CN110048974A - A kind of half code block of mixed carrier system reversion deversity scheme - Google Patents
A kind of half code block of mixed carrier system reversion deversity scheme Download PDFInfo
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- CN110048974A CN110048974A CN201910335941.3A CN201910335941A CN110048974A CN 110048974 A CN110048974 A CN 110048974A CN 201910335941 A CN201910335941 A CN 201910335941A CN 110048974 A CN110048974 A CN 110048974A
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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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
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Abstract
A kind of half code block of mixed carrier system reversion deversity scheme, it belongs to wireless communication technology field.The problem of present invention solves in mixed carrier system, causes receiving end diversity gain to be restricted due to the correlation of time-domain signal and time domain reverse signal.Signal to be processed is passed through four-item weight score Fourier transformation by the present invention, will be former and later two half code blocks by time-domain signal and the code block segmentation that time domain reverse signal forms after transformation, then carry out reversion group to rear half of code block and be combined into new signal, and pass through antenna and emit；Receiving end carries out inverse transformation according to the inverting method of transmitting terminal, then carries out demodulation and obtain reception signal；The present invention can reduce the correlation of two time-domain signals inside code block, reduce time-domain signal and the probability to decline deeply occurs for time domain reverse signal same position, two time domain components after making weighted score Fourier transformation are similar to independent decline, achieve the purpose that improve receiving end diversity gain.Present invention could apply to wireless communication technology fields.
Description
Technical field
The invention belongs to wireless communication technology fields, and in particular to a kind of half code block of mixed carrier system reversion diversity side
Method.
Background technique
Single-carrier system in legacy communications system is by weighted score Fourier transformation with multicarrier system Unified Expression
One mixed carrier system provides theoretical foundation for different carrier wave system fusions, and weighted score Fourier transformation exists
Special nature on time-frequency plane is widely used it in signal of communication anti-intercepting and capturing and anti-interference aspect.It is classical
Four-item weight transformation (4-WFRFT) in, by signal decomposition be time-domain signal, time domain reverse signal, frequency-region signal and frequency domain it is anti-
The weighted sum of rotaring signal, wherein the correlation of time-domain signal and time domain reverse signal, which is presented, gradually becomes strong from both ends to the middle and becomes
Gesture.Under mixed carrier system, time-domain signal and time domain reverse signal multiplexing of transmission, if time-domain signal and time domain reverse signal phase
Closing property is excessively high, then will will increase in the probability that declining deeply occurs in same position, this phenomenon will make the receiving end of mixed carrier system
Diversity gain is restricted.
Summary of the invention
The purpose of the present invention is being solution in mixed carrier system, since time-domain signal is related to time domain reverse signal
The problem of property causes receiving end diversity gain to be restricted.
The technical solution adopted by the present invention to solve the above technical problem is: a kind of half code block of mixed carrier system reversion point
Set method, method includes the following steps:
Step 1: choosing four characteristic values of fractional fourier transform according to the formation sequence of fractional fourier transform；
For four-item weight score Fourier transformation, four characteristic values of four-item weight score Fourier transformation are respectively
λ0, λ1, λ2And λ3；
Step 2: four eigenvalue λs chosen according to step 10, λ1, λ2And λ3Four-item weight score Fourier is calculated to become
The direct transform weighting coefficient w changed0,w1,w2And w3；
Step 3: data to be sent are modulated modulated after data；And data after modulation are equivalent to one long
Degree is the data block of 2N, the data block that the length is 2N is denoted as g (x), N is positive integer；
Step 4: the direct transform weighting coefficient w obtained according to step 20,w1,w2And w3To the data block g (x) of step 3
It is weighted fractional Fourier direct transform, the data block after obtaining weighted score Fourier direct transform；
Step 5: the data block that step 4 is obtained is divided into half code block of two equal lengths, the i.e. length of two and half code blocks
Degree is N, and two and half code blocks are denoted as X respectively0And X1；
By half code block X1Inverse transform is carried out, half code block X after obtaining inverse transform1′；By X0With X1' group is combined into new code
Block, new code block are sent by antenna；
Step 6: receiver receives new code block, to half code block X in new code block1' reversion inverse transformation is carried out, invert inversion
It changes rear data block and restores normal sequence, demodulation is carried out to the data block for restoring normal sequence and obtains reception signal r (x)；
Step 7: four eigenvalue λs of the fractional Fourier transform chosen according to step 10, λ1, λ2And λ3Calculate four
The inverse transformation weighting coefficient of weighted score Fourier transformationWith
Step 8: the inverse transformation weighting coefficient of the four-item weight score Fourier transformation obtained according to step 7WithFractional Inverse Fourier Transform is weighted to the reception signal r (x) of step 6, acquisition is weighted point
Signal after number inverse Fourier transform；
Step 9: the signal that step 8 obtains is made decisions, it is final to obtain transmission information.
