CN105356918B - Offset Quadrature Amplitude modulated filter group multi-carrier signal detection method and device - Google Patents
Offset Quadrature Amplitude modulated filter group multi-carrier signal detection method and device Download PDFInfo
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- CN105356918B CN105356918B CN201510758264.8A CN201510758264A CN105356918B CN 105356918 B CN105356918 B CN 105356918B CN 201510758264 A CN201510758264 A CN 201510758264A CN 105356918 B CN105356918 B CN 105356918B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/362—Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
Abstract
The embodiment of the invention discloses a kind of Offset Quadrature Amplitude modulated filter group multi-carrier signal detection method and device, applied to data receiver, the first signal in the data receiver interception baseband signal, first signal is filtered, obtains secondary signal；The secondary signal is averagely decomposed into respective numbers N point signals, Fast Fourier Transform (FFT) is carried out to each N points signal, obtains the N point signals after respective numbers conversion；By the N point signals after each conversion according to mode is corresponding goes the mode of disturbing disturb with transmitting terminal scrambling, obtain respective numbers and go to disturb N point signals；The respective numbers are gone to disturb N point signals and are overlapped, OQAM demodulation is carried out afterwards, obtains the real part or imaginary part of signal.Due in the embodiment of the present invention to the N point signals after each conversion according to mode is corresponding goes the mode of disturbing to carry out going to disturb with transmitting terminal scrambling, receiving terminal is recovered the real part or imaginary part of original signal.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of Offset Quadrature Amplitude modulated filter group multi-carrier signal detection
Method and device.
Background technology
Filter bank multi-carrier technology (FBMC) has stronger anti-multipath jamming compared to traditional multi-transceiver technology
Ability, can preferably handle the complex contradiction between the balanced reception technology of high-rate wireless communication and complexity, be following new
One of core technology of generation system of broadband wireless communication.As one kind of FBMC system implementations, Offset Quadrature Amplitude tune
Filter bank multi-carrier technology (FBMC-OQAM) processed has converged a variety of advantages of FBMC technologies.The technology employs multicarrier orthogonal
Condition, ensure that can completely reduce received input signal and from intersymbol interference and carrier wave in data receiver
Between the influence disturbed.
Existing FBMC-OQAM technologies are as shown in Figure 1, the real and imaginary parts alternating input data of each original signal is sent
End, the data sending terminal are directed to the signal currently inputted, carry out Offset Quadrature Amplitude modulation (OQAM), quick Fu to it successively
In leaf inverse transformation (IFFT), ptototype filter filtering and Signal averaging, export baseband signal；Data receiver is believed from the base band
Pending signal is synchronously obtained in number, the pending signal is carried out the ptototype filter identical with the data sending terminal filters
Ripple, then the M signal of acquisition is carried out to Fast Fourier Transform (FFT) (FFT) and OQAM demodulation successively, final alternately output recovers letter
Number real part either imaginary part using it is described recovery signal real part or imaginary part as correspondence original signal real part or imaginary part.
In existing FBMC-OQAM technologies, the intermediate data often produced to data sending terminal is multiplied by one group of suitable phase
Interference factor, that is, add artificial scrambler, to handle sending signal, and then certain treatment effect, such as reduce hair
Peak-to-average power ratio (PAPR) for the number of delivering letters etc..As shown in Fig. 2, data sending terminal will can multiply by the modulated M signals of OQAM
With the default phase interference factor, that is, add artificial scrambler；But existing FBMC-OQAM technologies are still pressed in data receiver
Handled according to original mode, alternately output and the real part or void of recovery signal similar in the original signal real part either imaginary part
Portion, but had differences between the real part of signal that recovers of this method or imaginary part and original signal, therefore recover
Obtained original signal is inaccurate.
The content of the invention
The embodiment of the invention discloses a kind of Offset Quadrature Amplitude modulated filter group multi-carrier signal detection method and dress
Put, can recover to obtain accurate original signal.
To reach above-mentioned purpose, the embodiment of the invention discloses a kind of Offset Quadrature Amplitude modulated filter group multicarrier letter
Number detection method, applied to data receiver, the method includes the steps：
According to default interception rule, it is one group of data point of kN as the first signal to intercept points in baseband signal, its
Middle N is transmitting terminal number of subcarriers, and k is the overlap factor that transmitting terminal carries out M signal periodic extension；
First signal is filtered according to filtering mode corresponding with transmitting terminal, obtains secondary signal；
The secondary signal is averagely cut into respective numbers N point signal segments in time domain, to each N points signal
Duan Jinhang Fast Fourier Transform (FFT)s, obtain the N point signals after respective numbers conversion；
By the N point signals after each conversion according to mode is corresponding goes the mode of disturbing disturb with transmitting terminal scrambling,
Respective numbers are obtained to go to disturb N point signals；
The data point that the respective numbers go to disturb the correspondence position in N point signals is added, a N point is obtained and treats
Determine signal；
Corresponding demodulation mode is modulated using Offset Quadrature Amplitude to be demodulated the signal to be determined, after obtaining demodulation
The real part or imaginary part of signal.
