CN108134752A - A kind of method and system for eliminating intersymbol interference - Google Patents

A kind of method and system for eliminating intersymbol interference Download PDF

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Publication number
CN108134752A
CN108134752A CN201611091716.2A CN201611091716A CN108134752A CN 108134752 A CN108134752 A CN 108134752A CN 201611091716 A CN201611091716 A CN 201611091716A CN 108134752 A CN108134752 A CN 108134752A
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China
Prior art keywords
output data
carrier
input
phase
way
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Inventor
栾志斌
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Sanechips Technology Co Ltd
Shenzhen ZTE Microelectronics Technology Co Ltd
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Shenzhen ZTE Microelectronics Technology Co Ltd
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Priority to CN201611091716.2A priority Critical patent/CN108134752A/en
Priority to PCT/CN2017/102527 priority patent/WO2018099162A1/en
Publication of CN108134752A publication Critical patent/CN108134752A/en
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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
    • 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
    • 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
    • H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
    • 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
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03248—Arrangements for operating in conjunction with other apparatus
    • H04L25/03273—Arrangements for operating in conjunction with other apparatus with carrier recovery circuitry

Abstract

The embodiment of the invention discloses a kind of method and system for eliminating intersymbol interference, method includes：Input data with first carrier is multiplied, obtains the first output data, first carrier is the local carrier recovered by carrier track device；First output data is input at least two-way balanced device, and obtain the second output data；It is exported the second output data as final output data, the second output data is input to carrier track device.The method and system provided in an embodiment of the present invention for eliminating intersymbol interference can reduce the complexity of operation while data throughput is improved.

Description

A kind of method and system for eliminating intersymbol interference
Technical field
The present invention relates to the communications field more particularly to a kind of method and system for eliminating intersymbol interference.
Background technology
At present, the transmission rate of short-distance wireless communication and signal bandwidth are higher and higher, and since channel multi-path dense prolongs When, serious intersymbol interference is often resulted in, therefore, it is necessary to eliminate intersymbol interference by adaptive equalizer.
Existing balancer design method usually first passes through carrier track and recovers correct carrier wave, then by balanced device into Row equilibrium treatment.Specifically, existing balanced device includes many kinds, for example, decision feedback equalization (DFE) and single-carrier frequency-domain Balanced (SC-FDE).Wherein, DFE using the information of leading decision symbol next symbol is adjudicated, the effect of feedback is Feedforward will be sent by correct symbol before, with intersymbol interference caused by detection symbols before elimination, so as to adjudicate next symbol Number；SC-FDE is utilized in Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) The thought of cyclic prefix adds in cyclic prefix to overcome the interference between data block in originator, while utilizes cyclic prefix by line Property convolution be converted into cyclic convolution, using the diagonalizable characteristic of Channel cyclical matrix, be in simple quick Fu in receiving terminal Leaf transformation (FFT, Fast Fourier Transformation) and its inverse transformation (IFFT, Inverse Fast Fourier Transform) carry out equalization channel.
However, presence of the existing DFE due to feedback control loop, data throughput are relatively low；And the calculating of SC-FDE is answered Miscellaneous degree is higher.That is, the existing method for eliminating intersymbol interference can not reduce operation while data throughput is improved Complexity.
Invention content
In order to solve the above technical problems, an embodiment of the present invention is intended to provide a kind of method and system for eliminating intersymbol interference, While data throughput is improved, the complexity of operation can be reduced.
The technical proposal of the invention is realized in this way：
In a first aspect, the embodiment of the present invention provides a kind of method for eliminating intersymbol interference, method includes：
Input data with first carrier is multiplied, obtains the first output data, first carrier is passes through carrier track device The local carrier recovered；
First output data is input at least two-way balanced device, and obtain the second output data；
It is exported the second output data as final output data, the second output data is input to carrier track dress It puts.
Further, before the first output data of acquisition that input data is multiplied with first carrier, method further includes：
Carrier track is carried out, and obtain first carrier to the second output data using carrier track device.
Further, the first output data is input at least two-way balanced device, and obtains the second output data, it is specific to wrap It includes：
First output data is divided into the first subdata of at least two-way corresponding at least two-way balanced device；
At least the first subdata of two-way is input to corresponding at least two-way balanced device；
According at least equalizer coefficients of the first subdata of two-way and preset each balanced device, obtain equal at least two-way Corresponding the second subdata of at least two-way of weighing apparatus；
Second output data is generated according at least the second subdata of two-way.
