CN105577596B - Signal creating method, frequency deviation detection method and device - Google Patents
Signal creating method, frequency deviation detection method and device Download PDFInfo
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Abstract
The present invention provides a kind of signal creating method, frequency deviation detection method and devices, wherein signal creating method includes: to obtain the first pseudo-random PN sequence that shift register generates and the frequency domain orthogonal frequency division multiplex OFDM symbol that transmitter generates；By the first PN sequence addition corresponding with the frequency-domain OFDM symbol, frequency-domain OFDM data frame is obtained；Inverse fast Fourier transform IFFT is used to the frequency-domain OFDM data frame, obtains the body data portions of signal frame；By the body data portions of the frame head part of preset signal frame and the signal frame, signal frame is formed, generates signal；Wherein, the frame head part of the preset signal frame includes M preset PN sequences, and the M is the positive number greater than zero.Signal creating method, frequency deviation detection method and the device provided through the invention can quickly and accurately determine the frequency deviation of carrier wave, improve the stability of system when the frame length of OFDM is longer.
Description
Technical field
The present invention relates to network communication technology field more particularly to a kind of signal creating methods, frequency deviation detection method and dress
It sets.
Background technique
Orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, abbreviation OFDM) technology
Intersymbol interference caused by frequency selective fading (Inter Symbol Interference, abbreviation ISI) can have been fought,
Have many advantages, such as immune high transfer rate, radio frequency interference, spectral efficient and lower multipath distortion, is the pass of physical layer
Therefore one of key technology is widely used in high-rate wireless communication network, Chinese ground digital television broadcast standard uses
Be time-domain synchronization OFDM technology (Time Domain Synchronous Orthogonal Frequency
Division Multiplexing, abbreviation TDS-OFDM), it is different from traditional ofdm system, TDS-OFDM system using
Known pseudo-random sequence (Pseudo Noise sequence, abbreviation PN) replaces cyclic prefix, one in the system of TDS-OFDM
Kind frame head structure, as shown in Figure 1, the frame head structure of double PN sequences can play the role of protection interval, while can also complete
Domain Synchronous, frequency domain synchronization and channel estimation.
A kind of multicarrier transmission systems of TDS-OFDM system, multicarrier transmission systems are very sensitive to carrier frequency offset,
The frequency departure of carrier wave will cause the orthogonality of subcarrier simultaneously, lead to the interference between carrier wave and the decaying of amplitude.Work as system
In determined circumstances, the length of OFDM is longer, and subcarrier spacing is smaller, also bigger on the influence of the frequency deviation of carrier wave, so, it is quasi-
True carrier wave frequency deviation detection and compensation are extremely important to ofdm system.
The estimation of carrier wave frequency deviation is completed by the frame head of signal frame in existing system, can be divided into rough estimate, thin to estimate
Three parts are estimated with essence.Rough estimate carries out in the initial state, and the frequency deviation Δ f between transmitter and receiver at this time can be very
Greatly, rough estimate is normally set up certain frequency departure threshold value, just carried out when Δ f is compensated to threshold value or less thin estimation and
Rough estimate.Thin estimation is estimated by the PN preamble sequence of signal frame, and the offset estimation of integral multiple is carried out, thin to estimate
Process, as shown in Figure 2.Essence estimation is estimated by the frame head relevant peaks of adjacent signals frame, and the frequency of score times is carried out
Estimation partially, as shown in Figure 3.
Traditional frequency deviation is carefully estimated and essence estimation can carry out most estimation to data frame, and still, OFDM is believed
When the data frame part of number frame significantly increases, such as when the length of the data frame part of signal frame is 32768, carefully estimate
Span is very big between range and the range of essence estimation, leads to the inaccuracy of offset estimation.
Summary of the invention
For the defects in the prior art, the present invention provides a kind of signal creating method, frequency deviation detection method and device, energy
Enough when the frame length of OFDM is longer, quickly and accurately determines the frequency deviation of carrier wave, improve the stability of system.
