CN110417493B - Blind scanning method and device - Google Patents
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Abstract
A blind scanning method relates to the technical field of communication and is used for solving the problem that the prior art is not suitable for rapidly and blindly scanning DVB-S2X satellite signals. The method comprises the following steps: a receiver acquires a signal of a frequency band to be detected; intercepting two sections of frequency spectrums from the frequency spectrum corresponding to the signal of the frequency band to be detected based on the frequency to be detected and the symbol rate to be detected, wherein the two sections of frequency spectrums are symmetrical based on the central frequency of the frequency to be detected, and the distance from the central frequency of the two sections of frequency spectrums to the frequency to be detected is determined by the symbol rate to be detected; then, calculating a correlation value between the two sections of frequency spectrums; and if the correlation value between the two sections of frequency spectrums is larger than a preset value, determining the frequency to be measured and the symbol rate to be measured as a group of candidate channel parameters. The application is suitable for the blind scanning process.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a blind scanning method and apparatus.
Background
The satellite television receives a satellite signal according to channel parameters such as frequency and symbol rate (symbol rate) of the satellite signal, so that a television program corresponding to the satellite signal can be played. So-called blind scan, in which the satellite television does not know the channel parameters of the satellite signal, the receiver of the satellite television automatically searches for the correct channel parameters in the designated frequency range.
In the conventional blind scanning method, a receiver of a satellite television first determines a center frequency and attempts convergence on a signal of a minimum symbol rate by using a filter bank using a timing recovery loop. If the timing recovery loop converges, the corresponding center frequency and symbol rate are determined to be the channel parameters of the satellite signal. The filter bank is then adjusted to expand the symbol rate and a timing recovery loop convergence attempt is made again. When the symbol rate exceeds the maximum possible value, the center frequency is changed, and the searching process is repeated from the minimum symbol rate until the searching of all frequency bands is completed. The blind scanning method for circularly searching channel parameters by using the timing recovery loop is low in efficiency because the possible symbol frequency range of the satellite signal is large, the signal frequency range is wide, and the convergence of the timing recovery loop also needs a long time.
In order to improve the efficiency of blind scanning, another blind scanning method is proposed in the prior art: the receiver of the satellite television analyzes the energy of the signal spectrum in a frequency range, and if the energy accumulation of the signal spectrum exceeds a set threshold value, the central frequency and the symbol rate corresponding to the signal spectrum are determined as a group of candidate channel parameters; a convergence attempt is then made using the timing recovery loop on the signal determined by the set of candidate channel parameters to lock onto the channel. The method has good searching capability for satellite signals with high signal-to-noise ratio threshold and obvious spectrum roll-off. However, in the third generation Digital Satellite Broadcasting system standard (DVB-S2X), the signal-to-noise threshold of the Satellite signal is low (the signal-to-noise threshold is at least-3 dB). Therefore, for the satellite signal of DVB-S2X, the blind scanning method cannot accurately determine the corresponding candidate channel parameters, and thus cannot successfully lock the corresponding channel.
Disclosure of Invention
The application provides a blind scanning method and a blind scanning device, which are used for solving the problem that the prior art is not suitable for rapidly and blindly scanning a satellite signal of DVB-S2X.
In order to achieve the purpose, the application provides the following technical scheme:
in a first aspect, a blind scanning method comprises the steps of:
s101, obtaining a signal of a frequency band to be measured.
S102, based on the frequency to be measured and the symbol rate to be measured, intercepting two sections of frequency spectrums from the frequency spectrums corresponding to the signals of the frequency range to be measured, wherein the center frequencies of the two sections of frequency spectrums are symmetrical based on the frequency to be measured, and the distance from the center frequencies of the two sections of frequency spectrums to the frequency to be measured is determined by the symbol rate to be measured.
And S103, determining a correlation value between the two sections of frequency spectrums.
And S104, if the correlation value between the two sections of frequency spectrums is larger than a preset value, determining the frequency to be measured and the symbol rate to be measured as a group of candidate channel parameters.
As shown in fig. 1, in the spectrum of the satellite signal, the spectrum at the roll-off edges on both sides is symmetrical, that is, the spectrum at the roll-off edges on both sides has correlation characteristics. Therefore, in the technical scheme of the application, the receiver intercepts two sections of frequency spectrums from the frequency spectrum corresponding to the signal of the frequency band to be detected based on the frequency to be detected and the symbol rate to be detected, and determines a correlation value between the two sections of frequency spectrums, thereby judging whether the two sections of frequency spectrums are the frequency spectrums at the roll-off edges on the two sides in the frequency spectrum of the satellite signal. If the correlation values of the two sections of frequency spectrums are larger than the preset value, the two sections of frequency spectrums are probably frequency spectrums at the roll-off edges on the two sides in the frequency spectrum of the satellite signal, and therefore the frequency to be measured and the symbol rate to be measured are probably corresponding to satellite information. Thus, the receiver determines the frequency to be measured and the symbol rate to be measured as a set of candidate channel parameters. It can be understood that the spectrum of the satellite signal with the low snr threshold has the relevant characteristics at both roll-off edges in the spectrum. Therefore, the technical scheme of the application can be suitable for the satellite signal with the low signal-to-noise ratio threshold, so that the problem that the prior art is not suitable for rapidly and blindly scanning the satellite signal of DVB-S2X is solved.