Further, carrier track device includes phase discriminator group, loop filter, accumulator and mapper, utilizes carrier wave Tracks of device carries out the second output data carrier track and obtains first carrier, specifically includes：
Second output data is input to phase discriminator group and obtains phase error；
Phase error is input to loop filter and obtains phase pushing figure；
Phase pushing figure is input to accumulator and obtains current carrier phase；
Current carrier phase is input to mapper and obtains first carrier.
Further, the phase error extraction equation of phase discriminator group is：
Δ θ=f (y (Ln))+f(y(Ln+1))+…+f(y(Ln+L-1))
Wherein, y (Ln) be the second output data Zhong No. n-th balanced devices output data, 0<n<L, Δ θ are phase discriminator group The phase error of extraction.
Second aspect, the embodiment of the present invention provide a kind of system for eliminating intersymbol interference, system include multiplier, it is parallel Weighing apparatus group, output device and carrier track device, wherein：
Multiplier for input data to be multiplied with first carrier, obtains the first output data, first carrier is passes through load The local carrier that wave tracks of device recovers；
Concurrent equalizer group, the first output data for being obtained according to multiplier obtains the second output data, parallel equal Weighing apparatus group includes at least two-way balanced device；
Output device, it is defeated for being carried out using the second output data that concurrent equalizer group obtains as final output data Go out；
Carrier track device, the second output data for being obtained according to concurrent equalizer group export first carrier.
Further, carrier track device is specifically used for：
Carrier track is carried out, and obtain first carrier to the second output data.
Further, concurrent equalizer group is specifically used for：
The first output data that multiplier obtains is divided into the first son of at least two-way corresponding at least two-way balanced device Data；At least the first subdata of two-way is input to corresponding at least two-way balanced device；According at least the first subdata of two-way and The equalizer coefficients of preset each balanced device obtain the second subdata of at least two-way corresponding at least two-way balanced device；According to At least the second subdata of two-way generates the second output data.
Further, carrier track device includes phase discriminator group, loop filter, accumulator and mapper, carrier track Device is specifically used for：
Second output data is input to phase discriminator group and obtains phase error；
Phase error is input to loop filter and obtains phase pushing figure；
Phase pushing figure is input to accumulator and obtains current carrier phase；
Current carrier phase is input to mapper and obtains first carrier.
Further, the phase error extraction equation of phase discriminator group is：
Δ θ=f (y (Ln))+f(y(Ln+1))+…+f(y(Ln+L-1))
Wherein, y (Ln) be the second output data Zhong No. n-th balanced devices output data, 0<n<L, Δ θ are phase discriminator group The phase error of extraction.
An embodiment of the present invention provides a kind of method and system for eliminating intersymbol interference, by the way that input data and first are carried Wave is multiplied, and obtains the first output data, first carrier is the local carrier recovered by carrier track device；By the first output Data are input at least two-way balanced device, and obtain the second output data；Using the second output data as final output data into Row output, carrier track device is input to by the second output data.Using technical solution provided in an embodiment of the present invention, due to adopting Multichannel data is handled simultaneously with the balanced device group for including at least two-way balanced device, thus improves data throughput； Simultaneously as concurrent equalizer group and the algorithm operation of carrier track device are simple, thus the complexity of operation is reduced, it can See, the method and system provided in an embodiment of the present invention for eliminating intersymbol interference reduce fortune while data throughput is improved The complexity of calculation.
Description of the drawings
Fig. 1 is a kind of flow diagram one of method for eliminating intersymbol interference provided in an embodiment of the present invention；
Fig. 2 is a kind of flow diagram two of method for eliminating intersymbol interference provided in an embodiment of the present invention；
Fig. 3 is a kind of structure diagram of loop filter provided in an embodiment of the present invention；
Fig. 4 is a kind of structure diagram one for eliminating intersymbol interference system provided in an embodiment of the present invention；
Fig. 5 is a kind of structure diagram two for eliminating intersymbol interference system provided in an embodiment of the present invention；
Fig. 6 a kind of has the carrier phase figure recovered during frequency deviation to be provided in an embodiment of the present invention；
Fig. 7 is a kind of ber curve contrast schematic diagram provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Site preparation describes.
