CN105356918A - Multi-carrier signal detection method and device of offset quadrature amplitude modulation filter bank - Google Patents
Multi-carrier signal detection method and device of offset quadrature amplitude modulation filter bank Download PDFInfo
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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 multi-carrier signal detection method and device of an offset quadrature amplitude modulation filter bank. The multi-carrier signal detection method and device are applied to a data receiving terminal. The data receiving terminal intercepts a first signal in a baseband signal and filters the first signal to obtain a second signal; the second signal is averagely decomposed into a corresponding number of N point signals; fast Fourier transform is carried out on each N point signal to obtain the corresponding number of converted N point signals; each converted N point signal is descrambled according to a descrambling mode corresponding to a transmitting terminal scrambling mode, so as to obtain the corresponding number of descrambled N point signals; and the corresponding number of descrambled N point signals are superposed and then OQAM demodulation is carried out to obtain a real part or an imaginary part of the signal. According to the multi-carrier signal detection method and device of the offset quadrature amplitude modulation filter bank, each converted N point signal is descrambled according to the descrambling mode corresponding to the transmitting terminal scrambling mode, so that the receiving terminal can restore the real part or the imaginary part of the original signal.
Description
Technical field
The present invention relates to the communications field, particularly a kind of Offset Quadrature Amplitude modulated filter bank multi-carrier signal detection method and device.
Background technology
Filter bank multi-carrier technology (FBMC) is compared to traditional multi-transceiver technology, there is the ability of stronger anti-multipath jamming, complex contradiction between the balanced reception technology that can process high-rate wireless communication and complexity is preferably one of core technology of future new era system of broadband wireless communication.As the one of FBMC system implementations, Offset Quadrature Amplitude modulated filter bank multi-transceiver technology (FBMC-OQAM) has converged the multiple advantage of FBMC technology.This technology have employed multicarrier orthogonal condition, ensure that data receiver can be complete reduction received by input signal and also not by the impact of intersymbol interference and inter-carrier interference.
Existing FBMC-OQAM technology as shown in Figure 1, real part and the imaginary part of each primary signal alternately input data sending terminal, described data sending terminal is for the signal of current input, successively Offset Quadrature Amplitude modulation (OQAM), Fast Fourier Transform Inverse (IFFT), prototype filter filtering and Signal averaging are carried out to it, export baseband signal; Data receiver is synchronous from described baseband signal obtains pending signal, described pending signal is carried out the prototype filter filtering identical with described data sending terminal, again the M signal of acquisition is carried out fast Fourier transform (FFT) and OQAM demodulation successively, final real part or the imaginary part alternately exporting restoring signal, using the real part of described restoring signal or imaginary part as the real part of corresponding primary signal or imaginary part.
In existing FBMC-OQAM technology, the intermediate data often produced data sending terminal is multiplied by one group of suitable phase interference factor, namely artificial scrambler is added, to process transmission signal, and then reach certain treatment effect, as reduced the peak-to-average power ratio (PAPR) etc. sending signal.As shown in Figure 2, the M signal after OQAM modulation can be multiplied by the default phase interference factor by data sending terminal, namely adds artificial scrambler; But, existing FBMC-OQAM technology at data receiver still according to original mode process, replace real part or the imaginary part of the close restoring signal of output and described primary signal real part or imaginary part, but the method is recovered the real part of the signal obtained or be there are differences between imaginary part and primary signal, and the primary signal therefore recovering to obtain is inaccurate.
Summary of the invention
The embodiment of the invention discloses a kind of Offset Quadrature Amplitude modulated filter bank multi-carrier signal detection method and device, can recover to obtain primary signal accurately.
For achieving the above object, the embodiment of the invention discloses a kind of Offset Quadrature Amplitude modulated filter bank multi-carrier signal detection method, be applied to data receiver, described method comprises step:
According to the intercepting rule preset, count in intercept baseband signal as one group of data point of kN is as the first signal, wherein N is transmitting terminal number of subcarriers, and k is that transmitting terminal carries out the overlap factor of periodic extension to M signal;
Described first signal is carried out filtering according to the filtering mode corresponding with transmitting terminal, obtains secondary signal;
Described secondary signal is on average cut in time domain a respective numbers N point signal segment, fast Fourier transform is carried out to each described N point signal segment, obtain the N point signal after a respective numbers conversion;
N point signal after each described conversion is carried out disturbing according to the mode of disturbing of going corresponding with transmitting terminal scrambling mode, obtains respective numbers and go to disturb N point signal;
Go the data point of the correspondence position of disturbing in N point signal to be added described respective numbers, obtain a N point signal to be determined;
Adopt demodulation mode corresponding to Offset Quadrature Amplitude modulation to carry out demodulation to described signal to be determined, obtain real part or the imaginary part of signal after demodulation.