Preferably, being filtered first signal according to filtering mode corresponding with transmitting terminal described, is obtained
Respective numbers N point signal segments are averagely cut into after binary signal, by the secondary signal in time domain, to each N points
Signal segment carries out Fast Fourier Transform (FFT), and before obtaining the N point signals after respective numbers conversion, the method further includes：
The signal segment of preset length is intercepted as secondary signal from the center section of current secondary signal.
Preferably, the N point signals by after each conversion with transmitting terminal according to scrambling, mode is corresponding to go to the side of disturbing
Formula disturb, and obtains respective numbers and goes to disturb N point signals, including：
According to the division rule identical with transmitting terminal, by the N point signals after each conversion, if being divided into time domain
Dry subsignal；
For each subsignal, it is multiplied by respectively and the corresponding identical interference factor vector of transmitting terminal.
Preferably, described solve the signal to be determined using the corresponding demodulation mode of Offset Quadrature Amplitude modulation
Adjust, the real part or imaginary part of signal after being demodulated, including：
At the time of sending real and imaginary parts in each signal according to data sending terminal, and preserve receive each real part and
At the time of imaginary part, judge presently described first signal for corresponding real part or imaginary part；
If corresponding real part, the real part using the signal to be determined as signal；
It is if corresponding imaginary part, the imaginary part after the signal delay T/2 to be determined as signal, wherein T is former for transmitting terminal
The time domain length of beginning signal.
Preferably, the method further includes：
It is echo signal that the real part of the signal is combined output with the imaginary part of the signal.
, should the embodiment of the invention also discloses a kind of Offset Quadrature Amplitude modulated filter group multi-carrier signal detection device
For data receiver, described device includes：
Baseband signal interception module, for according to default interception rule, it to be one group of kN to intercept points in baseband signal
For data point as the first signal, wherein N is transmitting terminal number of subcarriers, and k is that transmitting terminal carries out periodic extension to original signal
Overlap factor；
Filter module, for first signal to be filtered according to filtering mode corresponding with transmitting terminal, obtains
Binary signal；
Fast Fourier transform module, for the secondary signal to be averagely cut into respective numbers N points in time domain
Signal segment, carries out Fast Fourier Transform (FFT) to each N points signal segment, obtains the N point signals after respective numbers conversion；
Go to disturb module, for by the N point signals after each conversion, according to scrambling with transmitting terminal, mode is corresponding to go to disturb
Mode disturb, and obtains respective numbers and goes to disturb N point signals；
Laminating module, the data point for going to disturb the correspondence position in N point signals by the respective numbers are added,
Obtain a N points signal to be determined；
Demodulation module, solves the signal to be determined for modulating corresponding demodulation mode using Offset Quadrature Amplitude
Adjust, the real part or imaginary part of signal after being demodulated.
Preferably, described device further includes：
Data cutout module, for the signal segment from the center section of current secondary signal interception preset length as second
Signal.
Preferably, described go to disturb module, including：
Submodule is divided, for according to the division rule identical with transmitting terminal, by the N point signals after each conversion,
Several subsignals are divided into time domain；
Go to disturb submodule, for for each subsignal, being multiplied by respectively and the corresponding identical interference factor of transmitting terminal
Vector.
Preferably, the demodulation module, including：
Judging submodule, at the time of for sending real and imaginary parts in each signal according to data sending terminal, and preserve
At the time of receiving each real and imaginary parts, judge presently described first signal for corresponding real part or imaginary part；
Real imaginary part determination sub-module, if judging that presently described first signal corresponds to real part for the judging submodule,
Real part using the signal to be determined as signal；If the judging submodule judges that presently described first signal corresponds to imaginary part,
Then using the imaginary part after the signal delay T/2 to be determined as signal, wherein T is the time domain length of transmitting terminal original signal.
Preferably, described device further includes：
Composite module, is echo signal for the real part of the signal to be combined to output with the imaginary part of the signal.
