CN104639254B - A kind of three-dimensional orthogonal frequency division multiplexed data modulator approach and data demodulation method - Google Patents

A kind of three-dimensional orthogonal frequency division multiplexed data modulator approach and data demodulation method Download PDF

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CN104639254B
CN104639254B CN201510040621.7A CN201510040621A CN104639254B CN 104639254 B CN104639254 B CN 104639254B CN 201510040621 A CN201510040621 A CN 201510040621A CN 104639254 B CN104639254 B CN 104639254B
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CN104639254A (en
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邓磊
王小龙
唐明
付松年
沈平
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Huazhong University of Science and Technology
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Abstract

The present invention relates to fiber optic communication field, a kind of three-dimensional orthogonal frequency division multiplexed data modulator approach and data demodulation method are disclosed, to solve that signal PAPR technical problem can not be reduced in the case where ensureing not influenceing system other performance in the prior art.The detailed process of this method is to carry out three-dimensional data constellation point to sent bit sequence, obtains the orthogonal frequency division multiplex OFDM symbol based on three-dimensional mapping;It is final to carry out three tunnel superpositions by the real and imaginary parts of complex time domain signal of the obtained three-dimensional OFDM symbol after three-dimensional inverse Fourier transform (3D IDFT) respectively by three-dimensional CAP orthogonal filters, and it is combined into final transmission time domain data;Data to be transmitted is obtained by the time-domain signal of 3D CAP ofdm systems and data to be transmitted is sent, reached in the case where not influenceing communication system other performance, effectively reduction signal PAPR technique effect.

Description

A kind of three-dimensional orthogonal frequency division multiplexed data modulator approach and data demodulation method
Technical field
The present invention relates to fiber optic communication field, more particularly to a kind of three-dimensional orthogonal frequency division multiplexed data modulator approach and data Demodulation method.
Background technology
OFDM (OFDMs:Orthogonal Frequency Division Multiplexing) technology, be A kind of availability of frequency spectrum very high technology, there is a very big potential value in following high speed length is away from communication system, but PAPR (peak-to-average power ratio:Peak to Average Power Ratio) it is too high be always a very serious defect, higher PAPR Transmission range of amplifier, optical fiber to system etc. is proposed very high requirement.Method on reducing PAPR has many kinds, The such as Transmission system based on slicing, the Transmission system based on partial transmission sequence, Transmission system based on carrier wave interference etc..
But in these reductions PAPR to realize in the transmission experiment compared with high non-linearity tolerance, the defect existed has a lot, On in the Transmission system of slicing, in order to reduce peak power, the high-power point in useful signal can typically be reamed, this causes Useful information is lost;And in the Transmission system of part selection sequence, due to needing to receive partial transmission sequence in receiving terminal The phase factor that algorithm is produced, certain expense, that is, side information are often produced in transmitting terminal, is estimated even in based on blind In the partial transmission sequence system of meter, complex phase factor blind estimate algorithm can be also needed in receiving terminal;And based on load The system of wave interference, in the case where obtaining relatively low peak-to-average power ratio, bit error rate performance cannot be lifted.As can be seen here, it is existing Have and existed in technology and can not reduce PAPR technical problem in the case where ensureing not influenceing system other performance.
The content of the invention
The present invention provides a kind of data transmission method, data receiver method, to solve to ensure not in the prior art In the case of influence system other performance, while reducing PAPR technical problem.
In a first aspect, the embodiment of the present invention provides three-dimensional orthogonal frequency division multiplexed data modulator approach, including:
Three-dimensional data constellation point is carried out to multichannel bit sequence, the OFDM based on three-dimensional mapping is obtained OFDM symbol;
Three-dimensional inverse Fourier transform is carried out to the OFDM symbol, the time-domain signal of three-dimensional ofdm system, described three is obtained The time-domain signal for tieing up ofdm system is plural form;
The time-domain signal of the three-dimensional ofdm system is decomposed into real and imaginary parts, passes through three-dimensional carrierless amplitude phase CAP orthogonal filters carry out the time domain superposition of real and imaginary parts respectively;
Real and imaginary parts after superposition are combined as complex signal, the three-dimensional-carrierless amplitude phase sent- OFDM 3D-CAP-OFDM time-domain signals;
Transmission Data Concurrent is obtained by the 3D-CAP-OFDM time-domain signals and send the transmission data.
Optionally, it is described that three-dimensional inverse Fourier transform is carried out to the OFDM symbol, specifically include:
Row and column both direction to the OFDM symbol along matrix carries out once two-dimentional inverse Fourier transform respectively, real The existing three-dimensional inverse Fourier transform.