The beneficial effects of the present invention are: the present invention provides a kind of half code blocks of mixed carrier system to invert deversity scheme, this
Invention by classical four-item weight score Fourier transformation, will become signal to be processed by classical four-item weight score Fourier
The code block segmentation being made of time-domain signal and time domain reverse signal got in return is former and later two half code blocks, is advised further according to reversion
Rear half of code block is then subjected to reversion group and is combined into new signal, and is emitted by antenna；Receiving end receives after signal according to transmitting terminal
Inverting method carry out inverse transformation, then carry out demodulation obtain receive signal；It can be reduced inside code block using method of the invention
To reduce time-domain signal and time domain reverse signal same position the probability to decline deeply occurs for the correlation of two time-domain signals, in turn
Two time domain components after making weighted score Fourier transformation are similar to independent decline, are finally reached and improve receiving end diversity gain
Purpose.
Moreover, error rate of system can be reduced by 2% or so using method of the invention.
Detailed description of the invention
Fig. 1 is a kind of flow chart of half code block of mixed carrier system reversion deversity scheme of the invention；
Fig. 2 is the schematic diagram of half code block reversion process of the invention；
Wherein: x0It is first coded identification in data block g (x), and so on；
Fig. 3 is bit error rate performance gain effect analogous diagram of the method for the present invention to generalized mixed carrier transmission method.
Specific embodiment
Specific embodiment 1: illustrating present embodiment in conjunction with Fig. 1, Fig. 2 and Fig. 3.One kind described in present embodiment is mixed
It closes half code block of carrier system and inverts deversity scheme, method includes the following steps:
Step 1: choosing four characteristic values of fractional fourier transform according to the formation sequence of fractional fourier transform；
For four-item weight score Fourier transformation, four characteristic values of four-item weight score Fourier transformation are respectively
λ0, λ1, λ2And λ3；
Step 2: four eigenvalue λs chosen according to step 10, λ1, λ2And λ3Four-item weight score Fourier is calculated to become
The direct transform weighting coefficient w changed0,w1,w2And w3；
Step 3: data to be sent are modulated modulated after data；And data after modulation are equivalent to one long
Degree is the data block of 2N, the data block that the length is 2N is denoted as g (x), N is positive integer；
Step 4: the direct transform weighting coefficient w obtained according to step 20,w1,w2And w3To the data block g (x) of step 3
It is weighted fractional Fourier direct transform, the data block after obtaining weighted score Fourier direct transform；
Step 5: the data block that step 4 is obtained is divided into half code block of two equal lengths, the i.e. length of two and half code blocks
Degree is N, and two and half code blocks are denoted as X respectively0And X1；
By half code block X1Inverse transform is carried out, half code block X after obtaining inverse transform1′；By X0With X1' group is combined into new code
Block, new code block are sent by antenna；
Since frequency-region signal is symmetrical with time-domain signal, therefore only reversion time-domain signal and the signal inverted after whole direct transforms are imitated
Fruit is identical, and reversion process is as shown in Figure 2.