As seen from the above technical solutions, an embodiment of the present invention provides a kind of Offset Quadrature Amplitude modulated filter group is more
Carrier signal detection method and device, applied to data receiver, the data receiver is according to default interception rule, interception
One group of data point that points are kN in baseband signal is transmitting terminal number of subcarriers as the first signal, wherein N, and k is transmitting terminal
The overlap factor of periodic extension is carried out to original signal；First signal is carried out according to filtering mode corresponding with transmitting terminal
Filtering, obtains secondary signal；The secondary signal is averagely cut into respective numbers N point signal segments in time domain, to each
The N points signal segment carries out Fast Fourier Transform (FFT), obtains the N point signals after respective numbers conversion；Will each conversion
N point signals afterwards obtain respective numbers and go to disturb N points letter according to mode is corresponding goes the mode of disturbing disturb with transmitting terminal scrambling
Number；The data point that the respective numbers go to disturb the correspondence position in N point signals is added, it is to be determined to obtain a N point
Signal；Corresponding demodulation mode is modulated using Offset Quadrature Amplitude to be demodulated the signal to be determined, is believed after being demodulated
Number real part or imaginary part.Due to being scrambled in the embodiment of the present invention to the N point signals after each conversion according to transmitting terminal
Mode is corresponding to go the mode of disturbing to carry out going to disturb, can remove the real part of signal for recovering to obtain or imaginary part and original signal it
Between difference, and then recover obtain accurate original signal.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is existing FBMC-OQAM techniqueflows schematic diagram；
Fig. 2 is the existing FBMC-OQAM techniqueflows schematic diagram for adding the phase interference factor；
Fig. 3 is a kind of Offset Quadrature Amplitude modulated filter group multi-carrier signal detection side that the embodiment of the present invention one provides
The flow diagram of method；
Fig. 4 carries out M signal for data sending terminal provided in an embodiment of the present invention periodic extension and utilizes prototype filter
The schematic diagram being filtered；
Fig. 5 is the schematic diagram provided in an embodiment of the present invention that Scrambling Operation is carried out to signal after modulation；
Fig. 6 is the schematic diagram provided in an embodiment of the present invention that segmentation Scrambling Operation is carried out to signal after modulation；
Fig. 7 is a kind of FBMC-OQAM signal detection systems block diagram provided in an embodiment of the present invention；
Fig. 8 is a kind of Offset Quadrature Amplitude modulated filter group multi-carrier signal detection dress that the embodiment of the present invention one provides
The structure diagram put.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment, belongs to the scope of protection of the invention.
Below by specific embodiment, the present invention is described in detail.
Fig. 3 is a kind of Offset Quadrature Amplitude modulated filter group multi-carrier signal detection side that the embodiment of the present invention one provides
The flow diagram of method, the method are applied to data receiver, and this method can include step：
S301：According to default interception rule, one group of data point that points are kN in interception baseband signal is as the first letter
Number.
Wherein N is transmitting terminal number of subcarriers, and k is the overlap factor that transmitting terminal carries out M signal periodic extension.
In the transmitting terminal of the prior art, it is necessary to which M signal to be filtered is carried out before signal is carried out ptototype filter filtering
Periodic extension, is the length identical with the ptototype filter by the length continuation of the M signal, as shown in figure 4, in described
Between the length of signal be N, the M signal is subjected to periodic extension according to integer k, obtains the overall signal that length is kN, then
The overall signal is filtered using ptototype filter.In embodiments of the present invention, it is assumed that transmitting terminal received signal is
Length is the signal of N, then N is also transmitting terminal number of subcarriers at the same time, and the length of the M signal to be filtered is also N；Cause
For in embodiments of the present invention, the length of the ptototype filter is the integral multiple of the length of the M signal, so at this
In inventive embodiments, the integer can be determined as to carrying out M signal the overlap factor k of periodic extension.It is described to believe from base band
According to preset rules in number, it is one group of data point of kN as the first signal to intercept points in baseband signal, in order into
When the follow-up ptototype filter of row filters, make first signal that there is identical length with the ptototype filter.
To data sending terminal number of subcarriers N determine, to transmitting terminal to M signal carry out periodic extension it is overlapping because
Sub- k determine and the prior art is determined as to first signal, the present invention repeats no more.
S302：First signal is filtered according to filtering mode corresponding with transmitting terminal, obtains secondary signal.
In embodiments of the present invention, data receiver has the ptototype filter group identical with data sending terminal, for pair
The first signal that the data receiver receives is filtered, if the length of first signal is kN, by step
The length for the secondary signal that S302 is obtained also is kN.
The filtering is the prior art, and the present invention repeats no more.
S303：The secondary signal is averagely cut into respective numbers N point signal segments in time domain, to each N
Point signal segment carries out Fast Fourier Transform (FFT), obtains the N point signals after respective numbers conversion.
