CN115551116B - Method and system for establishing communication link based on dual-mode self-adaptive frequency band - Google Patents
Method and system for establishing communication link based on dual-mode self-adaptive frequency band Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/544—Setting up communications; Call and signalling arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/141—Setup of application sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a method and a system for establishing a communication link based on a dual-mode self-adaptive frequency band, wherein the method comprises the following steps: configuring the frequency range of a first digital filter of the HPLC to cover a preset communication frequency range; the method comprises the steps that signals are transmitted to a first receiver through a first digital filter of the HPLC, the received signals are processed through the first receiver, the frequency band where the signals are located is determined, and first parameters of the first digital filter of the HPLC are determined based on the frequency band; determining a wireless communication frequency band based on a frame protocol of HPLC; configuring the frequency band range of a second digital filter of the HRF to cover a preset frequency band range; transmitting the signal to a second receiver through a second digital filter of the HRF, processing the received signal through the second receiver, determining a frequency band in which the signal is located, determining a second parameter of the second digital filter of the HRF based on the frequency band; a dual-mode communication link is established based on the first parameters of the first digital filter, the communication band of the wireless, and the second parameters of the second digital filter.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and a system for establishing a communication link based on a dual-mode adaptive frequency band.
Background
The technical specification of dual-mode communication interconnection and intercommunication is a technical specification established for standardizing local communication of the electricity consumption information acquisition system by adopting a dual-mode communication mode, and two technical modes of high-speed power line carrier (HPLC) and wireless communication (HRF) are standardized in the existing specification.
HPLC is an interconnection and intercommunication power utilization information acquisition system of the current general high-speed power line carrier OFDM. Four frequency bands are needed and supported in its communication: band0, band1, band2, band3. The band0 frequency band ranges from 1.953MHz to 11.96MHz; considering the frequency use policy, three frequency bands of band1, band2 and band3 need to be supported.
The frequency Band range of HPLC Band1 is from 2.441MHz to 5.615MHz; the Band2 frequency range is from 0.781MHz to 2.930MHz; the Band3 frequency Band ranges from 1.758MHz to 2.930MHz; HRF is a dual-mode wireless communication system proposed by the national grid for co-existence with HPLC. The working frequency band is 470 MHz-510 MHz, and the total bandwidth is 40 MHz. The wireless system supports three communication modulations: option1, option2, option3. The modulation occupies a different bandwidth for different communications. Option1 each subchannel occupies 1M bandwidth; option2 each sub-channel occupies 500K bandwidth; option3 each subchannel occupies 200K of bandwidth.
Before the communication system is not networked, the HPLC cannot know under which band the system is operating. The HRF does not know the channel number and channel bandwidth the system is operating in the non-network-access mode and at the same time does not know in which mode the system is operating. In the power-on starting or power-down resetting process of the STA of the station, after the HPLC working BAND and HRF working channel numbers and the Option parameters of the CCO of the central coordinator are determined by scanning physical layer parameters, the normal communication between the STA and the CCO can be realized.
In the HPLC communication mode, the STA only needs to detect the CCO frequency band by a maximum 3 times of blind detection, and then realizes physical layer communication with the CCO. HPLC generally uses a scanning method to determine the operating band of CCO.
Part 4-2 of the specification for dual-mode communication interworking: the data link layer communication protocol, section 5.3.2.2, specifies that the CCO determines the number of the used wireless channel, and the corresponding Option, the STA scans the wireless channel in sequence, and tries to access the network on the channel if finding that the network exists on the channel.
In the prior art, the working frequency band of a dual-mode wireless communication system with HRF and HPLC existing simultaneously is 470 MHz-510 MHz, the bandwidth is 40MHz totally, and 200 channels are totally. The wireless system supports three communication modulations: option1, option2, option3. The modulation occupies a different bandwidth for different communications. Option1 each subchannel occupies 1M bandwidth; option2 each sub-channel occupies 500K bandwidth; option3 each subchannel occupies 200K of bandwidth. In the initial network access or module restart process, traversal scanning is required, and in the limit case, 200 × 3=600 blind detection probes and channel monitoring are required to determine the channel and the adopted bandwidth in the CCO wireless communication mode. Thus resulting in a longer time for a STA in dual mode communication to communicate with the CCO in wireless mode.
Therefore, a technique is needed to establish a communication link based on a dual mode adaptive frequency band.
Disclosure of Invention
The technical scheme of the invention provides a method and a system for establishing a dual-mode communication link based on a dual-mode adaptive frequency band, which are used for solving the problem of how to establish the dual-mode communication link based on the dual-mode adaptive frequency band.