In a first aspect, the present invention provides a kind of signal creating method, comprising:
Obtain the first pseudo-random PN sequence that shift register generates and the frequency domain orthogonal frequency division multiplexing that transmitter generates
OFDM symbol；
By the first PN sequence addition corresponding with the frequency-domain OFDM symbol, frequency-domain OFDM data frame is obtained；
Inverse fast Fourier transform IFFT is used to the frequency-domain OFDM data frame, obtains the body data portion of signal frame
Point；
By the body data portions of the frame head part of preset signal frame and the signal frame, signal frame is formed, generates letter
Number；
Wherein, the frame head part of the preset signal frame includes M preset PN sequences, and the M is just greater than zero
Number.
Further, the length of the first PN sequence is identical as the length of the frequency-domain OFDM symbol.
Further, described by the first PN sequence addition corresponding with the frequency-domain OFDM symbol, obtain frequency-domain OFDM
Data frame, further includes:
To the first N times of the PN Aftershock decay, the 2nd PN sequence is obtained；
By the 2nd PN sequence addition corresponding with the frequency-domain OFDM symbol, frequency-domain OFDM data frame is obtained；
Wherein, the N is natural number.
Second aspect, the present invention provide a kind of frequency deviation detection method, comprising:
Frame head part and the body data portions of signal frame are obtained, the frame head part of the signal frame is the 3rd PN sequence；
According to the 3rd PN sequence, channel impulse response is obtained；
By the body data portions divided by the channel impulse response, body data is obtained；
According to the body data and preset 4th PN sequence, the position of the peak value of the first relevant peaks is determined；
According to the position of the position of the peak value of first relevant peaks and the peak value of preset second relevant peaks, carrier wave is determined
Frequency deviation；
Wherein, the 3rd PN sequence includes K sub- PN sequences, and the K is the positive number greater than zero；
The signal frame is the signal frame obtained according to either signal generation method in preceding claims 1 to 3.
Further, the frame head part for obtaining signal frame and body data portions, comprising:
It receives signal frame and the initial position of frame head is obtained using the method for synchronization；
According to the initial position of the frame head, frame head part and the body data portions of the signal frame are determined.
Further, described according to the 3rd PN sequence, obtain channel impulse response, comprising:
Fast Fourier Transform (FFT) FFT is used to the 3rd PN sequence, obtains the frequency domain data of the 3rd PN sequence；
By the frequency domain data of the 3rd PN sequence divided by preset 5th PN sequence, the channel impulse response is obtained.
Further, it is described by the body data portions divided by the channel impulse response, obtain body data, packet
It includes:
FFT transform is used to the body data portions, obtains the frequency domain data of the body data portions；
Frame by the frequency domain data of the body data portions divided by the channel impulse response, after obtaining frequency domain equalization
Data.
Further, described according to the body data and preset 4th PN sequence, determine the peak value of the first relevant peaks
Position, comprising:
By after the frequency domain equalization body data and the preset 4th PN sequence use cross-correlation mode, determine institute
State the value of the first relevant peaks；
Or,
Body data after obtaining T frequency domain equalization, the body data after the T frequency domain equalization is added up, is obtained
The accumulated value of body data after obtaining the T frequency domain equalization；
The accumulated value of body data after the T frequency domain equalization and the preset 4th PN sequence are used into cross-correlation
Mode determines the position of the peak value of first relevant peaks；
Wherein, the T is the natural number more than or equal to 2.
Further, the peak value of the position and preset second relevant peaks of the peak value according to first relevant peaks
Position determines carrier wave frequency deviation, comprising:
The position of the peak value of first relevant peaks is subtracted to the position of the peak value of preset second relevant peaks, it is poor to obtain
Value；
According to the difference, the carrier wave frequency deviation is determined.
The third aspect, the present invention provide a kind of frequency deviation detection device, comprising:
Acquiring unit, for obtaining frame head part and the body data portions of signal frame, the frame head part of the signal frame
For the 3rd PN sequence；
Impulse response unit, for obtaining channel impulse response according to the 3rd PN sequence；
Body data unit, for the body data portions divided by the channel impulse response, to be obtained body data；
First relevant peaks unit, for determining the first relevant peaks according to the body data and preset 4th PN sequence
Peak value position；
Nonlinear Transformation in Frequency Offset Estimation unit, for according to the peak values of first relevant peaks position and preset second relevant peaks
Peak value position, determine carrier wave frequency deviation；
Wherein, the 3rd PN sequence includes K sub- PN sequences, and the K is the positive number greater than zero；
The signal frame is the signal frame obtained according to either signal generation method in preceding claims 1 to 3.