In one possible design, after acquiring the signal of the frequency band to be measured, the method further includes: and performing fast Fourier transform on the signal of the frequency band to be detected, and determining the frequency spectrum corresponding to the signal of the frequency band to be detected.
In one possible design, the method further includes: s1051, adjusting the frequency to be measured, and re-executing the steps S102 to S104 until the adjusted frequency to be measured exceeds the frequency band to be measured. And S1061, adjusting the symbol rate to be measured, resetting the frequency to be measured to the initial frequency, and re-executing the steps S102 to S1051 until the adjusted symbol rate to be measured exceeds the preset symbol rate range. Based on the technical scheme, the receiver can determine all candidate channel parameters in the frequency band to be detected.
In one possible design, the method further includes: and S1052, adjusting the symbol rate to be measured, and re-executing the steps S102 to S104 until the adjusted symbol rate to be measured exceeds a preset symbol rate range. And S1062, adjusting the frequency to be measured, resetting the symbol rate to be measured to the initial symbol rate, and re-executing the steps S102 to S1052 until the adjusted frequency to be measured exceeds the frequency band to be measured. Based on the technical scheme, the receiver can determine all candidate channel parameters in the frequency band to be detected.
Optionally, the adjusting the frequency to be measured includes: increasing the frequency to be measured by the first step length; alternatively, the frequency to be measured is reduced by a first step size.
Optionally, the adjusting the rate of the symbol to be measured includes: increasing the rate of the symbol to be measured by the second step length; alternatively, the symbol rate to be measured is reduced by a second step size.
In an alternative implementation, after determining the frequency to be measured and the symbol rate to be measured as a set of candidate channel parameters, the method further includes: based on the set of candidate channel parameters, a channel is acquired. In this way, the receiver can lock the channel and extract the program information of the channel, so that the user can watch the program conveniently.
In an optional implementation manner, the method further includes: for a plurality of groups of candidate channel parameters, generating a sorting sequence of the plurality of groups of candidate channel parameters according to the sorting of the correlation values between two sections of frequency spectrums corresponding to the plurality of groups of candidate channel parameters from large to small; and acquiring channels according to the sorting sequence and the multiple groups of candidate channel parameters one by one. Based on the above technical solution, the larger the correlation value between the two sections of frequency spectrums corresponding to a group of candidate channel parameters is, the more likely the group of candidate channel parameters corresponds to a channel, so that the receiver acquires a channel according to a group of candidate channel parameters with a higher probability, which is beneficial for the receiver to lock to the channel as soon as possible.
In a second aspect, a blind scanning device, the device comprising: a tuning module and a demodulation module.
And the tuning module is used for acquiring the signal of the frequency band to be measured.
A demodulation module for executing the following steps S102 to S104:
s102, based on the frequency to be measured and the symbol rate to be measured, intercepting two sections of frequency spectrums from the frequency spectrums corresponding to the signals of the frequency range to be measured, wherein the center frequencies of the two sections of frequency spectrums are symmetrical based on the frequency to be measured, and the distance from the center frequencies of the two sections of frequency spectrums to the frequency to be measured is determined by the symbol rate to be measured.
And S103, determining a correlation value between the two sections of frequency spectrums.
And S104, if the correlation value between the two sections of frequency spectrums is larger than a preset value, determining the frequency to be measured and the symbol rate to be measured as a group of candidate channel parameters.
In one possible design, the demodulation module is further configured to perform fast fourier transform on the signal in the frequency band to be detected, and determine a frequency spectrum corresponding to the signal in the frequency band to be detected.
In one possible design, the demodulation module is further configured to perform the following steps S1051 to S1061:
s1051, adjusting the frequency to be measured, and re-executing the steps S102 to S104 until the adjusted frequency to be measured exceeds the frequency band to be measured.
And S1061, adjusting the symbol rate to be measured, resetting the frequency to be measured to the initial frequency, and re-executing the steps S102 to S1051 until the adjusted symbol rate to be measured exceeds the preset symbol rate range.
In one possible design, the demodulation module is further configured to perform the following steps S1052 to S1062:
and S1052, adjusting the symbol rate to be measured, and re-executing the steps S102 to S104 until the adjusted symbol rate to be measured exceeds a preset symbol rate range.
And S1062, adjusting the frequency to be measured, resetting the symbol rate to be measured to the initial symbol rate, and re-executing the steps S102 to S1052 until the adjusted frequency to be measured exceeds the frequency band to be measured.
In one possible design, the demodulation module is further configured to increase the frequency to be measured by a first step size; alternatively, the frequency to be measured is reduced by a first step size.
In one possible design, the demodulation module increases the rate of the symbol to be measured by a second step size; alternatively, the symbol rate to be measured is reduced by a second step size.
In one possible design, the demodulation module is further configured to acquire a channel according to a set of candidate channel parameters.
