CN108270714A - A kind of generation method and equipment of frame preamble signal - Google Patents
A kind of generation method and equipment of frame preamble signal Download PDFInfo
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- CN108270714A CN108270714A CN201810105597.4A CN201810105597A CN108270714A CN 108270714 A CN108270714 A CN 108270714A CN 201810105597 A CN201810105597 A CN 201810105597A CN 108270714 A CN108270714 A CN 108270714A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
- H04L27/2663—Coarse synchronisation, e.g. by correlation
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
- H04L27/2665—Fine synchronisation, e.g. by positioning the FFT window
Abstract
A kind of generation method and equipment of frame preamble signal, to realize the communication in PLC system between each equipment.Method includes：Before the first equipment sends physical frame to the second equipment, the first equipment generates orthogonal frequency division multiplex OFDM symbol according to predetermined sequence；First equipment repeats OFDM symbol and obtains the first frame head；First equipment obtains the second frame head using synchronizing sequence modulation OFDM symbol；First frame head and the second frame head are sent to the second equipment by the first equipment successively as the frame preamble signal of physical frame, and frame preamble signal is used to indicate the initial time of physical frame.
Description
Technical field
The present invention relates to the communications field more particularly to a kind of generation methods and equipment of frame preamble signal.
Background technology
Power line carrier, PLC (Power Line Communication, PLC) technology is to be passed using power line into row information
A kind of defeated communication technology, due to without set up new communication network again, PLC technology has that communications cost is low, broad covered area
Etc. advantages.But power line network is laid with to transmit power frequency electric energy, therefore is mounted in power line network largely not
Same type equipment, the cut-offfing of these equipment, the winding between frequency conversion and power line and bends, and can cause noise in PLC system
Greatly, interference is strong, load impedance variation acutely and frequency selective fading is serious, so as to cause PLC system adaptability and can
It is poor by property.
In order to improve the above problem, the existing PLC system generally use bandwidth carrier communication technology.Existing bandwidth carrier
For the communication technology usually using the frequency range in the range of 2MHz~12MHz, traffic rate is high, is answered what is be transmitted with overhead power transmission line
It is fine with realization effect in scene.But in other application scene, for example, the application scenarios being transmitted with buried power line, base
In the PLC system of the existing bandwidth carrier communication technology, there are still problems with：(1) communication performance of PLC system it is limited (such as
White Gaussian noise background lower critical signal-to-noise ratio about -5dB)；(2) communication performance of PLC system is limited to, transmitting terminal is needed with higher
Transmission power (working frequency range in up to -45dBm/Hz) carry out signal transmission, the radiation that transmission process generates is to short wave communication
Severe jamming can be caused with shortwave monitor；(3) in PLC system, continuous transmission beacon frame realizes that clock is inclined between communication equipment
Difference estimation, causes the waste of the communication resource；(4) communication distance is short, can not meet practical application request, such as can not realize carry
The communication between each equipment in buried power line network.
To sum up, the existing bandwidth carrier communication technology still cannot preferably realize the communication of applicable broadband carrier communication
Communication in system between each equipment.
Invention content
The embodiment of the present application provides a kind of generation method and equipment of frame preamble signal, to solve using existing broadband
The radiation that system communication performance present in the communication system of carrier communication is limited, transmitting terminal transmission process generates is to shortwave
Serious interference, the waste of the communication resource caused by communication and shortwave monitor and the technical problems such as communication distance is short, so as to preferably
Communication in the communication system of ground realization applicable broadband carrier communication between each equipment.
In a first aspect, the embodiment of the present application provides a kind of generation method of frame preamble signal, including：
Before the first equipment sends physical frame to the second equipment, the first equipment generates orthogonal frequency division multiplexing according to predetermined sequence
With OFDM symbol, repeat OFDM symbol and obtain the first frame head, and the second frame head is obtained using synchronizing sequence modulation OFDM symbol, from
And the first equipment can be sent to the second equipment successively using the first frame head and the second frame head as the frame preamble signal of physical frame, it should
Frame preamble signal is used to indicate the initial time of physical frame.
Wherein, the first frame head includes detection frame head and/or coarse synchronization frame head, and detection frame head identifies object for the second equipment
Frame is managed, coarse synchronization frame head is used for the initial time of the second equipment rough estimate physical frame；Second frame head includes fine synchronization frame
Head, fine synchronization frame head accurately estimate the initial time of physical frame for the second equipment.
In a kind of possible design, predetermined sequence includes the sequence that length is the first length, and OFDM symbol includes length
OFDM symbol for the first length.
Correspondingly, the first equipment generates OFDM symbol according to predetermined sequence, including：First equipment is the first length to length
Sequence carry out fast fourier inverse transformation, obtain length be the first length OFDM symbol.
In a kind of possible design, the first equipment repeats OFDM symbol and obtains the first frame head, including：First equipment will be long
It spends to be repeated as many times for the OFDM symbol of the first length and obtains detection frame head.
In a kind of possible design, the first equipment obtains the second frame head using synchronizing sequence modulation OFDM symbol, including：
First equipment uses synchronizing sequence modulation length to obtain fine synchronization frame head for the OFDM symbol of the first length.
In a kind of possible design, predetermined sequence further includes the sequence that length is the second length, and OFDM symbol further includes
Length is the OFDM symbol of the second length, and the first length is less than the second length.
Correspondingly, the first equipment generates OFDM symbol according to predetermined sequence, including：First equipment is the second length to length
Sequence carry out fast fourier inverse transformation, obtain length be the second length OFDM symbol.
Correspondingly, the first equipment, which repeats OFDM symbol, obtains the first frame head, including：Length is the second length by the first equipment
OFDM symbol be repeated as many times obtain coarse synchronization frame head.
In a kind of possible design, length is that sub-carrier frequencies are used in the OFDM symbol of the second length with length
Sub-carrier frequencies used in the OFDM symbol of first length are orthogonal.
In a kind of possible design, the first equipment is using the first frame head and the second frame head as the frame preamble signal of physical frame
It is sent to before the second equipment, further includes successively：Length for the OFDM symbol of the first length is repeated as many times and obtains by the first equipment
Coarse synchronization buffers frame head, and coarse synchronization buffering frame head is used to fill up the time between coarse synchronization frame head and fine synchronization frame head
Section.
