CN107294892A - Signal transmitting apparatus, method and filter bank multi-carrier system - Google Patents
Signal transmitting apparatus, method and filter bank multi-carrier system Download PDFInfo
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- CN107294892A CN107294892A CN201610196912.XA CN201610196912A CN107294892A CN 107294892 A CN107294892 A CN 107294892A CN 201610196912 A CN201610196912 A CN 201610196912A CN 107294892 A CN107294892 A CN 107294892A
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/264—Pulse-shaped multi-carrier, i.e. not using rectangular window
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
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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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
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Abstract
The embodiment of the present invention provides a kind of signal transmitting apparatus, method and filter bank multi-carrier system.The method for transmitting signals includes：The symbol to be transmitted that multiple classes are divided into according to sequence number is modulated, and the modulation symbol on each subcarrier is complex values；Wherein inhomogeneous symbol to be transmitted is modulated by using the constellation point of different amplitudes；Symbol after modulation is carried out to be superimposed after spread spectrum and inverse Fourier transform, multicarrier symbol is formed and sends.Thus, the problem of filter bank multi-carrier system application is limited can be not only solved, and the transmission performance of system can be improved.
Description
Technical field
The present embodiments relate to multi-carrier communication technical field, more particularly to a kind of signal transmitting apparatus, method and
Filter bank multi-carrier (FBMC, Filter-Bank MultiCarrier) system.
Background technology
FBMC has than OFDM (OFDM, Orthogonal Frequency Division
Multiplexing) lower power density spectrum secondary lobe.But FBMC can only be combined with the modulation technique of real value or dummy values,
Such as pulse amplitude modulation (PAM, pulse amplitude modulation) or difference quadrature amplitude modulation(PAM) (OQAM,
offset Quadrature Amplitude Modulation)；Because FBMC is only orthogonal in real number field or imaginary number domain, multiple
Non-orthogonal in number field, this characteristic make it that FBMC application is limited to.
Such as FBMC channel estimation is especially complex under multidiameter fading channel environment, because channel response always complex values
, this causes to interfere between data and pilot tone.Such as FBMC and multiple-input and multiple-output (MIMO, Multiple again
Input Multiple Output) when combining also be not as convenient as OFDM because OFDM is done between antenna is only existed under fading channel
Disturb, and FBMC does not only exist inter-antenna interference also comprising the interference between subcarrier.
Therefore, the problem of there is limited application and not high enough transmission performance in current FBMC systems.
It should be noted that the introduction of technical background is intended merely to above it is convenient technical scheme is carried out it is clear,
Complete explanation, and facilitate the understanding of those skilled in the art and illustrate.Can not be merely because these schemes be the present invention's
Background section is set forth and thinks that above-mentioned technical proposal is known to those skilled in the art.
The content of the invention
The embodiments of the invention provide a kind of signal transmitting apparatus, method and filter bank multi-carrier system.Solve
The problem of application of FBMC systems is limited and the transmission performance for improving system.
One side according to embodiments of the present invention is configured at filter bank multi-carrier there is provided a kind of signal transmitting apparatus
Wave system is united, and the signal transmitting apparatus includes：
Modulating unit, it is modulated to the symbol to be transmitted that multiple classes are divided into according to sequence number, and is carried per height
Modulation symbol on ripple is complex values；The wherein inhomogeneous symbol to be transmitted is adjusted by using the constellation point of different amplitudes
System；
Spectrum-spreading unit, it is spread the symbol after modulation；
Converter unit, the symbol after spread spectrum is carried out inverse Fourier transform by it；
Superpositing unit, the symbol after inverse Fourier transform is overlapped by it, forms multicarrier symbol；And
Transmitting element, it sends the multicarrier symbol.
Second aspect according to embodiments of the present invention is configured at filter bank multi-carrier there is provided a kind of signal transmitting apparatus
Wave system is united, and the signal transmitting apparatus includes：
Receiving unit, it receives the multicarrier symbol that multiple classes are divided into according to sequence number；It is wherein inhomogeneous described many
Symbols are modulated by using the constellation point of different amplitudes；
Converter unit, the multicarrier symbol is carried out Fourier transformation by it；
Unit is despread, it is despread the symbol carried out after Fourier transformation；And
Demodulating unit, it is demodulated successively according to the size of constellation point amplitude to all kinds of symbols；Wherein first demodulate constellation
The larger class symbol of point amplitude, the less another kind of symbol of re-demodulation constellation point amplitude.
There is provided a kind of filter bank multi-carrier system, the wave filter group for 3rd aspect according to embodiments of the present invention
Multicarrier system includes：
Transmitting terminal, it is modulated to the symbol to be transmitted that multiple classes are divided into according to sequence number, and each subcarrier
On modulation symbol be complex values；The wherein inhomogeneous symbol to be transmitted is adjusted by using the constellation point of different amplitudes
System；It is overlapped after symbol after modulation is carried out into spread spectrum and inverse Fourier transform, forms multicarrier symbol and send；
Receiving terminal, it receives the multicarrier symbol that multiple classes are divided into according to sequence number；The multicarrier symbol is carried out
Fourier transformation and despread；And all kinds of symbols are demodulated successively according to the size of constellation point amplitude.
The beneficial effect of the embodiment of the present invention is：Transmitting terminal uses inhomogeneous symbol to be transmitted the star of different amplitudes
Seat point is modulated, and receiving terminal is demodulated successively according to the size of constellation point amplitude to all kinds of symbols；Thus, each subcarrier
On modulation symbol can be complex values；The problem of application of FBMC systems is limited can be not only solved, and system can be improved
Transmission performance.