In one possible design, the demodulation module is further configured to generate a ranking order of the multiple sets of candidate channel parameters according to a ranking of correlation values between two sections of frequency spectrums corresponding to the multiple sets of candidate channel parameters from large to small; and acquiring channels according to the sorting sequence and the multiple groups of candidate channel parameters one by one.
In a third aspect, a receiver is provided, where the receiver has a function of implementing the blind scanning method of any one of the first aspect. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.
In a fourth aspect, there is provided a receiver comprising: a processor, a memory, a bus, and a communication interface; the memory is configured to store computer executable instructions, and the processor is connected to the memory through the bus, and when the receiver is running, the processor executes the computer executable instructions stored in the memory, so as to enable the receiver to perform the blind scanning method according to any one of the first aspect.
In a fifth aspect, a receiver is provided, including: a processor; the processor is configured to be coupled to the memory, and after reading the instructions in the memory, cause the receiver to perform the blind scanning method according to any one of the above first aspect.
In a sixth aspect, a computer-readable storage medium is provided, which has instructions stored therein, which when run on a computer, make the computer perform the blind scanning method of any one of the above first aspects.
In a seventh aspect, there is provided a computer program product containing instructions which, when run on a computer, enable the computer to perform the blind scanning method of any one of the above first aspects.
In an eighth aspect, a chip system is provided, which includes a processor for enabling a receiver to implement the functions recited in the first aspect. In one possible design, the system-on-chip further includes a memory for storing program instructions and data necessary for the network device. The chip system may be constituted by a chip, or may include a chip and other discrete devices.
For technical effects brought by any one of the design manners in the second aspect to the eighth aspect, reference may be made to technical effects brought by different design manners in the first aspect, and details are not described herein.
Drawings
FIG. 1 is a schematic diagram of a spectrum of a satellite signal;
fig. 2 is a schematic structural diagram of a receiver according to an embodiment of the present disclosure;
fig. 3 is a first flowchart of a blind scanning method according to an embodiment of the present disclosure;
fig. 4 is a flowchart of a blind scanning method according to an embodiment of the present application;
fig. 5 is a flowchart three of a blind scanning method according to an embodiment of the present application;
fig. 6 is a fourth flowchart of a blind scanning method according to an embodiment of the present disclosure;
fig. 7 is a flowchart of a blind scanning method according to an embodiment of the present application;
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 the present application are only for distinguishing different objects, and do not limit the order thereof. For example, the first step size and the second step size are only used for distinguishing different step sizes, and the sequence order of the step sizes is not limited.
The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.
It is noted that, in the present application, words such as "exemplary" or "for example" are used to mean exemplary, illustrative, or descriptive. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
Fig. 2 is a schematic structural diagram of a receiver according to an embodiment of the present application. The receiver includes: an antenna 11, a tuner 12, and a demodulator 13.
The antenna 11 is used for receiving signals.
A tuner 12 for selecting a frequency band signal from the signals received by the antenna.
A demodulator 13 for demodulating the signal of the frequency band selected by the tuner.
In an optional implementation manner, the receiver may further include at least one of the following components: power components, a demultiplexer, an audio decoder, a video decoder, a memory, and a processor.
Wherein the power supply component is used to power other components of the receiver.
The demultiplexer includes a transport stream demultiplexer and a program stream demultiplexer. The transport stream demultiplexer is used for decomposing a transport stream carrying multiple program signals into multiple program streams carrying only one program signal. The program stream multiplexer is used to decompose the program stream into elementary streams containing only audio, video and transport data.
The video decoder is used for decompressing the video data.
The audio decoder is used for decompressing the audio data.
The processor may be a 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 of dynamic storage device that can store information and instructions, an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these. The memory may be self-contained and coupled to the processor via a bus. The memory may also be integral to the processor.
Fig. 3 is a flowchart of a blind scanning method according to an embodiment of the present application. The blind scanning method provided by the embodiment of the application is suitable for blind scanning satellite signals of different standards, and the standards include but are not limited to: the first generation Digital Satellite Broadcasting system standard (Digital Video Broadcasting-Satellite, DVB-S), the second generation Digital Satellite Broadcasting system standard (Digital Video Broadcasting-Satellite 2, DVB-S2), DVB-S2X. The method comprises the following steps:
s101, the receiver acquires signals of a frequency range to be measured.
And the frequency band to be detected belongs to a satellite communication frequency band. Optionally, the frequency band to be measured is a part of the satellite communication frequency band, or the frequency band to be measured is the whole satellite communication frequency band. Illustratively, the preset frequency band is 30 to 31 GHZ.
Optionally, after the signal of the frequency band to be detected is obtained, the receiver performs fast fourier transform on the signal of the frequency band to be detected, and determines a frequency spectrum corresponding to the signal of the frequency band to be detected. It should be noted that the receiver may also determine the frequency spectrum corresponding to the signal of the frequency band to be measured by using other implementation manners, which is not limited in this embodiment of the present application.
S102, the receiver intercepts two sections of frequency spectrums from the frequency spectrums corresponding to the signals of the frequency range to be detected based on the frequency to be detected and the symbol rate to be detected.