Preferably, described, described first signal is carried out filtering according to the filtering mode corresponding with transmitting terminal, in time domain, a respective numbers N point signal segment is on average cut into after obtaining secondary signal, by described secondary signal, fast Fourier transform is carried out to each described N point signal segment, before obtaining the N point signal after a respective numbers conversion, described method also comprises:
The signal segment of preset length is intercepted as secondary signal from the mid portion of current secondary signal.
Preferably, described N point signal after each described conversion is carried out disturbing according to the mode of disturbing of going corresponding with transmitting terminal scrambling mode, obtains respective numbers and go to disturb N point signal, comprising:
According to the division rule identical with transmitting terminal, by the N point signal after described each conversion, time domain is divided into several subsignals;
For each described subsignal, be multiplied by identical interference factor corresponding to transmitting terminal vector respectively.
Preferably, demodulation mode corresponding to described employing Offset Quadrature Amplitude modulation carries out demodulation to described signal to be determined, obtains real part or the imaginary part of signal after demodulation, comprising:
The moment of real part and imaginary part in each signal is sent according to data sending terminal, and the moment receiving each real part and imaginary part of preserving, judge that current described first signal is corresponding real part or imaginary part;
If corresponding real part, then by the signal real part of described signal to be determined;
If corresponding imaginary part, then by signal imaginary part after described signal lag T/2 to be determined, wherein T is the time domain length of transmitting terminal primary signal.
Preferably, described method also comprises:
Be echo signal by the imaginary part array output of the real part of described signal and described signal.
The embodiment of the invention also discloses a kind of Offset Quadrature Amplitude modulated filter bank multi-carrier signal checkout gear, be applied to data receiver, described device comprises:
Baseband signal interception module, for regular according to the intercepting preset, count in intercept baseband signal as one group of data point of kN is as the first signal, wherein N is transmitting terminal number of subcarriers, and k is that transmitting terminal carries out the overlap factor of periodic extension to primary signal;
Filtration module, for described first signal is carried out filtering according to the filtering mode corresponding with transmitting terminal, obtains secondary signal;
Fast Fourier transform module, for described secondary signal being on average cut in time domain a respective numbers N point signal segment, carries out fast Fourier transform to each described N point signal segment, obtains the N point signal after a respective numbers conversion;
Go to disturb module, for the N point signal after each described conversion is carried out disturbing according to the mode of disturbing of going corresponding with transmitting terminal scrambling mode, obtain respective numbers and go to disturb N point signal;
Laminating module, for going the data point of the correspondence position of disturbing in N point signal to be added described respective numbers, obtains a N point signal to be determined;
Demodulation module, modulates corresponding demodulation mode for adopting Offset Quadrature Amplitude and carries out demodulation to described signal to be determined, obtains real part or the imaginary part of signal after demodulation.
Preferably, described device also comprises:
Data cutout module, for intercepting the signal segment of preset length as secondary signal from the mid portion of current secondary signal.
Preferably, described in go to disturb module, comprising:
Divide submodule, for according to the division rule identical with transmitting terminal, by the N point signal after described each conversion, time domain is divided into several subsignals;
Go to disturb submodule, for for each described subsignal, be multiplied by identical interference factor corresponding to transmitting terminal vector respectively.
Preferably, described demodulation module, comprising:
Judge submodule, for sending the moment of real part and imaginary part in each signal according to data sending terminal, and the moment receiving each real part and imaginary part of preserving, judge that current described first signal is corresponding real part or imaginary part;
Real imaginary part determination submodule, if judge the corresponding real part of current described first signal, then by the signal real part of described signal to be determined for described judgement submodule; If described judgement submodule judges the corresponding imaginary part of current described first signal, then by signal imaginary part after described signal lag T/2 to be determined, wherein T is the time domain length of transmitting terminal primary signal.
Preferably, described device also comprises:
Composite module, for being echo signal by the imaginary part array output of the real part of described signal and described signal.