With reference to explanation hereinafter and accompanying drawing, the particular implementation of the embodiment of the present invention is disclose in detail, this hair is specified
The principle of bright embodiment can be in adopted mode.It should be understood that embodiments of the present invention in scope not thus by
Limitation.In the range of the spirit and terms of appended claims, embodiments of the present invention include many changes, modifications and waited
Together.
The feature for describing and/or showing for a kind of embodiment can be in same or similar mode one or more
Used in individual other embodiment, it is combined with feature in other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when being used herein, but simultaneously
It is not excluded for the presence or additional of one or more further features, one integral piece, step or component.
Brief description of the drawings
Included accompanying drawing is used for providing being further understood from the embodiment of the present invention, which constitutes one of specification
Point, for illustrating embodiments of the present invention, and the principle for the explaination present invention that comes together with word description.It should be evident that under
Accompanying drawing in the description of face is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying wound
On the premise of the property made is laborious, other accompanying drawings can also be obtained according to these accompanying drawings.In the accompanying drawings：
Fig. 1 is the schematic diagram of the signal transmitting apparatus of the embodiment of the present invention 1；
Fig. 2 is the schematic diagram of the constellation point of the embodiment of the present invention 1；
Fig. 3 is the schematic diagram of the weighting spread spectrum of the embodiment of the present invention 1；
Fig. 4 is another schematic diagram of the weighting spread spectrum of the embodiment of the present invention 1；
Fig. 5 is the schematic diagram of the symbol superposition of the embodiment of the present invention 1；
Fig. 6 is the schematic diagram of the signal transmitting apparatus of the embodiment of the present invention 2；
Fig. 7 is the schematic diagram of the method for transmitting signals of the embodiment of the present invention 3；
Fig. 8 is the schematic diagram of the method for transmitting signals of the embodiment of the present invention 4；
Fig. 9 is the schematic diagram of the FBMC systems of the embodiment of the present invention 5；
Figure 10 is the schematic diagram of the emittor/receiver of the embodiment of the present invention 5.
Embodiment
Referring to the drawings, by following specification, the foregoing and further feature of the embodiment of the present invention will be apparent.
In specification and drawings, only certain exemplary embodiments of this invention is specifically disclosed, which show wherein can be using present invention implementation
The some embodiments of the principle of example, it will thus be appreciated that the invention is not restricted to described embodiment, on the contrary, the present invention is real
Apply whole modifications, modification and equivalent that example includes falling within the scope of the appended claims.
Embodiment 1
The embodiment of the present invention provides a kind of signal transmitting apparatus, is configured at FBMC systems, and the embodiment of the present invention is from transmitting terminal
Illustrate.
Fig. 1 is the schematic diagram of the signal transmitting apparatus of the embodiment of the present invention, as shown in figure 1, signal transmitting apparatus 100 is wrapped
Include：
Modulating unit 101, it is modulated to the symbol to be transmitted that multiple classes are divided into according to sequence number, and per height
Modulation symbol on carrier wave is complex values；Wherein inhomogeneous symbol to be transmitted is adjusted by using the constellation point of different amplitudes
System；
Spectrum-spreading unit 102, it is spread the symbol after modulation；
Converter unit 103, the symbol after spread spectrum is carried out inverse Fourier transform (such as IFFT, Inverse Fast by it
Fourier Transform)；
Superpositing unit 104, the symbol after IFFT is overlapped by it, forms multicarrier symbol；And
Transmitting element 105, it sends multicarrier symbol.
It is worth noting that, Fig. 1 only diagrammatically illustrates some parts related to the present invention or module, but the present invention is not
Be limited to this, such as signal transacting the need for can also include the parts that be not shown of Fig. 1 or module.
In the present embodiment, symbol to be transmitted can be divided into multiple classes in advance according to sequence number.For example, can be according to sequence
Number be divided into the symbol to be transmitted formation first kind (odd number class) of two classes, wherein serial number odd number, serial number even number it is to be passed
Defeated symbol formation Equations of The Second Kind (even number class).
For another example three classes, wherein serial number Isosorbide-5-Nitrae can be divided into according to sequence number, 7 ... ... symbol to be transmitted is formed
The first kind, the symbol to be transmitted formation Equations of The Second Kind of serial number 2,5,8 ... ..., the symbol shape to be transmitted of serial number 3,6,9 ... ...
Into the 3rd class.
But the invention is not restricted to this, for example, it can also be divided into more classes.
In the present embodiment, the continuous symbol to be transmitted of any two may belong to different classes, for example as above example institute
Show.Thus, continuous symbol is divided into different classes, advantageously reduces intersymbol interference, improves transmission performance.But this hair
Bright not limited to this, for example, can also constitute the symbol in a unit, same unit by continuous n symbol and belong to same class, and
Continuous two units belong to different classes.
In the present embodiment, symbol can be classified based on over-sampling rate K.For example, symbol to be transmitted is based on { (n-
1) mod K } K classes are divided into, n is the sequence number of symbol to be transmitted.For example in the case where K is 2, odd number as described above is formed
Class and even number class.
In the present embodiment, the constellation point of different amplitudes meets following condition：
Wherein, dkRepresent constellation point, akThe amplitude of constellation point is represented, θ represents the phase of constellation point；K is over-sampling rate, and k is
Positive integer more than or equal to 1 and less than or equal to K.
Wherein, kth class symbol to be transmitted is by using constellation point dkModulated.
Below for the ease of statement, adjusted with QPSK (QPSK, Quadrature Phase Shift Keying)
Illustrated exemplified by system and K=2；That is, odd number class symbol and even number class symbol are adjusted respectively using two classes, 4 yuan of constellation points
System.But the invention is not restricted to this, it is more than 2 for K and uses the feelings of other constellation points (such as 4QAM, 16QAM, 64QAM)
Condition, can similarly be handled.