In order to solve the above problem, the present invention provides a method for establishing a communication link based on a dual-mode adaptive frequency band, wherein the method comprises:
configuring the frequency range of a first digital filter of the HPLC to cover a preset communication frequency range;
the method comprises the steps that signals are transmitted to a first receiver through a first digital filter of the HPLC, the received signals are processed through the first receiver, the frequency band where the signals are located is determined, and first parameters of the first digital filter of the HPLC are determined based on the determined frequency band;
determining a wireless communication band based on a frame protocol of the HPLC;
configuring the frequency band range of a second digital filter of the HRF to cover a preset frequency band range;
transmitting the signal to a second receiver through a second digital filter of the HRF, processing the received signal through the second receiver, determining a frequency band in which the signal is located, and determining a second parameter of the second digital filter of the HRF based on the determined frequency band;
a dual-mode communication link is established based on the first parameter of the first digital filter, the wireless communication band, and the second parameter of the second digital filter.
Preferably, the preset communication frequency band is: 0.781MHz to 11.96MHz.
Preferably, the transmitting the signal to a first receiver through a first digital filter of the HPLC, processing the signal through the first receiver, determining a frequency band in which the signal is located, and determining a first parameter of the first digital filter of the HPLC based on the determined frequency band includes:
performing time domain correlation processing on the received signal through the first receiver, and outputting a time domain cross correlation value;
when the time domain cross-correlation value of a detection point in the signal is greater than a time domain cross-correlation threshold, determining a frame corresponding to the detection point as a target frame;
performing FFT processing on the data synchronized with the target frame to acquire frequency domain data of the target frame;
performing energy normalization cross-correlation model operation on the frequency domain data and a communication frequency band preset by HPLC (high performance liquid chromatography), and acquiring a preset frequency domain cross-correlation value of each communication frequency band;
selecting a communication frequency band corresponding to the maximum frequency domain cross-correlation value as a frequency band of the signal;
a first parameter of a first digital filter of the HPLC is determined according to the frequency band of the signal.
Preferably, the performing, by the first receiver, time-domain correlation processing on the received signal to output a time-domain cross-correlation value includes:
wherein c (d) is the time domain cross correlation value of d points, r (N + d) is the N + d number of the received signals, x (N) is the value of the N point of a locally stored sequence with the length of N, and N is the data length of the cross correlation.
Preferably, when the time-domain cross-correlation value of the detection point in the signal is greater than the time-domain cross-correlation threshold, determining that the frame corresponding to the detection point is the target frame includes:
wherein the content of the first and second substances,
is d 0 Point corresponding frame, T is a time domain mutual closing threshold value, and>
is d 0 The time-domain cross-correlation value of the points.
Preferably, the performing FFT processing on the data synchronized with the target frame to obtain frequency domain data of the target frame includes:
wherein, the first and the second end of the pipe are connected with each other,
is->
Based on the frequency domain sequence of->
Is given by d 0 As the time domain data of the start point,kis a frequency domain variable.
Preferably, the performing energy normalization cross-correlation modeling operation on the frequency domain data and a communication frequency band preset by HPLC to obtain a preset frequency domain cross-correlation value of each communication frequency band includes:
wherein the content of the first and second substances,
is a frequency-domain cross-correlation value of the nth frequency band>
Frequency domain data of the k-th sub-carrier of the nth band.
Preferably, the preset frequency band range is: 500KHz to 1MHz.
Preferably, the transmitting the signal to the second receiver through the second digital filter of the HRF, processing the received signal through the second receiver, determining a frequency band in which the signal is located, and determining the second parameter of the second digital filter of the HRF based on the determined frequency band includes:
performing delayed autocorrelation processing on the received signal through the second receiver, and outputting a time domain cross-correlation value;
when the time domain cross-correlation value of the detection point in the signal is larger than a time domain mutual closing threshold value, determining a frame corresponding to the detection point as a target frame;
performing FFT processing on the data synchronized with the target frame to acquire frequency domain data of the target frame;
performing energy normalization cross-correlation modeling operation on the frequency domain data and the communication modulation Optiono data of the HRF to obtain a frequency domain cross-correlation value of each communication modulation Optiono data;
selecting a communication modulation Option corresponding to the maximum frequency domain cross-correlation value as a frequency band of the signal;
a second parameter of a second digital filter of the HRF is determined according to the frequency band of the signal.
According to another aspect of the present invention, a computer-readable storage medium is provided, where the computer-readable storage medium stores a computer program for executing a method for establishing a communication link based on a dual-mode adaptive frequency band.
Based on still another aspect of the present invention, the present invention provides an electronic device, comprising: a processor and a memory; wherein the content of the first and second substances,
the memory to store the processor-executable instructions;
the processor is configured to read the executable instructions from the memory and execute the instructions to implement a method for establishing a communication link based on a dual-mode adaptive frequency band.
