication frequency band has been completed.

It should be noted that if the receiver does not complete the blind scanning of the entire satellite communication frequency band, the receiver performs step S201 again, that is, the receiver performs blind scanning on the next frequency band to be tested.

In addition, during the blind scanning process, the receiver may acquire a channel according to the set of candidate channel parameters each time a set of candidate channel parameters is determined. Alternatively, after determining the plurality of sets of candidate channel parameters, the channels are acquired one by one according to the plurality of sets of candidate channel parameters.

The above step S201 can be performed by the tuner in the receiver shown in FIG. 2, and the above steps S202 to S213 can be performed by the demodulator in the receiver shown in FIG. 2, which is not used in this embodiment of the present application. Any restrictions.

As shown in FIG. 7 , a blind scanning method is provided in the embodiment of the present application, and the method is applied to a scenario in which a whole satellite communication frequency band is blindly scanned. The method comprises the following steps: S301-S313.

S301-S302, which is similar to the steps S201-S202, and the related descriptions may refer to the embodiment shown in FIG. 6. The embodiments of the present application are not described herein again.

S303. The receiver sets a frequency to be tested as an initial frequency.

S304. The receiver sets a symbol rate to be tested as an initial symbol rate.

S305-S308, which is similar to the steps S205-S208, and the related description may refer to the embodiment shown in FIG. 6, and details are not described herein again.

S309. The receiver adjusts the symbol rate to be tested in a second step.

S310. The receiver determines whether the adjusted symbol rate to be tested is within a preset symbol rate range.

It should be noted that if the adjusted symbol rate to be tested is within a preset symbol rate range, the receiver performs step S305 again to determine whether the frequency to be tested and the adjusted symbol rate to be tested are another group. Candidate channel parameters. If the adjusted symbol rate to be tested is not within the preset symbol rate range, it indicates that the receiver has completed blind scanning of the frequency band to be tested, and therefore the receiver performs the following step S311.

S311. The receiver adjusts the frequency to be tested by using a first step length.

S312. The receiver determines whether the adjusted frequency to be tested is in the frequency band to be tested.

It is to be noted that, if the adjusted frequency to be tested is in the frequency band to be tested, the receiver performs step S304 again to determine whether the measured symbol rate and the adjusted frequency to be tested are another set of candidate channels. parameter. If the adjusted frequency to be tested is not in the frequency band to be tested, it indicates that the receiver has completed blind scanning of the frequency band to be tested, and therefore the receiver performs the following step S213.

S313 is similar to the step S213, and the related description may refer to the embodiment shown in FIG. 6. The embodiments of the present application are not described herein again.

The above step S301 can be performed by the tuner in the receiver shown in FIG. 2, and the above steps S302 to S313 can be performed by the demodulator in the receiver shown in FIG. 2, which is not used in this embodiment of the present application. Any restrictions.

The solution provided by the embodiment of the present application is mainly introduced from the perspective of a receiver. It can be understood that the receiver includes corresponding hardware structures and/or software modules for performing the respective functions in order to implement the above functions. Those skilled in the art will readily appreciate that the present application can be implemented in a combination of hardware or hardware and computer software in conjunction with the receiver and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

The embodiment of the present application may divide the receiver according to the foregoing method example. For example, each module or unit may be divided according to each function, or two or more functions may be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software modules or units. The division of modules or units in the embodiments of the present application is schematic, and is only a logical function division, and may be further divided in actual implementation.

For example, in the case of dividing each functional module by corresponding functions, FIG. 8 shows a possible structural diagram of the receiver involved in the above embodiment. The receiver includes a tuning module 801 and a demodulation module 802.

a tuning module 801, configured to acquire a signal of a frequency band to be tested;

The demodulation module 802 is configured to perform the following steps S102 to S104:

S102, based on the frequency to be tested and the symbol rate to be tested, intercepting two frequency spectrums from a spectrum corresponding to the signal of the frequency band to be tested, where a center frequency of the two frequency bands is symmetric based on the frequency to be tested, the two segments The distance from the center frequency of the spectrum to the frequency to be measured is determined by the symbol rate to be tested.

S103. Determine a correlation value between the two segments of the spectrum.

S104. If the correlation value between the two segments of the spectrum is greater than a preset value, determine that the frequency to be tested and the symbol rate to be tested are a set of candidate channel parameters.