In the present embodiment, in the case where using 4 yuan of constellation points,
That is, quaternary modulation constellation points can be expressed as：
In the case of K=2 and using 4 yuan of constellation points, the constellation points of different amplitudes can include the first constellation point and the
Two constellation points, can be expressed as：
Wherein, j is defined asAnd assume
Such first constellation point d1Amplitude be more than the second constellation point d2Amplitude.
Fig. 2 is the schematic diagram of the constellation point of the embodiment of the present invention, as shown in Fig. 2 the first constellation point d1Amplitude
More than the amplitude (being 1) of conventional constellation point, the second constellation point d2AmplitudeLess than the amplitude of conventional constellation point.
In the present embodiment, in symbol to be transmitted the symbol (odd number class symbol) of serial number odd number by using the first constellation
Point (d1) modulated, the symbol (even number class symbol) of serial number even number is by using the second constellation point (d in symbol to be transmitted2) quilt
Modulation.
Unlike the prior art, the embodiment of the present invention need not convert symbol to pure imaginary number or purely real, often
Modulation symbol on individual subcarrier can be complex values, and thus FBMC systematic differences are no longer limited, and can improve system
Transmission performance.
Schematically illustrated below for spread spectrum, IFFT and superposition.
Fig. 3 is the schematic diagram of the weighting spread spectrum of the embodiment of the present invention；Fig. 4 is the another of the weighting spread spectrum of the embodiment of the present invention
Schematic diagram；Fig. 5 is the schematic diagram of the symbol superposition of the embodiment of the present invention, is shown a case that by taking odd bits and even bit as an example.
Wherein, K is over-sampling rate (such as K=4), and N is total number of subchannels, and IFFT size is N*K；Per sub-channels
Modulate 2*K-1 subcarrier.
In the present embodiment, spreading code is the frequency response of the ptototype filter per sub-channels, can be expressed as：
c(2K-1)×1=[HK-1 ... H1 H0 H1 ... HK-1]T
These above-mentioned values are the values for meeting Nyquist criterion, and such as some usable levels are as follows：
Table 1
The joint spreading code matrix of odd bits subchannel can be：
The spreading code matrix of even sub-channels can be：
The signal carried on each subcarrier after spread spectrum can be：
Codd·dodd(n)+Ceven·deven(n)
Wherein, dodd(n) it is defined as：
[d1(n) d3(n) ... dN-1(n)]T；
deven(n) it is defined as：
[d2(n) d4(n) ... dN(n)]T；
N is the sequence number of symbol, n=1,2,3 ....N counts for IFFT/FFT, it is assumed that be even number.
If odd and even number subchannel combined, it can be written as
C·d(n)
Wherein, C is defined as：
D (n) is defined as：
[d1(n) d2(n) ... dN(n)]T
After by IFFT, n-th of multicarrier symbol is：
X (n)=IDFTCd (n)=IDFT (Codd·dodd(n)+Ceven·deven(n))。
Wherein, IDFT is that can may be referred to correlation technique with predetermined matrix parameter.
Have 2K-1 symbol to be added in time domain, the signal of superposition can be designated as x ' (n), due to Nyquist criterion,
The intersymbol interference in real number field can't be caused in receiving terminal, but is the presence of interference in complex field, the embodiment of the present invention exists
Receiving terminal can eliminate this interference.
From above-described embodiment, transmitting terminal is adjusted to inhomogeneous symbol to be transmitted using the constellation point of different amplitudes
System, receiving terminal is demodulated successively according to the size of constellation point amplitude to all kinds of symbols；Thus, the modulation symbol on each subcarrier
Number can be complex values；The problem of application of FBMC systems is limited can be not only solved, and the transmission performance of system can be improved.
Embodiment 2
The embodiment of the present invention provides a kind of signal transmitting apparatus, is configured at FBMC systems；The embodiment of the present invention is from receiving terminal
Illustrate, content same as Example 1 is repeated no more.
Fig. 6 is the schematic diagram of the signal transmitting apparatus of the embodiment of the present invention, as shown in fig. 6, signal transmitting apparatus 600 is wrapped
Include：
Receiving unit 601, it receives the multicarrier symbol that multiple classes are divided into according to sequence number；Wherein inhomogeneous overloading
Ripple symbol is modulated by using the constellation point of different amplitudes；
Converter unit 602, multicarrier symbol is carried out Fourier transformation by it；
Unit 603 is despread, it is despread the symbol carried out after Fourier transformation (such as FFT)；And
Demodulating unit 604, it is demodulated successively according to the size of constellation point amplitude to all kinds of symbols；Wherein first demodulate star
The larger class symbol of seat point amplitude, the less another kind of symbol of re-demodulation constellation point amplitude.
It is worth noting that, Fig. 6 only diagrammatically illustrates some parts related to the present invention or module, but the present invention is not
Be limited to this, such as signal transacting the need for can also include the parts that be not shown of Fig. 6 or module.
In the present embodiment, multicarrier symbol can be divided into K classes based on { (n-1) mod K }, and n is multicarrier symbol
Sequence number, K is over-sampling rate.Only illustrated below exemplified by being divided into odd number class and even number class, but the invention is not restricted to this.
In the present embodiment, under additive white Gaussian noise channel, the signal that receiving terminal is received can be expressed as：
Y (n)=x (n)+w (n), wherein w (n) are white noise part.