Based on another aspect of the present invention, the present invention provides a system for establishing a communication link based on a dual-mode adaptive frequency band, the system comprising:
the first configuration unit is used for configuring the frequency band range of a first digital filter of the HPLC to cover a preset communication frequency band;
the first determining unit is used for transmitting the signal to a first receiver through a first digital filter of the HPLC, processing the received signal through the first receiver, determining a frequency band where the signal is located, and determining a first parameter of the first digital filter of the HPLC based on the determined frequency band;
a second determination unit for determining a wireless communication band based on a frame protocol of the HPLC;
a second configuration unit, configured to configure a frequency band range of a second digital filter of the HRF to cover a preset frequency band range;
a third determining unit, configured to transmit the signal to a second receiver through a second digital filter of the HRF, process the received signal through the second receiver, determine a frequency band in which the signal is located, and determine a second parameter of the second digital filter of the HRF based on the determined frequency band;
and the establishing unit is used for establishing the dual-mode communication link based on the first parameter of the first digital filter, the wireless communication frequency band and the second parameter of the second digital filter.
The technical scheme of the invention provides a method and a system for establishing a communication link based on a dual-mode self-adaptive frequency band, wherein the method comprises the following steps: configuring the frequency range of a first digital filter of the HPLC to cover a preset communication frequency range; the method comprises the steps that signals are transmitted to a first receiver through a first digital filter of the HPLC, the received signals are processed through the first receiver, the frequency band where the signals are located is determined, and first parameters of the first digital filter of the HPLC are determined based on the determined frequency band; determining a wireless communication frequency band based on a frame protocol of HPLC; configuring the frequency band range of a second digital filter of the HRF to cover a preset frequency band range; transmitting the signal to a second receiver through a second digital filter of the HRF, processing the received signal through the second receiver, determining a frequency band in which the signal is located, and determining a second parameter of the second digital filter of the HRF based on the determined frequency band; a dual-mode communication link is established based on the first parameter of the first digital filter, the communication band of the wireless, and the second parameter of the second digital filter. The technical scheme of the invention solves the problem of low networking speed of the electricity consumption information acquisition system under local dual-mode communication, and the station STA can quickly and reliably determine the basic parameter configuration of HPLC and HRF adopted by the CCO of the central coordinator, and realizes dual-mode communication with the CCO of the central coordinator within a second-level time range.
Drawings
Exemplary embodiments of the invention may be more completely understood in consideration of the following drawings:
fig. 1 is a flowchart of a method for establishing a communication link based on a dual-mode adaptive frequency band according to a preferred embodiment of the present invention;
FIG. 2 is a flow chart of the basic processing of a receiver in accordance with the preferred embodiment of the present invention;
FIG. 3 is a flow chart of dual-mode network access frequency band according to the preferred embodiment of the present invention;
FIG. 4 is a flow chart of HPLC frame synchronization and band search according to the preferred embodiment of the present invention;
FIG. 5 is a flow chart of HRF frame synchronization and band search according to the preferred embodiment of the present invention; and
fig. 6 is a system structure diagram for establishing a communication link based on a dual-mode adaptive frequency band according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a method for establishing a communication link based on a dual-mode adaptive frequency band according to a preferred embodiment of the present invention. The invention provides a method for a HPLC (high performance liquid chromatography) and HRF (high resolution factor) dual-mode self-adaptive frequency band. The invention provides a method capable of realizing fast self-frequency band adaptation of HPLC + HRF, aiming at the problem that the network frequency band and bandwidth are required to be confirmed by frequency sweeping before network access of the HPLC + HRF.
The total number of HPLC (high performance liquid chromatography) is four bands, the total bandwidth covers 0.781MHz to 11.96MHz, and as the lead code of the frame synchronization generated by the system is generated in the same way, only different sub-bands are shielded for the sub-bands outside the useful frequency band, if the digital filter of the system is designed according to the narrower sub-bands, the real frequency band of the system cannot be distinguished at all.
Before an HPLC system is not connected to a network, a digital filter is designed according to the maximum bandwidth range, namely 0.781MHz to 11.96MHz. The present invention performs frame synchronization and band acknowledgement according to the steps shown in fig. 2.
As shown in fig. 1, the present invention provides a method for establishing a communication link based on a dual-mode adaptive frequency band, the method comprising:
step 101: configuring the frequency range of a first digital filter of the HPLC to cover a preset communication frequency range;
step 102: the method comprises the steps that signals are transmitted to a first receiver through a first digital filter of the HPLC, the received signals are processed through the first receiver, the frequency band where the signals are located is determined, and first parameters of the first digital filter of the HPLC are determined based on the determined frequency band;
preferably, the preset communication frequency band is: 0.781MHz to 11.96MHz.