As seen from the above technical solutions, embodiments provide a kind of Offset Quadrature Amplitude modulated filter bank multi-carrier signal detection method and device, be applied to data receiver, described data receiver is according to the intercepting rule preset, count as one group of data point of kN is as the first signal in intercept baseband signal, wherein N is transmitting terminal number of subcarriers, and k is that transmitting terminal carries out the overlap factor of periodic extension to primary signal; Described first signal is carried out filtering according to the filtering mode corresponding with transmitting terminal, obtains secondary signal; Described secondary signal is on average cut in time domain a respective numbers N point signal segment, fast Fourier transform is carried out to each described N point signal segment, obtain the N point signal after a respective numbers conversion; N point signal after each described conversion is carried out disturbing according to the mode of disturbing of going corresponding with transmitting terminal scrambling mode, obtains respective numbers and go to disturb N point signal; Go the data point of the correspondence position of disturbing in N point signal to be added described respective numbers, obtain a N point signal to be determined; Adopt demodulation mode corresponding to Offset Quadrature Amplitude modulation to carry out demodulation to described signal to be determined, obtain real part or the imaginary part of signal after demodulation.Owing to having carried out going to disturb according to go the disturb mode corresponding with transmitting terminal scrambling mode to the N point signal after each described conversion in the embodiment of the present invention, the real part of signal or the difference between imaginary part and primary signal that recover to obtain can be removed, and then recover to obtain primary signal accurately.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is existing FBMC-OQAM techniqueflow schematic diagram;
Fig. 2 is the existing FBMC-OQAM techniqueflow schematic diagram adding the phase interference factor;
The schematic flow sheet of a kind of Offset Quadrature Amplitude modulated filter bank multi-carrier signal detection method that Fig. 3 provides for the embodiment of the present invention one;
The data sending terminal that Fig. 4 provides for the embodiment of the present invention carries out periodic extension to M signal and utilizes prototype filter to carry out the schematic diagram of filtering;
What Fig. 5 provided for the embodiment of the present invention carries out the schematic diagram of Scrambling Operation to signal after modulation;
What Fig. 6 provided for the embodiment of the present invention carries out the schematic diagram of segmentation Scrambling Operation to signal after modulation;
A kind of FBMC-OQAM signal detection system block diagram that Fig. 7 provides for the embodiment of the present invention;
The structural representation of a kind of Offset Quadrature Amplitude modulated filter bank multi-carrier signal checkout gear that Fig. 8 provides for the embodiment of the present invention one.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Below by specific embodiment, the present invention is described in detail.
The schematic flow sheet of a kind of Offset Quadrature Amplitude modulated filter bank multi-carrier signal detection method that Fig. 3 provides for the embodiment of the present invention one, described method is applied to data receiver, and the method can comprise step:
S301: according to the intercepting rule preset, count in intercept baseband signal as one group of data point of kN is as the first signal.
Wherein N is transmitting terminal number of subcarriers, and k is that transmitting terminal carries out the overlap factor of periodic extension to M signal.In the transmitting terminal of prior art, before signal is carried out prototype filter filtering, M signal to be filtered is needed to carry out periodic extension, be the length identical with described prototype filter by the length continuation of this M signal, as shown in Figure 4, the length of described M signal is N, and described M signal is carried out periodic extension according to integer k, obtain the overall signal that length is kN, recycling prototype filter carries out filtering to described overall signal.In embodiments of the present invention, suppose signal that transmitting terminal receives to be length be the signal of N, then N is also transmitting terminal number of subcarriers simultaneously, and the length of described M signal to be filtered is also N; Because in embodiments of the present invention, the length of described prototype filter is the integral multiple of the length of described M signal, so in embodiments of the present invention, described integer can be defined as overlap factor k M signal being carried out to periodic extension.Described from baseband signal according to preset rules, counting as one group of data point of kN is as the first signal in intercept baseband signal, when object is to carry out follow-up prototype filter filtering, making described first signal have identical length with described prototype filter.
To the determination of data sending terminal number of subcarriers N, transmitting terminal is carried out M signal the overlap factor k of periodic extension determination and prior art is defined as to described first signal, the present invention repeats no more.
S302: described first signal is carried out filtering according to the filtering mode corresponding with transmitting terminal, obtains secondary signal.