Optionally, it is described that data to be transmitted is obtained by the 3D-CAP-OFDM time-domain signals, specifically include:
By the 3D-CAP-OFDM time-domain signals by adding synchronous training sequence, channel estimation training sequence and following Ring prefix, to obtain time-domain signal to be sent, the time-domain signal to be sent is plural form;
The time-domain signal to be sent is decomposed into real and imaginary parts, distinguished using the three-dimensional CAP orthogonal filters Three components of real and imaginary parts are modulated, the signal after modulation is the data to be transmitted.
Second aspect, the embodiment of the present invention provides a kind of three-dimensional orthogonal frequency division multiplexed data demodulation method, including:
Transmission data are received by balanced detector, the transmission data are specially:To three-dimensional orthogonal frequency division multiplex OFDM The time-domain signal of system carries out the data obtained after three-dimensional carrierless amplitude phase CAP modulation;
Baseband signal is obtained by the transmission data;
The baseband signal is handled, the OFDM symbol based on three-dimensional mapping is obtained;
Three-dimensional reverse Mapping is carried out to the OFDM symbol based on three-dimensional mapping, to obtain the bit of the transmission data Sequence.
Optionally, it is described that the baseband signal is handled, obtain the OFDM symbol based on three-dimensional mapping, specific bag Include:
The baseband signal is estimated by offset estimation and phase noise, to obtain the data by correction;
Carry out solving CAP operations by the data corrected by described, detailed process is by obtaining CAP three-dimensional orthogonal wave filters Reverse response obtain the real and imaginary parts component of three dimensions, and obtain three-dimensional orthogonal frequency division multiplexing time-domain signal;
The data passed through after solution CAP is operated are subjected to three-dimensional OFDM demodulation, and then three-dimensional is based on described in acquisition The OFDM symbol of mapping.
The present invention has the beneficial effect that:
In embodiments of the present invention there is provided a kind of data modulation method for being different from conventional OFDM systems, including:To many Road bit sequence carries out three-dimensional data constellation point, obtains the orthogonal frequency division multiplex OFDM symbol based on three-dimensional mapping;It is right OFDM symbol carries out three-dimensional inverse Fourier transform, obtains the time-domain signal of three-dimensional ofdm system, the time domain letter of three-dimensional ofdm system Number it is plural form;The time-domain signal of three-dimensional ofdm system is decomposed into real and imaginary parts, passes through three-dimensional carrierless amplitude phase CAP orthogonal filters carry out the time domain superposition of real and imaginary parts respectively;Real and imaginary parts after superposition are combined as plural number Signal, the three-dimensional-carrierless amplitude phase sent-OFDM 3D-CAP-OFDM time-domain signals;Pass through 3D- CAP-OFDM time-domain signals obtain transmission Data Concurrent and send transmission data.Because in three-dimensional data mapping, three-dimensional constellation point is divided Cloth is symmetric on 16 summits of the inscribe square of two spheroids, so on the premise of power normalization, it is three-dimensional The minimum euclidean distance of constellation point is higher by 8.7% than two dimension, while being 10 in probability-3When, obtained PAPR will than two dimension Low 7dB, so as to reach reduction PAPR technique effect;Due in systems, having used three-dimensional CAP wave filters to realize three The transmission of dimension, therefore, compared to conventional OFDM systems, time efficiency is not reduced, so reached in not influence time While efficiency, PAPR technique effect is reduced;
Further, because the constellation point structure of three-dimensional mapping can obtain more much lower than common two constellation points Peak-to-average power ratio and bigger minimum Eustachian distance, so three-dimensional CAP systems can lift bit error rate performance simultaneously and non-linear The tolerance of effect, is compared with traditional two-dimentional system, and three-dimensional CAP systems are improved probably in terms of non-linear tolerance 3dB, and bit error rate performance then improves about 3.3dB;
Also, the program is fairly simple in the Digital Signal Processing of transmitting terminal and receiving terminal, it is not necessary to extra expense.