Preferably, the signal is transmitted to a first receiver through a first digital filter of the HPLC, the signal is processed by the first receiver, a frequency band in which the signal is located is determined, and a first parameter of the first digital filter of the HPLC is determined based on the determined frequency band, including:
performing time domain correlation processing on the received signal through a first receiver, and outputting a time domain cross-correlation value;
when the time domain cross-correlation value of the detection point in the signal is larger than a time domain mutual closing threshold value, determining a frame corresponding to the detection point as a target frame;
performing FFT processing on the data synchronized with the target frame to acquire frequency domain data of the target frame;
performing energy normalization cross-correlation model operation on the frequency domain data and a communication frequency band preset by HPLC (high performance liquid chromatography), and acquiring a preset frequency domain cross-correlation value of each communication frequency band;
selecting a communication frequency band corresponding to the maximum frequency domain cross-correlation value as a frequency band of the signal;
a first parameter of a first digital filter of the HPLC is determined according to the frequency band of the signal.
Preferably, the time-domain correlation processing is performed on the received signal by the first receiver, and the outputting the time-domain cross-correlation value includes:
wherein c (d) is the time domain cross correlation value of d points, r (N + d) is the N + d number of the received signals, x (N) is the value of the N point of a locally stored sequence with the length of N, and N is the data length of the cross correlation.
Preferably, when the time-domain cross-correlation value of the detection point in the signal is greater than the time-domain cross-correlation threshold, determining that the frame corresponding to the detection point is the target frame includes:
wherein the content of the first and second substances,
is d 0 Absolute value d of point time domain cross correlation value 0 Point corresponding frame, T is a time domain mutual closing threshold value, and>
is d 0 The time domain cross correlation value of the point.
Preferably, the FFT processing of the data synchronized with the target frame to obtain the frequency domain data of the target frame includes:
wherein, the first and the second end of the pipe are connected with each other,
is->
Based on the frequency domain sequence of->
Is represented by d 0 As time domain data of the starting point,kis a frequency domain variable. The above formula is a formula of DFT, a formula of converting from a time domain sequence to a frequency domain sequence.
Preferably, the energy normalization cross-correlation modeling operation is performed on the frequency domain data and the communication frequency band preset by HPLC, and the obtaining of the preset frequency domain cross-correlation value of each communication frequency band includes:
wherein, the first and the second end of the pipe are connected with each other,
for a frequency-domain cross-correlation value in the nth frequency band>
The frequency domain data for the kth subcarrier of the nth band is generated according to the HPLC physical layer standard.
Fig. 2 is a schematic diagram of an overall flow diagram for an adaptive receive band, and detailed flow diagrams are shown in fig. 4 and 5, which respectively introduce detailed block diagrams for HPLC HRFs. For example, HPLC configures the frequency band of the digital filter to include the filtering parameters of all communication frequency bands (including band 0-band 3), so that the signals of the 4 frequencies can reach the receiver. After the receiver processes data, the frequency range of the signal is used to determine the frequency band of the received signal, and then the digital filter is adjusted to be the digital filter parameter corresponding to the frequency band according to the determined frequency band.
The invention confirms that the HPLC frequency bands comprise:
step 1: the digital filter is configured such that the parameters of the digital filter configuration are capable of supporting all communication frequencies. And for bands 0-band 3, configuring the band-pass filtering frequency band of the filter to support parameters of 0.78M-12M.
And2, performing time domain cross-correlation processing, namely processing according to the following formula, wherein r (N-d) is the number N + d of the received signals, and x (N) is the value of the nth point of a locally stored sequence with the length of N. N is the length of the cross-correlation data, 1024 in HPLC. c (d) is the output of the time-domain cross-correlation.
Step 3, when a certain value (e.g. d) exists 0 ) So that the modulus of the correlation value is larger than the correlation threshold T, which is selected in relation to the signal-to-noise ratio and the false alarm rate, for example, 0.2, the frame is considered to be found.
Step 4, the system processes the frame synchronization data by FFT (fast algorithm of DFT)
Due to d 0 Is the detected point of the frame, so N points are continuously taken from the current point to the historical point for FFT calculation.
And 5, performing energy normalization cross correlation modeling operation on the frequency domain data and the local 4 band data.
The following formula is an energy normalized cross-correlation formula, F (k) is derived from step 4,
the definition of X (n, k) is as follows, explained after step 7
If:
for>
In both cases, communication system of HPLC>
。
Step 6: and 5, obtaining 4 frequency domain cross correlation values, and taking the input corresponding to the maximum value, namely the frequency band corresponding to the received signal.