In a kind of possible design, the transmission sequence of the frame preamble signal of physical frame is after from elder generation：Detect frame head, thick
Slightly synchronizing frame head, coarse synchronization buffering frame head, fine synchronization frame head；Or detection frame head, coarse synchronization frame head, fine synchronization frame
Head.
In a kind of possible design, synchronizing sequence be the sequence with strong autocorrelation, the sequence of the strong autocorrelation
It is to be more than first threshold with itself matching value, and the matching value with itself being delayed is less than the sequence of second threshold.
Second aspect, the embodiment of the present application provide a kind of equipment, including：
Processing unit, for before physical frame is sent to receiving device, orthogonal frequency division multiplexing to be generated according to predetermined sequence
It with OFDM symbol, repeats OFDM symbol and obtains the first frame head, the second frame head is obtained using synchronizing sequence modulation OFDM symbol；
Transmit-Receive Unit, for the first frame head and the second frame head to be sent to reception successively as the frame preamble signal of physical frame
End equipment, frame preamble signal are used to indicate the initial time of physical frame.
Wherein, the first frame head includes detection frame head and/or coarse synchronization frame head, and detection frame head identifies for receiving device
Physical frame, coarse synchronization frame head are used for the initial time of receiving device rough estimate physical frame；Second frame head includes fine same
Step-frame head, fine synchronization frame head accurately estimate the initial time of physical frame for receiving device.
In a kind of possible design, predetermined sequence includes the sequence that length is the first length, and OFDM symbol includes length
OFDM symbol for the first length.Correspondingly, processing unit is specifically used for when generating OFDM symbol according to predetermined sequence：It is right
Length carries out fast fourier inverse transformation for the sequence of the first length, obtains the OFDM symbol that length is the first length.
In a kind of possible design, processing unit is specifically used for when repetition OFDM symbol obtains the first frame head：It will be long
It spends to be repeated as many times for the OFDM symbol of the first length and obtains detection frame head.
In a kind of possible design, processing unit using synchronizing sequence modulation OFDM symbol obtain the second frame head when,
It is specifically used for：Synchronizing sequence modulation length is used to obtain fine synchronization frame head for the OFDM symbol of the first length.
In a kind of possible design, predetermined sequence further includes the sequence that length is the second length, and OFDM symbol further includes
Length is the OFDM symbol of the second length, and the first length is less than the second length.
Correspondingly, processing unit is specifically used for when generating OFDM symbol according to predetermined sequence：It is the second length to length
Sequence carry out fast fourier inverse transformation, obtain length be the second length OFDM symbol.
Correspondingly, processing unit is specifically used for when repetition OFDM symbol obtains the first frame head：It is the second length by length
OFDM symbol be repeated as many times obtain coarse synchronization frame head.
In a kind of possible design, length is that sub-carrier frequencies are used in the OFDM symbol of the second length with length
Sub-carrier frequencies used in the OFDM symbol of first length are orthogonal.
In a kind of possible design, processing unit is additionally operable to：Transmit-Receive Unit using the first frame head and the second frame head as
The frame preamble signal of physical frame is sent to before receiving device successively, and OFDM symbol of the length for the first length is repeated as many times
Coarse synchronization buffering frame head is obtained, coarse synchronization buffering frame head is used to fill up between coarse synchronization frame head and fine synchronization frame head
Period.
In a kind of possible design, the transmission sequence of the frame preamble signal of physical frame is from front to back：Detect frame head, thick
Slightly synchronizing frame head, coarse synchronization buffering frame head, fine synchronization frame head；Or detection frame head, coarse synchronization frame head, fine synchronization frame
Head.
In a kind of possible design, synchronizing sequence is the sequence with strong autocorrelation, and the sequence of strong autocorrelation is
It is more than first threshold, and the matching value with itself being delayed is less than the sequence of second threshold with the matching value of itself.
The third aspect, the embodiment of the present application additionally provide a kind of communication equipment, which, which has, realizes above-mentioned first
The function of first equipment behavior in aspect method example.Function can pass through hardware realization.The structure of communication equipment includes depositing
Reservoir, processor and transceiver；Memory, for storing computer-readable program；Processor calls storage in memory
Instruction, perform above-mentioned first aspect any one realization method provide method, to realize the equipment in second aspect
The function for the processing unit that structure includes；Transceiver, for receiving data and/or transmission data under the control of a processor,
With the function for the Transmit-Receive Unit that the structure for realizing the equipment in second aspect includes.
Fourth aspect also provides a kind of computer storage media in the embodiment of the present application, software is stored in the storage medium
Program, the software program can realize first aspect or above-mentioned first aspect when being read and executed by one or more processors
The method that any one realization method provides.
5th aspect, the embodiment of the present application additionally provides a kind of communication system, the communication system include sending ending equipment and
Receiving device.Wherein, sending ending equipment is used to perform any one realization side of above-mentioned first aspect or above-mentioned first aspect
The method that formula provides, receiving device is used to perform above-mentioned second aspect or any one realization method of above-mentioned second aspect carries
The method of confession.
Technical solution provided by the embodiments of the present application, the OFDM symbol that sending ending equipment repeats to be generated by predetermined sequence obtain
First frame head, and the OFDM symbol is modulated using synchronizing sequence and obtains the second frame head, such sending ending equipment can be by first
Frame head and the second frame head are sent to receiving device successively as the frame preamble signal of physical frame, so as to by frame preamble signal to
Receiving device indicates the initial time of physical frame so that receiving device is capable of the initial time of accurate judgement physical frame, carries
The reliability of high physical frame transmission between sending ending equipment and receiving device, enhances applicable broadband carrier communication
Communication system communication performance, preferably realize in the communication system of applicable broadband carrier communication between each equipment
Communication.
Description of the drawings
Fig. 1 be the invention relates to a kind of physical frame structure diagram；
Fig. 2 be the invention relates to a kind of frame preamble signal generation method flow diagram；
Fig. 3 a be the invention relates to a kind of frame preamble signal structure diagram；
Fig. 3 b be the invention relates to another frame preamble signal structure diagram；
Fig. 4 be the invention relates to a kind of equipment structure diagram；
Fig. 5 be the invention relates to another equipment structure diagram.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, the technical solution in the embodiment of the present application is carried out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall in the protection scope of this application.