Embodiment one
Fig. 1 is a kind of flow diagram of method for eliminating intersymbol interference provided in an embodiment of the present invention, referring to Fig. 1 institutes Show, method includes：
Step 101：Input data with first carrier is multiplied, obtains the first output data, first carrier is passes through carrier wave The local carrier that tracks of device recovers；
In practical application, input data is typically complex data, and therefore, input data is multiplied with first carrier to lead to Cross complex multiplier realization.
It is intelligible, the first output data is obtained by the way that input data is multiplied with first carrier, carrier wave can be eliminated The influence of frequency deviation.
Illustratively, refering to what is shown in Fig. 2, before step 101, method further includes step 100, wherein, step 100 is specific For：
Step 100：Carrier track is carried out, and obtain first carrier to the second output data using carrier track device.
It should be noted that carrier track is commonly used in recovering correct carrier wave, so as to solve the problems, such as carrier wave frequency deviation.
Further, carrier track device includes phase discriminator group, loop filter, accumulator and mapper, and step 100 is wrapped Step 1001- steps 1004 are included, wherein, step 1001- steps 1004 are specific as follows：
Step 1001：Second output data is input to phase discriminator group and obtains phase error；
Step 1002：Phase error is input to loop filter and obtains phase pushing figure；
Step 1003：Phase pushing figure is input to accumulator and obtains current carrier phase；
Step 1004：Current carrier phase is input to mapper and obtains first carrier.
Hereinafter, phase discriminator group, loop filter, accumulator and the mapper that carrier track device includes are illustrated, Wherein：
1st, phase discriminator can calculate output for extracting the data of the second output data, the i.e. output of concurrent equalizer group Data relative to data in ideal constellation phase error.
2nd, loop filter is used to the practical phase for sending carrier wave be become according to the phase error computation local carrier of extraction Change amount if the phase of local carrier is less than the practical phase for sending carrier wave, generates a positive phase pushing figure, if this The phase of ground carrier wave is more than the practical phase for sending carrier wave, then generates a negative phase pushing figure.
3rd, accumulator is used to obtained carrier phase offset amount obtaining current carrier phase by cumulative.
4th, mapper is used to recover first carrier, i.e. local carrier by mapping table according to current carrier phase.And lead to It crosses input multiplier to be multiplied with input data, realizes and phase place is carried out to input data.
Thus, the second output data is sequentially inputted to the phase discriminator group of carrier track device, loop filter, is tired out Add device and mapper, carrier track is carried out, and obtain first carrier to the second output data using carrier track device, that is, is restored Go out correct local carrier.
Preferably, the phase error extraction equation of phase discriminator group is：
Δ θ=f (y (Ln))+f(y(Ln+1))+…+f(y(Ln+L-1))
Wherein, y (Ln) be the second output data Zhong No. n-th balanced devices output data, 0<n<L, Δ θ are phase discriminator group The phase error of extraction.
Intelligible, the phase error extraction equation of the single phase discriminator in phase discriminator group is：
F (y)=- sgn (real (y)) × sgn (imag (y)) × sgn (real (y)+imag (y)) × sgn (real (y)- imag(y))
Wherein, y is the input data of the second output data, i.e. single phase discriminator in phase discriminator group, and f (y) is single mirror The phase error of phase device extraction；The phase error for obtaining phase discriminator group according to the parallelization of carrier tracking loop extracts equation.
In practical application, there are many structures of loop filter, for example, common structure shown in Fig. 3 may be used.Its In, COEFFICIENT KPWith KiIt is two key coefficients of loop filter, is respectively used to the speed and precision of control carrier track.KPWith KiThe selection of the two parameters needs to combine specific application environment, such as the size of carrier wave frequency deviation, the length of training sequence, leads to The method for crossing emulation calculates its reference value.Certainly, the embodiment of the present invention does not limit the concrete form of the structure of loop filter It is fixed.
Step 102：First output data is input at least two-way balanced device, and obtain the second output data；
The first output data is input at least two-way equilibrium it should be noted that can be realized by concurrent equalizer group Device, wherein, concurrent equalizer group includes at least two-way balanced device.Concurrent equalizer group is used to dynamically estimate the change of wireless channel Change so as to eliminate intersymbol interference.First output data is input to concurrent equalizer group can solve the problems, such as intersymbol interference.