The present invention assumes
If the band corresponding to the received signal is n 1
And 7: and adjusting the frequency band of the digital filter to be the filter coefficient of the n1 frequency band.
Local sequence of frame synchronization in the invention:
wherein:
step 103: determining a wireless communication frequency band based on a frame protocol of HPLC;
since the HPLC is already on the network at this time, the invention can add wireless frequency band information in the HPLC frame protocol. The data link layer protocol in the HPLC protocol contains many reserved bits (e.g., reserved field 9bits of the variable part of the beacon frame), and notifies the wireless channel number used by the CCO to other non-network-entry nodes STA in a broadcast manner, so that the STA omits a channel traversal process and directly adjusts the receiver to a channel frequency point where the CCO operates.
Step 104: configuring the frequency band range of a second digital filter of the HRF to cover a preset frequency band range;
step 105: transmitting the signal to a second receiver through a second digital filter of the HRF, processing the received signal through the second receiver, determining a frequency band in which the signal is located, and determining a second parameter of the second digital filter of the HRF based on the determined frequency band;
step 106: a dual-mode communication link is established based on the first parameter of the first digital filter, the communication band of the wireless, and the second parameter of the second digital filter.
Preferably, the preset frequency band ranges are: 500KHz to 1MHz.
Preferably, the transmitting the signal to the second receiver through the second digital filter of the HRF, the processing the received signal by the second receiver, determining a frequency band in which the signal is located, and determining the second parameter of the second digital filter of the HRF based on the determined frequency band, includes:
performing delay autocorrelation processing on the received signal through a second receiver, and outputting a time domain cross-correlation value;
when the time domain cross-correlation value of the detection point in the signal is larger than a time domain mutual closing threshold value, determining a frame corresponding to the detection point as a target frame;
performing FFT processing on the data synchronized with the target frame to acquire frequency domain data of the target frame;
performing energy normalization cross-correlation modeling operation on the frequency domain data and the communication modulation Optiono data of the HRF to obtain a frequency domain cross-correlation value of each communication modulation Optiono data;
selecting the communication modulation Option corresponding to the maximum frequency domain cross-correlation value as the frequency band of the signal;
a second parameter of a second digital filter of the HRF is determined according to the frequency band of the signal.
In the wireless modulation mode confirmation, the whole process is similar to HPLC (high performance liquid chromatography), the whole process is as shown in figure 5, the process is similar to HPLC, the channel number and the channel Option parameters of the HRF can be determined only by performing channel Option trial reception for 3 times, and the STA can quickly realize dual-mode communication with the CCO.
Step 1: the digital filter range is configured to include all modes of the HRF, including Option1, option2, option3. The low-pass filter is configured with a filtering bandwidth of 500KHz, and the highest sampling rate of the system with a baseband sampling rate of Option is 1MHz.
Step 2: the received signal is processed by delayed autocorrelation (frame detection is usually performed by cross-correlation and delayed autocorrelation, the radio part is more suitable for delayed autocorrelation)
Where r (N) is the received sequence, nd is the delay length of the delayed autocorrelation, r x (N) is the conjugate taken for the nth point received, and N is the length of the delayed autocorrelation.
And3, step 3: when the modulus of the related value is larger than or equal to a certain threshold, the frame detection is considered to be successful
When a certain value (e.g. d) is present 0 ) So that the modulus of the correlation value is larger than the correlation threshold T, which is selected in dependence on the signal-to-noise ratio, false alarm rate, e.g. 0.2
Step 4, the system processes the frame synchronization data by FFT (fast algorithm of DFT)
Due to d 0 Is the point detected by the frame, so N points are continuously taken from the current point to the historical point for FFT calculation, and for HRF, N =128
Step 5, performing energy normalization cross-correlation module operation on the frequency domain data and the local three Option data, wherein X (n, k) is the value of the k-th subcarrier of the n-th Option of the local frequency domain sequence, and for the k-th subcarrier of the n-th Option of the local frequency domain sequence
And 6: 3 frequency domain cross-correlation values are obtained, and the input corresponding to the maximum value is taken, namely the frequency band corresponding to the received signal.
Suppose that
If so, the Option corresponding to the HRF received signal is n1.
And 7: and modifying the filter parameters into the filter parameters of the corresponding Option, and modifying the baseband sampling rate into the sampling rate corresponding to the Option.
The invention can finish band type judgment of HPLC and Option type judgment of HRF only by once detection, thereby omitting the process of frequency band trial judgment and reducing the network access time of the dual-mode STA. Because the STA is associated with the same and unique CCO through the HPLC or the HRF, the scheme utilizes the characteristic of fast network access time of the HPLC under the condition of not increasing any hardware cost and circuit overhead, the STA fast acquires the HRF channel number through the HPLC, the channel traversing probing process is omitted, the time for establishing or recovering the wireless communication link between the CCO and the STA is greatly improved, and the average wireless communication link establishment time is shortened to 1/50 of the traversing mode.