In embodiments of the present invention, data receiver has the prototype filter group identical with data sending terminal, the first signal for receiving described data receiver carries out filtering, if the length of described first signal is kN, then the length of the secondary signal obtained through step S302 is also kN.
Described filtering is prior art, and the present invention repeats no more.
S303: described secondary signal is on average cut in time domain a respective numbers N point signal segment, carries out fast Fourier transform to each described N point signal segment, obtains the N point signal after a respective numbers conversion.
Process described in step S303 is prior art, and the present invention repeats no more.
S304: carried out disturbing according to the mode of disturbing of going corresponding with transmitting terminal scrambling mode by the N point signal after each described conversion, obtains respective numbers and goes to disturb N point signal.
In data sending terminal, after signal is carried out OQAM modulation, signal after the modulation obtained can be carried out scrambling process, described data receiver utilizes and carries out the identical mode of scrambling process with described data sending terminal, goes to disturb process to the signal in data receiver.
In embodiments of the present invention, can by signal times after described modulation with one group of interference factor vector, as the scrambling process to signal after described modulation, as shown in Figure 5, each data point after modulation in signal is multiplied by the corresponding element in described interference factor vector, be equivalent to change the energy of data point in signal after described modulation, the object done like this, being the inherent shortcoming in order to overcome multi-carrier modulation, sending the peak-to-average power ratio (PAPR) etc. of signal as reduced data sending terminal.In described step S304, describedly corresponding with transmitting terminal scrambling mode go the mode of disturbing, by the N point signal times after each described conversion with signal after the modulation corresponding with data sending terminal take advantage of identical interference factor vector, obtain described respective numbers to go to disturb N point signal, wherein, can preserve the mapping table of the N point signal after described conversion and data sending terminal interference factor vector in described data receiver, thus which interference factor vector the N point signal after can determining the conversion of current described respective numbers by the mode of look-up table should be multiplied by.
S305: go the data point of the correspondence position of disturbing in N point signal to be added described respective numbers, obtain a N point signal to be determined.
Go to disturb N point signal by described respective numbers to superpose, using the signal after superposition as signal to be determined.
S306: adopt demodulation mode corresponding to Offset Quadrature Amplitude modulation to carry out demodulation to described signal to be determined, obtains real part or the imaginary part of signal after demodulation.
Due in practical operation, the baseband signal that described data receiver receives is formed through time domain superposition by multiple different filtered signal, and described filtered signal is via Fast Fourier Transform Inverse by signal after scrambling, and then in baseband signal, also maintain transition state and the overlaying state of interference factor, so data receiver needs to split and fast Fourier transform described secondary signal successively, the i.e. overlaying state of interference factor and transition state in corresponding removal institute secondary signal, and then interference factor in signal can be removed by corresponding with the transmitting terminal scrambling mode mode of disturbing of going.
The demodulation mode of described Offset Quadrature Amplitude modulation correspondence is the inverse operation of described Offset Quadrature Amplitude modulation, when data receiver described in this judges that current signal to be determined corresponds to the real part of primary signal, then the signal real part of the direct data by this input; When this module judges that current signal to be determined corresponds to the imaginary part of primary signal, then using the real part of the data delay T/2 of this input as described signal, wherein T is the time domain cycle of the primary signal in data sending terminal input.Wherein, judge that current signal to be determined corresponds to the real part of primary signal or the method for imaginary part is the method for prior art, the present invention repeats no more.
The embodiment of the present invention is multiplied by one group of phase interference factor at the intermediate data produced data sending terminal, when namely adding artificial scrambler, the data receiver caused cannot recover the real part of primary signal or the problem of imaginary part, at data receiver, corresponding M signal is carried out disturbing according to the mode of disturbing of going corresponding with transmitting terminal scrambling mode, operation after carrying out again, enables receiving terminal recover real part or the imaginary part of primary signal.
In another kind of embodiment provided by the invention, partial data point can be intercepted out carry out subsequent process, to reduce the operand of subsequent treatment from described secondary signal.Based on the method described in the embodiment of the present invention one, after described step S302, before described step S303, method shown in Fig. 3 can also comprise:
The signal segment of preset length is intercepted as secondary signal from the mid portion of current secondary signal.