The center frequencies of the two sections of frequency spectrums are symmetrical based on the frequency to be measured, and the distance between the center frequencies of the two sections of frequency spectrums and the frequency to be measured is determined by the symbol rate to be measured.
Optionally, the two sections of spectrum are equal in bandwidth. Alternatively, the bandwidths of the two segments of spectrum are not equal. The bandwidths of the two frequency spectrums are preset or determined according to the first to-be-detected symbol rate. If the bandwidths of the two sections of frequency spectrums are determined according to the first to-be-detected symbol rate, the bandwidths of the two sections of frequency spectrums are positively correlated with the first to-be-detected symbol rate. That is, the larger the first symbol rate to be measured, the larger the bandwidth of the two sections of spectrum.
S103, the receiver determines a correlation value between the two sections of frequency spectrums.
Step S103 may refer to the prior art, and is not described herein again in this embodiment.
And S104, if the correlation value between the two sections of frequency spectrums is larger than a preset value, the receiver determines the frequency to be detected and the symbol rate to be detected as a group of candidate channel parameters.
It should be noted that, if the correlation values of the two sections of frequency spectrums are greater than the preset value, it is indicated that the symbol rate to be measured and the frequency to be measured have great possibility to correspond to a satellite signal, so that the receiver can determine that the symbol rate to be measured and the frequency to be measured are a set of candidate channel parameters. If the correlation value of the two sections of frequency spectrums is less than or equal to the preset value, the probability that the symbol rate to be detected and the frequency to be detected correspond to a satellite signal is very low, and therefore the receiver does not determine the symbol rate to be detected and the frequency to be detected as a group 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 a frequency band according to the set of candidate channel parameters, and performs a convergence attempt on the signal of the frequency band by using a timing recovery loop. If the timing recovery loop does not converge within the preset time, it indicates that there is no corresponding channel in the set of candidate channel parameters. If the timing recovery loop converges within the preset time, it indicates that the set of candidate channel parameters has a corresponding channel, so that the receiver locks the channel and extracts the program information of the channel, so as to facilitate the user to watch the program.
The step S101 may be performed by the tuner shown in fig. 2, and the steps S102 to S104 may be performed by the demodulator in the receiver shown in fig. 2, which is not limited in this embodiment of the application.
In order to determine all candidate channel parameters on the frequency band to be measured, as shown in fig. 4, an embodiment of the present application provides a blind scanning method, and after step S104, the method further includes the following steps:
s1051, the receiver adjusts the frequency to be measured, and executes the steps S102 to S104 again until the adjusted frequency to be measured exceeds the frequency band to be measured.
Optionally, the adjusting the frequency to be measured includes, but is not limited to, the following implementation manners: and increasing the frequency to be measured by a first step length, or decreasing the frequency to be measured by the first step length.
Optionally, the first step size is preset or set by a user.
In an optional implementation manner, the receiver adjusts the frequency to be detected, and then detects whether the adjusted frequency to be detected exceeds the frequency band to be detected; if the adjusted frequency to be measured does not exceed the frequency band to be measured, the receiver re-executes steps S102 to S04. If the adjusted frequency to be measured exceeds the frequency band to be measured, the receiver executes the following step S1061.
And S1061, adjusting the symbol rate to be measured by the receiver, resetting the frequency to be measured to the initial frequency, and re-executing the steps S102 to S1051 until the adjusted symbol rate to be measured exceeds a preset symbol frequency range.
The initial frequency is the minimum frequency of the frequency band to be detected, or the maximum frequency of the frequency band to be detected.
Optionally, the adjusting the symbol rate to be measured includes, but is not limited to, the following implementation manners: and increasing the symbol rate to be detected by a second step length, or decreasing the symbol rate to be detected by the second step length.
Optionally, the second step size is preset or set by a user.
In an optional implementation manner, the receiver adjusts the symbol rate to be detected, and then detects whether the adjusted symbol rate to be detected exceeds a preset symbol rate range. If the adjusted symbol rate to be measured does not exceed the preset symbol rate range, the receiver resets the frequency to be measured to the initial frequency, and re-executes the steps S102 to S1051. And if the adjusted symbol rate to be measured exceeds the preset symbol rate range, the receiver finishes the blind scanning process of the frequency band to be measured.
Optionally, in the blind scanning process, when a group of candidate channel parameters is determined, the receiver acquires a channel according to the group of candidate channel parameters.
Or after determining multiple groups of candidate channel parameters, the receiver acquires channels one by one according to the multiple groups of candidate channel parameters. It is understood that the larger the correlation value between two sections of spectrum corresponding to a set of candidate channel parameters, the more likely the set of candidate channel parameters corresponds to a channel. Therefore, in order to quickly acquire channels, for a plurality of groups of candidate channel parameters, the receiver firstly generates a sorting sequence of the plurality of groups of candidate channel parameters according to the descending sorting of two sections of frequency spectrums corresponding to the plurality of groups of candidate channel parameters; and then, the receiver acquires channels one by one according to the multiple groups of candidate channel parameters according to the sorting sequence.