Process described in step S303 is the prior art, and the present invention repeats no more.
S304：By the N point signals after each conversion, according to being scrambled with transmitting terminal, mode is corresponding to go the mode of disturbing to carry out
Go to disturb, obtain respective numbers and go to disturb N point signals.
In data sending terminal, after carrying out signal to carry out OQAM modulation, signal after obtained modulation can be added
Disturb processing, the data receiver using with the data sending terminal mode that to carry out scrambling processing identical, to data receiver
In signal carry out disturbing processing.
In embodiments of the present invention, signal after the modulation can be multiplied by one group of interference factor vector, as to described
The scrambling processing of signal after modulation, as shown in figure 5, each data point after modulation in signal is multiplied by the interference factor vector
In corresponding element, be changed equivalent to the energy to data point in signal after the modulation, the purpose so done, be in order to
Overcome the inherent shortcoming of multi-carrier modulation, such as reduce the peak-to-average power ratio (PAPR) that data sending terminal sends signal.Described
In step S304, mode is corresponding goes the mode of disturbing for the scrambling with transmitting terminal, and N point signals that will be each after the conversion are multiplied by
Signal multiplies identical interference factor vector after modulation corresponding with data sending terminal, obtains the respective numbers and goes to disturb N points
Signal, wherein, the N point signals after the conversion and data sending terminal interference factor vector can be preserved in the data receiver
Mapping table, so as to determine that the N points signal after the conversion of presently described respective numbers should by searching for the mode of table
It is vectorial when being multiplied by which interference factor.
S305：The data point that the respective numbers go to disturb the correspondence position in N point signals is added, obtains one
N points signal to be determined.
Will the respective numbers go to disturb N point signals and be overlapped, using the signal after superposition as signal to be determined.
S306：Corresponding demodulation mode is modulated using Offset Quadrature Amplitude to be demodulated the signal to be determined, is obtained
The real part or imaginary part of signal after demodulation.
Since the baseband signal that in practical operation, the data receiver receives is by multiple and different filtered signals
Formed by time domain superposition, and the filtered signal be by signal after scrambling via Fast Fourier Transform Inverse,
And then also maintain the transition state and overlaying state of interference factor in baseband signal, so data receiver is needed successively to institute
Secondary signal is stated to be split and Fast Fourier Transform (FFT), i.e., accordingly remove in institute's secondary signal the overlaying state of interference factor and
Transition state, and then corresponding with by way of transmitting terminal scrambling the mode of disturbing can be gone to remove the interference factor in signal.
The Offset Quadrature Amplitude modulates the inverse operation that corresponding demodulation mode is Offset Quadrature Amplitude modulation, when this
When the data receiver judges that current signal to be determined corresponds to the real part of original signal, then directly the data of the input are made
For the real part of signal；When the module judges that current signal to be determined corresponds to the imaginary part of original signal, then by the number of the input
According to real parts of the delay T/2 as the signal, wherein T is the time domain cycle in the original signal of data sending terminal input.Wherein,
Judge that current signal to be determined corresponds to the method for the real part of original signal or the method for imaginary part as the prior art, the present invention is not
Repeat again.
The embodiment of the present invention adds for one group of phase interference factor is being multiplied by the intermediate data that data sending terminal produces
In the case of entering artificial scrambler, caused by data receiver the problem of can not recovering the real part or imaginary part of original signal,
Corresponding M signal according to mode is corresponding goes the mode of disturbing disturb with transmitting terminal scrambling, then is carried out it by data receiver
Operation afterwards, enables receiving terminal to recover the real part or imaginary part of original signal.
In another embodiment provided by the invention, the progress of partial data point can be intercepted out from the secondary signal
Subsequent process, to reduce the operand of subsequent treatment.Based on the method described in the embodiment of the present invention one, the step S302 it
Afterwards, before the step S303, method shown in Fig. 3 can also include：
The signal segment of preset length is intercepted as secondary signal from the center section of current secondary signal.
The principle of the signal segment from the center section of current secondary signal interception preset length, to make the default length
The secondary signal that the signal segment of degree is formed still preserves the main energetic in original secondary signal.In practical applications, institute
The integral number power that k values are 2 is stated, and usually k values are more than or equal to 22 numerical value for 4,8,16 etc., at this moment, current the can be rejected
The kN/4 point on binary signal head and kN/4 data point of afterbody, retain kN/2 point of center section as secondary signal,
The length for intercepting current secondary signal center section is the signal segment of kN/2 as secondary signal.