Intelligible, concurrent equalizer group inputs the first output data respectively due to including at least two-way balanced device Each balanced device into concurrent equalizer group.Specifically, Fig. 4 shows the structure diagram for eliminating intersymbol interference system, ginseng It examines shown in Fig. 4, the first output data is divided at least two-way i.e. x [Ln：Ln+L-1], data x [Ln] input first via balanced device, data x[Ln+1] input No. second balanced device, and so on, by data x [Ln+L-1] input L roads balanced device.As it can be seen that pass through parallelization The structure of balanced device group can realize the parallel processing of data, so as to improve data throughput.
Further, step 102 specifically includes：First output data is divided into corresponding extremely at least two-way balanced device The first subdata of few two-way；At least the first subdata of two-way is input to corresponding at least two-way balanced device；According at least two-way The equalizer coefficients of first subdata and preset each balanced device obtain corresponding at least two-way balanced device at least two-way the Two subdatas；Second output data is generated according at least the second subdata of two-way.
In practice, at least two-way balanced device can be realized by concurrent equalizer group, wherein, the update side of concurrent equalizer group Journey, including：
Wherein, x (Ln) it is input data, y (Ln) be the second output data Zhong No. n-th balanced devices output data, 0<n< L, W (n) are equalizer coefficients, and d (n) is tutor's sequence, e (Ln) it is error sequence, μ is iteration step length.
It should be noted that the renewal equation per balanced device all the way in concurrent equalizer group is：
Intelligible, the renewal equation per balanced device all the way in concurrent equalizer group, logical concurrent operation can push away It leads to obtain the renewal equation of concurrent equalizer group.
It should be noted that balanced device uses linear equalization, algorithm of the generally use based on gradient, for example, lowest mean square ERROR ALGORITHM (LMS, Least mean square), zero forcing algorithm, steepest descent algorithm, recursive least squares algorithm (RLS, Recursive Least Square) and various blind equalization algorithms etc..Certainly, adaptive equalizer can also use other Algorithm is realized adaptively, for example, the embodiment of the present invention does not do adaptive algorithm specific limitation.
In addition, the performance parameter of concurrent equalizer group essentially consists in the renewal equation per balanced device all the way, if the present invention is real The application scenarios for applying a kind of method of elimination intersymbol interference of example offer are mostly quasi-static channel scenario, then equalizer coefficients update Speed it is slower, therefore the performance of system is not interfered with using parallel algorithm.
You need to add is that since concurrent equalizer group includes the balanced device of at least two-way parallel connection, export every time The form of second output data can be the serial number of the parallel data of parallel output L bits or 1 bit of Serial output According to.It should be noted that the second output data can be by parallel-serial conversion come altered form.
It should be noted that the structure of concurrent equalizer group uses the design method of low latency, ensure the receipts of entire loop Holding back property.And due to by parallelization equaliser structure, higher data throughput being realized, for example, symbol stage speed is up to 300MSPS；And intersymbol interference and the influence of carrier wave frequency deviation can be overcome simultaneously, and can meet the bit error rate of rear class decoder Demand.
Step 103：It is exported the second output data as final output data, the second output data is input to load Wave tracks of device.
In practical application, the second output data is input to carrier track device so as to after iteration several times so that Whole system can reach convergence state, i.e. final output data not only carrierfree frequency deviation, but also eliminate intersymbol interference.
Intelligible, the second output data of concurrent equalizer group output was both exported for final output data, simultaneously Also it is used for being input to the current carrier phase error of carrier track device extraction so that carrier track device exports first carrier, So as to which whole system be enabled to constitute a loop.
In practical application, by having carried out flow under the technique of TSMC 0.13um, the results showed that, the embodiment of the present invention The power consumption of the method for elimination intersymbol interference provided is only 12.4mW, and character rate reaches 300MSPS.That is, according to reality Trample verification result, an embodiment of the present invention provides elimination intersymbol interference method, throughput and error performance can be improved, save Power consumption is saved.
