CN104038461B - Sign synchronization and channel estimation methods, device and system - Google Patents
Sign synchronization and channel estimation methods, device and system Download PDFInfo
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- CN104038461B CN104038461B CN201310068375.7A CN201310068375A CN104038461B CN 104038461 B CN104038461 B CN 104038461B CN 201310068375 A CN201310068375 A CN 201310068375A CN 104038461 B CN104038461 B CN 104038461B
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Abstract
The invention discloses a kind of sign synchronization and channel estimation methods, device and system, belong to mobile communication technology field.The synchronization and channel estimation methods include：The first training sequence is generated, the first training sequence is used for sign synchronization and channel estimation simultaneously；The signal to be sent for being provided with the first training sequence is sent to receiving terminal, sign synchronization and channel estimation are carried out for the second training sequence of sign synchronization and channel estimation while generation so as to receiving terminal according to reception signal and receiving terminal.Solve in the prior art, for the training sequence and separate for the training sequence of channel estimation of synchronization, occupy the bandwidth of two sequences, the problem of data transmission efficiency is low caused by；Having reached transmitting terminal only needs to set a training sequence in data to be sent, and is synchronized and channel estimation simultaneously using the training sequence, reduces the bandwidth of training sequence occupancy, improves the effect of system efficiency of transmission.
Description
Technical field
The present invention relates to mobile communication technology field, more particularly to a kind of synchronous and channel estimation methods, device and system.
Background technology
In multi-carrier communications systems, signal is transmitted into receiving terminal by wireless channel.However, due to being transmitted across in signal
Cheng Zhong, signal have time delay in time domain and due to being influenceed by multidiameter delay, and the waveform of previous symbol can expand to
On other symbols, so in order to obtain the original position of symbol, so as to eliminate the interference of other symbols, system, which needs to dock, collects mail
Number carry out sign synchronization；
In addition, in signals transmission, because receiving terminal can receive the signal from different paths, the letter in different paths
Phase when number reaching receiving terminal is different；And because signal is influenceed in communication process by barrier in transmission path,
Signal can produce shade behind barrier, so the reception signal that receiving terminal receives can be in fading condition.In order to resist
The influence of multipath fading and shadow fading, so as to obtain correct demodulation result in receiving terminal, system needs to enter reception signal
Row channel estimation.
A kind of existing synchronous method, including：Transmitting terminal will be provided with the to be sent of training sequence for sign synchronization
Signal is sent to receiving terminal, so that receiving terminal is after the signal of transmitting terminal transmission is received, according to reception signal and reception
The training sequence for sign synchronization of end generation carries out sign synchronization；A kind of existing channel estimation methods, including：Transmitting terminal
The signal to be sent for being provided with training sequence for channel estimation is sent to receiving terminal, so that receiving terminal is according to reception signal
And the training sequence for channel estimation of receiving terminal generation carries out channel estimation.
During the present invention is realized, inventor has found prior art, and at least there are the following problems：
Because the process that receiving terminal carries out sign synchronization and channel estimation is two separate processes, so, transmitting
End needs to set a training sequence for being used for sign synchronization and an instruction for being used for channel estimation respectively in signal to be sent
Practice sequence；And each training sequence is required for taking certain bandwidth, the bandwidth of existing communication system is again very limited, so this
Undoubtedly to the waste of finite bandwidth.Particularly, in DMT（Discrete Multi-Tone, discrete multitone）In system, often
The bandwidth of sub-channels is narrower, thus existing scheme provide synchronous training sequence and channel estimation training sequence can take it is each
A big chunk bandwidth of subchannel, so as to cause the efficiency of transmission of system low.
The content of the invention
In order to solve in the prior art for sign synchronization training sequence and for the training sequence of channel estimation be two
Individual independent sequence, the bandwidth of two sequences is occupied, the problem of system efficiency of transmission is low caused by, the embodiment of the present invention
Provide a kind of sign synchronization and channel estimation methods, device and system.The technical scheme is as follows：
First aspect, there is provided a kind of sign synchronization and channel estimation methods, in transmitting terminal, methods described to include：
The first training sequence is generated, first training sequence is used for sign synchronization and channel estimation simultaneously；
The signal to be sent for being provided with first training sequence is sent to receiving terminal, so that the receiving terminal is according to connecing
It is same for the second training sequence of sign synchronization and channel estimation progress symbol while the collection of letters number and the receiving terminal generate
Step and channel estimation, first training sequence and second training sequence have identical sequential structure.
Further, methods described is used in discrete multitone DMT systems,
The self correlated peak of first training sequence is higher than predetermined threshold, in order to which the receiving terminal is believed according to described receive
The autocorrelation peak of second training sequence of first training sequence and receiving terminal generation in number determines institute
State the original position of symbol in reception signal；
Meanwhile
The frequency domain amplitude of first training sequence is definite value, in order to which first training sequence meets the receiving terminal
Carry out the requirement of channel estimation.
Further, it is described to send the signal to be sent for being provided with first training sequence to receiving terminal, including：
The signal to be sent is converted into optical signal by electric signal, so as to which the optical signal is sent to the reception
End.
Further, the first training sequence of the generation, including：
If first foundation sequence is X, the second basic sequence is Y, first training sequence is S；
The first foundation sequence X is generated according to the symbol lengths of the DMT systems, the first foundation sequence X includes
ZC sequences；
The second basic sequence Y is generated according to the first foundation sequence X；
The first training sequence S is generated according to the first foundation sequence X and the second basic sequence Y, described the
One training sequence S includes：
S=[0X0Y]。
Further, it is described to generate the first foundation sequence X according to the symbol lengths of the DMT systems, including：
If the symbol lengths of the DMT systems are N；
The first foundation sequence X, including：
Wherein, The first foundation sequence X is frequency domain sequence.
Further, it is described that the second basic sequence Y is generated according to the first foundation sequence X, including：
Using the inverted order conjugate sequence of the first foundation sequence X as the second basic sequence Y, the second basic sequence
Row Y includes：
Second aspect, there is provided a kind of sign synchronization and channel estimation methods, in receiving terminal, methods described to include：
The 3rd training sequence is generated, the 3rd training sequence is used for sign synchronization and channel estimation simultaneously；
The signal to be sent that transmitting terminal is sent is received, is provided with the signal to be sent while is used for sign synchronization and letter
4th training sequence of road estimation, the 3rd training sequence and the 4th training sequence have identical sequential structure；
Sign synchronization and channel estimation are carried out according to reception signal and the 3rd training sequence.
Further, methods described is used in discrete multitone DMT systems,
The self correlated peak of 3rd training sequence is higher than predetermined threshold, so as to according to the 3rd training sequence with it is described
The autocorrelation peak of the 4th training sequence in reception signal determines the original position of symbol in the reception signal；
Meanwhile
The frequency domain amplitude of 3rd training sequence is definite value, so that the 3rd training sequence meets channel estimation
Requirement.