In a possible design, the demodulation module 802 is further configured to perform fast Fourier transform on the signal of the frequency band to be tested, and determine a spectrum corresponding to the signal of the frequency band to be tested.

In a possible design, the demodulation module 802 is further configured to perform the following steps S1051 to S1061:

S1061: Adjust the symbol rate to be tested, reset the frequency to be tested to an initial frequency, and perform steps S102 to S1051 again until the adjusted symbol rate to be tested exceeds a preset symbol rate range.

In a possible design, the demodulation module 802 is further configured to perform the following steps S1052 to S1062:

S1062: Adjust the frequency to be tested, reset the symbol rate to be tested to an initial symbol rate, and perform steps S102 to S1052 again until the adjusted frequency to be tested exceeds the frequency band to be tested.

In a possible design, the demodulation module 802 is further configured to increase the frequency to be tested by a first step length; or reduce the frequency to be tested by a first step length.

In a possible design, the demodulation module 802 increases the symbol rate to be tested in a second step size; or decreases the symbol rate to be tested in a second step size.

In a possible design, the demodulation module 802 is further configured to acquire a channel according to a set of candidate channel parameters.

In a possible design, the demodulation module 802 is further configured to generate an order of the plurality of candidate channel parameters according to a ranking of correlation values between two pieces of spectrum corresponding to the plurality of sets of candidate channel parameters. a sequence; according to the sorting order, acquiring channels according to the plurality of sets of candidate channel parameters one by one.

In the embodiment of the present application, the device is presented in the form of dividing each functional module corresponding to each function, or the device is presented in a form that divides each functional module in an integrated manner. A "module" herein may include an Application-Specific Integrated Circuit (ASIC), a circuit, a processor and memory that executes one or more software or firmware programs, an integrated logic circuit, or other device that can provide the above functions. . For example, the tuning module 801 of Figure 8 can be implemented by the tuner of Figure 2. The demodulation module 802 in FIG. 8 can be implemented by the demodulator in FIG. 2, which is not limited in this embodiment.

The embodiment of the present application further provides a computer readable storage medium having instructions stored therein; when the computer readable storage medium is run on the receiver shown in FIG. 2, causing the receiver to execute The blind scanning method shown in FIG. 3 to FIG. 7 of the embodiment of the present application.

Optionally, the embodiment of the present application provides a chip system, where the chip system includes a processor for supporting a receiver to implement the blind scanning method shown in FIG. 3 to FIG. 7. In one possible design, the chip system also includes a memory. This memory is used to store the necessary program instructions and data for the receiver. Of course, the memory may not be in the chip system. The chip system may be composed of a chip, and may also include a chip and other discrete devices. This embodiment of the present application does not specifically limit this.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transmission to another website site, computer, server or data center via wired (eg coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg infrared, wireless, microwave, etc.). The computer readable storage medium can be any available media that can be accessed by a computer or a data storage device that includes one or more servers, data centers, etc. that can be integrated with the media. The usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)) or the like.

Although the present application has been described herein in connection with the various embodiments, those skilled in the art can Other variations of the disclosed embodiments are achieved. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill several of the functions recited in the claims. Certain measures are recited in mutually different dependent claims, but this does not mean that the measures are not combined to produce a good effect.

While the present invention has been described in connection with the specific embodiments and embodiments thereof, various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the description and drawings are to be regarded as It will be apparent to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the present invention.

Claims

A blind scanning method, characterized in that the method comprises:

S101. Acquire a signal of a frequency band to be tested.

S102, based on the frequency to be tested and the symbol rate to be tested, intercepting two frequency spectrums from a spectrum corresponding to the signal of the frequency band to be tested, where a center frequency of the two frequency bands is symmetric based on the frequency to be tested, the two segments The distance from the center frequency of the spectrum to the frequency to be measured is determined by the symbol rate to be tested;

S103. Determine a correlation value between the two segments of the spectrum;

S104. If the correlation value between the two segments of the spectrum is greater than a preset value, determine that the frequency to be tested and the symbol rate to be tested are a set of candidate channel parameters.
The blind scanning method according to claim 1, wherein after the acquiring the signal of the frequency band to be tested, the method further comprises:

Performing a fast Fourier transform on the signal of the frequency band to be tested, and determining a spectrum corresponding to the signal of the frequency band to be tested.
The blind scanning method according to claim 1, wherein the method further comprises:

S1051, adjusting the frequency to be tested, and performing steps S102 to S104 again, until the adjusted frequency to be tested exceeds the frequency band to be tested;

S1061: Adjust the symbol rate to be tested, reset the frequency to be tested to an initial frequency, and perform steps S102 to S1051 again until the adjusted symbol rate to be tested exceeds a preset symbol rate range.
The blind scanning method according to claim 1, wherein the method further comprises:

S1052, adjusting the symbol rate to be tested, and performing steps S102 to S104 again until the adjusted symbol rate to be tested exceeds a preset symbol rate range;

S1062: Adjust the frequency to be tested, reset the symbol rate to be tested to an initial symbol rate, and perform steps S102 to S1052 again until the adjusted frequency to be tested exceeds the frequency band to be tested.
The blind scanning method according to claim 3 or 4, wherein the adjusting the frequency to be tested comprises:

Increasing the frequency to be tested by the first step length; or

The frequency to be measured is decreased by the first step length.
The blind scanning method according to claim 3 or 4, wherein the adjusting the symbol rate to be tested comprises:

Increasing the rate of the symbol to be tested in a second step; or

The symbol rate to be tested is decreased in a second step.
The method of claim 1, wherein after the determining the frequency to be tested and the rate of the symbol to be tested is a set of candidate channel parameters, the method further comprises:

A channel is acquired according to the group candidate channel parameter.
The blind scanning method according to claim 3 or 4, wherein the method further comprises:

For a plurality of sets of candidate channel parameters, a sort order of the plurality of sets of candidate channel parameters is generated according to a sorting of correlation values between the two pieces of spectrum corresponding to the plurality of sets of candidate channel parameters;

According to the sorting order, the channels are acquired one by one according to the plurality of sets of candidate channel parameters.
A blind scanning device, characterized in that the device comprises:

a tuning module for acquiring a signal of a frequency band to be tested;

The demodulation module is configured to perform the following steps S102 to S104:

S102, based on the frequency to be tested and the symbol rate to be tested, intercepting two frequency spectrums from a spectrum corresponding to the signal of the frequency band to be tested, where a center frequency of the two frequency bands is symmetric based on the frequency to be tested, the two segments The distance from the center frequency of the spectrum to the frequency to be measured is determined by the symbol rate to be tested;

S103. Determine a correlation value between the two segments of the spectrum;

S104. If the correlation value between the two segments of the spectrum is greater than a preset value, determine that the frequency to be tested and the symbol rate to be tested are a set of candidate channel parameters.
The blind scanning device according to claim 9, wherein the demodulation module is further configured to perform fast Fourier transform on the signal of the frequency band to be tested, and determine a spectrum corresponding to the signal of the frequency band to be tested. .
The blind scanning device according to claim 9, wherein the demodulation module is further configured to perform the following steps S1051 to S1061:

S1051, adjusting the frequency to be tested, and performing steps S102 to S104 again, until the adjusted frequency to be tested exceeds the frequency band to be tested;

S1061: Adjust the symbol rate to be tested, reset the frequency to be tested to an initial frequency, and perform steps S102 to S1051 again until the adjusted symbol rate to be tested exceeds a preset symbol rate range.
The blind scanning device according to claim 9, wherein the demodulation module is further configured to perform the following steps S1052 to S1062:

S1052, adjusting the symbol rate to be tested, and performing steps S102 to S104 again until the adjusted symbol rate to be tested exceeds a preset symbol rate range;

S1062: Adjust the frequency to be tested, reset the symbol rate to be tested to an initial symbol rate, and perform steps S102 to S1052 again until the adjusted frequency to be tested exceeds the frequency band to be tested.
The blind scanning device according to claim 11 or 12, wherein the demodulation module is further configured to increase the frequency to be tested by a first step length; or Frequency to be tested.
The blind scanning device according to claim 11 or 12, wherein the demodulation module increases the symbol rate to be tested in a second step size; or decreases the to-be-tested unit in a second step size Symbol rate.
The blind scanning device according to claim 9, wherein the demodulation module is further configured to acquire a channel according to a set of candidate channel parameters.
The blind scanning device according to claim 11 or 12, wherein the demodulation module is further configured to generate a correlation value between two pieces of spectrum corresponding to the plurality of sets of candidate channel parameters from large to small. a sorting order of the plurality of sets of candidate channel parameters; obtaining channels according to the plurality of sets of candidate channel parameters one by one according to the sorting order.