An embodiment of the present invention provides a kind of method for eliminating intersymbol interference, by by input data and first carrier phase Multiply, obtain the first output data, first carrier is the local carrier recovered by carrier track device；By the first output data At least two-way balanced device is input to, and obtains the second output data；It is carried out using the second output data as final output data defeated Go out, the second output data is input to carrier track device.Using technical solution provided in an embodiment of the present invention, as a result of Multichannel data is input to each road equalizer processes by concurrent equalizer group simultaneously, thus improves data throughput；Simultaneously as Concurrent equalizer group and the algorithm operation of carrier track device are simple, thus reduce the complexity of operation, it is seen then that the present invention is real The method and system of elimination intersymbol interference of example offer are applied while data throughput is improved, reduce the complexity of operation.
Embodiment two
Fig. 5 is a kind of structure diagram of system for eliminating intersymbol interference provided in an embodiment of the present invention, with reference to 5 institute of figure To show, system includes multiplier 101, concurrent equalizer group 102, output device 103 and carrier track device 104, wherein：
Multiplier 101 for input data to be multiplied with first carrier, obtains the first output data, first carrier is logical Cross the local carrier that carrier wave tracks of device recovers；
Concurrent equalizer group 102, the first output data for being obtained according to multiplier 101 obtain the second output data, Concurrent equalizer group 102 includes at least two-way balanced device；
Output device 103, for using the second output data that concurrent equalizer group 102 obtains as final output data into Row output；
Carrier track device 104, the second output data output first for being obtained according to concurrent equalizer group 102 carry Wave.
Further, carrier track device 104, is specifically used for：Carrier track is carried out to the second output data, and obtains the One carrier wave.
Further, concurrent equalizer group 102 is specifically used for：By multiplier obtain the first output data be divided into extremely Corresponding the first subdata of at least two-way of two-way balanced device less；At least the first subdata of two-way is input to corresponding at least two-way Balanced device；According at least equalizer coefficients of the first subdata of two-way and preset each balanced device, obtain balanced at least two-way Corresponding the second subdata of at least two-way of device；Second output data is generated according at least the second subdata of two-way.
In practical application, the renewal equation of concurrent equalizer group 102, including：
Wherein, x (Ln) it is input data, y (Ln) be the second output data Zhong No. n-th balanced devices output data, 0<n< L, W (n) are equalizer coefficients, and d (n) is tutor's sequence, e (Ln) it is error sequence, μ is iteration step length.
It should be noted that the renewal equation per balanced device all the way in concurrent equalizer group is：
Intelligible, the renewal equation per balanced device all the way in concurrent equalizer group, logical concurrent operation can push away It leads to obtain the renewal equation of concurrent equalizer group.
It should be noted that balanced device uses linear equalization, algorithm of the generally use based on gradient, for example, lowest mean square ERROR ALGORITHM (LMS, Least mean square), zero forcing algorithm, steepest descent algorithm, recursive least squares algorithm (RLS, Recursive Least Square) and various blind equalization algorithms etc..Certainly, adaptive equalizer can also use other Algorithm is realized adaptively, for example, the embodiment of the present invention does not do adaptive algorithm specific limitation.
In addition, the performance parameter of concurrent equalizer group essentially consists in the renewal equation per balanced device all the way, if the present invention is real The application scenarios for applying a kind of method of elimination intersymbol interference of example offer are mostly quasi-static channel scenario, then equalizer coefficients update Speed it is slower, therefore the performance of system is not interfered with using parallel algorithm.
You need to add is that since concurrent equalizer group includes the balanced device of at least two-way parallel connection, export every time The form of second output data can be the serial number of the parallel data of parallel output L bits or 1 bit of Serial output According to.It should be noted that the second output data can be by parallel-serial conversion come altered form.
It should be noted that the structure of concurrent equalizer group uses the design method of low latency, ensure the receipts of entire loop Holding back property.And due to by parallelization equaliser structure, higher data throughput being realized, for example, symbol stage speed is up to 300MSPS；And intersymbol interference and the influence of carrier wave frequency deviation can be overcome simultaneously, and can meet the bit error rate of rear class decoder Demand.
Further, carrier track device 104 include phase discriminator group, loop filter, accumulator and mapper, carrier wave with Track device 104 is specifically used for：
Second output data is input to phase discriminator group and obtains phase error；
Phase error is input to loop filter and obtains phase pushing figure；
Phase pushing figure is input to accumulator and obtains current carrier phase；
Current carrier phase is input to mapper and obtains first carrier.