Further, the signal to be sent for receiving transmitting terminal and sending, including：
The optical signal that transmitting terminal is sent is received, and is believed by the electric signal that the optical signal is converted to as described receive
Number.
Further, the 3rd training sequence of the generation, including：
If first foundation sequence is X, the second basic sequence is Y, the 3rd training sequence is S；
The first foundation sequence X is generated according to the symbol lengths of the DMT systems, the first foundation sequence X includes
ZC sequences；
The second basic sequence Y is generated according to the first foundation sequence X；
The 3rd training sequence S is generated according to the first foundation sequence X and the second basic sequence Y, described the
Three training sequence S include：
S=[0X0Y]。
Further, it is described to generate the first foundation sequence X according to the symbol lengths of the DMT systems, including：
If the symbol lengths of the DMT systems are N；
The first foundation sequence X, including：
Wherein, The first foundation sequence X is frequency domain sequence.
Further, it is described that the second basic sequence Y is generated according to the first foundation sequence X, including：
Using the inverted order conjugate sequence of the first foundation sequence X as the second basic sequence Y, the second basic sequence
Row Y includes：
Further, it is described according to reception signal and the 3rd training sequence carry out sign synchronization, including：
3rd training sequence is done into anti-Fourier IFFT to convert to obtain time-domain training sequence；
It is related to the conjugation of the time-domain training sequence to calculate the time domain of the reception signal, so as to true according to correlation peak
The original position of symbol in the fixed reception signal.
Further, it is described according to reception signal and the 3rd training sequence carry out channel estimation, including：
The frequency domain of the reception signal and the ratio of the 3rd training sequence are calculated, so as to obtain channel estimation value.
The third aspect, there is provided a kind of transmitting terminal, the transmitting terminal include：
Sequence generating module, for generating the first training sequence, first training sequence simultaneously for sign synchronization and
Channel estimation；
Signal transmitting module, for the pending of first training sequence of the sequence generating module generation will to be provided with
The number of delivering letters is sent to receiving terminal, is used for symbol while generation so as to the receiving terminal according to reception signal and the receiving terminal
Synchronous and channel estimation the second training sequence carries out sign synchronization and channel estimation, first training sequence and described second
Training sequence has identical sequential structure.
Further, the transmitting terminal is used in discrete multitone DMT systems,
The self correlated peak of first training sequence is higher than predetermined threshold, in order to which the receiving terminal is believed according to described receive
The autocorrelation peak of second training sequence of first training sequence and receiving terminal generation in number determines institute
State the original position of symbol in reception signal；
Meanwhile
The frequency domain amplitude of first training sequence is definite value, in order to which first training sequence meets the receiving terminal
Carry out the requirement of channel estimation.
Further, the signal transmitting module, it is additionally operable to the signal to be sent being converted into optical signal by electric signal,
So as to which the optical signal is sent to the receiving terminal.
Further, the sequence generating module, including：
Sequence setup unit for setting first foundation sequence as X, the second basic sequence is Y, first training sequence is
S；
First generation unit, it is described for generating the first foundation sequence X according to the symbol lengths of the DMT systems
First foundation sequence X includes ZC sequences.
Second generation unit, for generated according to first generation unit the first foundation sequence X generation described in
Second basic sequence Y；
3rd generation unit, for the first foundation sequence X generated according to first generation unit and described
The second basic sequence Y of two generation units generation generates the first training sequence S, and the first training sequence S includes：
S=[0X0Y]。
Further, first generation unit, including：
Length sets subelement, for setting the symbol lengths of the DMT systems as N；
First generation subelement, for generating the first foundation sequence X, the first foundation sequence X, including：
Wherein, The first foundation sequence X is frequency domain sequence.
Further, second generation unit, be additionally operable to using the inverted order conjugate sequence of the first foundation sequence X as
The second basic sequence Y, the second basic sequence Y include：
Fourth aspect, there is provided a kind of receiving terminal, it is characterised in that the receiving terminal includes：
Sequence generating module, for generating the 3rd training sequence, the 3rd training sequence simultaneously for sign synchronization and
Channel estimation；
Signal receiving module, for receiving the signal to be sent of transmitting terminal transmission, it is provided with the signal to be sent same
When the 4th training sequence for sign synchronization and channel estimation, the 3rd training sequence and the 4th training sequence have
Identical sequential structure；
Signal estimation module, generated for the reception signal received according to the signal receiving module and the sequence
The 3rd training sequence of module generation carries out sign synchronization and channel estimation.
Further, the receiving terminal is used in discrete multitone DMT systems,
The self correlated peak of 3rd training sequence is higher than predetermined threshold, so as to according to the 3rd training sequence with it is described
The autocorrelation peak of the 4th training sequence in reception signal determines the original position of symbol in the reception signal；
Meanwhile
The frequency domain amplitude of 3rd training sequence is definite value, so that the 3rd training sequence meets channel estimation
Requirement.
Further, the signal receiving module, it is additionally operable to receive the optical signal that transmitting terminal is sent, and will be believed by the light
Number electric signal being converted to is as the reception signal.
Further, the sequence generating module, including：
Sequence setup unit for setting first foundation sequence as X, the second basic sequence is Y, the 3rd training sequence is
S；
First generation unit, it is described for generating the first foundation sequence X according to the symbol lengths of the DMT systems
First foundation sequence X includes ZC sequences.
Second generation unit, for generated according to first generation unit the first foundation sequence X generation described in
Second basic sequence Y；
3rd generation unit, for the first foundation sequence X generated according to first generation unit and described
The second basic sequence Y of two generation units generation generates the 3rd training sequence S, and the 3rd training sequence S includes：
S=[0X0Y]。
Further, first generation unit, including：
Length sets subelement, for setting the symbol lengths of the DMT systems as N；
First generation subelement, for generating the first foundation sequence X, the first foundation sequence X, including：
Wherein, The first foundation sequence X is frequency domain sequence.
Further, second generation unit, be additionally operable to using the inverted order conjugate sequence of the first foundation sequence X as
The second basic sequence Y, the second basic sequence Y include：
Further, the signal estimation module, including：
Sequence converting unit, convert to obtain time domain training sequence for the 3rd training sequence to be done into anti-Fourier IFFT
Row；
First estimation unit, for calculate the time domain of the reception signal and sequence converting unit conversion it is described when
The conjugation of domain training sequence is related, so as to determine the original position of symbol in the reception signal according to correlation peak.
Further, the signal estimation module, including：
Second estimation unit, for calculating the frequency domain of the reception signal and the ratio of the 3rd training sequence, so as to
Obtain channel estimation value.
5th aspect, there is provided a kind of system, the system include above-mentioned transmitting terminal and receiving terminal.