In embodiments of the present invention, the data receiver intercepts preset length from the center section of current secondary signal
Signal segment reduces the data points of the secondary signal, and then reduce the operand of subsequent treatment as secondary signal.
In the data sending terminal of the embodiment of the present invention, signal after obtained modulation is subjected to scrambling processing, is generally included
Step：
According to default division rule, signal after the modulation is divided into several blocks；
Each described block is set to be multiplied by interference factor vector corresponding with the block.
The above-mentioned scrambling mode of the data sending terminal is as shown in fig. 6, signal A (n) is according to default division after modulating
Rule, be divided into time domain A1 (n), A2 (n) ..., Ax (n) this x block, the corresponding interference factor vector 1, dry of being multiplied by
Disturb because subvector 2 ..., interference factor vector x this x interference factor vector, obtain signal A ' (n) after total scrambling.Accordingly
, the above-mentioned scrambling mode of the corresponding data sending terminal, based on the method described in the embodiment of the present invention one, the step S304
It can include：
According to the division rule identical with transmitting terminal, by the N point signals after each conversion, if being divided into time domain
Dry subsignal；
For each subsignal, it is multiplied by respectively and the corresponding identical interference factor vector of transmitting terminal.
Wherein, can be determined by default corresponding block judgment technology described in current data reception end per height
Signal corresponds to which block in data sending terminal, and then it is dry to determine which presently described each subsignal should be multiplied by
Disturb because of subvector.The default corresponding block judgment technology is the prior art, and the present invention repeats no more.
In embodiments of the present invention, will believe for the data sending terminal according to default division rule after the modulation
Number several blocks are divided into, each described block is multiplied by the scrambling of interference factor vector corresponding with the block
Mode, the data receiver correspondingly by the N point signals after each conversion, are divided into some height letters in time domain
Number, for each subsignal, be multiplied by respectively with the corresponding identical interference factor vector of transmitting terminal, make described to go the method for disturbing more
Add flexible practicality.
In another embodiment provided by the invention, it can first judge that current signal to be determined corresponds to original signal
Real part or imaginary part, handle the signal to be determined according to judging result, are determined as the real part or void of signal
Portion.Based on the method described in the embodiment of the present invention one, the step S306 can include：
At the time of sending real and imaginary parts in each signal according to data sending terminal, and preserve receive each real part and
At the time of imaginary part, judge presently described first signal for corresponding real part or imaginary part；
The data sending terminal can be pre-saved in the data receiver send real and imaginary parts in each signal
Moment, and mapping table at the time of receive each real and imaginary parts, determined according to the mapping table presently described
First signal is corresponding real part or imaginary part.It is known at 0 moment as described in the signal that sends of data sending terminal, can be at 5 moment
First signal is received and converted to by the data receiver, if then it was determined that data sending terminal described in 0 moment is sent
Reality (void) portion for signal, then first signal of data receiver described in 5 moment is corresponding reality (void) portion.
Judge that presently described first signal for the method for corresponding real part or imaginary part is that the embodiment of the present invention carries above
A kind of method supplied, in practical applications, also other methods are available.Judge presently described first signal for corresponding reality
The method of portion or imaginary part is the prior art, and the present invention repeats no more.
If corresponding real part, the real part using the signal to be determined as signal；
It is if corresponding imaginary part, the imaginary part after the signal delay T/2 to be determined as signal, wherein T is former for transmitting terminal
The time domain length of beginning signal.
In embodiments of the present invention, the data receiver is according to judging that first signal corresponds to the side of real part or imaginary part
Method, judges that first signal corresponds to real part or imaginary part, according to the judging result, the signal to be determined is judged or
Operate in next step.
In another embodiment provided by the invention, the real and imaginary parts of fixed signal can be combined into
Echo signal is exported.Based on the method described in the embodiment of the present invention one, the method can also include：
It is echo signal that the real part of the signal is combined output with the imaginary part of the signal.
It is existing skill that the real part by the signal, which combines the method that output is echo signal with the imaginary part of the signal,
Art, the present invention repeat no more.
A kind of FBMC-OQAM signal detection systems block diagram provided in an embodiment of the present invention is illustrated in figure 7, shown in the block diagram
Method be：
Data sending terminal calculates the ptototype filter function h (n) identical with data sending terminal, also, the prototype filters
The length of device is the number of L=kN, wherein N data sending terminals subcarrier, and k is that transmitting terminal carries out periodic extension to M signal
Overlap factor.
OrderAnd n is integer,The number being used to store after FFT calculation process
According to.L=0 represents system since the l=0 moment.