Hereinafter, phase discriminator group, loop filter, accumulator and the mapper that carrier track device includes are illustrated, Wherein：
1st, phase discriminator can calculate output for extracting the data of the second output data, the i.e. output of concurrent equalizer group Data relative to data in ideal constellation phase error.
2nd, loop filter is used to the practical phase for sending carrier wave be become according to the phase error computation local carrier of extraction Change amount if the phase of local carrier is less than the practical phase for sending carrier wave, generates a positive phase pushing figure, if this The phase of ground carrier wave is more than the practical phase for sending carrier wave, then generates a negative phase pushing figure.
3rd, accumulator is used to obtained carrier phase offset amount obtaining current carrier phase by cumulative.
4th, mapper is used to recover first carrier, i.e. local carrier by mapping table according to current carrier phase.And lead to It crosses input multiplier to be multiplied with input data, realizes and phase place is carried out to input data.
Thus, the second output data is sequentially inputted to the phase discriminator group of carrier track device, loop filter, is tired out Add device and mapper, carrier track is carried out, and obtain first carrier to the second output data using carrier track device, that is, is restored Go out correct local carrier.
Further, the phase error extraction equation of phase discriminator group is：
Δ θ=f (y (Ln))+f(y(Ln+1))+…+f(y(Ln+L-1))
Wherein, y (Ln) be the second output data Zhong No. n-th balanced devices output data, 0<n<L, Δ θ are phase discriminator group The phase error of extraction.
Intelligible, the phase error extraction equation of the single phase discriminator in phase discriminator group is：
F (y)=- sgn (real (y)) × sgn (imag (y)) × sgn (real (y)+imag (y)) × sgn (real (y)- imag(y))
Wherein, y is the input data of the second output data, i.e. single phase discriminator in phase discriminator group, and f (y) is single mirror The phase error of phase device extraction；The phase error for obtaining phase discriminator group according to the parallelization of carrier tracking loop extracts equation.
In practical application, there are many structures of loop filter, for example, common structure shown in Fig. 3 may be used.Its In, COEFFICIENT KPWith KiIt is two key coefficients of loop filter, is respectively used to the speed and precision of control carrier track.KPWith KiThe selection of the two parameters needs to combine specific application environment, such as the size of carrier wave frequency deviation, the length of training sequence, leads to The method for crossing emulation calculates its reference value.Certainly, the embodiment of the present invention does not limit the concrete form of the structure of loop filter It is fixed.
Intersymbol interference system is eliminated an embodiment of the present invention provides a kind of, by the way that input data is multiplied with first carrier, The first output data is obtained, first carrier is the local carrier recovered by carrier track device；First output data is defeated Enter at least two-way concurrent equalizer, and obtain the second output data；It is carried out the second output data as final output data Second output data is input to carrier track device by output.Using technical solution provided in an embodiment of the present invention, due to using Multichannel data is input to each road equalizer processes by concurrent equalizer group simultaneously, thus improves data throughput；Meanwhile by It is simple in the operation of the algorithm of concurrent equalizer group and carrier track device, thus reduce the complexity of operation, it is seen then that the present invention The system of elimination intersymbol interference that embodiment provides reduces the complexity of operation while data throughput is improved.
In practical applications, in order to make whole system after iteration several times, convergence state can be reached, needed initial During operation, an initial input data is inputted.Specifically, it is using the form of input data as [training sequence transmits data] Example illustrates.Wherein, training sequence is one section of known array, for equalizer coefficients to be made to converge to a relatively stable shape State, the data amount check of training sequence is 400, and for plural number, the value of real and imaginary parts is all represented each data of transmitting with 8bit, is worth It is 32 or -32.The original state of setting system is：For concurrent equalizer group by taking two-way is parallel as an example, equalizer coefficients are [0 00 0000010000000 0], original carrier phase is set as 0 or is provided by prime capturing carrier module, ring The parameter K of path filterPIt is 64, with KiIt is 1, system uses quadrature phase shift keying (QPSK, Quadrature Phase Shift Keying modulation system) there are the carrier wave frequency deviation of 10PPM, works in the case of the channel for having sighting distance.