Brief description of the drawings
Fig. 1 is the flow chart of three-dimensional orthogonal frequency division multiplexed data modulator approach in the embodiment of the present invention;
Fig. 2 a are three-dimensional constellation point schematic diagram in data transmission method of the embodiment of the present invention;
Fig. 2 b are the schematic diagram of two dimensional constellation point in the prior art;
Fig. 3 be three-dimensional orthogonal frequency division multiplexed data modulator approach of the embodiment of the present invention in pass through three-dimensional CAP-OFDM systems Time-domain signal obtains data to be transmitted and sends the flow chart of data to be transmitted;
Fig. 4 is the flow chart of the three-dimensional orthogonal frequency division multiplexed data demodulation method of second aspect of the embodiment of the present invention;
Fig. 5 is non-for the coherent communication system of the coherent communication system in the embodiment of the present invention based on three-dimensional CAP and two dimension The comparison schematic diagram of linear tolerance;
Fig. 6 is the mistake of coherent communication system and the coherent communication system of two dimension based on three-dimensional CAP in the embodiment of the present invention The comparison schematic diagram of code check performance;
Fig. 7 illustrates three-dimensional mapping and comparison schematic diagram of the two-dimensional map in terms of peak-to-average power ratio PAPR.
Embodiment
The present invention provides a kind of data transmission method, data receiver method, to solve to ensure not in the prior art In the case of influence system other performance, while reducing PAPR technical problem.
Technical scheme in the embodiment of the present application is solves above-mentioned technical problem, and general thought is as follows:
There is provided a kind of data modulation method for being different from conventional OFDM systems, including:Three are carried out to multichannel bit sequence Dimension data constellation point, obtains the orthogonal frequency division multiplex OFDM symbol based on three-dimensional mapping;Three-dimensional Fu is carried out to OFDM symbol In leaf inverse transformation, obtain the time-domain signal of three-dimensional ofdm system, the time-domain signal of three-dimensional ofdm system is plural form;By three-dimensional The time-domain signal of ofdm system is decomposed into real and imaginary parts, is entered respectively by three-dimensional carrierless amplitude phase CAP orthogonal filters The time domain superposition of row real and imaginary parts;Real and imaginary parts after superposition are combined as complex signal, the three-dimensional sent- Carrierless amplitude phase-OFDM 3D-CAP-OFDM time-domain signals;Obtained and passed by 3D-CAP-OFDM time-domain signals Transmission of data simultaneously sends transmission data.Because in three-dimensional data mapping, the inscribe that three-dimensional constellation point is distributed in two spheroids is square On 16 summits of body, it is symmetric, so on the premise of power normalization, the minimum euclidean distance ratio of three-dimensional constellation point Two-dimentional wants high by 8.7%, while being 10 in probability-3When, obtained PAPR is than two-dimentional low 7dB, so as to reach reduction PAPR technique effect;
Further, because the constellation point structure of three-dimensional mapping can obtain more much lower than common two constellation points Peak-to-average power ratio and bigger minimum Eustachian distance, so three dimension system can lift bit error rate performance and nonlinear effect simultaneously Tolerance, compared with traditional two-dimentional system, three-dimensional CAP-OFDM systems are improved probably in terms of non-linear tolerance 3dB, and bit error rate performance then improves about 3.3dB;
Also, the program is fairly simple in the Digital Signal Processing of transmitting terminal, it is not necessary to extra expense, it is not required that will High-power point in useful signal is reamed, and then ensures that useful signal will not be lost.
In order to be better understood from above-mentioned technical proposal, below by accompanying drawing and specific embodiment to technical solution of the present invention It is described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the detailed of technical solution of the present invention Thin explanation, rather than the restriction to technical solution of the present invention, in the case where not conflicting, the embodiment of the present invention and embodiment In technical characteristic can be mutually combined.
In a first aspect, the embodiment of the present invention, which provides a kind of part, is different from traditional OFDM data transmission method, figure refer to 1, including:
Step S101:Three-dimensional data constellation point is carried out to multichannel bit sequence, obtained based on the orthogonal of three-dimensional mapping Frequency division multiplex OFDM symbol;
Step S102:Three-dimensional inverse Fourier transform is carried out to OFDM symbol, the time-domain signal of three-dimensional ofdm system, three is obtained The time-domain signal for tieing up ofdm system is plural form;
Step S103:The time-domain signal of three-dimensional ofdm system is decomposed into real and imaginary parts, passes through three-dimensional carrierless amplitude Phase CAP orthogonal filters carry out the time domain superposition of real and imaginary parts respectively;
Step S104:Real and imaginary parts after superposition are combined as complex signal, the three-dimensional-carrierfree sent Amplitude-phase-OFDM 3D-CAP-OFDM time-domain signals;
Step S105:Transmission Data Concurrent is obtained by 3D-CAP-OFDM time-domain signals and send transmission data.