Step 6: receiver receives new code block, to half code block X in new code block1' reversion inverse transformation is carried out, invert inversion
It changes rear data block and restores normal sequence, demodulation is carried out to the data block for restoring normal sequence and obtains reception signal r (x)；
Step 7: four eigenvalue λs of the fractional Fourier transform chosen according to step 10, λ1, λ2And λ3Calculate four
The inverse transformation weighting coefficient of weighted score Fourier transformationWith
Step 8: the inverse transformation weighting coefficient of the four-item weight score Fourier transformation obtained according to step 7WithFractional Inverse Fourier Transform is weighted to the reception signal r (x) of step 6, acquisition is weighted point
Signal after number inverse Fourier transform；
Step 9: the signal that step 8 obtains is made decisions, it is final to obtain transmission information.
The four-item weight score Fourier transformation of present embodiment belongs to one of fractional fourier transform.
Present embodiment is by carrying out half code block reversion for time domain composite signal, then is reconstructed into new code block transmission, reduces
Correlation inside code block, reduces time-domain signal and the probability to decline deeply occurs for time domain reverse signal same position, makes to transmit
Signal is approximately two independent fading signals, and this method can reach reduction error rate of system, obtains additional receiving end diversity
The purpose of gain.
Fig. 3 shows: the gain in terms of also having the bit error rate to existing system using half code block inverting method of the invention, and
And it is applicable in all systems are obtained within the scope of fractional Fourier transform.
Specific embodiment 2: the present embodiment is different from the first embodiment in that: the specific mistake of the step 1
Journey are as follows:
Four characteristic values of fractional fourier transform are chosen according to the formation sequence of fractional fourier transform；For classics
Four-item weight score Fourier transformation, four eigenvalue λs of four-item weight score Fourier transformation0, λ1, λ2And λ3It is respectively as follows:
Wherein: α indicates order of modulation.
Eigenvalue λ0, λ1, λ2And λ3In asymmetric distribution, it is the period with 4, that is, meets λ4r=λ0, r is nonnegative integer.
Specific embodiment 3: present embodiment is unlike specific embodiment two: the specific mistake of the step 2
Journey are as follows:
Wherein, w0,w1,w2And w3It is the direct transform weighting coefficient of four-item weight score Fourier transformation, i is imaginary number list
Position, e is natural constant.
Specific embodiment 4: present embodiment is unlike specific embodiment three: the specific mistake of the step 4
Journey are as follows:
The direct transform weighting coefficient w obtained according to step 20,w1,w2And w3The data block g (x) of step 3 is weighted
Fractional Fourier direct transform:
Fα[g (x)]=w0g(x)+w1G(x)+w2g(-x)+w3G(-x)
In formula: g (- x) is time domain reverse signal, and G (x) is the corresponding frequency-region signal of g (x), and G (- x) is that g (- x) is corresponding
Frequency domain reverse signal, Fα[g (x)] representative is weighted the data block after fractional Fourier direct transform.
Specific embodiment 5: present embodiment is unlike specific embodiment four: the specific mistake of the step 7
Journey are as follows:
Wherein,WithIt is the inverse transformation weighting coefficient of four-item weight score Fourier transformation.
Specific embodiment 6: present embodiment is unlike specific embodiment five: the specific mistake of the step 8
Journey are as follows:
In formula, r (x) be receive signal, R (x) be the corresponding frequency-region signal of r (x), r (- x) be time domain reverse signal, R (-
It x) is r (- x) corresponding frequency domain reverse signal, F-α[r (x)] representative is weighted the signal after Fractional Inverse Fourier Transform.
Above-mentioned example of the invention only explains computation model and calculation process of the invention in detail, and is not to this
The restriction of the embodiment of invention.It for those of ordinary skill in the art, on the basis of the above description can be with
It makes other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to the present invention
The obvious changes or variations extended out of technical solution still in the scope of protection of the present invention.