For example, the receiver determines a group a candidate channel parameter, a group B candidate channel parameter, and a group C candidate channel parameter, and A, B, C the correlation values between the two frequency spectrums corresponding to the three groups of candidate channel parameters are: 0.5, 0.7 and 0.6. Therefore, according to the order of the correlation values from large to small, the three sets of candidate channel parameters can be determined to have the ordering order: group B candidate channel parameters, group C candidate channel parameters, and group A candidate channel parameters. In this case, the receiver first acquires the channel according to the B sets of candidate channel parameters. Then, the receiver acquires the channel according to the C group of candidate channel parameters. And finally, the receiver acquires the channel according to the A group of candidate channel parameters.
The above steps S1051 and S1061 may be performed by a demodulator in the receiver shown in fig. 2, which is not limited in this embodiment of the application.
In order to determine all candidate channel parameters on the frequency band to be measured, as shown in fig. 5, an embodiment of the present application provides a blind scanning method, and after step S104, the method further includes the following steps:
and S1052, the receiver adjusts the symbol rate to be measured, and re-executes the steps S102 to S104 until the adjusted symbol rate to be measured exceeds a preset symbol rate range.
In an optional implementation manner, the receiver adjusts the symbol rate to be detected, and then detects whether the adjusted symbol rate to be detected exceeds a preset symbol rate range. If the adjusted symbol rate to be measured does not exceed the preset symbol rate range, the receiver re-executes steps S102 to S104. If the adjusted symbol rate to be measured exceeds the preset symbol rate range, the receiver performs the following step S1062.
S1062, the receiver adjusts the frequency to be measured, resets the symbol rate to be measured to the initial symbol rate, and re-executes the steps S102 to S1052 until the adjusted frequency to be measured exceeds the frequency band to be measured.
Wherein 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 measured, and then detects whether the adjusted frequency to be measured exceeds the frequency band to be measured. If the adjusted frequency to be measured does not exceed the frequency band to be measured, the receiver resets the symbol rate to be measured to the initial symbol rate, and executes steps S102 to S1052 again. And if the adjusted frequency to be measured exceeds the frequency band to be measured, the receiver finishes the blind scanning process of the frequency band to be measured.
Optionally, in the blind scanning process, when a group of candidate channel parameters is determined, the receiver acquires a channel according to the group of candidate channel parameters. Or after determining multiple groups of candidate channel parameters, the receiver acquires channels one by one according to the multiple groups of candidate channel parameters.
The above steps S1052 and S1062 may be performed by a demodulator in the receiver shown in fig. 2, which is not limited in this embodiment.
Currently, a tuner of a receiver can only acquire signals of a frequency band with a certain bandwidth, in other words, the tuner cannot acquire signals of the whole satellite communication frequency band. Therefore, the receiver can only divide the whole satellite communication frequency band into a plurality of frequency bands to be detected, and perform blind scanning on the plurality of frequency bands to be detected one by one so as to complete the blind scanning on the whole satellite communication frequency band.
As shown in fig. 6, a blind scanning method provided in this embodiment of the present application is applied to a scene in which a whole satellite communication frequency band is blindly scanned. The method comprises the following steps: S201-S213.
S201, the receiver acquires signals of a frequency range to be measured.
S202, the receiver determines a frequency spectrum corresponding to the signal of the frequency range to be measured.
S203, the receiver sets the symbol rate to be measured as the initial symbol rate.
Wherein the initial symbol rate is a minimum symbol rate or a maximum symbol rate.
And S204, setting the frequency to be measured as the initial frequency by the receiver.
The initial frequency is the minimum frequency of the frequency band to be detected, or the maximum frequency of the frequency band to be detected.
S205, the receiver intercepts two sections of frequency spectrums from the frequency spectrums corresponding to the signals of the frequency range to be detected according to the frequency to be detected and the symbol rate to be detected.
S206, the receiver determines a correlation value between two sections of frequency spectrums.
S207, the receiver detects whether the correlation value between the two sections of frequency spectrums is larger than a preset value.
It should be noted that, if the correlation value between the two frequency spectrums is greater than a preset value, the receiver performs the following step S208. If the correlation value between the two sections of frequency spectrums is less than or equal to the preset value, the receiver executes the following step S209.
S208, the receiver determines the frequency to be measured and the symbol rate to be measured as a group of candidate channel parameters.
And S209, the receiver adjusts the frequency to be measured according to the first step length.
Referring to step S204, when the initial frequency is the minimum frequency of the frequency band to be measured, the receiver increases the frequency to be measured by the first step length. Or, when the initial frequency is the maximum frequency of the frequency band to be measured, the receiver reduces the frequency to be measured by a first step length.
S210, the receiver judges whether the adjusted frequency to be measured is in the frequency band to be measured.
It should be noted that, if the adjusted frequency to be measured is in the frequency band to be measured, the receiver re-executes step S205 to determine whether the symbol rate to be measured and the adjusted frequency to be measured are another set of candidate channel parameters. If the adjusted frequency to be measured is not in the frequency band to be measured, the receiver performs the following step S211.