As shown from the above technical solution, a kind of signal creating method, frequency deviation detection method and the dress provided through the invention
It sets, wherein signal creating method includes: to obtain the first pseudo-random PN sequence that shift register generates and the frequency that transmitter generates
Domain orthogonal frequency division multiplex OFDM symbol；By the first PN sequence addition corresponding with the frequency-domain OFDM symbol, frequency domain is obtained
OFDM data frame；OFDM data frame includes PN sequence and frequency-domain OFDM symbol, and letter can be effectively reduced during communication
Interference of the road to signal, while signal receiving end can be made to carry out decoding to signal and obtain accurate information, to the frequency domain
OFDM data frame uses inverse fast Fourier transform IFFT, obtains the body data portions of signal frame；By preset signal frame
The body data portions of frame head part and the signal frame form signal frame, generate signal, the frame head of the preset signal frame
Part includes M preset PN sequences, and the M is the positive number greater than zero, and the transmission of signal, Neng Gouyou are carried out using this signal frame
Effect guarantees the accuracy of the transmission of signal.Signal creating method, frequency deviation detection method and the device provided through the invention, can
When the frame length of OFDM is longer, quickly and accurately determines the frequency deviation of carrier wave, improve the stability of system.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below to embodiment or existing
Attached drawing needed in technical description is briefly described, it should be apparent that, the accompanying drawings in the following description is only this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural representation of the TDS-OFDM signal frame of the existing double PN structure of one kind provided in an embodiment of the present invention
Figure；
Fig. 2 is under a kind of structure of the TDS-OFDM signal frame based on existing double PN structure provided in an embodiment of the present invention
The flow diagram carefully estimated；
Fig. 3 is under a kind of structure of the TDS-OFDM signal frame based on existing double PN structure provided in an embodiment of the present invention
Essence estimation relevant peaks schematic diagram；
Fig. 4 is a kind of structural schematic diagram of signal frame provided in an embodiment of the present invention；
Fig. 5 is a kind of flow diagram of signal creating method provided in an embodiment of the present invention；
Fig. 6 is a kind of flow diagram of frequency deviation detection method provided in an embodiment of the present invention；
Fig. 7 is a kind of structural schematic diagram of frequency deviation detection device provided in an embodiment of the present invention；
Fig. 8 is a kind of signal transmitting end equipment structural schematic diagram of signal transmission system provided in an embodiment of the present invention；
Fig. 9 is a kind of signal receiving end device structure schematic diagram of signal transmission system provided in an embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiment of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
There are two PN sequences, synchronous signal transmitter can also preset PN sequence for tool in signal frame, and receiving generator terminal also can be pre-
It is the first PN sequence, the 2nd PN sequence, the 3rd PN sequence to distinguish different PN sequence definitions, at this if PN sequence
In " first ", " second ", " third " only PN sequence is distinguished, not limit sequence successive sequence.
Fig. 4 is a kind of structural schematic diagram of signal frame provided in an embodiment of the present invention, and Fig. 5 is provided in an embodiment of the present invention
A kind of flow diagram of signal creating method, as shown in Figures 4 and 5, the signal creating method of the present embodiment is as described below.
101, the first pseudo-random PN sequence that shift register generates and the frequency domain orthogonal frequency division multiplexing that transmitter generates are obtained
Use OFDM symbol.
It should be understood that shift register is linear, while shift register generates the first PN sequence, wherein first
The length of PN sequence is the length of data portion in ofdm signal frame.
Transmitter generates OFDM symbol, and the OFDM symbol of generation is the symbol for frequency domain, the length of frequency-domain OFDM symbol with
The length of first PN sequence is identical isometric.
102, by the first PN sequence addition corresponding with the frequency-domain OFDM symbol, frequency-domain OFDM data frame is obtained.
It should be understood that the length of the first PN sequence is identical as the length of frequency-domain OFDM symbol isometric, therefore by the first PN sequence
Addition corresponding with frequency-domain OFDM symbol is arranged, frequency-domain OFDM data frame is obtained.
It will also be appreciated that the 2nd PN sequence is obtained, specially to the first PN sequence to the first N times of PN Aftershock decay
Divided by N, the 2nd PN sequence of acquisition, the 2nd PN sequence is the sequence after decaying.