The invention adopts time domain cross-correlation to carry out symbol synchronization detection, and utilizes frequency domain correlation coefficient to judge the BAND/Option type.
The invention utilizes the beacon frame information of HPLC to assist the HRF to directly determine the channel number, thereby avoiding the traversing scanning process of the HRF channel and reducing the network access time of the HRF.
The present invention provides a computer-readable storage medium having stored thereon a computer program for executing a method for establishing a communication link based on a dual-mode adaptive frequency band.
The present invention provides an electronic device, including: a processor and a memory; wherein, the first and the second end of the pipe are connected with each other,
a memory for storing processor-executable instructions;
and the processor is used for reading the executable instruction from the memory and executing the instruction to realize a method for establishing a communication link based on the dual-mode adaptive frequency band.
Fig. 6 is a system structure diagram for establishing a communication link based on a dual-mode adaptive frequency band according to a preferred embodiment of the present invention. As shown in fig. 6, the present invention provides a system for establishing a communication link based on a dual-mode adaptive frequency band, which comprises:
a first configuration unit 601, configured to configure a frequency band range of a first digital filter of the HPLC to cover a preset communication frequency band;
a first determining unit 602, configured to transmit a signal to a first receiver through a first digital filter of the HPLC, process the received signal through the first receiver, determine a frequency band in which the signal is located, and determine a first parameter of the first digital filter of the HPLC based on the determined frequency band;
preferably, the preset communication frequency band is: 0.781MHz to 11.96MHz.
Preferably, the signal is transmitted to a first receiver through a first digital filter of the HPLC, the signal is processed by the first receiver, a frequency band in which the signal is located is determined, and a first parameter of the first digital filter of the HPLC is determined based on the determined frequency band, including:
performing time domain correlation processing on the received signal through a first receiver, and outputting a time domain cross-correlation value;
when the time domain cross-correlation value of the detection point in the signal is larger than a time domain mutual closing threshold value, determining a frame corresponding to the detection point as a target frame;
performing FFT processing on the data synchronized with the target frame to acquire frequency domain data of the target frame;
performing energy normalization cross-correlation model operation on the frequency domain data and a communication frequency band preset by HPLC (high performance liquid chromatography), and acquiring a preset frequency domain cross-correlation value of each communication frequency band;
selecting a communication frequency band corresponding to the maximum frequency domain cross-correlation value as a frequency band of the signal;
a first parameter of a first digital filter of the HPLC is determined according to the frequency band of the signal.
Preferably, the time-domain correlation processing is performed on the received signal by the first receiver, and the outputting the time-domain cross-correlation value includes:
wherein c (d) is the time domain cross correlation value of d points, r (N + d) is the N + d number of the received signals, x (N) is the value of the N point of a locally stored sequence with the length of N, and N is the data length of the cross correlation.
Preferably, when the time-domain cross-correlation value of the detection point in the signal is greater than the time-domain cross-correlation threshold, determining that the frame corresponding to the detection point is the target frame includes:
wherein, the first and the second end of the pipe are connected with each other,
is d 0 Point corresponding frame, T is a time domain mutual closing threshold value, and>
is d 0 The time domain cross correlation value of the point.
Preferably, the FFT processing of the data synchronized with the target frame to obtain the frequency domain data of the target frame includes:
wherein the content of the first and second substances,
is->
Based on the frequency domain sequence of->
Is given by d 0 As time domain data of the starting point,kis a frequency domain variation. The above formula is a formula of DFT, a formula of converting from a time domain sequence to a frequency domain sequence.
Preferably, the energy normalization cross-correlation modeling operation is performed on the frequency domain data and the communication frequency band preset by HPLC, and the obtaining of the preset frequency domain cross-correlation value of each communication frequency band includes:
wherein the content of the first and second substances,
is a frequency-domain cross-correlation value of the nth frequency band>
And generating frequency domain data of the k sub-carrier of the nth band according to an HPLC physical layer standard.
A second determining unit 603 configured to determine a wireless communication band based on a frame protocol of HPLC;
a second configuring unit 604, configured to configure a frequency band range of a second digital filter of the HRF to cover a preset frequency band range;
a third determining unit 605, configured to transmit the signal to the second receiver through the second digital filter of the HRF, process the received signal through the second receiver, determine a frequency band in which the signal is located, and determine a second parameter of the second digital filter of the HRF based on the determined frequency band;
preferably, the preset frequency band ranges are: 500KHz to 1MHz.