The beneficial effect of technical scheme provided in an embodiment of the present invention is：
By generating first training sequence for sign synchronization and channel estimation, and the first instruction will be provided with simultaneously
The signal to be sent for practicing sequence is sent to receiving terminal so that after receiving terminal receives signal, according to reception signal with
And carry out sign synchronization and channel estimation for the training sequence of sign synchronization and channel estimation while receiving terminal generation；Solve
In the prior art, the training sequence for sign synchronization and the training sequence for channel estimation are separate, occupy two
The bandwidth of individual sequence, the problem of data transmission efficiency is low caused by；Having reached transmitting terminal only needs in signal to be sent
The first training sequence of middle setting, and sign synchronization and channel estimation are carried out simultaneously using first training sequence, reduce instruction
Practice the bandwidth that sequence takes, so as to improve the effect of system efficiency of transmission.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is the method flow diagram of the sign synchronization that the embodiment of the present invention one provides and channel estimation methods；
Fig. 2 is the method flow diagram of the sign synchronization that the embodiment of the present invention two provides and channel estimation methods；
Fig. 3 is the result analogous diagram when receiving terminal that the embodiment of the present invention two provides carries out sign synchronization；
Fig. 4 is the block diagram for the transmitting terminal that the embodiment of the present invention three provides；
Fig. 5 is the block diagram for the transmitting terminal that the embodiment of the present invention four provides；
Fig. 6 is the block diagram for the receiving terminal that the embodiment of the present invention five provides；
Fig. 7 is the block diagram for the receiving terminal that the embodiment of the present invention six provides；
Fig. 8 is the block diagram for the system that the embodiment of the present invention seven provides.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made below in conjunction with accompanying drawing into
One step it is described in detail, it is clear that the described embodiment only a part of embodiment of the present invention, rather than whole implementation
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
All other embodiment, belongs to the scope of protection of the invention.
Embodiment one
Fig. 1 is refer to, the sign synchronization and the method stream of channel estimation methods provided it illustrates the embodiment of the present invention one
Cheng Tu, this method include：
Step 101, transmitting terminal generates the first training sequence；
When transmitting terminal needs to send a signal to receiving terminal, transmitting terminal can give birth to according to the mode that receiving terminal is made an appointment
Into the first training sequence.Wherein, the first training sequence can be used for sign synchronization and channel estimation simultaneously.
Step 102, transmitting terminal sends the signal to be sent for being provided with the first training sequence to receiving terminal；
First training sequence of generation is arranged in signal to be sent by transmitting terminal, and will be provided with the first training sequence
Signal to be sent is sent to receiving terminal.
Step 103, the second training sequence that receiving terminal generates according to reception signal and receiving terminal carry out sign synchronization and
Channel estimation.
After transmitting terminal sends and is provided with signal to be sent to the receiving terminal of the first training sequence, receiving terminal can be corresponding
The signal for receiving transmitting terminal transmission, so as to which the second training sequence that receiving terminal generates according to reception signal and receiving terminal enters
Row sign synchronization and channel estimation.
Wherein, the first training sequence and the second training sequence have identical sequential structure.
In summary, the sign synchronization and channel estimation methods that the present embodiment provides, by generating one simultaneously for according with
Number synchronization and the first training sequence of channel estimation, and the signal to be sent for being provided with the first training sequence is sent to reception
End, so that it is same to be used for symbol after receiving terminal receives signal, while generation according to reception signal and receiving terminal
The training sequence of step and channel estimation carries out sign synchronization and channel estimation；Solve in the prior art, for sign synchronization
Training sequence and separate for the training sequence of channel estimation, occupies the bandwidth of two sequences, the data caused by
The problem of efficiency of transmission is low；Having reached transmitting terminal only needs to set the first training sequence in signal to be sent, and uses
First training sequence carries out sign synchronization and channel estimation simultaneously, reduces the bandwidth of training sequence occupancy, is so as to improve
The effect for efficiency of transmission of uniting.
Embodiment two
Fig. 2 is refer to, the sign synchronization and channel estimation methods, this method provided it illustrates the embodiment of the present invention two can
So that applied in DMT systems, this method can include：
Step 201, transmitting terminal generates the first training sequence；
When transmitting terminal needs to send a signal to receiving terminal, transmitting terminal can first generate the first training sequence.Wherein, first
Training sequence can be used for sign synchronization and channel estimation simultaneously.Due in multi-carrier communications systems, in order to preferable
Sign synchronization is realized so as to obtain the original position of symbol, the self correlated peak for the training sequence of sign synchronization can be higher than pre-
Determine threshold value；In order to preferably complete channel estimation, the frequency domain amplitude for the training sequence of channel estimation can be definite value；
So it can be definite value that the self correlated peak of the first training sequence of transmitting terminal generation, which can be higher than predetermined threshold and frequency domain amplitude,.
Specifically, transmitting terminal generates the step of the first training sequence, can include：
First of all for being easy to describe, the first foundation sequence that the symbol lengths of DMT systems generate as N, transmitting terminal can be set
Be Y for X, the second basic sequence, the first training sequence be S；
First, generate first foundation sequence according to the symbol lengths of DMT systems；
Due to the self correlated peak of the first training sequence of transmitting terminal generation can be higher than predetermined threshold and frequency domain amplitude can
Think definite value, and it is 0 that ZC sequences, which have preferable autocorrelation and the correlation of cross-correlation, so the self correlated peak of ZC sequences
Peak value be more than correlation at cross-correlation, namely peak value can be higher than predetermined threshold；And because ZC sequences have permanent envelope
Characteristic, namely frequency domain amplitude can be definite value.So when transmitting terminal generates the first training sequence, transmitting terminal can basis first
The symbol lengths generation first foundation sequence of DMT systems.Wherein, first foundation sequence is frequency domain ZC sequence.
The first foundation sequence X of transmitting terminal generation, can include：
Requiring supplementation with first point of explanation is, u is that span isPositive integer,And by
In DMT symbol lengths be usually 2 power side, so N is usually even number；
Requiring supplementation with the second point of explanation is, because first foundation sequence X includes ZC sequences, so the of transmitting terminal generation
One basic sequence X can also be Any of, wherein m is constant.In actual reality
Now, as long as guarantee first foundation sequence X is ZC sequences, specific table of the present embodiment to the first foundation sequence X of generation
Do not limited up to form.
Second, the second basic sequence Y is generated according to first foundation sequence X；
After transmitting terminal generates first foundation sequence X, transmitting terminal can generate the second basis according to first foundation sequence X
Sequence Y.
Specifically, because the time-domain signal of DMT systems must be real number signal, so transmitting terminal can be by first foundation sequence
X inverted order conjugate sequence is arranged as the second basic sequence Y, is specifically included：
It should be added that because first foundation sequence is ZC sequences, so according to ZC characteristic it is recognised that
The inverted order conjugate sequence namely the second basic sequence of one basic sequence are also ZC sequences.
3rd, the first training sequence S is generated according to first foundation sequence X and the second basic sequence Y.
After transmitting terminal generates first foundation sequence X and the second basic sequence Y, transmitting terminal can be according to first foundation sequence
Arrange X and the second basic sequence Y and generate the first training sequence.