One group of L point data is taken in baseband signal r (n) as the first signal, then by first signal according to hair
The corresponding filtering mode of sending end is filtered, that is, is multiplied by filter function h (n-lN/2), will first letter
Corresponding ptototype filter in time domain is filtered with it for number process, obtains secondary signalHaveAnd n is integer, wherein, l=0,1,2..., l take different value to represent current place
What is managed is the first signal at different moments.
Data cutout is carried out to the secondary signal.Because the time domain of ptototype filter function h (n) and the waveform of frequency domain are all
With good time-frequency focusing, by the power spectrumanalysis to ptototype filter, it is found that energy is concentrated mainly on h (n), n ∈
[T, kT-T] and n are the part of integer, k=4 in the present embodiment, you can with reject the top n point in the secondary signal and
N number of point afterwards, only retains 2N point of center section.So interception2N point of center section, as secondary signal
Wherein T is the time domain length of transmitting terminal original signal.
To the secondary signal being truncated in previous stepIts top n data is first taken to carry out the FFT computings of N points, computing
Result be stored inIn, namelyIt is right againCarry out artificial scrambler
Processing for removing, willBe multiplied by corresponding with transmitting terminal phase factor vector, can eliminate artificial scrambler to signal detection
Influence.
FFT operation results are superimposed.It is, then the secondary signal to being truncated in previous stepRear N number of data into
The FFT computings of row N points, and the result of computing is equally multiplied by corresponding with transmitting terminal phase factor vector, then withRespectively
Element, which corresponds to, to be added, and the result of addition is stored inIn, that is, have
And k is integer
OQAM is demodulated.To the data after processingCarry out OQAM demodulation, the real part or void of signal after being demodulated
Portion.
An embodiment of the present invention provides a kind of Offset Quadrature Amplitude modulated filter group multi-carrier signal detection method, application
In data receiver, for the data receiver according to default interception rule, it is one group of number of kN to intercept points in baseband signal
As the first signal, wherein N is transmitting terminal number of subcarriers at strong point, and k is the weight that transmitting terminal carries out original signal periodic extension
The folded factor；First signal is filtered according to filtering mode corresponding with transmitting terminal, obtains secondary signal；By described
Binary signal is averagely cut into respective numbers N point signal segments in time domain, and fast Fourier is carried out to each N points signal segment
Conversion, obtains the N point signals after respective numbers conversion；N point signals after each conversion are scrambled according to transmitting terminal
Mode is corresponding to go the mode of disturbing disturb, and obtains respective numbers and goes to disturb N point signals；The respective numbers are gone to disturb N points
The data point of correspondence position in signal is added, and obtains a N points signal to be determined；Using Offset Quadrature Amplitude modulation pair
The demodulation mode answered is demodulated the signal to be determined, the real part or imaginary part of signal after being demodulated.Due to the present invention
To the N point signals after each conversion, according to being scrambled with transmitting terminal, mode is corresponding to go the mode of disturbing to be gone in embodiment
Disturb, the difference between the real part of signal for recovering to obtain or imaginary part and original signal can be removed, so recover to obtain it is accurate
Original signal.
Fig. 8 is a kind of Offset Quadrature Amplitude modulated filter group multi-carrier signal detection device provided in an embodiment of the present invention
Structure diagram, which is applied to data receiver, and described device can include：
Baseband signal interception module 801, for according to default interception rule, it to be the one of kN to intercept points in baseband signal
For group data point as the first signal, wherein N is transmitting terminal number of subcarriers, and k carries out periodic extension for transmitting terminal to original signal
Overlap factor；
Filter module 802, for first signal to be filtered according to filtering mode corresponding with transmitting terminal, obtains
Secondary signal；
Fast Fourier transform module 803, for the secondary signal to be averagely cut into respective numbers N in time domain
Point signal segment, carries out Fast Fourier Transform (FFT) to each N points signal segment, obtains the N point signals after respective numbers conversion；
Go to disturb module 804, for by the N point signals after each conversion, according to scrambling with transmitting terminal, mode is corresponding to go
The mode of disturbing disturb, and obtains respective numbers and goes to disturb N point signals；
Laminating module 805, for going the data point for disturbing the correspondence position in N point signals to carry out phase the respective numbers
Add, obtain a N points signal to be determined；
Demodulation module 806, for using Offset Quadrature Amplitude modulate corresponding demodulation mode to the signal to be determined into
Row demodulation, the real part or imaginary part of signal after being demodulated.
Further, described device further includes：
Data cutout module (not shown), for the letter from the center section of current secondary signal interception preset length
Number section is as secondary signal.