In step S101, the data for needing to send are obtained first, the data for needing to send then are converted into pseudorandom sequence Row, finally carry out serioparallel exchange, it becomes possible to obtain multichannel bit sequence by pseudo-random sequence.
Fig. 2 a are refer to, are the schematic diagram of three-dimensional mapping in the embodiment of the present invention, the constellation point of three-dimensional mapping is generally by Ax+ By+Cz is represented, can define one constellation point of every 4 bit correspondence, such as 0001 constellation point S1 so can be achieved with constellation Point have mapped, if initial data is comprising N*4 bit, then after three-dimensional constellation mapping, N*3 bit of acquisition OFDM symbol.
And be the schematic diagram of the constellation point of two-dimensional map of the prior art as shown in Figure 2 b, it is generally the case that it is two-dimentional Constellation point is represented on two dimensional surface with I+jQ, is contrasted from Fig. 2 a and Fig. 2 b, and three-dimensional constellation point is distributed in two spheroids Inscribe square 16 summits on, be symmetric, this distribution as a result, on the premise of power normalization, three The minimum euclidean distance for tieing up constellation point is higher by 8.7% than two dimension, while being 10 in probability-3When, obtained peak-to-average power ratio two Dimension will low 7dB.
In specific implementation process, after three-dimensional data constellation point is carried out to multichannel bit sequence, method is also wrapped Include:OFDM symbol is mapped on carrier wave, specifically, that is, by the relevant position of OFDM symbol filled matrix, and then N*3 matrix is obtained, in this step 3D-IDFT (3D Inverse Discrete Fourier Transform:It is three-dimensional from Dissipate inverse Fourier transform) the total carrier number of points (namely N value) correspondence.
In step S102, three-dimensional inverse Fourier transform is carried out to OFDM symbol, is specifically included:To OFDM symbol (OFDM Symbol is actually a two-dimensional matrix) two-dimentional Fourier's inversion is carried out once respectively along the row and column both direction of matrix Change, realize three-dimensional inverse Fourier transform.
2D-IDFT (2D Inverse Discrete Fourier Transform twice are carried out to OFDM symbol:Two dimension Inverse discrete Fourier transform) algorithmically it is easier to realize, so 3D-IDFT can quickly be realized by the program.
In step S105, transmission Data Concurrent is obtained by 3D-CAP-OFDM time-domain signals and send transmission data, figure is refer to 3, including:
Step S301:By 3D-CAP-OFDM time-domain signals by add synchronous training sequence, channel estimation training sequence with And cyclic prefix, to obtain time-domain signal to be sent, time-domain signal to be sent is plural form;
Step S302:Time-domain signal to be sent is decomposed into real and imaginary parts, distinguished using three-dimensional CAP orthogonal filters Three components of real and imaginary parts are modulated, the signal after modulation is transmission data.
In step S301, the purpose for adding synchronous training sequence is to realize frame synchronization, and synchronizing sequence is using Schimdl's Classical way, difference is that synchronization employs three synchronous heads, and corresponding three synchronizing sequences are a 3D-OFDM symbols Number, the position of first synchronous head is the frame stem that we need to find in three synchronous heads;
And the purpose for adding channel estimation training sequence is that receiving terminal can be estimated channel transfer characteristic, with estimating The characteristic of channel of meter out carries out channel equalization to receiving data, wherein, channel estimation can use the channel estimation side of frequency domain Formula.
The length of cyclic prefix is set to 0.1 times of total carrier wavelength, and CP addition can suppress in optical fiber dispersion to being The influence of system.
In step S302, because each symbol of time-domain signal to be sent is still N*3 complex matrix, this is answered Matrix number is divided into real and imaginary parts, obtains real number N*3 matrixes and imaginary number N*3 matrixes, to three column vectors of real number N*3 matrixes, Respectively by designed three-dimensional CAP orthogonal filters, and it is overlapped, obtains real number matrix N*1;Similarly, to imaginary number Matrix N * 3 does same processing, obtains imaginary number matrix N * 1, obtained real number imaginary number matrix is recombinated, the number after restructuring According to being exactly to transmit data.
After transmission data are obtained, by the modulation of I/Q modulator, then it can just be transmitted by fibre-optic transmission system (FOTS) To receiver, and then complete the transmitting procedure of whole data.
In three dimension system, due to Ax+By+Cz data structure so that its time-domain signal is actually three groups of plural numbers Signal, if with three IQ (in-phase quadrature:Inphase quadrature) modulator is modulated, then can cause cost too Height, thus we using three-dimensional CAP orthogonal filters modulation by the way of, three plural numbers are staggered in time domain, can thus be used One I/Q modulator realizes modulation, and can be reached by the program reduces the technique effect of cost.