Specifically, because the sequence length of first foundation sequence X and the second basic sequence Y is, and DMT systems
Symbol lengths are N, so transmitting terminal can mend before first foundation sequence X and respectively one 0 before the second basic sequence Y,
So as to which the first training sequence that formation sequence length is N, namely generation are used for the sequence of sign synchronization and channel estimation simultaneously, the
The expression formula of one training sequence includes：S=[0X0Y].
Step 202, transmitting terminal sends the signal to be sent for being provided with the first training sequence to receiving terminal；
After transmitting terminal generates the first training sequence, the first training sequence can be arranged on signal to be sent by transmitting terminal
In, and the signal to be sent for being provided with the first training sequence is sent to receiving terminal.Specifically, transmitting terminal can deliver letters pending
Number carry out IFFT（Inverse Fast Fourier Transformation, inversefouriertransform）, signal to be sent is changed
Into N number of DMT symbols, so N number of value in the first training sequence can be inserted respectively into N number of DMT symbols by transmitting terminal, from
And transmitting terminal sends the signal to be sent for being provided with the first training sequence to receiving terminal, so as to receiving terminal according to reception signal with
And the second training sequence of receiving terminal generation carries out sign synchronization and channel estimation.
Wherein, the second training sequence and the first training sequence have identical sequential structure, namely receiving terminal generation second
The mode that the generating mode of sequence generates the first training sequence with transmitting terminal is identical, specifically refer to step 201, no longer superfluous herein
State.
Further, since in DMT optical communication systems, signal to be sent first can be converted into light letter by transmitting terminal by electric signal
Number, so as to which the electric signal after conversion is sent to receiving terminal.Wherein, different electric signals can be converted into not sharing the same light by transmitting terminal
Strong optical signal, it will not be repeated here so as to send to receiving terminal, the present embodiment.
Step 203, receiving terminal receives the signal to be sent that transmitting terminal is sent；
After transmitting terminal sends signal to be sent to receiving terminal, receiving terminal can receive reception signal accordingly.
It should be noted that in optical communication system, the signal that receiving terminal receives is optical signal, so receiving terminal can be with
By optical signal according to intended conversion method migration into electric signal, so as to using the electric signal after conversion as reception signal.
It should be added that it is provided with the signal to be sent that transmitting terminal is sent while is used for synchronization and channel estimation
The 4th training sequence, and the 4th training sequence in the present embodiment and the first training sequence refer to same sequence, simply
It is used to distinguish and the not difference on essential meaning for the ease of description, so will not be described in great detail herein.
Step 204, receiving terminal generates the 3rd training sequence；
After receiving reception signal due to receiving terminal, sign synchronization and channel estimation can be carried out to reception signal, so,
Receiving terminal can generate the 3rd training sequence according to the training sequence generating mode predetermined with transmitting terminal.Wherein, the 3rd training sequence
Row are used for sign synchronization and channel estimation simultaneously.
It should be added that because receiving terminal and transmitting terminal are all to generate training by the generating mode made an appointment
Sequence, so the mode of receiving terminal generation training sequence may be referred to the description in step 201, it will not be repeated here；
In addition, the second training sequence and the 3rd training sequence in the present embodiment are substantially same sequence, it is simply
Facilitate description, and use different describing mode.
Step 205, the 3rd training sequence that receiving terminal generates according to reception signal and receiving terminal carry out sign synchronization and
Channel estimation.
Receiving terminal receive reception signal and generate the 3rd training sequence after, receiving terminal can according to reception signal with
And the 3rd training sequence of receiving terminal generation carries out sign synchronization and channel estimation.
Specifically, the process that receiving terminal carries out sign synchronization according to reception signal and the 3rd training sequence includes：
First, the 3rd training sequence is IFFT and obtains time-domain training sequence by receiving terminal；
Because three training sequences in the present embodiment are ZC sequences, and the autocorrelation of ZC sequences is preferable, namely training sequence
The peakedness ratio of the self correlated peak of row is higher, thus the present embodiment using the algorithm of Domain Synchronous come achieve a butt joint collect mail number symbol
It is synchronous.So receiving terminal obtains time-domain training sequence after the 3rd training sequence of frequency domain being done into IFFT conversion.
Second, the time domain that receiving terminal calculates reception signal is related to the conjugation of time-domain training sequence, so as to according to relevant peaks
Value determines the original position of symbol in reception signal.
After the 3rd training sequence is converted into time-domain training sequence by receiving terminal, receiving terminal can calculate reception signal
Time domain is related to the conjugation of time-domain training sequence, and detects the correlation being calculated, when correlation peaks are higher than predetermined threshold
During value, illustrate be now symbol in reception signal end position, then receiving terminal can be according to the first training sequence pending
Position in the number of delivering letters, the original position of symbol is determined, so as to realize time-domain symbol synchronization.Such as the symbol lengths as DMT
For 256 when, the time domain for the reception signal that receiving terminal is calculated and the conjugation correlation of time-domain training sequence as shown in figure 3, from
Fig. 3 is understood, correlation is conjugated at n=256 and reaches maximum, namely self correlated peak is higher than the correlation of other positions, so receiving
End can be determined that at self correlated peak be symbol end position, the then position according to the first training sequence in signal to be sent
The original position of symbol is can determine that, it is achieved thereby that sign synchronization.
In addition, receiving terminal can include the step of carrying out channel estimation according to reception signal and the 3rd training sequence:Connect
Receiving end calculates the frequency domain of reception signal and the ratio of the 3rd training sequence, so as to which channel estimation value be calculated.
It should be added that it is used for while receiving terminal generates according to reception signal and receiving terminal in the present embodiment
Synchronous and channel estimation the 3rd training sequence synchronizes, and is used for while generation according to reception signal and receiving terminal synchronous
The mode and OFDM of channel estimation are carried out with the 3rd training sequence of channel estimation（Orthogonal Frequency
Division Multiplexing, OFDM）Sign synchronization in system is similar with the method for channel estimation, herein
Repeat no more.
In summary, the sign synchronization and channel estimation methods that the present embodiment provides, by generating one simultaneously for according with
Number synchronization and the first training sequence of channel estimation, and the signal to be sent for being provided with the first training sequence is sent to reception
End, so that it is same to be used for symbol after receiving terminal receives signal, while generation according to reception signal and receiving terminal
The training sequence of step and channel estimation carries out sign synchronization and channel estimation；Solve in the prior art, for sign synchronization
Training sequence and separate for the training sequence of channel estimation, occupies the bandwidth of two sequences, the data caused by
The problem of efficiency of transmission is low；Having reached transmitting terminal only needs to set the first training sequence in signal to be sent, and uses
First training sequence carries out sign synchronization and channel estimation simultaneously, reduces the bandwidth of training sequence occupancy, is so as to improve
The effect for efficiency of transmission of uniting.