Claims (6)
1. a kind of half code block of mixed carrier system inverts deversity scheme, which is characterized in that method includes the following steps:
Step 1: choosing four characteristic values of fractional fourier transform according to the formation sequence of fractional fourier transform；
For four-item weight score Fourier transformation, four characteristic values of four-item weight score Fourier transformation are respectively λ0, λ1,
λ2And λ3；
Step 2: four eigenvalue λs chosen according to step 10, λ1, λ2And λ3Calculate four-item weight score Fourier transformation just
Convert weighting coefficient w0,w1,w2And w3；
Step 3: data to be sent are modulated modulated after data；And data after modulation are equivalent to a length and are
The data block that the length is 2N is denoted as g (x) by the data block of 2N, and N is positive integer；
Step 4: the direct transform weighting coefficient w obtained according to step 20,w1,w2And w3The data block g (x) of step 3 is added
Fractional Fourier direct transform is weighed, the data block after obtaining weighted score Fourier direct transform；
Step 5: the data block that step 4 is obtained is divided into half code block of two equal lengths, i.e. the length of two and half code blocks is equal
For N, two and half code blocks are denoted as X respectively0And X1；
By half code block X1Inverse transform is carried out, half code block X ' after obtaining inverse transform1；By X0With X '1Group is combined into new code block, new code
Block is sent by antenna；
Step 6: receiver receives new code block, to half code block X ' in new code block1Reversion inverse transformation is carried out, number after inverse transformation is inverted
Restore normal sequence according to block, demodulation is carried out to the data block for restoring normal sequence and obtains reception signal r (x)；
Step 7: four eigenvalue λs of the fractional Fourier transform chosen according to step 10, λ1, λ2And λ3Calculate four-item weight point
The inverse transformation weighting coefficient of number Fourier transformationWith
Step 8: the inverse transformation weighting coefficient of the four-item weight score Fourier transformation obtained according to step 7WithFractional Inverse Fourier Transform is weighted to the reception signal r (x) of step 6, acquisition is weighted fractional Fourier inversion
Signal after changing；
Step 9: the signal that step 8 obtains is made decisions, it is final to obtain transmission information.
2. a kind of half code block of mixed carrier system according to claim 1 inverts deversity scheme, which is characterized in that the step
Rapid one detailed process are as follows:
Four characteristic values of fractional fourier transform are chosen according to the formation sequence of fractional fourier transform；For four-item weight point
Number Fourier transformation, four eigenvalue λs of four-item weight score Fourier transformation0, λ1, λ2And λ3It is respectively as follows:
Wherein: α indicates order of modulation.
3. a kind of half code block of mixed carrier system according to claim 2 inverts deversity scheme, which is characterized in that the step
Rapid two detailed process are as follows:
Wherein, w0,w1,w2And w3It is the direct transform weighting coefficient of four-item weight score Fourier transformation, i is imaginary unit, and e is
Natural constant.
4. a kind of half code block of mixed carrier system according to claim 3 inverts deversity scheme, which is characterized in that the step
Rapid four detailed process are as follows:
The direct transform weighting coefficient w obtained according to step 20,w1,w2And w3Score is weighted to the data block g (x) of step 3
Fourier's direct transform:
Fα[g (x)]=w0g(x)+w1G(x)+w2g(-x)+w3G(-x)
In formula: g (- x) is time domain reverse signal, and G (x) is the corresponding frequency-region signal of g (x), and G (- x) is g (- x) corresponding frequency domain
Reverse signal, Fα[g (x)] representative is weighted the data block after fractional Fourier direct transform.
5. a kind of half code block of mixed carrier system according to claim 4 inverts deversity scheme, which is characterized in that the step
Rapid seven detailed process are as follows:
Wherein,WithIt is the inverse transformation weighting coefficient of four-item weight score Fourier transformation.
6. a kind of half code block of mixed carrier system according to claim 5 inverts deversity scheme, which is characterized in that the step
Rapid eight detailed process are as follows:
In formula, r (x) is to receive signal, and R (x) is the corresponding frequency-region signal of r (x), and r (- x) is time domain reverse signal, and R (- x) is r
(- x) corresponding frequency domain reverse signal, F-α[r (x)] representative is weighted the signal after Fractional Inverse Fourier Transform.
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