After by such as channel equalization, then by such as discrete Fourier transform (DFT, Discrete Fourier
Transform) and despread, the estimate of symbol can be expressed as：
Re () and Im () are the operation for taking real and imaginary parts respectively, and DFT is can be with predetermined matrix parameter, Ke Yican
Examine correlation technique.Then, signal enters demodulating unit 604.
In the present embodiment, demodulating unit 604 can first demodulate constellation point amplitude larger according to the size of constellation point amplitude
A class symbol, the less another kind of symbol of re-demodulation constellation point amplitude.Wherein, in the demodulation less symbol of constellation point amplitude
When, carry out interference elimination using the estimate for the symbol being demodulated.
So that symbol is divided into odd number class and even number class as an example, demodulating unit 606 can first detect odd number bit sign (because
The amplitude of constellation point is larger, and reliability is higher), even number bit sign is then detected again；Due to now there is estimating for odd number bit sign
Evaluation, can carry out Interference Cancellation during detection even number bit sign, subtract the interference of odd number bit sign.
That is, demodulating unit 604 can use equation below：
Wherein,DeMod () is demodulation function, and n is the sequence number of multicarrier symbol；Y (n) tables
Show reception signal, C and DFT represent predetermined matrix respectively, and odd represents odd number, and even represents even number.
Therefore, even if there is interference in complex field, due to inhomogeneous multicarrier symbol in transmitting terminal by using difference
The constellation point of amplitude is modulated, and receiving terminal can be demodulated according to constellation point amplitude, and the less signal of Amplitude Ratio is carried out
Interference is eliminated, so as to eliminate interference and improve systematic function.
In the present embodiment, the estimate of demodulated symbol can also be used, iteratively each symbol is demodulated, by
This can further improve performance.
That is, demodulating unit 604 can use equation below：
Wherein, r is iteration sequence number, is natural number, the bigger performance of value is better, but bigger, the gain of the bigger delay of value
It is gradually reduced.
In the present embodiment, can also be under fading channel conditions, it is considered to the influence of channel response matrix.
That is, demodulating unit 604 can use equation below：
Wherein, H (n)=diag (H1(n) H2(n) ... HNK(n)), diag () is diagonal matrix generating function, Hf(n)
For the domain channel response of f-th of subcarrier of n-th of multicarrier symbol, 1≤f≤NK, and H-1(n) inverse matrix for being H (n), N
For the number of subchannel.
Be illustrated above so that symbol is divided into odd number class and even number class as an example, but the invention is not restricted to this, symbol
Multiple classes more than 2 can also be divided into.K classes are for example divided into based on { (n-1) mod K }.
In this case, demodulating unit 604 can preferentially detect the symbol that { (n-1) mod K } is zero, then detect
{ (n-1) mod K } is 1 symbol；By that analogy, finally detection { (n-1) mod K } is K-1 symbol.Detect { (n-1) mod
K } when being k symbol, it is necessary to subtract serial number n+k-1, n+k-2 ..., n+1, n-1 ..., n-k-1, n-k+1 symbol it is dry
Disturb.
That is, demodulating unit 604 can use equation below：
From above-described embodiment, transmitting terminal is adjusted to inhomogeneous symbol to be transmitted using the constellation point of different amplitudes
System, receiving terminal is demodulated successively according to the size of constellation point amplitude to all kinds of symbols；Thus, the modulation symbol on each subcarrier
Number can be complex values；The problem of application of FBMC systems is limited can be not only solved, and the transmission performance of system can be improved.
Embodiment 3
The embodiment of the present invention provides a kind of signal transmitting apparatus, the transmitting terminal applied to FBMC systems；The embodiment of the present invention
Content same as Example 1 is repeated no more.
Fig. 7 is the schematic diagram of the method for transmitting signals of the embodiment of the present invention, as shown in fig. 7, the method for transmitting signals includes：
Step 701, the symbol to be transmitted that multiple classes are divided into according to sequence number is modulated, and on each subcarrier
Modulation symbol be complex values；Wherein inhomogeneous symbol to be transmitted is modulated by using the constellation point of different amplitudes；
Step 702, the symbol after modulation is spread；
Step 703, the symbol after spread spectrum is subjected to inverse Fourier transform；
Step 704, the symbol after inverse Fourier transform is overlapped, forms multicarrier symbol；And
Step 705, multicarrier symbol is sent.
In the present embodiment, the continuous symbol to be transmitted of any two may belong to different classes；But the invention is not restricted to
This.Symbol to be transmitted can be divided into K classes based on { (n-1) mod K }, and n is the sequence number of symbol to be transmitted.
In the present embodiment, the constellation point of different amplitudes meets following condition：
Wherein, dkRepresent constellation point, akThe amplitude of constellation point is represented, θ represents the phase of constellation point；K is over-sampling rate, and k is
Positive integer more than or equal to 1 and less than or equal to K.
And kth class symbol to be transmitted is by using constellation point dkModulated.
In one embodiment, the constellation point is 4 yuan of constellation points,
In the case of 4 yuan of constellation points of K=2 and use, the constellation point of different amplitudes includes the first constellation point and the second star
Seat point, can be expressed as：
In one embodiment, the symbol of serial number odd number can be by using the first constellation point quilt in symbol to be transmitted
The symbol of serial number even number can be modulated by using the second constellation point in modulation, symbol to be transmitted.
It is worth noting that, only symbolically the embodiment of the present invention is illustrated by Fig. 7, but the invention is not restricted to this.
The execution sequence between each step for example can be suitably adjusted, can additionally increase some other steps or reduction
Some steps therein.Those skilled in the art can carry out suitably modification according to the above, be not limited solely to above-mentioned
The record of accompanying drawing.