And S211, the receiver adjusts the rate of the symbol to be measured according to a second step length.
With reference to step S203, if the initial symbol rate is the minimum symbol rate, the receiver increases the symbol rate to be measured by a second step length. Or, if the initial symbol rate is the maximum symbol rate, the receiver reduces the symbol rate to be measured by a second step length.
Optionally, the second step size is preset or set by a user.
S212, the receiver judges whether the adjusted symbol rate to be measured is in a preset symbol rate range.
It should be noted that, if the adjusted symbol rate to be measured is within the preset symbol rate range, the receiver re-executes step S204 to determine whether the frequency to be measured and the adjusted symbol rate to be measured are another set of candidate channel parameters. If the adjusted symbol rate to be measured is not within the preset symbol rate range, it indicates that the receiver has finished blind scanning the frequency band to be measured, so the receiver performs the following step S213.
S213, the receiver detects whether blind scanning of the whole satellite communication frequency band is finished.
It should be noted that, if the receiver does not perform blind scanning on 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 measured.
In addition, in the blind scanning process, the receiver may acquire a channel according to a set of candidate channel parameters when determining the set of candidate channel parameters. Or after determining multiple sets of candidate channel parameters, acquiring channels one by one according to the multiple sets of candidate channel parameters.
The step S201 may be performed by a tuner in the receiver shown in fig. 2, and the steps S202 to S213 may be performed by a demodulator in the receiver shown in fig. 2, which is not limited in this embodiment of the application.
As shown in fig. 7, a blind scanning method provided in this embodiment of the present application is applied to a scene in which a whole satellite communication frequency band is blindly scanned. The method comprises the following steps: S301-S313.
S301 to S302 are similar to steps S201 to S202, and the related description may refer to the embodiment shown in fig. 6, which is not repeated herein.
And S303, setting the frequency to be measured as the initial frequency by the receiver.
S304, the receiver sets the symbol rate to be measured as the initial symbol rate.
S305-S308 are similar to steps S205-S208, and the related description thereof can refer to the embodiment shown in fig. 6, which is not repeated herein.
S309, the receiver adjusts the symbol rate to be measured according to the second step length.
S310, the receiver judges whether the adjusted symbol rate to be measured is in a preset symbol rate range.
It should be noted that, if the adjusted symbol rate to be measured is within the preset symbol rate range, the receiver re-executes step S305 to determine whether the frequency to be measured and the adjusted symbol rate to be measured are another set of candidate channel parameters. If the adjusted symbol rate to be measured is not within the preset symbol rate range, it indicates that the receiver has finished blind scanning the frequency band to be measured, so the receiver performs the following step S311.
And S311, the receiver adjusts the frequency to be measured according to the first step length.
S312, the receiver judges whether the adjusted frequency to be measured is in the frequency band to be measured.
It should be noted that, if the adjusted frequency to be measured is in the frequency band to be measured, the receiver re-executes step S304 to determine whether the symbol rate to be measured and the adjusted frequency to be measured are another set of candidate channel parameters. If the adjusted frequency to be measured is not in the frequency band to be measured, it indicates that the receiver has finished the blind scanning of the frequency band to be measured, so the receiver performs the following step S213.
S313, similar to step S213, the related description may refer to the embodiment shown in fig. 6, and the description of the embodiment of the present application is not repeated herein.
The step S301 may be performed by a tuner in the receiver shown in fig. 2, and the steps S302 to S313 may be performed by a demodulator in the receiver shown in fig. 2, which is not limited in this embodiment of the application.
The scheme provided by the embodiment of the present application is mainly introduced from the perspective of the receiver. It will be appreciated that the receiver, in order to carry out the above-described functions, comprises corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the various illustrative receivers and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiment of the present application, the receiver may be divided according to the above method example, for example, each module or unit may be divided corresponding to each function, or two or more functions may be integrated in one processing module. The integrated module may be implemented in the form of hardware, or may be implemented in the form of a software module or unit. The division of the modules or units in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner 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 measured;
a demodulation module 802, configured to perform the following steps S102 to S104:
s102, intercepting two sections of frequency spectrums from the frequency spectrums corresponding to the signals of the frequency range to be detected based on the frequency to be detected and the symbol rate to be detected, wherein the central frequencies of the two sections of frequency spectrums are symmetrical based on the frequency to be detected, and the distance from the central frequencies of the two sections of frequency spectrums to the frequency to be detected is determined by the symbol rate to be detected.
S103, determining a correlation value between the two sections of frequency spectrums.
And S104, if the correlation value between the two sections of frequency spectrums is larger than a preset value, determining the frequency to be detected and the symbol rate to be detected as a group of candidate channel parameters.
In a possible design, the demodulation module 802 is further configured to perform fast fourier transform on the signal in the frequency band to be detected, and determine a frequency spectrum corresponding to the signal in the frequency band to be detected.
In one possible design, the demodulation module 802 is further configured to perform the following steps S1051 to S1061:
s1051, adjusting the frequency to be measured, and re-executing the steps S102 to S104 until the adjusted frequency to be measured exceeds the frequency band to be measured.