The described mid portion from current secondary signal intercepts the principle of the signal segment of preset length, and the secondary signal formed for making the signal segment of described preset length still preserves the main energetic in original secondary signal.In actual applications, described k value is the integral number power of 2, and usually k value is the numerical value being more than or equal to 22 such as 4,8,16, at this moment, kN/4 point of current secondary signal head and kN/4 data point of afterbody can be rejected, retain kN/2 point of mid portion as secondary signal, the length namely intercepting current secondary signal mid portion is that the signal segment of kN/2 is as secondary signal.
In embodiments of the present invention, described data receiver intercepts the signal segment of preset length as secondary signal from the mid portion of current secondary signal, reduces the number of data points of described secondary signal, and then decreases the operand of subsequent treatment.
In the data sending terminal of the embodiment of the present invention, signal after the modulation obtained is carried out scrambling process, generally includes step:
According to the division rule preset, be several blocks by division of signal after described modulation;
Block described in each is made to be multiplied by the interference factor vector corresponding with this block.
The above-mentioned scrambling mode of described data sending terminal as shown in Figure 6, after modulating, signal A (n) is according to the division rule preset, time domain is divided into A1 (n), A2 (n) ..., this x of Ax (n) block, correspondence be multiplied by interference factor vector 1, interference factor vector 2 ..., this x of interference factor vector x interference factor vector, obtain signal A ' (n) after total scrambling.Accordingly, the above-mentioned scrambling mode of corresponding described data sending terminal, based on the method described in the embodiment of the present invention one, described step S304 can comprise:
According to the division rule identical with transmitting terminal, by the N point signal after described each conversion, time domain is divided into several subsignals;
For each described subsignal, be multiplied by identical interference factor corresponding to transmitting terminal vector respectively.
Wherein, by the respective signal block judgment technology preset, determine each subsignal described in current data reception end corresponds to which block in data sending terminal, and then can determine which interference factor vector current described each subsignal should be multiplied by.Described default respective signal block judgment technology is prior art, and the present invention repeats no more.
In embodiments of the present invention, for described data sending terminal according to the division rule preset, be several blocks by division of signal after described modulation, block described in each is made to be multiplied by the scrambling mode of the interference factor vector corresponding with this block, described data receiver is correspondingly by the N point signal after described each conversion, time domain is divided into several subsignals, for each described subsignal, be multiplied by identical interference factor corresponding to transmitting terminal vector respectively, described in making, go the method for disturbing practical more flexibly.
In another kind of embodiment provided by the invention, first can judge that current signal to be determined corresponds to real part or the imaginary part of primary signal, according to judged result, described signal to be determined be processed, be defined as real part or the imaginary part of signal.Based on the method described in the embodiment of the present invention one, described step S306 can comprise:
The moment of real part and imaginary part in each signal is sent according to data sending terminal, and the moment receiving each real part and imaginary part of preserving, judge that current described first signal is corresponding real part or imaginary part;
Can when described data receiver preserve in advance described data sending terminal send real part and imaginary part in each signal when, and receive the mapping table in moment of each real part and imaginary part, determine that current described first signal is corresponding real part or imaginary part according to described mapping table.As the known signal that data sending terminal sends as described in 0 moment, can be received by described data receiver in 5 moment and be converted to described first signal, then can determine, if what data sending terminal described in 0 moment sent be reality (void) portion of signal, then described first signal of data receiver described in 5 moment is reality (void) portion of correspondence.
More than judge that current described first signal is a kind of method that the embodiment of the present invention provides as the real part of correspondence or the method for imaginary part, in actual applications, also have other method available.Judge that current described first signal be the method for corresponding real part or imaginary part is prior art, the present invention repeats no more.
If corresponding real part, then by the signal real part of described signal to be determined;
If corresponding imaginary part, then by signal imaginary part after described signal lag T/2 to be determined, wherein T is the time domain length of transmitting terminal primary signal.
In embodiments of the present invention, described data receiver, according to the method judging the corresponding real part of described first signal or imaginary part, judges the corresponding real part of described first signal or imaginary part, according to described judged result, judges or next step operation to described signal to be determined.
In another kind of embodiment provided by the invention, by the real part of fixed signal and imaginary part, echo signal can be combined into and export.Based on the method described in the embodiment of the present invention one, described method can also comprise:
Be echo signal by the imaginary part array output of the real part of described signal and described signal.
The described imaginary part array output by the real part of described signal and described signal is the method for echo signal is prior art, and the present invention repeats no more.