Further, it is described to go to disturb module 804, including：
Submodule (not shown) is divided, for according to the division rule identical with transmitting terminal, each being converted described
N point signals afterwards, are divided into several subsignals in time domain；
Go to disturb submodule (not shown), for for each subsignal, being multiplied by phase corresponding with transmitting terminal respectively
Same interference factor vector.
Further, the demodulation module 806, including：
Judging submodule (not shown), for according to data sending terminal send real and imaginary parts in each signal when
Carve, and at the time of receiving each real and imaginary parts of preservation, judge presently described first signal for corresponding real part or void
Portion；
Real imaginary part determination sub-module (not shown), if judging presently described first signal for the judging submodule
Real part is corresponded to, then the real part using the signal to be determined as signal；If the judging submodule judges presently described first letter
Number corresponding imaginary part, then will be used as the imaginary part of signal, wherein T is transmitting terminal original signal after the signal delay T/2 to be determined
Time domain length.
Further, described device further includes：
Composite module (not shown), is mesh for the real part of the signal to be combined to output with the imaginary part of the signal
Mark signal.
An embodiment of the present invention provides a kind of Offset Quadrature Amplitude modulated filter group multi-carrier signal detection method and dress
Put, applied to data receiver, for the data receiver according to default interception rule, it is kN's to intercept points in baseband signal
For one group of data point as the first signal, wherein N is transmitting terminal number of subcarriers, and k prolongs the original signal progress cycle for transmitting terminal
The overlap factor opened up；First signal is filtered according to filtering mode corresponding with transmitting terminal, obtains secondary signal；Will
The secondary signal is averagely cut into respective numbers N point signal segments in time domain, each N points signal segment is carried out quick
Fourier transformation, obtains the N point signals after respective numbers conversion；By the N point signals after each conversion according to transmission
Scrambling mode is corresponding goes the mode of disturbing disturb at end, obtains respective numbers and goes to disturb N point signals；The respective numbers are gone
The data point for disturbing the correspondence position in N point signals is added, and obtains a N points signal to be determined；Using Offset Quadrature Amplitude
Modulate corresponding demodulation mode to be demodulated the signal to be determined, the real part or imaginary part of signal after being demodulated.Due to
To the N point signals after each conversion, according to being scrambled with transmitting terminal, mode is corresponding to go the mode of disturbing to carry out in the embodiment of the present invention
Go to disturb, can remove the signal for recovering to obtain real part or imaginary part and original signal between difference, and then recover to obtain
Accurate original signal.
For systems/devices embodiment, since it is substantially similar to embodiment of the method, so the comparison of description is simple
Single, the relevent part can refer to the partial explaination of embodiments of method.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only will including those
Element, but also including other elements that are not explicitly listed, or further include as this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there are other identical element in process, method, article or equipment including the key element.
Can one of ordinary skill in the art will appreciate that realizing that all or part of step in above method embodiment is
To instruct relevant hardware to complete by program, the program can be stored in computer read/write memory medium,
The storage medium designated herein obtained, such as：ROM/RAM, magnetic disc, CD etc..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (10)
1. a kind of Offset Quadrature Amplitude modulated filter group multi-carrier signal detection method, it is characterised in that connect applied to data
Receiving end, the method includes the steps：
According to default interception rule, intercept points in baseband signal is as the first signal, wherein N for one group of data point of kN
Transmitting terminal number of subcarriers, k are the overlap factor that transmitting terminal carries out M signal periodic extension；
First signal is filtered according to filtering mode corresponding with transmitting terminal, obtains secondary signal；
The secondary signal is averagely cut into respective numbers N point signal segments in time domain, to each N point signal segments into
Row Fast Fourier Transform (FFT), obtains the N point signals after respective numbers conversion；
By the N point signals after each conversion according to mode is corresponding goes the mode of disturbing disturb with transmitting terminal scrambling, obtain
Respective numbers go to disturb N point signals；
The data point that the respective numbers go to disturb the correspondence position in N point signals is added, it is to be determined to obtain a N point
Signal；
Corresponding demodulation mode is modulated using Offset Quadrature Amplitude to be demodulated the signal to be determined, signal after being demodulated
Real part or imaginary part.
2. according to the method described in claim 1, it is characterized in that, it is described by first signal according to corresponding with transmitting terminal
Filtering mode be filtered, respective numbers are averagely cut into time domain after obtaining secondary signal, by the secondary signal
A N points signal segment, Fast Fourier Transform (FFT) is carried out to each N points signal segment, obtains the N points letter after respective numbers conversion
Before number, the method further includes：
The signal segment of preset length is intercepted as secondary signal from the center section of current secondary signal.