By the addition corresponding with frequency-domain OFDM symbol of the 2nd PN sequence, frequency-domain OFDM data frame, the length of the 2nd PN sequence are obtained
It spends identical as the length of frequency-domain OFDM symbol, wherein N is natural number.
103, inverse fast Fourier transform IFFT is used to the frequency-domain OFDM data frame, obtains the body data of signal frame
Part.
It should be understood that when, inverse fast Fourier transform (Inverse is used to the frequency-domain OFDM data frame of acquisition
Fast Fourier Transform, abbreviation IFFT), obtain the body data portions of signal frame.
It is understood that body data portions include that the first PN sequence and frame symbol two parts form.
104, by the body data portions of the frame head part of preset signal frame and the signal frame, signal frame is formed, it is raw
At signal.
It should be understood that in transmitters with the frame head part of preset signals frame, by the frame head part of signal frame and letter
The body data portions of number frame form signal frame, the transmitting to signal.
Wherein, the frame head part of preset signal frame includes M preset PN sequences in transmitter, and the M is greater than zero
Positive number, the length of a PN sequence of frame head part be it is fixed, therefore, frame head is specifically as follows 1 PN sequence, 2 PN
Sequence, while can be 1.2 PN sequences or 1.5 PN sequences, here specific limit is not made to the length of frame head part
It is fixed.
The signal creating method provided through this embodiment can effectively transmit data, while in the receiving terminal of signal
Frequency deviation is effectively detected, so that signal effectively inhibits the interference of the noise in channel when transmission.
Fig. 6 is a kind of flow diagram of frequency deviation detection method provided in an embodiment of the present invention, as shown in fig. 6, this implementation
The frequency deviation detection method of example is as described below.
201, frame head part and the body data portions of signal frame are obtained, the frame head part of the signal frame is the 3rd PN sequence
Column.
For example, receiving end receives signal, obtains the signal frame in signal, by signal frame frame head part and frame
Volume data part is separated, wherein the frame head part of signal frame is the 3rd PN sequence, wherein the 3rd PN sequence includes K son
PN sequence, K are positive number greater than zero, the length of a PN sequence of frame head part be it is fixed, therefore, frame head is specifically as follows
1 PN sequence, 2 PN sequences, while can be 1.2 PN sequences or 1.5 PN sequences, here to the length of frame head part
Degree does not make specific restriction.
It is understood that receiver receives signal frame, using the method for synchronization, to obtain the initial position of frame head, simultaneously
The length of frame head is variable.
According to the initial position of the frame head, frame head part and the body data portions of the signal frame are determined, it is determined that
The initial position of frame head, while knowing the length of frame head, frame head part and body data portions can be separated, to obtain
Obtain the 3rd PN sequence.
202, according to the 3rd PN sequence, channel impulse response is obtained.
For example, to the 3rd PN sequence using Fast Fourier Transform (FFT) (Fast Fourier Transform, letter
Claim FFT), obtain the frequency domain data of the 3rd PN sequence.
By the frequency domain data of the 3rd PN sequence divided by the preset 5th PN sequence, obtains the channel impulse and ring
It answers.
Wherein, the 5th PN sequence is the preset PN sequence of receiver end, the length of the 5th PN sequence and the 3rd PN sequence
Length is identical.
203, the body data portions are obtained into body data divided by the channel impulse response.
For example, FFT transform is used to the body data portions, obtains the frequency domain number of the body data portions
According to；
Frame by the frequency domain data of the body data portions divided by the channel impulse response, after obtaining frequency domain equalization
Data.
The part of the data frame of receiver end received signal frame is made of frame symbol and PN sequence, wherein frame
The length of symbol is identical as the symbol lengths of PN sequence.
204, according to the body data and preset 4th PN sequence, the position of the peak value of the first relevant peaks is determined.
For example, by after the frequency domain equalization body data and the preset 4th PN sequence use cross-correlation side
Formula determines the value of first relevant peaks.
For example, obtain T frequency domain equalization after body data, by the body data after the T frequency domain equalization into
Row is cumulative, the accumulated value of the body data after obtaining the T frequency domain equalization, the body data after obtaining 2 frequency domain equalizations, and 5
Body data after a frequency domain equalization does not make restriction to the number specifically obtained here, to the data to a frequency domain of acquisition
It adds up, obtains accumulated value.