Be illustrated in figure 7 a kind of FBMC-OQAM signal detection system block diagram that the embodiment of the present invention provides, the method shown in this block diagram is:
Data sending terminal calculates prototype filter function h (n) identical with data sending terminal, and, the length of this prototype filter is L=kN, the wherein number of N data sending terminal subcarrier, and k is that transmitting terminal carries out the overlap factor of periodic extension to M signal.
Order
and n is integer,
be used for depositing the data after FFT calculation process.L=0 represents that system is from the l=0 moment.
One group of L point data is got as the first signal in baseband signal r (n), then this first signal is carried out filtering according to the filtering mode corresponding with transmitting terminal, namely be multiplied by filter function h (n-lN/2), carry out filtering by this first signal through the prototype filter corresponding in time domain with it, obtain secondary signal
namely have
and n is integer, wherein, l=0,1,2..., l get different value and represent to be not the first signal in the same time when pre-treatment.
Data cutout is carried out to described secondary signal.Because the waveform of the time domain of prototype filter function h (n) and frequency domain all has good time-frequency focusing, by the power spectrumanalysis to prototype filter, find that energy mainly concentrates on h (n), n ∈ [T, kT-T] and n is the part of integer, k=4 in the present embodiment, namely can reject the top n point in described secondary signal and rear N number of point, only retains 2N point of mid portion.So intercept
2N point of mid portion, as secondary signal
wherein T is the time domain length of transmitting terminal primary signal.
To the secondary signal be truncated in previous step
first get the FFT computing that its top n data carry out N point, the result of computing leaves in
in, be also
right again
carry out artificial scrambler Processing for removing, be about to
be multiplied by the phase factor vector corresponding with transmitting terminal, just can eliminate the impact on input of artificial scrambler.
FFT operation result superposes.Namely, then to the secondary signal be truncated in previous step
rear N number of data carry out the FFT computing of N point, and the result of computing is multiplied by equally the phase factor vector corresponding with transmitting terminal, then with
each element correspondence is added, and the result of addition leaves in
in, namely have
OQAM demodulation.To the data after process
carry out OQAM demodulation, obtain real part or the imaginary part of signal after demodulation.
Embodiments provide a kind of Offset Quadrature Amplitude modulated filter bank multi-carrier signal detection method, be applied to data receiver, described data receiver is according to the intercepting rule preset, count as one group of data point of kN is as the first signal in intercept baseband signal, wherein N is transmitting terminal number of subcarriers, and k is that transmitting terminal carries out the overlap factor of periodic extension to primary signal; Described first signal is carried out filtering according to the filtering mode corresponding with transmitting terminal, obtains secondary signal; Described secondary signal is on average cut in time domain a respective numbers N point signal segment, fast Fourier transform is carried out to each described N point signal segment, obtain the N point signal after a respective numbers conversion; N point signal after each described conversion is carried out disturbing according to the mode of disturbing of going corresponding with transmitting terminal scrambling mode, obtains respective numbers and go to disturb N point signal; Go the data point of the correspondence position of disturbing in N point signal to be added described respective numbers, obtain a N point signal to be determined; Adopt demodulation mode corresponding to Offset Quadrature Amplitude modulation to carry out demodulation to described signal to be determined, obtain real part or the imaginary part of signal after demodulation.Owing to having carried out going to disturb according to go the disturb mode corresponding with transmitting terminal scrambling mode to the N point signal after each described conversion in the embodiment of the present invention, the real part of signal or the difference between imaginary part and primary signal that recover to obtain can be removed, and then recover to obtain primary signal accurately.
The structural representation of a kind of Offset Quadrature Amplitude modulated filter bank multi-carrier signal checkout gear that Fig. 8 provides for the embodiment of the present invention, this application of installation is in data receiver, and described device can comprise:
Baseband signal interception module 801, for regular according to the intercepting preset, count in intercept baseband signal as one group of data point of kN is as the first signal, wherein N is transmitting terminal number of subcarriers, and k is that transmitting terminal carries out the overlap factor of periodic extension to primary signal;
Filtration module 802, for described first signal is carried out filtering according to the filtering mode corresponding with transmitting terminal, obtains secondary signal;
Fast Fourier transform module 803, for described secondary signal being on average cut in time domain a respective numbers N point signal segment, carries out fast Fourier transform to each described N point signal segment, obtains the N point signal after a respective numbers conversion;
Go to disturb module 804, for the N point signal after each described conversion is carried out disturbing according to the mode of disturbing of going corresponding with transmitting terminal scrambling mode, obtain respective numbers and go to disturb N point signal;
Laminating module 805, for going the data point of the correspondence position of disturbing in N point signal to be added described respective numbers, obtains a N point signal to be determined;
Demodulation module 806, modulates corresponding demodulation mode for adopting Offset Quadrature Amplitude and carries out demodulation to described signal to be determined, obtains real part or the imaginary part of signal after demodulation.