It should be added that the step of receiving terminal generates three training sequences in the present embodiment is only needed in step
Perform before 205, the present embodiment simply exemplified by performing in step 204, but to its specific generation opportunity not
It is specifically limited.
Embodiment three
Fig. 4 is refer to, the block diagram of the transmitting terminal provided it illustrates the embodiment of the present invention three, the transmitting terminal can be with
Including：Sequence generating module 310 and signal transmitting module 320；
Sequence generating module 310, for generating the first training sequence, first training sequence is used for sign synchronization simultaneously
And channel estimation；
Signal transmitting module 320, for first training sequence that will be provided with the sequence generating module 310 and generate
Signal to be sent send to receiving terminal, used while generation so as to the receiving terminal according to reception signal and the receiving terminal
Sign synchronization and channel estimation, first training sequence and institute are carried out in the second training sequence of sign synchronization and channel estimation
Stating the second training sequence has identical sequential structure.
In summary, the transmitting terminal that the present embodiment provides, it is used for sign synchronization and channel estimation simultaneously by generating one
The first training sequence, and the signal to be sent for being provided with the first training sequence is sent to receiving terminal, so that receiving
After termination receives signal, training while generation according to reception signal and receiving terminal for sign synchronization and channel estimation
Sequence carries out sign synchronization and channel estimation；Solve in the prior art, for the training sequence of sign synchronization and for channel
The problem of training sequence of estimation is separate, occupies the bandwidth of two sequences, and data transmission efficiency is low caused by；
Having reached transmitting terminal only needs to set the first training sequence in signal to be sent, and is entered simultaneously using first training sequence
Row sign synchronization and channel estimation, the bandwidth of training sequence occupancy is reduced, so as to improve the effect of system efficiency of transmission.
Example IV
Fig. 5 is refer to, the block diagram of the transmitting terminal provided it illustrates the embodiment of the present invention four, the transmitting terminal can be with
For in DMT systems, the transmitting terminal can to include sequence generating module 310 and signal transmitting module 320；
Sequence generating module 310, for generating the first training sequence, first training sequence is used for sign synchronization simultaneously
And channel estimation；
Signal transmitting module 320, for first training sequence that will be provided with the sequence generating module 310 and generate
Signal to be sent send to receiving terminal, used while generation so as to the receiving terminal according to reception signal and the receiving terminal
Sign synchronization and channel estimation, first training sequence and institute are carried out in the second training sequence of sign synchronization and channel estimation
Stating the second training sequence has identical sequential structure.
Further, the transmitting terminal is used in discrete multitone DMT systems,
The self correlated peak of first training sequence is higher than predetermined threshold, in order to which the receiving terminal is believed according to described receive
The autocorrelation peak of second training sequence of first training sequence and receiving terminal generation in number determines institute
State the original position of symbol in reception signal；
Meanwhile
The frequency domain amplitude of first training sequence is definite value, in order to which first training sequence meets the receiving terminal
Carry out the requirement of channel estimation.
Further, the signal transmitting module 320, it is additionally operable to the signal to be sent being converted into light letter by electric signal
Number, so as to which the optical signal is sent to the receiving terminal.
Further, the sequence generating module 310 can include：Sequence setup unit 312, the first generation unit 314,
Second generation unit 316 and the 3rd generation unit 318；
Sequence setup unit 312, for setting first foundation sequence as X, the second basic sequence is Y, the training sequence is
S；
First generation unit 314, for generating the first foundation sequence X, institute according to the symbol lengths of the DMT systems
Stating first foundation sequence X includes ZC sequences；
Second generation unit 316, for the first foundation sequence X life generated according to first generation unit 314
Into the second basic sequence Y；
3rd generation unit 318, for the first foundation sequence X that is generated according to first generation unit 314 and
The second basic sequence Y that second generation unit 316 generates generates the first training sequence S, first training
Sequence S includes：
S=[0X0Y]。
Further, first generation unit 314, including：
Length sets subelement 410, for setting the symbol lengths of the DMT systems as N；
First generation subelement 420, for generating the first foundation sequence X, the first foundation sequence X, including：
Wherein, The first foundation sequence X is frequency domain sequence.
Further, second generation unit 316, it is additionally operable to the inverted order conjugate sequence of the first foundation sequence X
As the second basic sequence Y, the second basic sequence Y includes：
In summary, the transmitting terminal that the present embodiment provides, it is used for sign synchronization and channel estimation simultaneously by generating one
The first training sequence, and the signal to be sent for being provided with the first training sequence is sent to receiving terminal, so that receiving
After termination receives signal, training while generation according to reception signal and receiving terminal for sign synchronization and channel estimation
Sequence carries out sign synchronization and channel estimation；Solve in the prior art, for the training sequence of sign synchronization and for channel
The problem of training sequence of estimation is separate, occupies the bandwidth of two sequences, and data transmission efficiency is low caused by；
Having reached transmitting terminal only needs to set the first training sequence in signal to be sent, and is entered simultaneously using first training sequence
Row sign synchronization and channel estimation, the bandwidth of training sequence occupancy is reduced, so as to improve the effect of system efficiency of transmission.
Embodiment five
Fig. 6 is refer to, the block diagram of the receiving terminal provided it illustrates the embodiment of the present invention five, the receiving terminal can be with
Including：Sequence generating module 510, signal receiving module 520 and signal estimation module 530；
Sequence generating module 510, for generating the 3rd training sequence, the 3rd training sequence is used for sign synchronization simultaneously
And channel estimation；
Signal receiving module 520, for receiving the signal to be sent of transmitting terminal transmission, it is provided with the signal to be sent
The 4th training sequence for sign synchronization and channel estimation simultaneously, the 3rd training sequence and the 4th training sequence tool
There is identical sequential structure；；
Signal estimation module 530, for the reception signal received according to the signal receiving module 520 and the sequence
The 3rd training sequence that column-generation module 510 generates carries out sign synchronization and channel estimation.
In summary, the receiving terminal that the present embodiment provides, it is used for sign synchronization and channel estimation simultaneously by generating one
The first training sequence, and the signal to be sent for being provided with the first training sequence is sent to receiving terminal, so that receiving
After termination receives signal, training while generation according to reception signal and receiving terminal for sign synchronization and channel estimation
Sequence carries out sign synchronization and channel estimation；Solve in the prior art, for the training sequence of sign synchronization and for channel
The problem of training sequence of estimation is separate, occupies the bandwidth of two sequences, and data transmission efficiency is low caused by；
Having reached transmitting terminal only needs to set the first training sequence in signal to be sent, and is entered simultaneously using first training sequence
Row sign synchronization and channel estimation, the bandwidth of training sequence occupancy is reduced, so as to improve the effect of system efficiency of transmission.