3. according to the method described in claim 1, it is characterized in that, the N point signals by after each conversion according to
Mode is corresponding goes the mode of disturbing disturb for transmitting terminal scrambling, obtains respective numbers and goes to disturb N point signals, including：
According to the division rule identical with transmitting terminal, by the N point signals after each conversion, several are divided into time domain
Subsignal；
For each subsignal, it is multiplied by respectively and the corresponding identical interference factor vector of transmitting terminal.
4. according to the method described in claim 1, it is characterized in that, described modulate corresponding demodulation side using Offset Quadrature Amplitude
Formula is demodulated the signal to be determined, the real part or imaginary part of signal after being demodulated, including：
At the time of sending real and imaginary parts in each signal according to data sending terminal, and what is preserved receive each real and imaginary parts
At the time of, judge presently described first signal for corresponding real part or imaginary part；
If corresponding real part, the real part using the signal to be determined as signal；
If corresponding imaginary part, using the imaginary part after the signal delay T/2 to be determined as signal, wherein T is the original letter of transmitting terminal
Number time domain length.
5. according to the method described in claim 1, it is characterized in that, the method further includes：
It is echo signal that the real part of the signal is combined output with the imaginary part of the signal.
6. a kind of Offset Quadrature Amplitude modulated filter group multi-carrier signal detection device, it is characterised in that connect applied to data
Receiving end, described device include：
Baseband signal interception module, for according to default interception rule, it to be one group of data of kN to intercept points in baseband signal
Point is used as the first signal, and wherein N is transmitting terminal number of subcarriers, and k is that transmitting terminal carries out the overlapping of periodic extension to original signal
The factor；
Filter module, for first signal to be filtered according to filtering mode corresponding with transmitting terminal, obtains the second letter
Number；
Fast Fourier transform module, for the secondary signal to be averagely cut into respective numbers N point signals in time domain
Section, carries out Fast Fourier Transform (FFT) to each N points signal segment, obtains the N point signals after respective numbers conversion；
Go to disturb module, for by the N point signals after each conversion, according to scrambling with transmitting terminal, mode is corresponding to go the mode of disturbing
Disturb, obtain respective numbers and go to disturb N point signals；
Laminating module, the data point for going to disturb the correspondence position in N point signals by the respective numbers are added, are obtained
One N points signal to be determined；
Demodulation module, is demodulated the signal to be determined for modulating corresponding demodulation mode using Offset Quadrature Amplitude,
The real part or imaginary part of signal after being demodulated.
7. device according to claim 6, it is characterised in that described device further includes：
Data cutout module, for the signal segment from the center section of current secondary signal interception preset length as the second letter
Number.
8. device according to claim 6, it is characterised in that it is described to go to disturb module, including：
Divide submodule, for according to the division rule identical with transmitting terminal, by the N point signals after each conversion, when
Several subsignals are divided on domain；
Go to disturb submodule, for for each subsignal, being multiplied by respectively and the corresponding identical interference factor vector of transmitting terminal.
9. device according to claim 6, it is characterised in that the demodulation module, including：
Judging submodule, at the time of for sending real and imaginary parts in each signal according to data sending terminal, and the reception preserved
At the time of to each real and imaginary parts, judge presently described first signal for corresponding real part or imaginary part；
Real imaginary part determination sub-module, if judging that presently described first signal corresponds to real part for the judging submodule, by institute
State real part of the signal to be determined as signal；, will if the judging submodule judges that presently described first signal corresponds to imaginary part
Imaginary part after the signal delay T/2 to be determined as signal, wherein T is the time domain length of transmitting terminal original signal.
10. device according to claim 6, it is characterised in that described device further includes：
Composite module, is echo signal for the real part of the signal to be combined to output with the imaginary part of the signal.
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| EP1158716B1 (en) * | 2000-05-22 | 2009-04-22 | AT&T Corp. | MIMO OFDM system |
| CN102497348A (en) * | 2011-12-18 | 2012-06-13 | 浙江大学 | Method used for improving time domain pulse interference resistance of filter bank based multicarrier system (FBMC) |
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| EP1158716B1 (en) * | 2000-05-22 | 2009-04-22 | AT&T Corp. | MIMO OFDM system |
| CN101378373A (en) * | 2007-08-30 | 2009-03-04 | 电子科技大学 | Method and device for processing multi-carrier data |
| CN102497348A (en) * | 2011-12-18 | 2012-06-13 | 浙江大学 | Method used for improving time domain pulse interference resistance of filter bank based multicarrier system (FBMC) |
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