From above-described embodiment, transmitting terminal is adjusted to inhomogeneous symbol to be transmitted using the constellation point of different amplitudes
System, receiving terminal is demodulated successively according to the size of constellation point amplitude to all kinds of symbols；Thus, the modulation symbol on each subcarrier
Number can be complex values；The problem of application of FBMC systems is limited can be not only solved, and the transmission performance of system can be improved.
Embodiment 4
The embodiment of the present invention provides a kind of signal transmitting apparatus, the receiving terminal applied to FBMC systems；The embodiment of the present invention
Content same as Example 2 is repeated no more.
Fig. 8 is the schematic diagram of the method for transmitting signals of the embodiment of the present invention, as shown in figure 8, the method for transmitting signals includes：
Step 801, the multicarrier symbol that multiple classes are divided into according to sequence number is received；Wherein inhomogeneous multicarrier symbol
Constellation point by using different amplitudes is modulated；
Step 802, multicarrier symbol is subjected to Fourier transformation；
Step 803, the symbol carried out after Fourier transformation is despread；And
Step 804, all kinds of symbols are demodulated successively according to the size of constellation point amplitude；Wherein first demodulate constellation point width
The larger class symbol of degree, the less another kind of symbol of re-demodulation constellation point amplitude.
In the present embodiment, multicarrier symbol can be divided into K classes based on { (n-1) mod K }, and n is multicarrier symbol
Sequence number, K is over-sampling rate；But the invention is not restricted to this.
In the present embodiment, in the less symbol of demodulation constellation point amplitude, estimating for the symbol being demodulated can be used
Evaluation carries out interference elimination.
For example, so that symbol is divided into odd number class and even number class as an example, equation below can be used：
WhereinDeMod () is demodulation function, and n is the sequence number of multicarrier symbol；Y (n) is represented
Signal is received, C and DFT represent predetermined matrix respectively, and odd represents odd number, and even represents even number.
In one embodiment, so that symbol is divided into odd number class and even number class as an example, it can also use demodulated
The estimate of symbol, is iteratively demodulated to each symbol.
It is, for example, possible to use equation below：
Wherein, r is iteration sequence number.
In one embodiment, the influence of channel response matrix can also be considered under fading channel conditions.
It is, for example, possible to use equation below：
Wherein, H (n)=diag (H1(n) H2(n) ... HNK(n)), diag () is diagonal matrix generating function, Hf(n)
For the domain channel response of f-th of subcarrier of n-th of multicarrier symbol, 1≤f≤NK, and H-1(n) inverse matrix for being H (n), N
For the number of subchannel.
It is worth noting that, only symbolically the embodiment of the present invention is illustrated by Fig. 8, but the invention is not restricted to this.
The execution sequence between each step for example can be suitably adjusted, can additionally increase some other steps or reduction
Some steps therein.Those skilled in the art can carry out suitably modification according to the above, be not limited solely to above-mentioned
The record of accompanying drawing.
From above-described embodiment, transmitting terminal is adjusted to inhomogeneous symbol to be transmitted using the constellation point of different amplitudes
System, receiving terminal is demodulated successively according to the size of constellation point amplitude to all kinds of symbols；Thus, the modulation symbol on each subcarrier
Number can be complex values；The problem of application of FBMC systems is limited can be not only solved, and the transmission performance of system can be improved.
Embodiment 5
The embodiment of the present invention provides a kind of FBMC systems, is repeated no more with the identical content of embodiment 1 to 4.
Fig. 9 is the schematic diagram of the FBMC systems of the embodiment of the present invention, as shown in figure 9, FBMC systems 900 include：Transmitting terminal
901 and receiving terminal 902；Wherein transmitting terminal 901 can include the signal transmitting apparatus 100 described in embodiment 1, and receiving terminal 902 can
With including the signal transmitting apparatus 600 described in embodiment 2.
For example, 901 pairs of symbols to be transmitted for being divided into multiple classes according to sequence number of transmitting terminal are modulated, and per height
Modulation symbol on carrier wave is complex values；Wherein inhomogeneous symbol to be transmitted is adjusted by using the constellation point of different amplitudes
System；It is overlapped after symbol after modulation is carried out into spread spectrum and inverse Fourier transform, forms multicarrier symbol and send；
Receiving terminal 902 receives the multicarrier symbol that multiple classes are divided into according to sequence number；Multicarrier symbol is carried out in Fu
Leaf transformation and despread；And all kinds of symbols are demodulated successively according to the size of constellation point amplitude.
The embodiment of the present invention also provides a kind of emitter, is configured with signal transmitting apparatus 100 as described in Example 1.
Figure 10 is the schematic diagram of the emitter of the embodiment of the present invention.As shown in Figure 10, emitter 1000 can include：Center
Processor (CPU) 1001 and memory 110；Memory 110 is coupled to central processing unit 1001.Wherein the memory 110 can be deposited
Store up various data；The additionally program of storage information processing, and perform under the control of central processing unit 1001 program.
In one embodiment, the function of signal transmitting apparatus 100 can be integrated into central processing unit 1001.Its
In, central processing unit 1001 can be configured as realizing method for transmitting signals as described in Example 3.
For example, central processing unit 1001 can be configured to be controlled as follows：To being divided into multiple classes according to sequence number
Symbol to be transmitted is modulated, and the modulation symbol on each subcarrier is complex values；Wherein inhomogeneous symbol to be transmitted
Constellation point by using different amplitudes is modulated；Folded after symbol after modulation is carried out into spread spectrum and inverse Fourier transform
Plus, form multicarrier symbol and send.