And S1061, adjusting the symbol rate to be measured, resetting the frequency to be measured to the initial frequency, and re-executing the steps S102 to S1051 until the adjusted symbol rate to be measured exceeds a preset symbol rate range.
In one possible design, the demodulation module 802 is further configured to perform the following steps S1052 to S1062:
and S1052, adjusting the symbol rate to be measured, and re-executing the steps S102 to S104 until the adjusted symbol rate to be measured exceeds a preset symbol rate range.
S1062, adjusting the frequency to be measured, resetting the symbol rate to be measured to the initial symbol rate, and re-executing the steps S102 to S1052 until the adjusted frequency to be measured exceeds the frequency band to be measured.
In one possible design, the demodulation module 802 is further configured to increase the frequency to be measured by a first step size; or reducing the frequency to be measured by a first step length.
In one possible design, the demodulation module 802 increases the rate of the symbol to be measured by a second step; or, reducing the symbol rate to be measured by a second step size.
In one possible design, the demodulation module 802 is further configured to acquire a channel according to a set of candidate channel parameters.
In one possible design, the demodulation module 802 is further configured to generate a ranking order of the multiple sets of candidate channel parameters according to a ranking from large to small of correlation values between two sections of frequency spectrums corresponding to the multiple sets of candidate channel parameters; and acquiring channels according to the sorting sequence and the multiple groups of candidate channel parameters one by one.
In the embodiment of the present application, the apparatus is presented in a form of dividing each functional module corresponding to each function, or in a form of dividing each functional module in an integrated manner. A "module" herein may include an Application-Specific Integrated Circuit (ASIC), an electronic Circuit, a processor and memory that execute one or more software or firmware programs, an Integrated logic Circuit, or other devices that provide the described functionality. For example, the tuning module 801 in fig. 8 may be implemented by the tuner in fig. 2. The demodulation module 802 in fig. 8 may be implemented by the demodulator in fig. 2, and the embodiment of the present application does not limit this.
An embodiment of the present application further provides a computer-readable storage medium, in which instructions are stored; when the computer readable storage medium is run on the receiver shown in fig. 2, the receiver is caused to perform the blind scanning method shown in fig. 3 to fig. 7 in the embodiments of the present application.
Optionally, an embodiment of the present application provides a chip system, where the chip system includes a processor, and is configured to support a receiver to implement the blind scanning method shown in fig. 3 to fig. 7. In one possible design, the system-on-chip further includes a memory. The memory is used for storing program instructions and data necessary for the receiver. Of course, the memory may not be in the system-on-chip. The chip system may be formed by a chip, and may also include a chip and other discrete devices, which is not specifically limited in this embodiment of the present application.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented using a software program, 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. The procedures or functions described in accordance with the embodiments of the present application are all or partially generated upon loading and execution of computer program instructions on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or can comprise one or more data storage devices, such as a server, a data center, etc., that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (16)
1. A method of blind scanning, the method comprising:
s101, acquiring a signal of a frequency band to be detected;
s102, intercepting two sections of frequency spectrums from frequency spectrums corresponding to signals of the frequency range to be detected based on frequency to be detected and symbol rate to be detected, wherein the center frequencies of the two sections of frequency spectrums are symmetrical based on the frequency to be detected, the distance between the center frequencies of the two sections of frequency spectrums and the frequency to be detected is determined by the symbol rate to be detected, and the bandwidths of the two sections of frequency spectrums are preset or determined according to the symbol rate to be detected;
s103, determining a correlation value between the two sections of frequency spectrums;
and S104, if the correlation value between the two sections of frequency spectrums is larger than a preset value, determining the frequency to be detected and the symbol rate to be detected as a group of candidate channel parameters.
2. The method according to claim 1, wherein after the obtaining of the signal of the frequency band to be measured, the method further comprises:
and performing fast Fourier transform on the signal of the frequency band to be detected, and determining a frequency spectrum corresponding to the signal of the frequency band to be detected.
3. The method of claim 1, further comprising:
s1051, adjusting the frequency to be measured, and re-executing the steps S102 to S104 until the adjusted frequency to be measured exceeds the frequency band to be measured;
and S1061, adjusting the symbol rate to be measured, resetting the frequency to be measured to the initial frequency, and re-executing the steps S102 to S1051 until the adjusted symbol rate to be measured exceeds a preset symbol rate range.
4. The method of claim 1, further comprising:
s1052, adjusting the symbol rate to be measured, and re-executing the steps S102 to S104 until the adjusted symbol rate to be measured exceeds a preset symbol rate range;
s1062, adjusting the frequency to be measured, resetting the symbol rate to be measured to the initial symbol rate, and re-executing the steps S102 to S1052 until the adjusted frequency to be measured exceeds the frequency band to be measured.
5. The method of claim 3 or 4, wherein said adjusting said frequency to be measured comprises:
increasing the frequency to be measured by a first step length; or,
reducing the frequency to be measured by a first step length.