The accumulated value of body data after the T frequency domain equalization and preset 4th PN sequence are used into cross-correlation side
Formula determines the position of the peak value of first relevant peaks, wherein mutual mode is between two time serieses and at the same time
Degree of correlation of the sequence between the value of any two different moments.
Wherein, the T is the natural number more than or equal to 2.
205, it according to the position of the position of the peak value of first relevant peaks and the peak value of preset second relevant peaks, determines
Carrier wave frequency deviation.
For example, the position of the peak value of first relevant peaks is subtracted to the position of the peak value of preset second relevant peaks
It sets, obtains difference.
According to the difference, the carrier wave frequency deviation is determined.
The frequency deviation detection method provided through this embodiment, can effectively detect OFDM frame length it is longer when, it is quasi-
The frequency deviation for really quickly determining carrier wave, adjusts the frequency deviation difference of carrier wave, improves the stability of system.
Fig. 7 is a kind of structural schematic diagram of frequency deviation detection device provided in an embodiment of the present invention, as shown in fig. 7, this implementation
The frequency deviation detection device of example is as described below.
Frequency deviation detection device includes: acquiring unit 71, impulse response unit 72, body data unit 73, the first relevant peaks
Unit 74, Nonlinear Transformation in Frequency Offset Estimation unit 75.
Acquiring unit 71, for obtaining frame head part and the body data portions of signal frame, the frame head portion of the signal frame
It is divided into the 3rd PN sequence.
Impulse response unit 72, for obtaining channel impulse response according to the 3rd PN sequence.
Body data unit 73, for the body data portions divided by the channel impulse response, to be obtained frame number
According to.
First relevant peaks unit 74, for determining the first correlation according to the body data and preset 4th PN sequence
The position of the peak value at peak.
Carrier wave frequency deviation unit 75, for according to the position of the peak values of first relevant peaks and preset second relevant peaks
The position of peak value, determines carrier wave frequency deviation.
Wherein, the 3rd PN sequence includes K sub- PN sequences, and the K is the positive number greater than zero.
The frequency deviation detection device provided through this embodiment, can effectively detect OFDM frame length it is longer when, it is quasi-
The frequency deviation for really quickly determining carrier wave, adjusts the frequency deviation difference of carrier wave, improves the stability of system.
A kind of signal transmission system is additionally provided in the present embodiment, comprising: signal transmitting end equipment and signal receiving end are set
It is standby.Signal transmitting end equipment generates signal frame according to the signal frame generating method of above-described embodiment and emits；Signal receiving end is set
It is standby to receive signal frame, and source information is therefrom demodulated, while completing integer frequency offset estimation using embedded pseudo-random sequence.Fig. 8
For a kind of signal transmitting end equipment structural schematic diagram of signal transmission system provided in an embodiment of the present invention, as shown in figure 8, this reality
The signal transmitting end equipment for applying the signal transmission system of example is as described below.
Signal transmitting end equipment includes: PN Sequencer block 801, frequency-domain OFDM data generation module 802, data phase
Add module 803, IFFT module 804, frame head PN generator 805 and signal frame generation module 806.PN Sequencer block 801
It is separately connected data summation module 803 with frequency-domain OFDM data generation module 802, data summation module 803 connects IFFT module
805 connection signal frame generation module 806 of 804, IFFT modules 804 and frame head PN generator.
PN Sequencer block 801 generates the equal long pseudo-random sequences in insertion frequency-domain OFDM data, length by
OFDM mode determines.The PN sequence that the module generates is exported to data summation module 803.
Frequency-domain OFDM data generation module 802 generates frequency-domain OFDM symbol using source message, and length is determined by OFDM mode
It is fixed.The frequency-domain OFDM data that the module generates are exported to data summation module 803.
Data summation module 803 is added corresponding with frequency-domain OFDM symbol after PN sequence amplitude fading, obtains insertion PN sequence
The frequency-domain OFDM data of column.
The frequency-domain OFDM data of 804 pairs of IFFT module insertion PN sequences carry out inverse FFT transform, obtain time domain OFDM data,
Form the frame of signal frame.
Frame head PN generator 805 generates two identical PN sequences, and length is determined by protection interval length, two PN sequences
Double PN frame heads of column composition signal frame.