In another embodiment, signal transmitting apparatus 100 can for example may be used with the separate configuration of central processing unit 1001
With the chip for being configured to be connected with central processing unit 1001 by signal transmitting apparatus 100, pass through the control of central processing unit 1001
To realize the function of signal transmitting apparatus 100.
In addition, as shown in Figure 10, emitter 1000 can also include：Input-output unit 120 etc.；Wherein, above-mentioned part
Function similarly to the prior art, here is omitted.It is worth noting that, emitter 1000 is also not necessary to include figure
All parts shown in 10；In addition, emitter 1000 can also include the part being not shown in Figure 10, it may be referred to existing
Technology.
The embodiment of the present invention also provides a kind of receiver, is configured with signal transmitting apparatus 600 as described in Example 2.Its
In the composition of the receiver may be referred to Figure 10, i.e., the receiver can include central processing unit (CPU) 1001 and memory
110。
For example, the central processing unit 1001 of the receiver can be configured to be controlled as follows：Reception is drawn according to sequence number
It is divided into the multicarrier symbol of multiple classes；Multicarrier symbol is subjected to Fourier transformation and despread；And according to constellation point amplitude
Size all kinds of symbols are demodulated successively.
The embodiment of the present invention also provides a kind of computer-readable program, wherein when performing described program in transmitters,
Described program causes the emitter to perform method for transmitting signals as described in Example 3.
The embodiment of the present invention also provides a kind of storage medium for the computer-readable program that is stored with, wherein the computer can
Reader causes emitter to perform method for transmitting signals as described in Example 3.
The embodiment of the present invention also provides a kind of computer-readable program, wherein when performing described program in receivers,
Described program causes the receiver to perform method for transmitting signals as described in Example 4.
The embodiment of the present invention also provides a kind of storage medium for the computer-readable program that is stored with, wherein the computer can
Reader causes receiver to perform method for transmitting signals as described in Example 4.
Apparatus and method more than of the invention can be realized by hardware, can also be realized by combination of hardware software.The present invention
It is related to such computer-readable program, when the program is performed by logical block, the logical block can be made to realize above
Described device or component parts, or the logical block is realized various methods or step described above.The invention further relates to
Storage medium for storing procedure above, such as hard disk, disk, CD, DVD, flash memory.
Hardware can be embodied directly in reference to the signal transmitting apparatus and/or method that the embodiment of the present invention is described, by processor
The software module of execution or the two combination.For example, one or more of functional block diagram shown in Fig. 1 and/or functional block diagram
One or more combinations (for example, modulating unit etc.), both can correspond to each software module of computer program flow, also
It can correspond to each hardware module.These software modules, can correspond respectively to each step shown in Fig. 7.These hardware
These software modules are for example solidified and realized by module using field programmable gate array (FPGA).
Above in association with specific embodiment, invention has been described, it will be appreciated by those skilled in the art that this
A little descriptions are all exemplary, are not limiting the scope of the invention.Those skilled in the art can be according to the present invention
Principle makes various variants and modifications to the present invention, and these variants and modifications are also within the scope of the invention.
On the embodiment including above example, following note are also disclosed：
A kind of (note 1) signal transmitting apparatus, is configured at filter bank multi-carrier system, the signal transmitting apparatus bag
Include：
Modulating unit, it is modulated to the symbol to be transmitted that multiple classes are divided into according to sequence number, and is carried per height
Modulation symbol on ripple is complex values；The wherein inhomogeneous symbol to be transmitted is adjusted by using the constellation point of different amplitudes
System；
Spectrum-spreading unit, it is spread the symbol after modulation；
Converter unit, the symbol after spread spectrum is carried out inverse Fourier transform by it；
Superpositing unit, the symbol after inverse Fourier transform is overlapped by it, forms multicarrier symbol；And
Transmitting element, it sends the multicarrier symbol.
The signal transmitting apparatus of (note 2) according to note 1, wherein, the continuous symbol to be transmitted of any two belongs to
Different classes.
The signal transmitting apparatus of (note 3) according to note 1, wherein, the constellation point of the different amplitudes meets as follows
Condition：
Wherein, dkRepresent the constellation point, akThe amplitude of the constellation point is represented, θ represents the phase of the constellation point；K is
Over-sampling rate, k is the positive integer more than or equal to 1 and less than or equal to K.
The signal transmitting apparatus of (note 4) according to note 3, wherein, the symbol to be transmitted is based on { (n-1) mod
K } K classes are divided into, n is the sequence number of the symbol to be transmitted；And kth class symbol to be transmitted is by using the constellation point dk
Modulated.
The signal transmitting apparatus of (note 5) according to note 3, wherein, the constellation point is 4 yuan of constellation points,
The signal transmitting apparatus of (note 6) according to note 3, wherein, in the situation of 4 yuan of constellation points of K=2 and use
Under, the constellation point of the different amplitudes includes the first constellation point and the second constellation point, is expressed as：
The signal transmitting apparatus of (note 7) according to note 6, wherein, serial number odd number in the symbol to be transmitted
Symbol is modulated by using first constellation point, and the symbol of serial number even number is by using described in the symbol to be transmitted
Second constellation point is modulated.
A kind of (note 8) signal transmitting apparatus, is configured at filter bank multi-carrier system, the signal transmitting apparatus bag
Include：
Receiving unit, it receives the multicarrier symbol that multiple classes are divided into according to sequence number；It is wherein inhomogeneous described many
Symbols are modulated by using the constellation point of different amplitudes；
Converter unit, the multicarrier symbol is carried out Fourier transformation by it；
Unit is despread, it is despread the symbol carried out after Fourier transformation；And
Demodulating unit, it is demodulated successively according to the size of constellation point amplitude to all kinds of symbols；Wherein first demodulate constellation
The larger class symbol of point amplitude, the less another kind of symbol of re-demodulation constellation point amplitude.