In addition, when being transmitted by fibre-optic transmission system (FOTS) to transmission data, can be sent out by three timeslices Send, x-axis coordinate set, y-axis coordinate set and z-axis coordinate set in three timeslice difference corresponding A x+By+Cz data structure Close.
Second aspect, based on same inventive concept, the embodiment of the present invention provides a kind of three-dimensional orthogonal of and transmitting terminal contrary Frequency division multiplexed data demodulation method, this method is used for the three-dimensional orthogonal frequency division multiplexing number for receiving first aspect of the embodiment of the present invention According to the transmission data transmitted by modulator approach, Fig. 4 is refer to, is comprised the following steps:
Step S401:Transmission data are received by balanced detector, transmission data are specially:To three-dimensional orthogonal frequency division multiplexing The time-domain signal of ofdm system carries out the data obtained after three-dimensional carrierless amplitude phase CAP modulation;
Step S402:Baseband signal is obtained by data to be transmitted;
Step S403:Baseband signal is handled, the OFDM symbol based on three-dimensional mapping is obtained;
Step S404:Three-dimensional reverse Mapping is carried out to the OFDM symbol based on three-dimensional mapping, to obtain the ratio of transmission data Special sequence.
In step S401, at balanced detector end, there is a laser roughly the same with transmitting terminal laser, say here Roughly the same is because can not possibly have the laser of complete striking resemblances, with the local oscillator laser and the light of reception of this receiving terminal Signal is coupled, then by the coupling of multichannel, then by the detection of No. 4 semiconductor detectors, then by calculus of differences, just It can be come out three road Signal separators are transmitted by three timeslices in transmission data.
In step S402, by balanced detector after optical fiber obtains data to be transmitted, by ADC (Analog- to-Digital Converter:Analog-digital converter) analog-to-digital conversion is carried out, data signal is obtained, can be obtained by down-sampling Baseband signal.
As further preferred embodiment, baseband signal is handled in step S403, obtained based on three-dimensional mapping OFDM symbol, specifically include:
Baseband signal is estimated by offset estimation and phase noise, to obtain the data by correction;
Solution CAP operations will be carried out by the data corrected, detailed process is by obtaining the inverse of CAP three-dimensional orthogonal wave filters Respond to obtain the real and imaginary parts component of three dimensions, and obtain three-dimensional orthogonal frequency division multiplexing time-domain signal;
Data after solution CAP operations are subjected to three-dimensional OFDM demodulation, and then obtained based on three-dimensional mapping OFDM symbol.
Because the laser of local concussion laser and transmitting terminal can not possibly be completely the same, in general there can be frequency inclined Difference and line width, frequency departure refers to that the centre wavelength of two lasers is inconsistent, and line width refers to that laser in itself can not It can be a pulsed light, but have certain broadening;Therefore the correction of frequency departure can be realized with frequency excursion algorithm, and phase Position noise estimation is then that, in order to suppress the interference of line width, such processing is provided to make it that the signal of demodulation is as correct as possible.
Three-dimensional OFDM demodulation will be carried out by the data corrected, comprised the following steps:1. it is synchronous, it can be obtained after synchronization To the structure of frame;2. serioparallel exchange is carried out;3. cyclic prefix is removed;4. 3D-DFT (3D Discrete Fourier are carried out Transform:3 d-dem Fourier transformation), can be by the 5. parallel-serial conversions of 2D-DFT twice, this makes it possible to be based on The OFDM symbol of three-dimensional mapping.
In step S404, inverse mapping refers to the constellation point of demodulation being mapped exactly on bit sequence, wherein, demodulate and Three-dimensional constellation point be discrete point, and the point actually launched should be 16 points in Fig. 2 a, so we need to judge It is which of transmitting point which point is corresponding in the point of demodulation, and the mode of judgement is exactly which is put from mathematical point recently, is just recognized These fixed points correspond to this mathematical point, and we know in advance due to the corresponding bit sequence of this mathematical point, thus real Inverse mapping is showed.
Below, will be excellent relative to two dimensional constellation point of the prior art to compare the scheme of the application based on several groups of data Gesture:
Fig. 5 illustrates the coherent communication system of non-linear tolerance 50 and two dimension based on three-dimensional coherent communication system The comparison of non-linear tolerance 51, it can be appreciated that compared with traditional two-dimentional system, three dimension system is in non-linear tolerance General 3dB is improved in terms of degree.