PLC system is a kind of communication system transmitted using power line into row information based on power line network, due to need not
Again new communication network is set up, PLC system has the advantages such as the low, broad covered area of communications cost.Power line network is different from general
Logical data communication network, the original intention of design is transmission for power frequency electric energy, thus in power line network branch node compared with
It is more, and power line network is mounted with a large amount of different type equipment, but for data communication, power line network is one
Noise is significantly and signal is decayed serious transmission channel：On the one hand, the impedance mismatch at the branch node in power line network
The multipath effect of the signal transmitted on power line can be caused, it is serious so as to cause the signal attenuation transmitted on power line；The opposing party
Face, in power line network the electrical equipment of carry can cut-off, frequency conversion, and can wind and beat between the power line in power line network
Curved, these phenomenons are likely to result in the noise jamming increase in power line network.
In order to improve the above problem, the bandwidth carrier communication technology may be used in PLC system.Existing bandwidth carrier communication skill
Art is adjusted usually using Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, OFDM)
System, so that signal is transmitted respectively on a different frequency, so as to improve band efficiency, avoids the interference between subchannel.But
There are still following technical problems for PLC system based on the existing bandwidth carrier communication technology：First, system communication performance is limited
(such as white Gaussian noise background lower critical signal-to-noise ratio about -5dB)；Second, be limited to system communication performance, transmitting terminal need with compared with
High transmission power (up to -45dBm/Hz in working frequency range) carries out signal transmission, and the radiation that transmission process generates is to short-pass
Letter and shortwave monitor can cause severe jamming；Third, in PLC system, continuous transmission beacon frame is come when realizing between communication equipment
Clock estimation of deviation causes the waste of the communication resource；4th, communication distance is short, can not meet the needs of practical application.Similar,
Other communication systems based on the existing bandwidth carrier communication technology may also can there are above-mentioned technical problems.
The embodiment of the present application provides a kind of generation method and equipment of frame preamble signal, to solve using existing broadband
Above-mentioned technical problem present in the communication system of carrier communication, so as to preferably realize applicable broadband carrier communication
Communication system in communication between each equipment.Wherein, method and apparatus is based on same application design, due to method and is set
The standby principle solved the problems, such as is similar, therefore the implementation of apparatus and method for can be with cross-reference, and overlaps will not be repeated.
Technical solution provided by the embodiments of the present application is respectively set suitable for the communication system of applicable broadband carrier communication
The scene of transmitting physical frame between standby, for example, in PLC system between each equipment transmitting physical frame scene.In the scene, send
End equipment sends physical frame to receiving device, and receiving device can carry out after receiving the physical frame according to the physical frame
Channel estimation obtains the frame data that the physical frame includes so as to obtain the channel characteristic information of the communication channel.
Several concepts involved in the embodiment of the present application are explained below：
The invention relates to physical frame be to continue for some time special electric signal, physics in power line transmission
Frame is used to carry user information.The invention relates to physical frame include at least frame preamble signal, which can
Using the start-up portion as physical frame, as shown in Figure 1, in order to receiving device can according to the frame preamble signal received come
It identifies the physical frame, and frame synchronization is carried out to be follow-up to obtain the data that physical frame includes and make according to the frame preamble signal
Prepare.It should be noted that frame preamble signal can also be used as the other parts of physical frame, such as the tail portion of physical frame, herein
It is not construed as limiting.
The invention relates to OFDM symbol be frequency orthogonal multiple-carrier signal transmission unit.According to OFDM symbol
OFDM symbol can be divided into long OFDM symbol and short OFDM symbol by the length of FFT during realization, such as long OFDM symbol is realized
When FFT length can be 2048, the length of FFT can include 1024 when short OFDM symbol is realized.
The invention relates to the first equipment and the second equipment, can be applicable broadband carrier communication communication
Arbitrary equipment in system, the first equipment are sending ending equipment, and the second equipment is receiving device.First equipment and the second equipment
Can be the equipment of same type, or different types of equipment；The quantity of first equipment can be one or more, the
The quantity of two equipment may be one or more, not limited in the present embodiment.It, can also be by the second equipment in practical application
As sending ending equipment, the first equipment is receiving device, in the case of this method of generation and the transmission of frame preamble signal with
Technical solution provided by the embodiments of the present application is identical.
Technical solution provided by the embodiments of the present application is introduced below.
The embodiment of the present application provides a kind of generation method of frame preamble signal, as shown in Fig. 2, this method includes：
S201, the first equipment to the second equipment send physical frame before, the first equipment according to predetermined sequence generate OFDM
Symbol.
Wherein, predetermined sequence includes the sequence that length is the first length, and OFDM symbol includes length for the first length
OFDM symbol.Predetermined sequence further includes the sequence that length is the second length, and OFDM symbol further includes length as the second length
OFDM symbol.First length can be less than second length, which can also be more than second length, not do herein
It limits.Hereafter by taking the first length is less than the second length as an example, the present embodiment is illustrated.
In S201, the predetermined sequence of corresponding different length, the mode of the first equipment generation OFDM symbol is including following several：
Mode one：In the case where predetermined sequence includes sequence of the length for the first length, the first equipment is to length in S201
It spends and carries out fast fourier inverse transformation for the sequence of the first length, obtain the OFDM symbol that length is the first length.With the first length
It spends for Ns, it is N that predetermined sequence, which includes length,sSequence of complex numbers S (k), OFDM symbol is that length is NsSequence s (n) for, side
The detailed process of formula one can be expressed as：
S (n)=αs·Real(IFFT(S(k))),0≤k≤Ns-1and 0≤n≤Ns- 1 formula one
In formula one, αsIt is an invariant, function Real (A) represents to take the real part of plural A.NsValue to be just whole
Number, NsValue can represent the length of sequence of complex numbers S (k), the length of sequence s (n) can also be represented, if such as NsValue
Length for 1024 S (k) He s (n) is 1024.
Function IFFT (S (k)) represents inverse fast Fourier transform (the Inverse Fast of calculated complex sequence S (k)
Fourier Transformation, IFFT).Optionally, the specific calculating process of function IFFT (S (k)) can be expressed as：
Sequence of complex numbers S (k) in formula one and formula two is illustrated as：
Wherein, set CsBe length be NsOFDM symbol used in effective subcarrier number, such as set CsIt is 100
The set of even number composition in the range of to 230.θ (k) can be value for any positive integer in positive integer, such as 0 to 15, this
In the case of can cause s (n) have relatively low peak-to-average force ratio.