Embodiment six
Fig. 7 is refer to, the block diagram of the receiving terminal provided it illustrates the embodiment of the present invention six, the receiving terminal can be with
For in DMT systems, the receiving terminal to include：Sequence generating module 510, signal receiving module 520 and signal estimation module 530；
Sequence generating module 510, for generating the 3rd training sequence, the 3rd training sequence is used for sign synchronization simultaneously
And channel estimation；
Signal receiving module 520, for receiving the signal to be sent of transmitting terminal transmission, it is provided with the signal to be sent
The 4th training sequence for sign synchronization and channel estimation simultaneously, the 3rd training sequence and the 4th training sequence tool
There is identical sequential structure；；
Signal estimation module 530, for the reception signal received according to the signal receiving module 520 and the sequence
The 3rd training sequence that column-generation module 510 generates carries out sign synchronization and channel estimation.
Further, the receiving terminal is used in discrete multitone DMT systems,
The self correlated peak of 3rd training sequence is higher than predetermined threshold, so as to according to the 3rd training sequence with it is described
The autocorrelation peak of the 4th training sequence in reception signal determines the original position of symbol in the reception signal；
Meanwhile
The frequency domain amplitude of 3rd training sequence is definite value, so that the 3rd training sequence meets channel estimation
Requirement.
Further, the signal receiving module 520, it is additionally operable to receive the optical signal that transmitting terminal is sent, and will be by described
The electric signal that optical signal is converted to is as the reception signal.
Further, the sequence generating module 510, including：Sequence setup unit 512, the first generation unit 514,
Two generation units 516 and the 3rd generation unit 518；
Sequence setup unit 512, for setting first foundation sequence as X, the second basic sequence is Y, the training sequence is
S；
First generation unit 514, for generating the first foundation sequence X, institute according to the symbol lengths of the DMT systems
Stating first foundation sequence X includes ZC sequences；
Second generation unit 516, for the first foundation sequence X life generated according to first generation unit 514
Into the second basic sequence Y；
3rd generation unit 518, for the first foundation sequence X that is generated according to first generation unit 514 and
The second basic sequence Y that second generation unit 516 generates generates the 3rd training sequence S, the 3rd training
Sequence S includes：
S=[0X0Y]。
Further, first generation unit 514, including：
Length sets subelement 610, for setting the symbol lengths of the DMT systems as N；
First generation subelement 620, for generating the first foundation sequence X, the first foundation sequence X, including：
Wherein, The first foundation sequence X is frequency domain sequence.
Further, second generation unit 516, it is additionally operable to the inverted order conjugate sequence of the first foundation sequence X
As the second basic sequence Y, the second basic sequence Y includes：
Further, the signal estimation module 530, including：The estimation unit 534 of sequence converting unit 532 and first；
Sequence converting unit 532, convert to obtain time domain training for the 3rd training sequence to be done into anti-Fourier IFFT
Sequence；
Correlation calculation unit 534, for calculating time domain and the sequence converting unit 532 conversion of the reception signal
The conjugation of the time-domain training sequence is related, so as to determine the original position of symbol in the reception signal according to correlation peak.
Further, the signal estimation module 530, including：Ratio calculation unit 536；
Second estimation unit 536, for calculating the frequency domain of the reception signal and the ratio of the 3rd training sequence, from
And obtain channel estimation value.
In summary, the receiving terminal that the present embodiment provides, it is used for sign synchronization and channel estimation simultaneously by generating one
The first training sequence, and the signal to be sent for being provided with the first training sequence is sent to receiving terminal, so that receiving
After termination receives signal, training while generation according to reception signal and receiving terminal for sign synchronization and channel estimation
Sequence carries out sign synchronization and channel estimation；Solve in the prior art, for the training sequence of sign synchronization and for channel
The problem of training sequence of estimation is separate, occupies the bandwidth of two sequences, and data transmission efficiency is low caused by；
Having reached transmitting terminal only needs to set the first training sequence in signal to be sent, and is entered simultaneously using first training sequence
Row sign synchronization and channel estimation, the bandwidth of training sequence occupancy is reduced, so as to improve the effect of system efficiency of transmission.
Embodiment seven
Fig. 8 is refer to, the block diagram of the system provided it illustrates the embodiment of the present invention seven, the system includes transmitting
End 710 and receiving terminal 720.The detailed description of wherein transmitting terminal 710 refer to embodiment three or example IV；Receiving terminal 720
Detailed description refer to embodiment five or embodiment six, will not be described in great detail herein.
In summary, the system that the present embodiment provides, by generating one simultaneously for sign synchronization and channel estimation
First training sequence, and the signal to be sent for being provided with the first training sequence is sent to receiving terminal, so that in receiving terminal
After receiving signal, for sign synchronization and the training sequence of channel estimation while generation according to reception signal and receiving terminal
Row carry out sign synchronization and channel estimation；Solve in the prior art, estimate for the training sequence of sign synchronization and for channel
The problem of training sequence of meter is separate, occupies the bandwidth of two sequences, and data transmission efficiency is low caused by；Reach
Having arrived transmitting terminal only needs to set the first training sequence in signal to be sent, and is carried out simultaneously using first training sequence
Sign synchronization and channel estimation, the bandwidth of training sequence occupancy is reduced, so as to improve the effect of system efficiency of transmission.
It should be noted that：The system that above-described embodiment provides is when carrying out sign synchronization and channel estimation, only with above-mentioned
The division progress of each functional module, can be as needed and by above-mentioned function distribution by different for example, in practical application
Functional module is completed, i.e., the internal structure of equipment is divided into different functional modules, with complete it is described above whole or
Partial function.In addition, system and the embodiment of the method for sign synchronization and channel estimation methods that above-described embodiment provides belong to same
One design, its specific implementation process refer to embodiment of the method, repeated no more here.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
One of ordinary skill in the art will appreciate that hardware can be passed through by realizing all or part of step of above-described embodiment
To complete, by program the hardware of correlation can also be instructed to complete, described program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only storage, disk or CD etc..
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.
Claims (25)
1. a kind of sign synchronization and channel estimation methods, applied to transmitting terminal, it is characterised in that methods described includes：
If first foundation sequence is X, the second basic sequence is Y, the first training sequence is S；
The first foundation sequence X is generated according to the symbol lengths of DMT systems, the first foundation sequence X is ZC sequences；
The second basic sequence Y is generated according to the first foundation sequence X, the second basic sequence Y is first foundation sequence
Arrange X inverted order conjugate sequence；
The first training sequence S, first instruction are generated according to the first foundation sequence X and the second basic sequence Y
Practicing sequence S includes：
S=[0X0Y], first training sequence are used for sign synchronization and channel estimation simultaneously；
The signal to be sent for being provided with first training sequence is sent to receiving terminal, so that the receiving terminal is believed according to reception
Number and the receiving terminal generate while for the second training sequence of sign synchronization and channel estimation carry out sign synchronization and
Channel estimation, first training sequence and second training sequence have identical sequential structure.