Fig. 6 illustrates the mistake of the bit error rate performance 60 based on three-dimensional coherent communication system and the coherent communication system of two dimension The comparison of code check performance 61, it can be appreciated that compared with traditional two-dimentional system, the bit error rate performance of three dimension system is then carried About 3.3dB is risen.
Fig. 7 illustrates the comparison in terms of the peak-to-average power ratio PAPR70 of the three-dimensional mapping and PAPR71 of two-dimensional map, CCDF (Complementary Cumulative Distribution Function:Complementary Cumulative Distribution Function) description be exactly Under certain probability, the numerical value that PAPR can reach, it can be seen that when CCDF is 10-3When, the PAPR of distributed in three dimensions is than Two dimensional Distribution Few 7dB.
The one or more embodiments of the present invention, at least have the advantages that:
There is provided a kind of data modulation method for being different from conventional OFDM systems, including:Three are carried out to multichannel bit sequence Dimension data constellation point, obtains the orthogonal frequency division multiplex OFDM symbol based on three-dimensional mapping;Three-dimensional Fu is carried out to OFDM symbol In leaf inverse transformation, obtain the time-domain signal of three-dimensional ofdm system, the time-domain signal of three-dimensional ofdm system is plural form;By three-dimensional The time-domain signal of ofdm system is decomposed into real and imaginary parts, is entered respectively by three-dimensional carrierless amplitude phase CAP orthogonal filters The time domain superposition of row real and imaginary parts;Real and imaginary parts after superposition are combined as complex signal, the three-dimensional sent- Carrierless amplitude phase-OFDM 3D-CAP-OFDM time-domain signals;Obtained and passed by 3D-CAP-OFDM time-domain signals Transmission of data simultaneously sends transmission data.Because in three-dimensional data mapping, the inscribe that three-dimensional constellation point is distributed in two spheroids is square On 16 summits of body, it is symmetric, so on the premise of power normalization, the minimum euclidean distance ratio of three-dimensional constellation point Two-dimentional wants high by 8.7%, while being 10 in probability-3When, obtained PAPR is than two-dimentional low 7dB, so as to reach reduction PAPR technique effect;
Further, because the constellation point structure of three-dimensional mapping can obtain more much lower than common two constellation points Peak-to-average power ratio and bigger minimum Eustachian distance, so three dimension system can lift bit error rate performance and nonlinear effect simultaneously Tolerance, compared with traditional two-dimentional system, three dimension system improves general 3dB in terms of non-linear tolerance, and misses Code check performance then improves about 3.3dB;
Also, the program is fairly simple in the Digital Signal Processing of transmitting terminal, it is not necessary to extra expense, it is not required that will High-power point in useful signal is reamed, and then ensures that useful signal will not be lost.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to comprising including these changes and modification.

Claims (2)

1. a kind of three-dimensional orthogonal frequency division multiplexed data modulator approach, it is characterised in that including:
Three-dimensional data constellation point is carried out to multichannel bit sequence, the orthogonal frequency division multiplex OFDM symbol based on three-dimensional mapping is obtained Number;
Three-dimensional inverse Fourier transform is carried out to the OFDM symbol, the time-domain signal of three-dimensional ofdm system, the three-dimensional is obtained The time-domain signal of ofdm system is plural form;
The time-domain signal of the three-dimensional ofdm system is decomposed into real and imaginary parts, by three-dimensional carrierless amplitude phase CAP just Wave filter is handed over to carry out the time domain superposition of real and imaginary parts respectively;
Real and imaginary parts after superposition are combined as complex signal, the three-dimensional-carrierless amplitude phase sent-orthogonal Frequency division multiplexing 3D-CAP-OFDM time-domain signals;
By the 3D-CAP-OFDM time-domain signals by adding before synchronous training sequence, channel estimation training sequence and circulation Sew, to obtain time-domain signal to be sent, the time-domain signal to be sent is plural form;
The time-domain signal to be sent is decomposed into real and imaginary parts, using the three-dimensional CAP orthogonal filters respectively to reality Three components of portion and imaginary part are modulated, and the signal after modulation is transmission data.
2. the method as described in claim 1, it is characterised in that described that three-dimensional Fourier's inversion is carried out to the OFDM symbol Change, specifically include:
Row and column both direction to the OFDM symbol along matrix carries out once two-dimentional inverse Fourier transform respectively, realizes institute State three-dimensional inverse Fourier transform.
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