The signal transmitting apparatus of (note 9) according to note 8, wherein, the multicarrier symbol is based on { (n-1) mod
K } K classes are divided into, n is the sequence number of the multicarrier symbol, and K is over-sampling rate.
The signal transmitting apparatus of (note 10) according to note 8, wherein, the demodulating unit is demodulating the constellation point
During the less symbol of amplitude, the estimate for the symbol being demodulated is used to carry out interference elimination.
The signal transmitting apparatus of (note 11) according to note 10, wherein, the demodulating unit uses equation below：
WhereinDeMod () is demodulation function, and n is the sequence number of the multicarrier symbol；y(n)
Represent to receive signal, C and DFT represent predetermined matrix respectively, and odd represents odd number, and even represents even number.
The signal transmitting apparatus of (note 12) according to note 8, wherein, the demodulating unit is additionally operable to：Using having solved
The estimate of the symbol of tune, is iteratively demodulated to each symbol.
The signal transmitting apparatus of (note 13) according to note 12, wherein, the demodulating unit uses equation below：
Wherein, r is iteration sequence number, and n is the sequence number of the multicarrier symbol；Y (n) represents to receive signal, C and DFT difference
Predetermined matrix is represented, odd represents odd number, and even represents even number.
The signal transmitting apparatus of (note 14) according to note 8, wherein, the demodulating unit is additionally operable to：In decline letter
The influence of channel response matrix is considered under the conditions of road.
The signal transmitting apparatus of (note 15) according to note 14, wherein, the demodulating unit uses equation below：
Wherein H (n)=diag (H1(n) H2(n) ... HNK(n)), diag () is diagonal matrix generating function, Hf(n) it is
The domain channel response of f-th of subcarrier of n-th of multicarrier symbol, 1≤f≤NK, and H-1(n) it is H (n) inverse matrix, N is
The number of subchannel；N is the sequence number of the multicarrier symbol；C and DFT represent predetermined matrix respectively, and odd represents odd number,
Even represents even number.
A kind of (note 16) method for transmitting signals, applied to filter bank multi-carrier system, the method for transmitting signals bag
Include：
The symbol to be transmitted that multiple classes are divided into according to sequence number is modulated, and the modulation symbol on each subcarrier
Number be complex values；The wherein inhomogeneous symbol to be transmitted is modulated by using the constellation point of different amplitudes；
Symbol after modulation is spread；
Symbol after spread spectrum is subjected to inverse Fourier transform；
Symbol after inverse Fourier transform is overlapped, multicarrier symbol is formed；And
Send the multicarrier symbol.
A kind of (note 17) method for transmitting signals, applied to filter bank multi-carrier system, the method for transmitting signals bag
Include：
Receive the multicarrier symbol that multiple classes are divided into according to sequence number；The wherein inhomogeneous multicarrier symbol passes through
Constellation point using different amplitudes is modulated；
The multicarrier symbol is subjected to Fourier transformation；
The symbol carried out after Fourier transformation is despread；And
All kinds of symbols are demodulated successively according to the size of constellation point amplitude；Wherein first demodulation constellation point amplitude is larger
One class symbol, the less another kind of symbol of re-demodulation constellation point amplitude.
A kind of (note 18) emitter, including the signal transmitting apparatus as described in 1 to 7 any one of note.
A kind of (note 19) receiver, including the signal transmitting apparatus as described in 8 to 15 any one of note.
A kind of (note 20) filter bank multi-carrier system, the filter bank multi-carrier system includes：
Transmitting terminal, it is modulated to the symbol to be transmitted that multiple classes are divided into according to sequence number, and each subcarrier
On modulation symbol be complex values；The wherein inhomogeneous symbol to be transmitted is adjusted by using the constellation point of different amplitudes
System；It is overlapped after symbol after modulation is carried out into spread spectrum and inverse Fourier transform, forms multicarrier symbol and send；
Receiving terminal, it receives the multicarrier symbol that multiple classes are divided into according to sequence number；The multicarrier symbol is carried out
Fourier transformation and despread；And all kinds of symbols are demodulated successively according to the size of constellation point amplitude.
Claims (10)
1. a kind of signal transmitting apparatus, is configured at filter bank multi-carrier system, it is characterised in that the signal transmitting apparatus bag
Include：
Modulating unit, it is modulated to the symbol to be transmitted that multiple classes are divided into according to sequence number, and on each subcarrier
Modulation symbol be complex values；The wherein inhomogeneous symbol to be transmitted is modulated by using the constellation point of different amplitudes；
Spectrum-spreading unit, it is spread the symbol after modulation；
Converter unit, the symbol after spread spectrum is carried out inverse Fourier transform by it；
Superpositing unit, the symbol after inverse Fourier transform is overlapped by it, forms multicarrier symbol；And
Transmitting element, it sends the multicarrier symbol.
2. signal transmitting apparatus according to claim 1, wherein, the continuous symbol to be transmitted of any two belongs to different
Class.