Mode two：In the case where predetermined sequence includes sequence of the length for the second length, the first equipment is to length in S201
It spends and carries out fast fourier inverse transformation for the sequence of the second length, obtain the OFDM symbol that length is the second length.
Using the second length as Nt, it is N that predetermined sequence, which includes length,tSequence of complex numbers S (k), OFDM symbol is that length is Nt's
For sequence t (n), the detailed process of mode two can be expressed as：
T (n)=αt·Real(IFFT(T(k))),0≤k≤Nt-1and 0≤n≤Nt- 1 formula four
In formula four, αtIt is an invariant, function Real (A) represents to take the real part of plural A.NtValue to be just whole
Number, NtValue be more than mode one in NsValue, NtValue can represent the length of sequence of complex numbers T (k), can also table
Show the length of sequence t (n), if such as NtValue for the length of 2048 T (k) and t (n) be 2048.
Function IFFT (T (k)) represents the fast fourier inverse transformation of calculated complex sequence T (k).Optionally, function IFFT
The specific calculating process of (T (k)) can be expressed as：
Sequence of complex numbers T (k) in formula four and formula five is illustrated as：
Wherein, set CtBe length be NtOFDM symbol used in effective subcarrier number, such as set CtFor set
{201,202,209,210,217,218,225,226,233,234,……,449,450,457,458}.Ψ (k) can be taken
It is worth for any positive integer in positive integer, such as 0 to 15, can causes t (n) that there is relatively low peak-to-average force ratio in the case of this.
Optionally, length is sub-carrier frequencies used in the OFDM symbol of the second length and length is the first length
Sub-carrier frequencies used in OFDM symbol are orthogonal, phase mutual respects between each frame head included to avoid frame preamble signal
It is folded, generate interference.
It should be noted that other than aforesaid way one and mode two, the first equipment can also use in the present embodiment
Other modes generate OFDM symbol, are not limited in the present embodiment.
S202, the first equipment repeat OFDM symbol and obtain the first frame head.
After generating OFDM symbol according to predetermined sequence in S201, the first equipment repeats the OFDM in the time domain in S202
Symbol obtains the first frame head.
Wherein, the first frame head includes detection frame head and/or coarse synchronization frame head, and detection frame head identifies object for the second equipment
Frame is managed, coarse synchronization frame head is used for the initial time of the second equipment rough estimate physical frame.Wherein, the initial time of physical frame is
Refer to the initial position of physical frame in the time domain.Optionally, detection frame head can be also used for frequency offset estimation, channel equalization, letter
Make an uproar compared estimate and fading channel estimation etc., so as to improve the precision of channel estimation.
The different modes in S201 are corresponded to, the first equipment repetition OFDM symbol obtains the method packet of the first frame head in S202
It includes following several：
Method one：Mode one in corresponding S201, the first equipment is by OFDM symbol weight that length is the first length in S202
It is multiple repeatedly to obtain detection frame head.
Description in corresponding S201 above, still using the first length as Ns, it is N that predetermined sequence, which includes length,sSequence of complex numbers S
(k), it is N that OFDM symbol, which is length,sSequence S (n) for, in S202 the first equipment by length be NsSequence s (n) repeat Nd
Secondary to obtain detection frame head D (m), which can be expressed as：
D (m)=s [mod (m, Ns)], m=0,1,2 ... ..., Nd·Ns- 1 formula six
In formula six, mod (m, Ns) represent to take N to msRemainder.
By method one, the detection frame head of the first equipment generation includes multiple identical length and is accorded with for the OFDM of the first length
Number, the first equipment can use frame preamble signal of the detection frame head as physical frame, so that the second equipment receives the detection
This multiple identical OFDM symbol is averaging processing after frame head, so as to improve the gain of received signal to noise ratio, is reduced
The data processing pressure of second equipment.
Method two：Mode two in corresponding S201, the first equipment is by OFDM symbol weight that length is the second length in S202
It is multiple repeatedly to obtain coarse synchronization frame head.
Description in corresponding S201 above, still using the second length as Nt, it is N that predetermined sequence, which includes length,sSequence of complex numbers T
(k), it is N that OFDM symbol, which is length,tSequence t (n) for, in S202 the first equipment by length be NtSequence t (n) repeat Nc
Secondary to obtain coarse synchronization frame head C (m), which can be expressed as：
C (m)=t [mod (m, Nt)], m=0,1,2 ... ..., Nd·Nt- 1 formula seven
In formula seven, mod (m, Nt) represent to take N to mtRemainder.
By method two, the coarse synchronization frame head of the first equipment generation includes multiple identical length for the second length
OFDM symbol, also, coarse synchronization frame head and detection frame head are what the OFDM symbol based on different length generated, the first equipment can
To use the coarse synchronization frame head as the frame preamble signal of physical frame, the coarse synchronization that can will be received so as to the second equipment
Frame head and detection frame head are detached, and multiple identical OFDM symbols that isolated coarse synchronization frame head includes are carried out
Average treatment realizes the rough estimate to the initial time of physical frame, so as to improve the gain of received signal to noise ratio, reduces
The data processing pressure of two equipment.
S203, the first equipment obtain the second frame head using synchronizing sequence modulation OFDM symbol.
Wherein, the second frame head includes fine synchronization frame head, and fine synchronization frame head accurately estimates physical frame for the second equipment
Initial time.Optionally, fine synchronization frame head can also include fine synchronization buffering frame head, and fine synchronization buffering frame head is used
It the time corresponding to process in the initial time for filling up the second equipment estimation physical frame, avoids because the second equipment is in this period
It inside misses subsequent frame data and causes physical frame transmission failure.
In S203, the first equipment uses synchronizing sequence modulation length to obtain fine synchronization frame for the OFDM symbol of the first length
Head.
With reference to the description in S201 above, still using the first length as Ns, it is N that predetermined sequence, which includes length,sSequence of complex numbers S
(k), it is N that OFDM symbol, which is length,sSequence S (n) for, the first equipment uses synchronizing sequence modulation length as N in S203s's
Sequence s (n) obtains fine synchronization frame head F (m), which can be expressed as：
In formula eight, P (i) can represent that length is NfSynchronizing sequence, RNs(j) it is N that can represent lengthsUnit square
Shape window sequence.It is to be understood that as 0≤j<NsWhen RNs(j)=1, the RN when j takes other valuess(j)=0.