Preferably, the transmitting the signal to the second receiver through the second digital filter of the HRF, the processing the received signal through the second receiver, determining the frequency band in which the signal is located, and determining the second parameter of the second digital filter of the HRF based on the determined frequency band, includes:
performing delayed autocorrelation processing on the received signal through a second receiver, and outputting a time domain cross-correlation value;
when the time domain cross-correlation value of the detection point in the signal is larger than a time domain mutual closing threshold value, determining a frame corresponding to the detection point as a target frame;
performing FFT processing on the data synchronized with the target frame to acquire frequency domain data of the target frame;
performing energy normalization cross-correlation modeling operation on the frequency domain data and the communication modulation Optiono data of the HRF to obtain a frequency domain cross-correlation value of each communication modulation Optiono data;
selecting a communication modulation Option corresponding to the maximum frequency domain cross-correlation value as a frequency band of the signal;
a second parameter of a second digital filter of the HRF is determined according to the frequency band of the signal.
A establishing unit 606 for establishing the dual-mode communication link based on the first parameter of the first digital filter, the communication band of the radio and the second parameter of the second digital filter.
The system for establishing a communication link based on a dual-mode adaptive frequency band provided by the embodiment of the present invention corresponds to the method for establishing a communication link based on a dual-mode adaptive frequency band provided by the embodiment of the present invention, and details are not repeated herein.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a// the [ device, component, etc ]" are to be interpreted openly as at least one instance of a device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (10)
1. A method for establishing a communication link based on a dual-mode adaptive frequency band, the method comprising:
configuring the frequency range of a first digital filter of the HPLC to cover a preset communication frequency range;
the method comprises the steps that signals are transmitted to a first receiver through a first digital filter of the HPLC, the received signals are processed through the first receiver, the frequency band where the signals are located is determined, and first parameters of the first digital filter of the HPLC are determined based on the determined frequency band;
determining a wireless communication frequency band based on a frame protocol of HPLC;
configuring the frequency band range of a second digital filter of the HRF to cover a preset frequency band range;
transmitting the signal to a second receiver through a second digital filter of the HRF, processing the received signal through the second receiver, determining a frequency band in which the signal is located, and determining a second parameter of the second digital filter of the HRF based on the determined frequency band;
establishing a dual-mode communication link based on first parameters of the first digital filter, a wireless communication band, and second parameters of a second digital filter;
the method comprises the steps of conveying a signal to a first receiver through a first digital filter of the HPLC, processing the signal through the first receiver, determining a frequency band where the signal is located, and determining a first parameter of the first digital filter of the HPLC based on the determined frequency band, wherein the method comprises the following steps:
performing time domain correlation processing on the received signal through the first receiver, and outputting a time domain cross correlation value;
when the time domain cross-correlation value of the detection point in the signal is larger than a time domain mutual closing threshold value, determining a frame corresponding to the detection point as a target frame;
performing FFT processing on the data synchronized with the target frame to acquire frequency domain data of the target frame;
performing energy normalization cross-correlation model operation on the frequency domain data and a communication frequency band preset by HPLC (high performance liquid chromatography), and acquiring a preset frequency domain cross-correlation value of each communication frequency band;
selecting a communication frequency band corresponding to the maximum frequency domain cross-correlation value as a frequency band of the signal;
determining a first parameter of a first digital filter of the HPLC according to the frequency band of the signal;
wherein the transmitting of the signal to the second receiver by the second digital filter of the HRF, the processing of the received signal by the second receiver, the determining of the frequency band in which the signal is located, the determining of the second parameter of the second digital filter of the HRF on the basis of the determined frequency band, comprises:
performing delayed autocorrelation processing on the received signal through the second receiver, and outputting a time domain cross-correlation value;
when the time domain cross-correlation value of the detection point in the signal is larger than a time domain mutual closing threshold value, determining a frame corresponding to the detection point as a target frame;
performing FFT processing on the data synchronized with the target frame to acquire frequency domain data of the target frame;
performing energy normalization cross-correlation modeling operation on the frequency domain data and the communication modulation Optiono data of the HRF to obtain a frequency domain cross-correlation value of each communication modulation Optiono data;
selecting a communication modulation Option corresponding to the maximum frequency domain cross-correlation value as a frequency band of the signal;
a second parameter of a second digital filter of the HRF is determined according to the frequency band of the signal.
2. The method of claim 1, wherein the predetermined communication frequency band is: 0.781MHz to 11.96MHz.
3. The method of claim 1, performing time-domain correlation processing on the received signal by the first receiver to output a time-domain cross-correlation value, comprising:
wherein c (d) is the time domain cross correlation value of d points, r (N + d) is the N + d number of the received signals, x (N) is the value of the N point of a locally stored sequence with the length of N, and N is the data length of the cross correlation.