3. signal transmitting apparatus according to claim 1, wherein, the constellation point of the different amplitudes meets following condition：
<mrow>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>d</mi>
<mi>k</mi>
</msub>
<mo>=</mo>
<msub>
<mi>a</mi>
<mi>k</mi>
</msub>
<mo>&CenterDot;</mo>
<msup>
<mi>e</mi>
<mrow>
<mi>j</mi>
<mi>&theta;</mi>
</mrow>
</msup>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>k</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>K</mi>
</munderover>
<msubsup>
<mi>a</mi>
<mi>k</mi>
<mn>2</mn>
</msubsup>
<mo>=</mo>
<mi>K</mi>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>a</mi>
<mn>1</mn>
</msub>
<mo>></mo>
<msub>
<mi>a</mi>
<mn>2</mn>
</msub>
<mo>></mo>
<mo>...</mo>
<mo>></mo>
<msub>
<mi>a</mi>
<mi>K</mi>
</msub>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>,</mo>
<msub>
<mi>a</mi>
<mi>k</mi>
</msub>
<mo>></mo>
<mn>0</mn>
</mrow>
Wherein, dkRepresent the constellation point, akThe amplitude of the constellation point is represented, θ represents the phase of the constellation point；K was to adopt
Sample rate, k is the positive integer more than or equal to 1 and less than or equal to K.
4. signal transmitting apparatus according to claim 3, wherein, the symbol to be transmitted is drawn based on { (n-1) mod K }
It is divided into K classes, mod is modulo operation, and n is the sequence number of the symbol to be transmitted；And kth class symbol is by using the constellation point
dkModulated.
5. signal transmitting apparatus according to claim 3, wherein, it is described in the case of 4 yuan of constellation points of K=2 and use
The constellation point of different amplitudes includes the first constellation point and the second constellation point, is expressed as：
<mrow>
<msub>
<mi>d</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<msqrt>
<mn>2</mn>
</msqrt>
<mi>c</mi>
<mi>o</mi>
<mi>s</mi>
<mi>&alpha;</mi>
<mo>&CenterDot;</mo>
<msup>
<mi>e</mi>
<mrow>
<mi>j</mi>
<mi>&theta;</mi>
</mrow>
</msup>
<mrow>
<mo>(</mo>
<mi>&theta;</mi>
<mo>&Element;</mo>
<mo>{</mo>
<mtable>
<mtr>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mfrac>
<mi>&pi;</mi>
<mn>4</mn>
</mfrac>
</mtd>
<mtd>
<mfrac>
<mi>&pi;</mi>
<mn>2</mn>
</mfrac>
</mtd>
<mtd>
<mfrac>
<mrow>
<mn>3</mn>
<mi>&pi;</mi>
</mrow>
<mn>4</mn>
</mfrac>
</mtd>
</mtr>
</mtable>
<mo>}</mo>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msub>
<mi>d</mi>
<mn>2</mn>
</msub>
<mo>=</mo>
<msqrt>
<mn>2</mn>
</msqrt>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mi>&alpha;</mi>
<mo>&CenterDot;</mo>
<msup>
<mi>e</mi>
<mrow>
<mi>j</mi>
<mi>&theta;</mi>
</mrow>
</msup>
<mrow>
<mo>(</mo>
<mi>&theta;</mi>
<mo>&Element;</mo>
<mo>{</mo>
<mtable>
<mtr>
<mtd>
<mn>0</mn>
</mtd>
<mtd>
<mfrac>
<mi>&pi;</mi>
<mn>4</mn>
</mfrac>
</mtd>
<mtd>
<mfrac>
<mi>&pi;</mi>
<mn>2</mn>
</mfrac>
</mtd>
<mtd>
<mfrac>
<mrow>
<mn>3</mn>
<mi>&pi;</mi>
</mrow>
<mn>4</mn>
</mfrac>
</mtd>
</mtr>
</mtable>
<mo>}</mo>
<mo>)</mo>
</mrow>
<mo>.</mo>
</mrow>
6. signal transmitting apparatus according to claim 5, wherein, the symbol of serial number odd number leads in the symbol to be transmitted
Cross and modulated using first constellation point, the symbol of serial number even number is by using second star in the symbol to be transmitted
Seat point is modulated.
7. a kind of signal transmitting apparatus, is configured at filter bank multi-carrier system, it is characterised in that the signal transmitting apparatus bag
Include：
Receiving unit, it receives the multicarrier symbol that multiple classes are divided into according to sequence number；The wherein inhomogeneous multicarrier
Symbol is modulated by using the constellation point of different amplitudes；
Converter unit, the multicarrier symbol is carried out Fourier transformation by it；
Unit is despread, it is despread the symbol carried out after Fourier transformation；And
Demodulating unit, it is demodulated successively according to the size of constellation point amplitude to all kinds of symbols；Wherein first demodulate constellation point width
The larger class symbol of degree, the less another kind of symbol of re-demodulation constellation point amplitude.
8. signal transmitting apparatus according to claim 7, wherein, the demodulating unit demodulate the constellation point amplitude compared with
During small symbol, the estimate for the symbol being demodulated is used to carry out interference elimination.
9. signal transmitting apparatus according to claim 7, wherein, the demodulating unit is additionally operable to：Use demodulated symbol
Number estimate, iteratively each symbol is demodulated；And/or, the shadow of channel response matrix is considered under fading channel conditions
Ring.
10. a kind of filter bank multi-carrier system, it is characterised in that the filter bank multi-carrier system includes：
Transmitting terminal, it is modulated to the symbol to be transmitted that multiple classes are divided into according to sequence number, and on each subcarrier
Modulation symbol is complex values；The wherein inhomogeneous symbol to be transmitted is modulated by using the constellation point of different amplitudes；Will
Symbol after modulation is overlapped after carrying out spread spectrum and inverse Fourier transform, is formed multicarrier symbol and is sent；
Receiving terminal, it receives the multicarrier symbol that multiple classes are divided into according to sequence number；The multicarrier symbol is carried out in Fu
Leaf transformation and despread；And all kinds of symbols are demodulated successively according to the size of constellation point amplitude.
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