By S203, the first equipment can use frame preamble signal of the fine synchronization frame head as physical frame, so as to
After two equipment receive the fine synchronization frame head, the required computing cross-correlation of initial time of accurate estimation physical frame is reduced
Number, so as to reduce the complexity of the calculating process of the initial time of this accurate estimation physical frame, reduce the second equipment
Hardware spending and data processing pressure.
Optionally, synchronizing sequence is the sequence with strong autocorrelation, and the sequence of the strong autocorrelation is with itself
It is more than first threshold, and the matching value with itself being delayed is less than the sequence of second threshold with value.Preferably, the strong autocorrelation
Sequence can be with the matching value of itself maximum, and with itself delay matching value minimum sequence.For example, synchronizing sequence can be with
It is sequence { 0,0,0,0,0,0,1,1,0,0,0,0,1,1,1,1,0,0,1,1,0,0,1,1,1,1,1,1,1,1 }.Due to synchronization
Sequence is the sequence for having strong autocorrelation, therefore the first equipment can use the fine synchronization frame that the synchronizing sequence is modulated
Frame preamble signal of the head as physical frame, can be further reduced essence after the second equipment receives the fine synchronization frame head
The really number of the required computing cross-correlation of initial time of estimation physical frame, so as to substantially reduce rising for accurate estimation physical frame
The complexity of the calculating process at moment beginning.
It should be noted that may be performed simultaneously the two steps of S202 and S203, performed after S202 can also be first carried out
S203 performs S202 after can also first carrying out S203, is not limited in the embodiment of the present application.
First frame head and the second frame head are sent to second by S204, the first equipment successively as the frame preamble signal of physical frame
Equipment, the frame preamble signal are used to indicate the initial time of physical frame.
Wherein, physical frame includes at least frame preamble signal and frame data, the initial time of physical frame refer to physical frame when
Initial position on domain.As shown in Figure 3a, the transmission sequence of the frame preamble signal of physical frame may be from elder generation to rear in S204：
Detect frame head, coarse synchronization frame head, fine synchronization frame head.
Optionally, before S204, length for the OFDM symbol of the first length is repeated as many times and obtains roughly by the first equipment
Sync buffering frame head, coarse synchronization buffering frame head are used to fill up the time between coarse synchronization frame head and fine synchronization frame head
Section.In this way, the first equipment can buffer frame head come when filling up the starting of the second equipment rough estimate physical frame by coarse synchronization
Time corresponding to the process at quarter, caused by avoiding when the second equipment is during this period of time not received by fine synchronization frame head
Frame synchronization fails, even physical frame transmission failure.
Description in corresponding S201 above, still using the first length as Ns, it is N that predetermined sequence, which includes length,sSequence of complex numbers S
(k), it is N that OFDM symbol, which is length,sSequence S (n) for, in this step the first equipment by length be NsSequence s (n) repeat
NbSecondary to obtain coarse synchronization buffering frame head B (m), coarse synchronization buffering frame head B (m) can be expressed as：
B (m)=s [mod (m, Ns)], m=0,1,2 ... ..., Nb·Ns- 1 formula nine
In formula nine, mod (m, Ns) represent to take N to msRemainder.
Optionally, thick sync buffering frame head can be also used for frequency offset estimation, channel equalization, signal-to-noise ratio (SNR) estimation and channel
Decay behavior etc., so as to further improve the precision of channel estimation.
Optionally, as shown in Figure 3b, the transmission sequence of the frame preamble signal of physical frame can be after from elder generation：Detection frame
Head, coarse synchronization frame head, coarse synchronization buffering frame head, fine synchronization frame head.
It should be noted that the first frame head and the second frame head can be sent respectively to second and set by the first equipment in S204
It is standby, the first frame head and the second frame head can also be sent jointly to the second equipment, are not construed as limiting herein.
A kind of generation method of frame preamble signal provided by the embodiments of the present application sends object in the first equipment to the second equipment
Before managing frame, the OFDM symbol that the first equipment repeats to be generated by predetermined sequence obtains the first frame head, and modulate using synchronizing sequence
The OFDM symbol obtains the second frame head, such first equipment can using the first frame head and the second frame head as the frame of physical frame before
It leads signal and is sent to the second equipment successively, so as to indicate the initial time of physical frame to the second equipment by frame preamble signal, make
The initial time that the second equipment is capable of accurate judgement physical frame is obtained, the physical frame improved between the first equipment and the second equipment passes
Defeated reliability, enhances the communication performance of the communication system of applicable broadband carrier communication, preferably realizes using wide
Communication in communication system with carrier communication between each equipment.
A kind of generation method of frame preamble signal provided by the embodiments of the present application can solve to apply existing bandwidth carrier
Technical problem present in the communication system of the communication technology, so as to preferably realize the logical of applicable broadband carrier communication
It is logical between each equipment in communication in letter system between each equipment, the especially PLC system of applicable broadband carrier communication
Letter, is embodied in the following aspects：
In a first aspect, the first equipment indicates the initial time of physical frame by the frame preamble signal of generation to the second equipment,
The reliability of the physical frame transmission between the first equipment and the second equipment is improved, enhances applicable broadband carrier communication
The communication performance of communication system, so that the first equipment and the second equipment is under the poor environment of noise, such as in Gauss
In the environment of white noise background lower critical signal-to-noise ratio about -18dB, the detection and first of physical frame can be reliablely and stablely realized
Frame synchronization between equipment and the second equipment, and the process of the frame data for subsequent demodulation physical frame provides characteristic of channel letter
Breath.
Second aspect, due to the enhancing of the communication performance of the communication system of applicable broadband carrier communication, the first equipment
It can use compared with low transmitting power to the second equipment transmitting physical frame, during reducing the first equipment transmitting physical frame
Transmission power loss, avoid using the mistake compared with high transmitting power (working frequency range in up to -45dBm/Hz) transmitting physical frame
The radiation generated in journey severe jamming caused by short wave communication and shortwave monitor.
The third aspect realizes that clock jitter is estimated relative to continuous transmission beacon frame between communication equipment in the prior art
Method, the first equipment by frame preamble signal to the second equipment indicate physical frame initial time, both realized the first equipment
Clock jitter estimation between the second equipment, in turn avoids when without transmitting physical frame between the first equipment and the second equipment
The waste of the communication resource caused by still transmitting beacon frame.