2. sign synchronization according to claim 1 and channel estimation methods, it is characterised in that methods described is used for discrete more
In tone DMT systems,
The self correlated peak of first training sequence is higher than predetermined threshold, in order to which the receiving terminal is according in the reception signal
First training sequence and the receiving terminal generation second training sequence autocorrelation peak determine described in connect
The original position of symbol in the collection of letters number；
Meanwhile
The frequency domain amplitude of first training sequence is definite value, in order to which first training sequence meets that the receiving terminal is carried out
The requirement of channel estimation.
3. sign synchronization according to claim 2 and channel estimation methods, it is characterised in that described to be provided with described
The signal to be sent of one training sequence is sent to receiving terminal, including：
The signal to be sent is converted into optical signal by electric signal, so as to which the optical signal is sent to the receiving terminal.
4. sign synchronization according to claim 1 and channel estimation methods, it is characterised in that described according to DMT systems
Symbol lengths generate the first foundation sequence X, including：
If the symbol lengths of the DMT systems are N；
The first foundation sequence X, including：
<mrow>
<mi>x</mi>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msup>
<mi>e</mi>
<mrow>
<mo>-</mo>
<mi>j</mi>
<mfrac>
<mrow>
<mo>&Pi;</mo>
<mi>u</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>+</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<mfrac>
<mi>N</mi>
<mn>2</mn>
</mfrac>
<mo>-</mo>
<mn>1</mn>
</mrow>
</mfrac>
</mrow>
</msup>
<mo>;</mo>
</mrow>
Wherein,The first foundation sequence X is frequency domain sequence.
5. sign synchronization according to claim 1 and channel estimation methods, it is characterised in that described according to first base
Plinth sequence X generates the second basic sequence Y, including：
Using the inverted order conjugate sequence of the first foundation sequence X as the second basic sequence Y, the second basic sequence Y
Including：
<mrow>
<mi>y</mi>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mi>x</mi>
<msup>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>*</mo>
</msup>
<mrow>
<mo>(</mo>
<mfrac>
<mi>N</mi>
<mn>2</mn>
</mfrac>
<mo>-</mo>
<mn>1</mn>
<mo>-</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>.</mo>
</mrow>
6. a kind of sign synchronization and channel estimation methods, applied to receiving terminal, it is characterised in that methods described includes：
If first foundation sequence is X, the second basic sequence is Y, the 3rd training sequence is S；
The first foundation sequence X is generated according to the symbol lengths of DMT systems, the first foundation sequence X is ZC sequences；
The second basic sequence Y is generated according to the first foundation sequence X, the second basic sequence Y is first foundation sequence
Arrange X inverted order conjugate sequence；
The 3rd training sequence S, the 3rd instruction are generated according to the first foundation sequence X and the second basic sequence Y
Practicing sequence S includes：
S=[0X0Y], the 3rd training sequence are used for sign synchronization and channel estimation simultaneously；
The signal to be sent that transmitting terminal is sent is received, is provided with the signal to be sent while estimates for sign synchronization and channel
4th training sequence of meter, the 3rd training sequence and the 4th training sequence have identical sequential structure；
Sign synchronization and channel estimation are carried out according to reception signal and the 3rd training sequence.
7. sign synchronization according to claim 6 and channel estimation methods, it is characterised in that methods described is used for discrete more
In tone DMT systems,
The self correlated peak of 3rd training sequence is higher than predetermined threshold, so as to according to the 3rd training sequence and the reception
The autocorrelation peak of the 4th training sequence in signal determines the original position of symbol in the reception signal；
Meanwhile
The frequency domain amplitude of 3rd training sequence is definite value, so that the 3rd training sequence meets wanting for channel estimation
Ask.
8. sign synchronization according to claim 7 and channel estimation methods, it is characterised in that the reception transmitting terminal is sent
Signal to be sent, including：
Receive transmitting terminal send optical signal, and using by the electric signal that the optical signal is converted to as the reception signal.
9. sign synchronization according to claim 6 and channel estimation methods, it is characterised in that described according to DMT systems
Symbol lengths generate the first foundation sequence X, including：
If the symbol lengths of DMT systems are N；
The first foundation sequence X, including：
<mrow>
<mi>x</mi>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msup>
<mi>e</mi>
<mrow>
<mo>-</mo>
<mi>j</mi>
<mfrac>
<mrow>
<mo>&Pi;</mo>
<mi>u</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>+</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<mfrac>
<mi>N</mi>
<mn>2</mn>
</mfrac>
<mo>-</mo>
<mn>1</mn>
</mrow>
</mfrac>
</mrow>
</msup>
<mo>;</mo>
</mrow>
Wherein,The first foundation sequence X is frequency domain sequence.
10. sign synchronization according to claim 6 and channel estimation methods, it is characterised in that described according to described first
Basic sequence X generates the second basic sequence Y, including：
Using the inverted order conjugate sequence of the first foundation sequence X as the second basic sequence Y, the second basic sequence Y
Including：
<mrow>
<mi>y</mi>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mi>x</mi>
<msup>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>*</mo>
</msup>
<mrow>
<mo>(</mo>
<mfrac>
<mi>N</mi>
<mn>2</mn>
</mfrac>
<mo>-</mo>
<mn>1</mn>
<mo>-</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>.</mo>
</mrow>
11. sign synchronization according to claim 10 and channel estimation methods, it is characterised in that described according to reception signal
And the 3rd training sequence carries out sign synchronization, including：
3rd training sequence is done into anti-Fourier IFFT to convert to obtain time-domain training sequence；
It is related to the conjugation of the time-domain training sequence to calculate the time domain of the reception signal, so as to determine institute according to correlation peak
State the original position of symbol in reception signal.
12. sign synchronization according to claim 10 and channel estimation methods, it is characterised in that described according to reception signal
And the 3rd training sequence carries out channel estimation, including：
The frequency domain of the reception signal and the ratio of the 3rd training sequence are calculated, so as to obtain channel estimation value.
13. a kind of transmitting terminal, it is characterised in that the transmitting terminal includes：
Sequence generating module, including：
Sequence setup unit for setting first foundation sequence as X, the second basic sequence is Y, the first training sequence is S；
First generation unit, for generating the first foundation sequence X, the first foundation according to the symbol lengths of DMT systems
Sequence X is ZC sequences；
Second generation unit, for the first foundation sequence X generation described second generated according to first generation unit
Basic sequence Y, the second basic sequence Y are the inverted order conjugate sequences of first foundation sequence X；
3rd generation unit, for the first foundation sequence X generated according to first generation unit and second life
The second basic sequence Y into unit generation generates the first training sequence S, and the first training sequence S includes：
S=[0X0Y], first training sequence are used for sign synchronization and channel estimation simultaneously；
Signal transmitting module, for the pending of the first training sequence for being provided with the sequence generating module generation to be delivered letters
Number send to receiving terminal, be used for sign synchronization while generation so as to the receiving terminal according to reception signal and the receiving terminal
Sign synchronization and channel estimation, first training sequence and second training are carried out with the second training sequence of channel estimation
Sequence has identical sequential structure.