Double PN frame heads and OFDM frame are spliced into complete signal frame by signal frame generation module 806, are then formed
Transmission signal is obtained after the processing such as filtering, quadrature up-conversion to be emitted.
For the equipment of signal transmitting terminal for generating signal, the signal frame in signal includes body data portions and frame head portion
Point, body data portions are frame symbol and PN Sequence composition, can effectively ensure that signal during transmission, reduce frequency
Deviation obtains the performance of good system.
Fig. 9 is a kind of signal receiving end device structure schematic diagram of signal transmission system provided in an embodiment of the present invention, such as
Shown in Fig. 9, the signal receiving end equipment of the signal transmission system of the present embodiment is as described below.
Signal receiving end equipment includes: frame head frame separation module 901, channel estimation module 902, channel equalization module
903, frequency deviation estimating modules 904 and data demodulation module 905.Frame head frame separation module 901 is separately connected channel estimation module
902 and channel equalization module 903, channel equalization module 903 connects frequency deviation estimating modules 904,904 connection number of frequency deviation estimating modules
According to demodulation module 905.
Frame head frame separation module 901 receives the signal frame of signal transmitting terminal transmission and synchronizes, and then separates double PN
Double PN frame heads are exported to channel estimation module 902, frame are exported to channel equalization module 903 by frame head and frame.
Channel estimation module 902 is using second PN sequence in frame head, after being carried out FFT transform, divided by local
PN sequence obtains receiving end to the estimation H of channel impulse response, and outputs it to channel equalization module 903.
Body data is first carried out FFT transform by channel equalization module 903, obtains frequency-domain OFDM data, then by its divided by
The channel impulse response H that channel estimation module 902 is estimated, the OFDM data after obtaining frequency domain equalization, and output it to frequency deviation
Estimation module 904.
Frequency deviation estimating modules 904 carry out score times Nonlinear Transformation in Frequency Offset Estimation and integral multiple carrier deviation estimation respectively, wherein whole
The method of several times Nonlinear Transformation in Frequency Offset Estimation is as previously described.The estimated result of carrier wave frequency deviation will be used to receive to obtain signal frame body carry out
Compensation, result are exported to data demodulation module 905.
Data demodulation module 905 demodulates compensated body data, therefrom recovers the source information of transmitting terminal.
The signal transmission system provided through this embodiment can generate the signal frame of target, while effective in receiving end
Detection OFDM when frame length is longer, quickly and accurately determine carrier wave frequency deviation, improve the stability of system.
Those of ordinary skill in the art will appreciate that: realize that all or part of step of above method embodiment can lead to
The relevant hardware of program instruction is crossed to complete, program above-mentioned can store in computer-readable storage medium, the journey
Sequence when being executed, executes step including the steps of the foregoing method embodiments；And storage medium above-mentioned include: ROM, RAM, magnetic disk or
In the various media that can store program code such as CD.
The above description is merely a specific embodiment, and still, protection scope of the present invention is not limited to this, appoints
What those familiar with the art in the technical scope disclosed by the present invention, the variation or substitution that can be readily occurred in, all
It is covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the scope of protection of the claims
Subject to.
Claims (9)
1. a kind of signal creating method characterized by comprising
Obtain the first pseudo-random PN sequence that shift register generates and the frequency domain orthogonal frequency division multiplex OFDM symbol that transmitter generates
Number；
By the first PN sequence addition corresponding with the frequency-domain OFDM symbol, frequency-domain OFDM data frame is obtained；
Inverse fast Fourier transform IFFT is used to the frequency-domain OFDM data frame, obtains the body data portions of signal frame；
By the body data portions of the frame head part of preset signal frame and the signal frame, signal frame is formed, generates signal；
Wherein, the length of the first PN sequence is identical as the length of the frequency-domain OFDM symbol, the preset signal frame
Frame head part includes M preset PN sequences, and the M is the positive number greater than zero.
2. signal creating method according to claim 1, which is characterized in that described by the first PN sequence and the frequency
Domain OFDM symbol is corresponding to be added, and frequency-domain OFDM data frame is obtained, further includes:
To the first N times of the PN Aftershock decay, the 2nd PN sequence is obtained；
By the 2nd PN sequence addition corresponding with the frequency-domain OFDM symbol, frequency-domain OFDM data frame is obtained；
Wherein, the N is natural number.