4. The method of claim 3, when the time-domain cross-correlation value of the detection points existing in the signal is greater than the time-domain cross-correlation threshold, determining the frame corresponding to the detection point as the target frame, comprising:
wherein the content of the first and second substances,
is d 0 Point corresponding frame, T is a time domain mutual closing threshold value, and>
is d 0 The time-domain cross-correlation value of the points.
5. The method of claim 4, wherein performing FFT processing on the data synchronized with the target frame to obtain frequency domain data of the target frame comprises:
wherein the content of the first and second substances,
is->
In the frequency domain sequence of (a), in>
Is given by d 0 As the time domain data of the start point,kis a frequency domain variation.
6. The method of claim 5, wherein performing an energy normalization cross-correlation modeling operation on the frequency domain data and a communication frequency band preset by HPLC to obtain a preset frequency domain cross-correlation value of each communication frequency band comprises:
wherein the content of the first and second substances,
is a frequency-domain cross-correlation value of the nth frequency band>
Frequency domain data of a k-th subcarrier of an nth band.
7. The method of claim 1, wherein the preset frequency band range is: 500KHz to 1MHz.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for performing the method of any of claims 1-7.
9. An electronic device, characterized in that the electronic device comprises: a processor and a memory; wherein the content of the first and second substances,
the memory to store the processor-executable instructions;
the processor to read the executable instructions from the memory and execute the instructions to implement the method of any of claims 1-7.
10. A system for establishing a communication link based on a dual mode adaptive frequency band, the system comprising:
the first configuration unit is used for configuring the frequency band range of a first digital filter of the HPLC to cover a preset communication frequency band;
the first determining unit is used for transmitting the signal to a first receiver through a first digital filter of the HPLC, processing the received signal through the first receiver, determining a frequency band where the signal is located, and determining a first parameter of the first digital filter of the HPLC based on the determined frequency band;
a second determination unit for determining a wireless communication band based on a frame protocol of the HPLC;
a second configuration unit, configured to configure a frequency band range of a second digital filter of the HRF to cover a preset frequency band range;
a third determining unit, configured to transmit the signal to a second receiver through a second digital filter of the HRF, process the received signal through the second receiver, determine a frequency band in which the signal is located, and determine a second parameter of the second digital filter of the HRF based on the determined frequency band;
an establishing unit, configured to establish a dual-mode communication link based on a first parameter of the first digital filter, a wireless communication band, and a second parameter of a second digital filter;
the method includes the steps of transmitting a signal to a first receiver through a first digital filter of the HPLC, processing the signal through the first receiver, determining a frequency band where the signal is located, and determining a first parameter of the first digital filter of the HPLC based on the determined frequency band, wherein the steps include:
performing time domain correlation processing on the received signal through a first receiver, and outputting a time domain cross-correlation value;
when the time domain cross-correlation value of the detection point in the signal is larger than a time domain mutual closing threshold value, determining a frame corresponding to the detection point as a target frame;
performing FFT processing on the data synchronized with the target frame to acquire frequency domain data of the target frame;
performing energy normalization cross-correlation model operation on the frequency domain data and a communication frequency band preset by HPLC (high performance liquid chromatography), and acquiring a preset frequency domain cross-correlation value of each communication frequency band;
selecting a communication frequency band corresponding to the maximum frequency domain cross-correlation value as a frequency band of the signal;
determining a first parameter of a first digital filter of the HPLC according to the frequency band of the signal;
wherein the transmitting the signal to the second receiver through the second digital filter of the HRF, the processing the received signal through the second receiver, determining a frequency band in which the signal is located, and determining second parameters of the second digital filter of the HRF based on the determined frequency band comprises:
performing delay autocorrelation processing on the received signal through a second receiver, and outputting a time domain cross-correlation value;
when the time domain cross-correlation value of the detection point in the signal is larger than a time domain mutual closing threshold value, determining a frame corresponding to the detection point as a target frame;
performing FFT processing on the data synchronized with the target frame to acquire frequency domain data of the target frame;
performing energy normalization cross-correlation modeling operation on the frequency domain data and the communication modulation Optiono data of the HRF to obtain a frequency domain cross-correlation value of each communication modulation Optiono data;
selecting a communication modulation Option corresponding to the maximum frequency domain cross-correlation value as a frequency band of the signal;
a second parameter of a second digital filter of the HRF is determined according to the frequency band of the signal.
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| CN113595594A (en) * | 2021-07-22 | 2021-11-02 | 北京中宸微电子有限公司 | Frame timing synchronization method and device for power line carrier |
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