Fourth aspect due to the enhancing of the communication performance of the communication system of applicable broadband carrier communication, extends
Communication distance between one equipment and the second equipment so as to meet multiple practical applications demand, such as realizes carry on ground
The communication between each equipment in buried power gauze network.
To sum up, the embodiment of the present application provides a kind of generation method of frame preamble signal and preferably realizes that applicable broadband carrier wave leads to
Communication in the communication system of letter technology between each equipment.
Based on same application design, the embodiment of the present application additionally provides a kind of equipment, which can realize that Fig. 2 is corresponding
The method that the first equipment (i.e. sending ending equipment) performs in the method that embodiment provides.As shown in fig.4, the equipment includes：Place
Unit 401 and Transmit-Receive Unit 402 are managed, wherein,
Processing unit 401, for before physical frame is sent to receiving device, orthogonal frequency to be generated according to predetermined sequence
It is multiplexed OFDM symbol；It repeats OFDM symbol and obtains the first frame head；Second frame head is obtained using synchronizing sequence modulation OFDM symbol；
Transmit-Receive Unit 402, for the first frame head and the second frame head to be sent to successively as the frame preamble signal of physical frame
Receiving device, frame preamble signal are used to indicate the initial time of physical frame.
Optionally, the first frame head includes detection frame head and/or coarse synchronization frame head, and detection frame head is known for receiving device
Other physical frame, coarse synchronization frame head are used for the initial time of receiving device rough estimate physical frame；Second frame head includes fine
Synchronizing frame head, fine synchronization frame head accurately estimate the initial time of physical frame for receiving device.
Optionally, predetermined sequence includes the sequence that length is the first length, and OFDM symbol includes length for the first length
OFDM symbol.
Processing unit 401 is specifically used for when generating OFDM symbol according to predetermined sequence：To the sequence that length is the first length
Row carry out fast fourier inverse transformation, obtain the OFDM symbol that length is the first length.
Optionally, processing unit 401 is specifically used for when repetition OFDM symbol obtains the first frame head：It is first by length
The OFDM symbol of length, which is repeated as many times, obtains detection frame head.
Optionally, processing unit 401 is specifically used for when obtaining the second frame head using synchronizing sequence modulation OFDM symbol：
Synchronizing sequence modulation length is used to obtain fine synchronization frame head for the OFDM symbol of the first length.
Optionally, predetermined sequence further includes the sequence that length is the second length, and OFDM symbol further includes length as the second length
The OFDM symbol of degree, the first length are less than the second length.
Processing unit 401 is specifically used for when generating OFDM symbol according to predetermined sequence：To the sequence that length is the second length
Row carry out fast fourier inverse transformation, obtain the OFDM symbol that length is the second length.
Processing unit 401 is specifically used for when repetition OFDM symbol obtains the first frame head：It is the second length by length
OFDM symbol is repeated as many times and obtains coarse synchronization frame head.
Optionally, length is sub-carrier frequencies used in the OFDM symbol of the second length and length is the first length
Sub-carrier frequencies used in OFDM symbol are orthogonal.
Optionally, processing unit 401 is additionally operable to：In Transmit-Receive Unit 402 using the first frame head and the second frame head as physical frame
Frame preamble signal be sent to before receiving device successively, length is repeated as many times for the OFDM symbol of the first length obtain it is thick
Slightly sync buffering frame head, coarse synchronization buffering frame head are used to fill up the time between coarse synchronization frame head and fine synchronization frame head
Section.
Optionally, the transmission sequence of the frame preamble signal of physical frame is from front to back：Detect frame head, coarse synchronization frame head,
Coarse synchronization buffering frame head, fine synchronization frame head；Or detection frame head, coarse synchronization frame head, fine synchronization frame head.
Optionally, synchronizing sequence is the sequence with strong autocorrelation, and the sequence of strong autocorrelation is the matching with itself
Value is more than first threshold, and the matching value with itself being delayed is less than the sequence of second threshold.
It should be noted that it is schematical, only a kind of logic function to the division of unit in the embodiment of the present application
It divides, can there is other dividing mode in actual implementation.Each functional unit in embodiments herein can be integrated in
In one processing unit or each unit is individually physically present, can also two or more units be integrated in one
In a unit.The form that hardware had both may be used in above-mentioned integrated unit is realized, can also use the form of SFU software functional unit
It realizes.
If the integrated unit is realized in the form of SFU software functional unit and is independent product sale or uses
When, it can be stored in a computer read/write memory medium.Based on such understanding, the technical solution of the application is substantially
The part to contribute in other words to the prior art or all or part of the technical solution can be in the form of software products
It embodies, which is stored in a storage medium, is used including some instructions so that a computer
It is each that equipment (can be personal computer, server or the network equipment etc.) or processor (processor) perform the application
The all or part of step of embodiment the method.And aforementioned storage medium includes：USB flash disk, mobile hard disk, read-only memory
(Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or CD
Etc. the various media that can store program code.
Based on same application design, the embodiment of the present application additionally provides a kind of equipment, which uses the corresponding implementations of Fig. 2
The method that the first equipment (i.e. sending ending equipment) performs in the method that example provides, can be identical with equipment shown in Fig. 4 set
It is standby.As shown in fig.5, the equipment includes：Processor 501, transceiver 502 and memory 503, wherein：
Processor 501 for reading the program in memory 503, performs following process：
Before control transceiver 502 sends physical frame to receiving device, orthogonal frequency division multiplexing is generated according to predetermined sequence
Use OFDM symbol；It repeats OFDM symbol and obtains the first frame head；Second frame head is obtained using synchronizing sequence modulation OFDM symbol；Control
Transceiver 502 is sent to receiving device successively using the first frame head and the second frame head as the frame preamble signal of physical frame, before frame
Lead the initial time that signal is used to indicate physical frame；
Transceiver 502, for the transceiving data under the control of processor 501.
Optionally, the first frame head includes detection frame head and/or coarse synchronization frame head, and detection frame head is known for receiving device
Other physical frame, coarse synchronization frame head are used for the initial time of receiving device rough estimate physical frame；Second frame head includes fine
Synchronizing frame head, fine synchronization frame head accurately estimate the initial time of physical frame for receiving device.
Optionally, predetermined sequence includes the sequence that length is the first length, and OFDM symbol includes length for the first length
OFDM symbol.Processor 501 is specifically used for when generating OFDM symbol according to predetermined sequence：To the sequence that length is the first length
Row carry out fast fourier inverse transformation, obtain the OFDM symbol that length is the first length.