Further, described device also comprises:
Data cutout module (not shown), for intercepting the signal segment of preset length as secondary signal from the mid portion of current secondary signal.
Further, described in go to disturb module 804, comprising:
Divide submodule (not shown), for according to the division rule identical with transmitting terminal, by the N point signal after described each conversion, time domain is divided into several subsignals;
Go to disturb submodule (not shown), for for each described subsignal, be multiplied by identical interference factor corresponding to transmitting terminal vector respectively.
Further, described demodulation module 806, comprising:
Judge submodule (not shown), for sending the moment of real part and imaginary part in each signal according to data sending terminal, and the moment receiving each real part and imaginary part of preserving, judge that current described first signal is corresponding real part or imaginary part;
Real imaginary part determination submodule (not shown), if judge the corresponding real part of current described first signal, then by the signal real part of described signal to be determined for described judgement submodule; If described judgement submodule judges the corresponding imaginary part of current described first signal, then by signal imaginary part after described signal lag T/2 to be determined, wherein T is the time domain length of transmitting terminal primary signal.
Further, described device also comprises:
Composite module (not shown), for being echo signal by the imaginary part array output of the real part of described signal and described signal.
Embodiments provide a kind of Offset Quadrature Amplitude modulated filter bank multi-carrier signal detection method and device, be applied to data receiver, described data receiver is according to the intercepting rule preset, count as one group of data point of kN is as the first signal in intercept baseband signal, wherein N is transmitting terminal number of subcarriers, and k is that transmitting terminal carries out the overlap factor of periodic extension to primary signal; Described first signal is carried out filtering according to the filtering mode corresponding with transmitting terminal, obtains secondary signal; Described secondary signal is on average cut in time domain a respective numbers N point signal segment, fast Fourier transform is carried out to each described N point signal segment, obtain the N point signal after a respective numbers conversion; N point signal after each described conversion is carried out disturbing according to the mode of disturbing of going corresponding with transmitting terminal scrambling mode, obtains respective numbers and go to disturb N point signal; Go the data point of the correspondence position of disturbing in N point signal to be added described respective numbers, obtain a N point signal to be determined; Adopt demodulation mode corresponding to Offset Quadrature Amplitude modulation to carry out demodulation to described signal to be determined, obtain real part or the imaginary part of signal after demodulation.Owing to having carried out going to disturb according to go the disturb mode corresponding with transmitting terminal scrambling mode to the N point signal after each described conversion in the embodiment of the present invention, the real part of signal or the difference between imaginary part and primary signal that recover to obtain can be removed, and then recover to obtain primary signal accurately.
For systems/devices embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
One of ordinary skill in the art will appreciate that all or part of step realized in said method execution mode is that the hardware that can carry out instruction relevant by program has come, described program can be stored in computer read/write memory medium, here the alleged storage medium obtained, as: ROM/RAM, magnetic disc, CD etc.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (10)
1. an Offset Quadrature Amplitude modulated filter bank multi-carrier signal detection method, is characterized in that, be applied to data receiver, and described method comprises step:
According to the intercepting rule preset, count in intercept baseband signal as one group of data point of kN is as the first signal, wherein N is transmitting terminal number of subcarriers, and k is that transmitting terminal carries out the overlap factor of periodic extension to M signal;
Described first signal is carried out filtering according to the filtering mode corresponding with transmitting terminal, obtains secondary signal;
Described secondary signal is on average cut in time domain a respective numbers N point signal segment, fast Fourier transform is carried out to each described N point signal segment, obtain the N point signal after a respective numbers conversion;
N point signal after each described conversion is carried out disturbing according to the mode of disturbing of going corresponding with transmitting terminal scrambling mode, obtains respective numbers and go to disturb N point signal;
Go the data point of the correspondence position of disturbing in N point signal to be added described respective numbers, obtain a N point signal to be determined;
Adopt demodulation mode corresponding to Offset Quadrature Amplitude modulation to carry out demodulation to described signal to be determined, obtain real part or the imaginary part of signal after demodulation.