System in the process of running, handles the training sequence that data amount check is 400 so that equalizer coefficients converge to first One relatively stable state, carrier track device obtain an accurate carrier phase, i.e. system is in one and stablizes relatively State；Then, reprocess real data, due to wireless channel be dynamically, when handling real data, balanced device Meeting trim equalizer coefficient always is organized, constantly the balanced channel that vary, and carrier track device then tracks carrier phase.
In addition, it is necessary to explanation, elimination intersymbol interference system provided in an embodiment of the present invention is needed in actual motion Processing before input Jing Guo prime module needs the processing by post-module (for example, decoder) after output.It is optional , it can also increase a digital resources obtainment between prime module and elimination intersymbol interference system provided by the invention (AGC, Automatic Gain Control) module, for the amplitude of input data to be controlled to rise and fall, such as by data amplitude control System is 32 or so.
By the simulation run to real system, elimination intersymbol interference system provided in an embodiment of the present invention is tested Card.Specifically, Fig. 6 shows the carrier phase figure recovered when there is frequency deviation, it can be seen that due to carrier wave, there are 10PPM's Carrier wave frequency deviation, therefore, the carrier phase that carrier track device obtains are linear.Fig. 7 shows ber curve comparison signal Figure, wherein, dotted curve represents the output performance of prime module (RAKE)；Round curve represents provided in an embodiment of the present invention Eliminate the output performance of intersymbol interference system；Square shape curve represents the output performance of post-module；Triangle curve represents QPSK is modulated at the theoretical error code curve under Gaussian white noise channel.It can be seen from figure 7 that due to the influence of carrier wave frequency deviation, The output error rate of prime module is 50%, i.e., almost completely wrong.But through and showing that elimination intersymbol provided in an embodiment of the present invention is done After disturbing system processing, carrier wave frequency deviation and intersymbol interference are eliminated, and performance, which has, to be obviously improved.With the increasing of signal-to-noise ratio Add, the bit error rate is in the trend that is decreased obviously, and after being sent into post-module, post-module also can correctly work, and obtain apparent volume Code gain, in practice, can obtain under 10dB better than 10-5Error performance.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program Product.Therefore, the shape of the embodiment in terms of hardware embodiment, software implementation or combination software and hardware can be used in the present invention Formula.Moreover, the present invention can be used can use storage in one or more computers for wherein including computer usable program code The form of computer program product that medium is implemented on (including but not limited to magnetic disk storage and optical memory etc.).
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided The processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices is generated for real The device of function specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works so that the instruction generation being stored in the computer-readable memory includes referring to Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or The function of being specified in multiple boxes.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted Series of operation steps are performed on calculation machine or other programmable devices to generate computer implemented processing, so as in computer or The instruction offer performed on other programmable devices is used to implement in one flow of flow chart or multiple flows and/or block diagram one The step of function of being specified in a box or multiple boxes.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.

Claims (10)

  1. A kind of 1. method for eliminating intersymbol interference, which is characterized in that the method includes：
    Input data with first carrier is multiplied, obtains the first output data, the first carrier is passes through carrier track device The local carrier recovered；
    First output data is input at least two-way balanced device, and obtain the second output data；
    Second output data as final output data is exported, second output data is input to the load Wave tracks of device.
  2. 2. according to the method described in claim 1, it is characterized in that, in the acquisition that input data is multiplied with first carrier Before one output data, the method further includes：
    Carrier track is carried out, and obtain the first carrier to second output data using the carrier track device.
  3. 3. according to the method described in claim 1, it is characterized in that, described be input at least two-way by first output data Balanced device, and the second output data is obtained, it specifically includes：
    First output data is divided into the first subdata of at least two-way corresponding at least two-way balanced device；
    First subdata of at least two-way is input to the corresponding at least two-way balanced device；
    According to first subdata of at least two-way and the equalizer coefficients of preset each balanced device, obtain with it is described extremely Corresponding the second subdata of at least two-way of two-way balanced device less；
    Second output data is generated according to second subdata of at least two-way.