Optionally, processor 501 is specifically used for when repetition OFDM symbol obtains the first frame head：It is the first length by length
The OFDM symbol of degree, which is repeated as many times, obtains detection frame head.
Optionally, processor 501 is specifically used for when obtaining the second frame head using synchronizing sequence modulation OFDM symbol：It adopts
Fine synchronization frame head is obtained with OFDM symbol of the synchronizing sequence modulation length for the first length.
Optionally, predetermined sequence further includes the sequence that length is the second length, and OFDM symbol further includes length as the second length
The OFDM symbol of degree, the first length are less than the second length.
Processor 501 is specifically used for when generating OFDM symbol according to predetermined sequence：To the sequence that length is the second length
Fast fourier inverse transformation is carried out, obtains the OFDM symbol that length is the second length.Processor 501 is obtained in repetition OFDM symbol
During the first frame head, it is specifically used for：Length for the OFDM symbol of the second length is repeated as many times and obtains coarse synchronization frame head.
Optionally, length is sub-carrier frequencies used in the OFDM symbol of the second length and length is the first length
Sub-carrier frequencies used in OFDM symbol are orthogonal.
Optionally, processor 501 is additionally operable to：In control transceiver 502 using the first frame head and the second frame head as physical frame
Frame preamble signal be sent to before receiving device successively, length is repeated as many times for the OFDM symbol of the first length obtain it is thick
Slightly sync buffering frame head, coarse synchronization buffering frame head are used to fill up the time between coarse synchronization frame head and fine synchronization frame head
Section.
Optionally, the transmission sequence of the frame preamble signal of physical frame is from front to back：Detect frame head, coarse synchronization frame head,
Coarse synchronization buffering frame head, fine synchronization frame head；Or detection frame head, coarse synchronization frame head, fine synchronization frame head.
Optionally, synchronizing sequence is the sequence with strong autocorrelation, and the sequence of strong autocorrelation is the matching with itself
Value is more than first threshold, and the matching value with itself being delayed is less than the sequence of second threshold.
Processor 501, transceiver 502 and memory 503 are connected with each other by bus；Bus can be that external components are mutual
Even standard (peripheral component interconnect, PCI) bus or expanding the industrial standard structure (extended
Industry standard architecture, EISA) bus etc..The bus can be divided into address bus, data/address bus,
Controlling bus etc..
Wherein, in Figure 5, bus architecture can include the bus and bridge of any number of interconnection, specifically by processor 501
The various circuits for the memory that the one or more processors and memory 503 of representative represent link together.Bus architecture is also
Various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like can be linked together, these are all
It is it is known in the art, therefore, it will not be further described herein.Bus interface provides interface.Transceiver 502 can
To be multiple element, i.e., including transmitter and transceiver, provide the list for communicating over a transmission medium with various other devices
Member.Processor 501 is responsible for bus architecture and common processing, and memory 503 can store processor 501 and perform operation
When used data.
Optionally, processor 501 can be central processing unit, application-specific integrated circuit (Application Specific
Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array,
) or Complex Programmable Logic Devices (Complex Programmable Logic Device, CPLD) FPGA.
A kind of computer storage media is additionally provided in the embodiment of the present application, software program is stored in the storage medium, it should
Software program can realize that (i.e. transmitting terminal is set the first equipment in above-described embodiment when being read and executed by one or more processors
It is standby) perform method.
A kind of equipment is additionally provided in the embodiment of the present application, (is sent out including being used to perform the first equipment in above-described embodiment
Sending end equipment) perform method at least one chip.
The embodiment of the present application provides a kind of computer program product for including instruction, when run on a computer,
Computer is allowd to perform the method that the first equipment (i.e. sending ending equipment) performs in above-described embodiment.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware can be used in the application
Apply the form of example.Moreover, the computer for wherein including computer usable program code in one or more can be used in the application
The computer program production that usable storage medium is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to the flow according to the method for the embodiment of the present application, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
The processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices is generated for real
The device of function specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction generation being stored in the computer-readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps are performed on calculation machine or other programmable devices to generate computer implemented processing, so as in computer or
The instruction offer performed on other programmable devices is used to implement in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although the preferred embodiment of the application has been described, those skilled in the art once know basic creation
Property concept, then can make these embodiments other change and modification.So appended claims be intended to be construed to include it is excellent
It selects embodiment and falls into all change and modification of the application range.
Obviously, those skilled in the art can carry out the embodiment of the present application various modification and variations without departing from this Shen
Please embodiment spirit and scope.In this way, if these modifications and variations of the embodiment of the present application belong to the application claim
And its within the scope of equivalent technologies, then the application is also intended to include these modifications and variations.
Claims (20)
1. a kind of generation method of frame preamble signal, which is characterized in that including：
Before the first equipment sends physical frame to the second equipment, first equipment generates orthogonal frequency division multiplexing according to predetermined sequence
Use OFDM symbol；
First equipment repeats the OFDM symbol and obtains the first frame head；
First equipment modulates the OFDM symbol using synchronizing sequence and obtains the second frame head；
First equipment sends out first frame head and second frame head as the frame preamble signal of the physical frame successively
It send to second equipment, the frame preamble signal is used to indicate the initial time of the physical frame.
2. the method as described in claim 1, which is characterized in that first frame head includes detection frame head and/or coarse synchronization
Frame head, the detection frame head identify the physical frame for second equipment, and the coarse synchronization frame head is used for described second
The initial time of physical frame described in equipment rough estimate；
Second frame head includes fine synchronization frame head, and the fine synchronization frame head is for described in second equipment accurately estimation
The initial time of physical frame.
3. method as claimed in claim 1 or 2, which is characterized in that the predetermined sequence includes the sequence that length is the first length
Row, the OFDM symbol include the OFDM symbol that length is the first length；
First equipment generates OFDM symbol according to predetermined sequence, including：
First equipment carries out fast fourier inverse transformation to sequence of the length for the first length, and obtaining the length is
The OFDM symbol of first length.
4. method as claimed in claim 3, which is characterized in that first equipment repeats the OFDM symbol and obtains first frame
Head, including：
The length for the OFDM symbol of the first length is repeated as many times and obtains the detection frame head by first equipment.