14. transmitting terminal according to claim 13, it is characterised in that the transmitting terminal is used for discrete multitone DMT systems
In,
The self correlated peak of first training sequence is higher than predetermined threshold, in order to which the receiving terminal is according in the reception signal
First training sequence and the receiving terminal generation second training sequence autocorrelation peak determine described in connect
The original position of symbol in the collection of letters number；
Meanwhile
The frequency domain amplitude of first training sequence is definite value, in order to which first training sequence meets that the receiving terminal is carried out
The requirement of channel estimation.
15. transmitting terminal according to claim 14, it is characterised in that
The signal transmitting module, it is additionally operable to the signal to be sent being converted into optical signal by electric signal, so as to by the light
Signal is sent to the receiving terminal.
16. transmitting terminal according to claim 13, it is characterised in that first generation unit, including：
Length sets subelement, for setting the symbol lengths of the DMT systems as N；
First generation subelement, for generating the first foundation sequence X, the first foundation sequence X, including：
<mrow>
<mi>x</mi>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msup>
<mi>e</mi>
<mrow>
<mo>-</mo>
<mfrac>
<mrow>
<mo>&Pi;</mo>
<mi>u</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>+</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<mfrac>
<mi>N</mi>
<mn>2</mn>
</mfrac>
<mo>-</mo>
<mn>1</mn>
</mrow>
</mfrac>
</mrow>
</msup>
<mo>;</mo>
</mrow>
Wherein,The first foundation sequence X is frequency domain sequence.
17. transmitting terminal according to claim 13, it is characterised in that
Second generation unit, it is additionally operable to using the inverted order conjugate sequence of the first foundation sequence X as the described second basis
Sequence Y, the second basic sequence Y include：
<mrow>
<mi>y</mi>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mi>x</mi>
<msup>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>*</mo>
</msup>
<mrow>
<mo>(</mo>
<mfrac>
<mi>N</mi>
<mn>2</mn>
</mfrac>
<mo>-</mo>
<mn>1</mn>
<mo>-</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>.</mo>
</mrow>
18. a kind of receiving terminal, it is characterised in that the receiving terminal includes：
Sequence generating module, including：
Sequence setup unit for setting first foundation sequence as X, the second basic sequence is Y, the 3rd training sequence is S；
First generation unit, for generating the first foundation sequence X, the first foundation according to the symbol lengths of DMT systems
Sequence X is ZC sequences；
Second generation unit, for the first foundation sequence X generation described second generated according to first generation unit
Basic sequence Y, the second basic sequence Y are the inverted order conjugate sequences of first foundation sequence X；
3rd generation unit, for the first foundation sequence X generated according to first generation unit and second life
The second basic sequence Y into unit generation generates the 3rd training sequence S, and the 3rd training sequence S includes：
S=[0X0Y], the 3rd training sequence are used for sign synchronization and channel estimation simultaneously；
Signal receiving module, for receiving the signal to be sent of transmitting terminal transmission, it is provided with while uses in the signal to be sent
In the 4th training sequence of sign synchronization and channel estimation, the 3rd training sequence and the 4th training sequence have identical
Sequential structure；
Signal estimation module, for the reception signal received according to the signal receiving module and the sequence generating module
The 3rd training sequence of generation carries out sign synchronization and channel estimation.
19. receiving terminal according to claim 18, it is characterised in that the receiving terminal is used for discrete multitone DMT systems
In,
The self correlated peak of 3rd training sequence is higher than predetermined threshold, so as to according to the 3rd training sequence and the reception
The autocorrelation peak of the 4th training sequence in signal determines the original position of symbol in the reception signal；
Meanwhile
The frequency domain amplitude of 3rd training sequence is definite value, so that the 3rd training sequence meets wanting for channel estimation
Ask.
20. receiving terminal according to claim 19, it is characterised in that
The signal receiving module, it is additionally operable to receive the optical signal that transmitting terminal is sent, and will be converted to by the optical signal
Electric signal is as the reception signal.
21. receiving terminal according to claim 18, it is characterised in that first generation unit, including：
Length sets subelement, for setting the symbol lengths of the DMT systems as N；
First generation subelement, for generating the first foundation sequence X, the first foundation sequence X, including：
<mrow>
<mi>x</mi>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msup>
<mi>e</mi>
<mrow>
<mo>-</mo>
<mi>j</mi>
<mfrac>
<mrow>
<mo>&Pi;</mo>
<mi>u</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>+</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<mfrac>
<mi>N</mi>
<mn>2</mn>
</mfrac>
<mo>-</mo>
<mn>1</mn>
</mrow>
</mfrac>
</mrow>
</msup>
<mo>;</mo>
</mrow>
Wherein,The first foundation sequence X is frequency domain sequence.
22. receiving terminal according to claim 18, it is characterised in that
Second generation unit, it is additionally operable to using the inverted order conjugate sequence of the first foundation sequence X as the described second basis
Sequence Y, the second basic sequence Y include：
<mrow>
<mi>y</mi>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<mi>x</mi>
<msup>
<mrow>
<mo>(</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>*</mo>
</msup>
<mrow>
<mo>(</mo>
<mfrac>
<mi>N</mi>
<mn>2</mn>
</mfrac>
<mo>-</mo>
<mn>1</mn>
<mo>-</mo>
<mi>n</mi>
<mo>)</mo>
</mrow>
<mo>.</mo>
</mrow>
23. receiving terminal according to claim 22, it is characterised in that the signal estimation module, including：
Sequence converting unit, convert to obtain time-domain training sequence for the 3rd training sequence to be done into anti-Fourier IFFT；
First estimation unit, time domain and the time domain of sequence converting unit conversion for calculating the reception signal are instructed
It is related to practice the conjugation of sequence, so as to determine the original position of symbol in the reception signal according to correlation peak.
24. receiving terminal according to claim 22, it is characterised in that the signal estimation module, including：
Second estimation unit, for calculating the frequency domain of the reception signal and the ratio of the 3rd training sequence, so as to obtain
Channel estimation value.
25. a kind of system, it is characterised in that it includes the transmitting terminal and such as claim as described in claim 13 to 17 is any
18 to 24 any described receiving terminals.
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| CN107710669B (en) * | 2015-09-21 | 2020-06-02 | 华为技术有限公司 | Data transmission method, transceiving equipment and system |
| RU2732878C2 (en) * | 2016-02-01 | 2020-09-25 | Стар-Данди Лимитед | Multiband communication |
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| CN101924725A (en) * | 2009-06-17 | 2010-12-22 | 国民技术股份有限公司 | Frame synchronization method and device for OFDM system |
| CN102594745A (en) * | 2011-12-29 | 2012-07-18 | 东南大学 | Synchronization method for single carrier frequency domain equalization system and realization circuit thereof |
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| CN101924725A (en) * | 2009-06-17 | 2010-12-22 | 国民技术股份有限公司 | Frame synchronization method and device for OFDM system |
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