3. a kind of frequency deviation detection method characterized by comprising
Frame head part and the body data portions of signal frame are obtained, the frame head part of the signal frame is the 3rd PN sequence；
According to the 3rd PN sequence, channel impulse response is obtained；
By the body data portions divided by the channel impulse response, body data is obtained；
According to the body data and preset 4th PN sequence, the position of the peak value of the first relevant peaks is determined；
According to the position of the position of the peak value of first relevant peaks and the peak value of preset second relevant peaks, carrier frequency is determined
Partially；
Wherein, the 3rd PN sequence includes K sub- PN sequences, and the K is the positive number greater than zero；
The signal frame is the signal frame obtained according to either signal generation method in preceding claims 1 to 2.
4. frequency deviation detection method according to claim 3, which is characterized in that the frame head part for obtaining signal frame and frame
Volume data part, comprising:
It receives signal frame and the initial position of frame head is obtained using the method for synchronization；
According to the initial position of the frame head, frame head part and the body data portions of the signal frame are determined.
5. frequency deviation detection method according to claim 3, which is characterized in that it is described according to the 3rd PN sequence, it obtains
Channel impulse response, comprising:
Fast Fourier Transform (FFT) FFT is used to the 3rd PN sequence, obtains the frequency domain data of the 3rd PN sequence；
By the frequency domain data of the 3rd PN sequence divided by preset 5th PN sequence, the channel impulse response is obtained.
6. frequency deviation detection method according to claim 3, which is characterized in that it is described by the body data portions divided by institute
Channel impulse response is stated, body data is obtained, comprising:
FFT transform is used to the body data portions, obtains the frequency domain data of the body data portions；
Frame number by the frequency domain data of the body data portions divided by the channel impulse response, after obtaining frequency domain equalization
According to.
7. the frequency deviation detection method according to claim 3 or 6, which is characterized in that described according to the body data and pre-
If the 4th PN sequence, determine the position of the peak value of the first relevant peaks, comprising:
By after the frequency domain equalization body data and the preset 4th PN sequence use cross-correlation mode, determine described the
The value of one relevant peaks；
Or,
Body data after obtaining T frequency domain equalization, the body data after the T frequency domain equalization is added up, and obtains institute
The accumulated value of body data after stating T frequency domain equalization；
The accumulated value of body data after the T frequency domain equalization and the preset 4th PN sequence are used into cross-correlation side
Formula determines the position of the peak value of first relevant peaks；
Wherein, the T is the natural number more than or equal to 2.
8. frequency deviation detection method according to claim 3, which is characterized in that the peak value according to first relevant peaks
Position and preset second relevant peaks peak value position, determine carrier wave frequency deviation, comprising:
The position of the peak value of first relevant peaks is subtracted to the position of the peak value of preset second relevant peaks, obtains difference；
According to the difference, the carrier wave frequency deviation is determined.
9. a kind of frequency deviation detection device characterized by comprising
Acquiring unit, for obtaining frame head part and the body data portions of signal frame, the frame head part of the signal frame is the
Three PN sequences；
Impulse response unit, for obtaining channel impulse response according to the 3rd PN sequence；
Body data unit, for the body data portions divided by the channel impulse response, to be obtained body data；
First relevant peaks unit, for determining the peak of the first relevant peaks according to the body data and preset 4th PN sequence
The position of value；
Nonlinear Transformation in Frequency Offset Estimation unit, for according to the position of the peak values of first relevant peaks and the peak of preset second relevant peaks
The position of value, determines carrier wave frequency deviation；
Wherein, the 3rd PN sequence includes K sub- PN sequences, and the K is the positive number greater than zero；
The signal frame is the signal frame obtained according to either signal generation method in preceding claims 1 to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410535074.5A CN105577596B (en) | 2014-10-11 | 2014-10-11 | Signal creating method, frequency deviation detection method and device |
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| "A Novel Scheme of Joint Channel and Phase Noise Compensation for Chinese DTMB System";Shuai Zhang and Xiaolin Zhang，;《IEEE TRANSACTIONS ON BROADCASTING》;20101210;129-134 |
| "A Simplified Equalization Method for Dual PN-Sequence Padding TDS-OFDM Systems";Jian Fu,etc al.,;《IEEE TRANSACTIONS ON BROADCASTIND》;20081208;第54卷(第4期);825-830 |
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