5. the method as described in claim 1 or 3, which is characterized in that first equipment is using described in synchronizing sequence modulation
OFDM symbol obtains the second frame head, including：
It is described fine that first equipment uses the synchronizing sequence modulation length to be obtained for the OFDM symbol of the first length
Synchronizing frame head.
6. the method as described in claim 1 or 3, which is characterized in that the predetermined sequence further includes length as the second length
Sequence, the OFDM symbol further include the OFDM symbol that length is the second length, and first length is less than second length；
First equipment generates OFDM symbol according to predetermined sequence, including：
First equipment carries out fast fourier inverse transformation to sequence of the length for the second length, and obtaining the length is
The OFDM symbol of second length；
First equipment repeats the OFDM symbol and obtains the first frame head, including：
The length for the OFDM symbol of the second length is repeated as many times and obtains the coarse synchronization frame head by first equipment.
7. method as claimed in claim 6, which is characterized in that the length is son used in the OFDM symbol of the second length
Carrier frequency is orthogonal for sub-carrier frequencies used in the OFDM symbol of the first length with the length.
8. the method as described in claim 3 to 7 is any, which is characterized in that first equipment is by first frame head and institute
It states before the second frame head is sent to second equipment successively as the frame preamble signal of the physical frame, further includes：
The length for the OFDM symbol of the first length is repeated as many times and obtains coarse synchronization buffering frame head, institute by first equipment
Coarse synchronization buffering frame head is stated to be used to fill up the period between coarse synchronization frame head and fine synchronization frame head.
9. the method as described in claim 2 to 7 is any, which is characterized in that the transmission of the frame preamble signal of the physical frame is suitable
Sequence is after from elder generation：Detect frame head, coarse synchronization frame head, coarse synchronization buffering frame head, fine synchronization frame head；Or detection frame
Head, coarse synchronization frame head, fine synchronization frame head.
10. the method as described in claim 1 to 7 is any, which is characterized in that the synchronizing sequence is with strong autocorrelation
Sequence.
11. a kind of equipment, which is characterized in that including：
Processing unit, for before physical frame is sent to receiving device, Orthogonal Frequency Division Multiplexing to be generated according to predetermined sequence
OFDM symbol；It repeats the OFDM symbol and obtains the first frame head；The OFDM symbol is modulated using synchronizing sequence and obtains the second frame
Head；
Transmit-Receive Unit, for first frame head and second frame head to be sent to successively as the frame preamble signal of physical frame
Receiving device, the frame preamble signal are used to indicate the initial time of the physical frame.
12. equipment as claimed in claim 11, which is characterized in that first frame head is same including detection frame head and/or roughly
Step-frame head, the detection frame head identify the physical frame for the receiving device, and the coarse synchronization frame head is for described
The initial time of physical frame described in receiving device rough estimate；
Second frame head includes fine synchronization frame head, and the fine synchronization frame head accurately estimates institute for the receiving device
State the initial time of physical frame.
13. the equipment as described in claim 11 or 12, which is characterized in that the predetermined sequence includes length for the first length
Sequence, the OFDM symbol include the OFDM symbol that length is the first length；
The processing unit is specifically used for when generating OFDM symbol according to predetermined sequence：
Fast fourier inverse transformation is carried out to sequence of the length for the first length, obtains the length as the first length
OFDM symbol.
14. equipment as claimed in claim 13, which is characterized in that the processing unit obtains the repeating the OFDM symbol
During one frame head, it is specifically used for：
The length for the OFDM symbol of the first length is repeated as many times and obtains the detection frame head.
15. the equipment as described in claim 11 or 13, which is characterized in that the processing unit is modulating institute using synchronizing sequence
When stating OFDM symbol and obtaining the second frame head, it is specifically used for：
The synchronizing sequence is used to modulate the length and obtains the fine synchronization frame head for the OFDM symbol of the first length.
16. the equipment as described in claim 11 or 13, which is characterized in that the predetermined sequence further includes length as the second length
Sequence, the OFDM symbol further include length be the second length OFDM symbol, first length be less than described second length
Degree；
The processing unit is specifically used for when generating OFDM symbol according to predetermined sequence：
Fast fourier inverse transformation is carried out to sequence of the length for the second length, obtains the length as the second length
OFDM symbol；
The processing unit is specifically used for when the repetition OFDM symbol obtains the first frame head：
The length for the OFDM symbol of the second length is repeated as many times and obtains the coarse synchronization frame head.
17. equipment as claimed in claim 16, which is characterized in that the length is used in the OFDM symbol of the second length
Sub-carrier frequencies are orthogonal for sub-carrier frequencies used in the OFDM symbol of the first length with the length.
18. the equipment as described in claim 13 to 17 is any, which is characterized in that the processing unit is additionally operable to：
The Transmit-Receive Unit using first frame head and second frame head as the physical frame frame preamble signal successively
It is sent to before the receiving device, the length repeatedly is obtained coarse synchronization for the OFDM symbol of the first length delays
Frame head is rushed, the coarse synchronization buffering frame head is used to fill up the period between coarse synchronization frame head and fine synchronization frame head.
19. the equipment as described in claim 12 to 17 is any, which is characterized in that the transmission of the frame preamble signal of the physical frame
Sequentially it is from front to back：Detect frame head, coarse synchronization frame head, coarse synchronization buffering frame head, fine synchronization frame head；Or detection frame
Head, coarse synchronization frame head, fine synchronization frame head.
20. the equipment as described in claim 11 to 17 is any, which is characterized in that the synchronizing sequence is with strong autocorrelation
Sequence.
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| CN201810105597.4A CN108270714A (en) | 2018-02-02 | 2018-02-02 | A kind of generation method and equipment of frame preamble signal |
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| CN201810105597.4A CN108270714A (en) | 2018-02-02 | 2018-02-02 | A kind of generation method and equipment of frame preamble signal |
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| CN114980295A (en) * | 2021-02-19 | 2022-08-30 | 华为技术有限公司 | Wireless communication method and device |
| CN114980295B (en) * | 2021-02-19 | 2024-01-16 | 华为技术有限公司 | Wireless communication method and device |
| CN114945210A (en) * | 2022-05-06 | 2022-08-26 | 广州芯之联科技有限公司 | Radio frequency signal gain control method, system, device and medium |
| CN114945210B (en) * | 2022-05-06 | 2024-02-09 | 广州芯之联科技有限公司 | Radio frequency signal gain control method, system, device and medium |
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Application publication date: 20180710 |