  4. 4. according to the method described in claim 2, it is characterized in that, the carrier track device includes phase discriminator group, loop is filtered Wave device, accumulator and mapper, it is described that carrier track is carried out simultaneously to second output data using the carrier track device The first carrier is obtained, is specifically included：
    Second output data is input to the phase discriminator group and obtains phase error；
    The phase error is input to the loop filter and obtains phase pushing figure；
    The phase pushing figure is input to the accumulator and obtains current carrier phase；
    The current carrier phase is input to the mapper and obtains the first carrier.
  5. 5. according to the method described in claim 4, it is characterized in that, the phase error extraction equation of the phase discriminator group is：
    Δ θ=f (y (Ln))+f(y(Ln+1))+…+f(y(Ln+L-1))
    Wherein, the y (Ln) be the second output data Zhong No. n-th balanced device output data, described 0<n<L, the Δ θ is the phase error of phase discriminator group extraction.
  6. 6. a kind of system for eliminating intersymbol interference, which is characterized in that the system comprises multiplier, concurrent equalizer group, outputs Device and carrier track device, wherein：
    The multiplier for input data to be multiplied with first carrier, obtains the first output data, the first carrier is logical Cross the local carrier that the carrier track device recovers；
    The concurrent equalizer group, first output data for being obtained according to the multiplier obtain the second output number According to the concurrent equalizer group includes at least two-way balanced device；
    The output device, for second output data that obtains the concurrent equalizer group as final output data It is exported；
    The carrier track device, for second output data output described the obtained according to the concurrent equalizer group One carrier wave.
  7. 7. system according to claim 6, which is characterized in that the carrier track device is specifically used for：
    Carrier track is carried out, and obtain the first carrier to second output data.
  8. 8. system according to claim 6, which is characterized in that the concurrent equalizer group is specifically used for：
    First output data that the multiplier obtains is divided into and at least two-way balanced device corresponding at least two The first subdata of road；First subdata of at least two-way is input to the corresponding at least two-way balanced device；According to described At least equalizer coefficients of the first subdata of two-way and preset each balanced device obtain and at least two-way balanced device Corresponding the second subdata of at least two-way；Second output data is generated according to second subdata of at least two-way.
  9. 9. system according to claim 7, which is characterized in that the carrier track device includes phase discriminator group, loop is filtered Wave device, accumulator and mapper, the carrier track device, are specifically used for：
    Second output data is input to the phase discriminator group and obtains phase error；
    The phase error is input to the loop filter and obtains phase pushing figure；
    The phase pushing figure is input to the accumulator and obtains current carrier phase；
    The current carrier phase is input to the mapper and obtains the first carrier.
  10. 10. system according to claim 9, which is characterized in that the phase error of the phase discriminator group extracts equation and is：
    Δ θ=f (y (Ln))+f(y(Ln+1))+…+f(y(Ln+L-1))
    Wherein, the y (Ln) be the second output data Zhong No. n-th balanced device output data, described 0<n<L, the Δ θ is the phase error of phase discriminator group extraction.
CN201611091716.2A 2016-12-01 2016-12-01 A kind of method and system for eliminating intersymbol interference Withdrawn CN108134752A (en)

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Citations (4)

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Publication number Priority date Publication date Assignee Title
WO2002089371A8 (en) * 2001-04-27 2003-02-27 Hughes Electronics Corp Power division multiplexing with incoherent signals and fixed powder hierarchy
CN1954569A (en) * 2004-05-12 2007-04-25 汤姆森许可公司 Carrier recovery architecture with improved acquisition
CN1996976A (en) * 2006-11-20 2007-07-11 华为技术有限公司 A method and system for elimination of the multi-path interference and carry frequency deviation
CN102420790A (en) * 2011-11-28 2012-04-18 清华大学 Equalization processing method in single carrier ultra wide band communication system and system thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002089371A8 (en) * 2001-04-27 2003-02-27 Hughes Electronics Corp Power division multiplexing with incoherent signals and fixed powder hierarchy
CN1954569A (en) * 2004-05-12 2007-04-25 汤姆森许可公司 Carrier recovery architecture with improved acquisition
CN1996976A (en) * 2006-11-20 2007-07-11 华为技术有限公司 A method and system for elimination of the multi-path interference and carry frequency deviation
CN102420790A (en) * 2011-11-28 2012-04-18 清华大学 Equalization processing method in single carrier ultra wide band communication system and system thereof

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