2. method according to claim 1, it is characterized in that, described, described first signal is carried out filtering according to the filtering mode corresponding with transmitting terminal, in time domain, a respective numbers N point signal segment is on average cut into after obtaining secondary signal, by described secondary signal, fast Fourier transform is carried out to each described N point signal segment, before obtaining the N point signal after a respective numbers conversion, described method also comprises:
The signal segment of preset length is intercepted as secondary signal from the mid portion of current secondary signal.
3. method according to claim 1, is characterized in that, is describedly carried out disturbing according to the mode of disturbing of going corresponding with transmitting terminal scrambling mode by N point signal after each described conversion, obtains respective numbers and goes to disturb N point signal, comprising:
According to the division rule identical with transmitting terminal, by the N point signal after described each conversion, time domain is divided into several subsignals;
For each described subsignal, be multiplied by identical interference factor corresponding to transmitting terminal vector respectively.
4. method according to claim 1, is characterized in that, demodulation mode corresponding to described employing Offset Quadrature Amplitude modulation carries out demodulation to described signal to be determined, obtains real part or the imaginary part of signal after demodulation, comprising:
The moment of real part and imaginary part in each signal is sent according to data sending terminal, and the moment receiving each real part and imaginary part of preserving, judge that current described first signal is corresponding real part or imaginary part;
If corresponding real part, then by the signal real part of described signal to be determined;
If corresponding imaginary part, then by signal imaginary part after described signal lag T/2 to be determined, wherein T is the time domain length of transmitting terminal primary signal.
5. method according to claim 1, is characterized in that, described method also comprises:
Be echo signal by the imaginary part array output of the real part of described signal and described signal.
6. an Offset Quadrature Amplitude modulated filter bank multi-carrier signal checkout gear, is characterized in that, be applied to data receiver, and described device comprises:
Baseband signal interception module, for regular according to the intercepting preset, count in intercept baseband signal as one group of data point of kN is as the first signal, wherein N is transmitting terminal number of subcarriers, and k is that transmitting terminal carries out the overlap factor of periodic extension to primary signal;
Filtration module, for described first signal is carried out filtering according to the filtering mode corresponding with transmitting terminal, obtains secondary signal;
Fast Fourier transform module, for described secondary signal being on average cut in time domain a respective numbers N point signal segment, carries out fast Fourier transform to each described N point signal segment, obtains the N point signal after a respective numbers conversion;
Go to disturb module, for the N point signal after each described conversion is carried out disturbing according to the mode of disturbing of going corresponding with transmitting terminal scrambling mode, obtain respective numbers and go to disturb N point signal;
Laminating module, for going the data point of the correspondence position of disturbing in N point signal to be added described respective numbers, obtains a N point signal to be determined;
Demodulation module, modulates corresponding demodulation mode for adopting Offset Quadrature Amplitude and carries out demodulation to described signal to be determined, obtains real part or the imaginary part of signal after demodulation.
7. method according to claim 6, is characterized in that, described device also comprises:
Data cutout module, for intercepting the signal segment of preset length as secondary signal from the mid portion of current secondary signal.
8. method according to claim 6, is characterized in that, described in go to disturb module, comprising:
Divide submodule, for according to the division rule identical with transmitting terminal, by the N point signal after described each conversion, time domain is divided into several subsignals;
Go to disturb submodule, for for each described subsignal, be multiplied by identical interference factor corresponding to transmitting terminal vector respectively.
9. method according to claim 6, is characterized in that, described demodulation module, comprising:
Judge submodule, for sending the moment of real part and imaginary part in each signal according to data sending terminal, and the moment receiving each real part and imaginary part of preserving, judge that current described first signal is corresponding real part or imaginary part;
Real imaginary part determination submodule, if judge the corresponding real part of current described first signal, then by the signal real part of described signal to be determined for described judgement submodule; If described judgement submodule judges the corresponding imaginary part of current described first signal, then by signal imaginary part after described signal lag T/2 to be determined, wherein T is the time domain length of transmitting terminal primary signal.
10. method according to claim 6, is characterized in that, described device also comprises:
Composite module, for being echo signal by the imaginary part array output of the real part of described signal and described signal.
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