6. The method of claim 3 or 4, wherein the adjusting the symbol rate to be measured comprises:
increasing the rate of the symbol to be detected by a second step length; or,
and reducing the speed of the symbol to be measured by a second step length.
7. The method of claim 1, wherein after said determining that the frequency under test and the symbol rate under test are a set of candidate channel parameters, the method further comprises:
based on the set of candidate channel parameters, a channel is acquired.
8. The method according to claim 3 or 4, characterized in that the method further comprises:
for a plurality of groups of candidate channel parameters, generating a sorting sequence of the plurality of groups of candidate channel parameters according to a sorting sequence of correlation values between two sections of frequency spectrums corresponding to the plurality of groups of candidate channel parameters from large to small;
and acquiring channels according to the sorting sequence and the multiple groups of candidate channel parameters one by one.
9. A blind scanning device, comprising:
the tuning module is used for acquiring a signal of a frequency band to be measured;
a demodulation module for executing the following steps S102 to S104:
s102, intercepting two sections of frequency spectrums from frequency spectrums corresponding to signals of the frequency range to be detected based on frequency to be detected and symbol rate to be detected, wherein the center frequencies of the two sections of frequency spectrums are symmetrical based on the frequency to be detected, the distance between the center frequencies of the two sections of frequency spectrums and the frequency to be detected is determined by the symbol rate to be detected, and the bandwidths of the two sections of frequency spectrums are preset or determined according to the symbol rate to be detected;
s103, determining a correlation value between the two sections of frequency spectrums;
and S104, if the correlation value between the two sections of frequency spectrums is larger than a preset value, determining the frequency to be detected and the symbol rate to be detected as a group of candidate channel parameters.
10. The apparatus according to claim 9, wherein the demodulation module is further configured to perform fast fourier transform on the signal in the frequency band to be detected, and determine a frequency spectrum corresponding to the signal in the frequency band to be detected.
11. The apparatus of claim 9, wherein the demodulation module is further configured to perform the following steps S1051 to S1061:
s1051, adjusting the frequency to be measured, and re-executing the steps S102 to S104 until the adjusted frequency to be measured exceeds the frequency band to be measured;
and S1061, adjusting the symbol rate to be measured, resetting the frequency to be measured to the initial frequency, and re-executing the steps S102 to S1051 until the adjusted symbol rate to be measured exceeds a preset symbol rate range.
12. The apparatus of claim 9, wherein the demodulation module is further configured to perform the following steps S1052 to S1062:
s1052, adjusting the symbol rate to be measured, and re-executing the steps S102 to S104 until the adjusted symbol rate to be measured exceeds a preset symbol rate range;
s1062, adjusting the frequency to be measured, resetting the symbol rate to be measured to the initial symbol rate, and re-executing the steps S102 to S1052 until the adjusted frequency to be measured exceeds the frequency band to be measured.
13. The apparatus according to claim 11 or 12, wherein the demodulation module is further configured to increase the frequency to be measured by a first step size; or reducing the frequency to be measured by a first step length.
14. The apparatus of claim 11 or 12, wherein the demodulation module increases the symbol rate to be measured by a second step size; or, reducing the symbol rate to be measured by a second step size.
15. The apparatus of claim 9, wherein the demodulation module is further configured to obtain a channel according to a set of candidate channel parameters.
16. The apparatus according to claim 11 or 12, wherein the demodulation module is further configured to generate a ranking order of the multiple sets of candidate channel parameters according to a ranking of correlation values between two sections of frequency spectrums corresponding to the multiple sets of candidate channel parameters from large to small; and acquiring channels according to the sorting sequence and the multiple groups of candidate channel parameters one by one.
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| CN201810404537.2A CN110417493B (en) | 2018-04-28 | 2018-04-28 | Blind scanning method and device |
| PCT/CN2019/081963 WO2019205931A1 (en) | 2018-04-28 | 2019-04-09 | Blind scan method and device |
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| CN201810404537.2A CN110417493B (en) | 2018-04-28 | 2018-04-28 | Blind scanning method and device |
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| US7684467B2 (en) * | 2005-10-28 | 2010-03-23 | Silicon Laboratories Inc. | Performing blind scanning in a receiver |
| CN101778266B (en) * | 2010-01-22 | 2013-04-17 | 凌阳科技股份有限公司 | Blind scanning system and method for DVB-S system |
| TWI491256B (en) * | 2012-12-03 | 2015-07-01 | Mstar Semiconductor Inc | Channel scanning method for digital video broadcasting satellite signal |
| CN103873176B (en) * | 2012-12-11 | 2016-12-21 | 晨星软件研发(深圳)有限公司 | The channel scan method of satellite digital image broadcast singal |
| CN103945274A (en) * | 2013-04-19 | 2014-07-23 | 达腾科公司 | Method and equipment for providing interactive augmented reality information corresponding to television programs |
| GB201317461D0 (en) * | 2013-10-02 | 2013-11-13 | Imagination Tech Ltd | Satellite scanning |
| CN103945247A (en) * | 2014-05-05 | 2014-07-23 | 珠海迈科电子科技有限公司 | Method and device for positioning frequency point information by set-top box frequency spectrum |
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