WO2018099162A1

WO2018099162A1 - Method and system for eliminating inter-symbol interference, and storage medium

Info

Publication number: WO2018099162A1
Application number: PCT/CN2017/102527
Authority: WO
Inventors: 栾志斌
Original assignee: 深圳市中兴微电子技术有限公司
Priority date: 2016-12-01
Filing date: 2017-09-20
Publication date: 2018-06-07
Also published as: CN108134752A

Abstract

Disclosed in an embodiment of the present invention are a method and system for eliminating inter-symbol interference, and a storage medium. The method comprises: based on input data and a first carrier, obtaining first output data, wherein the first carrier is a local carrier formed after processing the output data; inputting the first output data to at least two paths of equalizers, and obtaining second output data; and outputting the second output data as final output data.

Description

Method, system and storage medium for eliminating inter-symbol interference

Cross-reference to related applications

The present application is filed on the basis of the Chinese Patent Application No. No. No. No. No. No. No. No. No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No

Technical field

The present invention relates to the field of communications, and in particular, to a method, system, and storage medium for eliminating inter-symbol interference.

Background technique

At present, the transmission rate and signal bandwidth of short-range wireless communication are getting higher and higher, and due to channel-intensive multipath delay, severe inter-symbol interference is often caused. Therefore, an adaptive equalizer is needed to eliminate inter-symbol interference.

The existing equalizer design method usually recovers the correct carrier through carrier tracking, and then performs equalization processing through the equalizer. Specifically, existing equalizers include many types, such as decision feedback equalization (DFE) and single carrier frequency domain equalization (SC-FDE). The DFE uses the information of the previous decision symbol to make a decision on the next symbol. The function of the feedback is to feed the previous correct symbol into the feedforward to eliminate the intersymbol interference caused by the previous detection symbol, thereby determining the next symbol; SC- FDE uses the idea of cyclic prefix in Orthogonal Frequency Division Multiplexing (OFDM) to add a cyclic prefix at the origin to overcome the interference between data blocks, and convert the linear convolution into circular convolution using the cyclic prefix. By using the diagonalizable characteristics of the channel cyclic matrix, a simple Fast Fourier Transformation (FFT) and an Inverse Fast Fourier Transform (IFFT) are used at the receiving end to equalize the channel.

However, the existing DFE has a lower data throughput rate due to the existence of a feedback loop; SC-FDE has a high computational complexity. That is to say, the existing method for eliminating inter-symbol interference cannot improve the data throughput rate and reduce the computational complexity.

Summary of the invention

In order to solve the above technical problem, embodiments of the present invention are expected to provide a method, system, and storage medium for eliminating inter-symbol interference, which can reduce the complexity of computation while improving data throughput.

The technical solution of the present invention is implemented as follows:

In a first aspect, an embodiment of the present invention provides a method for eliminating inter-symbol interference, where the method includes:

Obtaining first output data based on the input data and the first carrier, where the first carrier is a local carrier formed by processing the first output data;

Inputting the first output data to at least two equalizers, and obtaining the second output data;

The second output data is output as final output data.

In the above solution, before the input data is multiplied by the first carrier to obtain the first output data, the method further includes:

The second tracking data is tracked by the carrier tracking device, and the first carrier is obtained.

Further, the first output data is input to the at least two equalizers, and the second output data is obtained, including:

Dividing the first output data into at least two first sub-data corresponding to the at least two equalizers;

Inputting at least two first sub-data into the corresponding at least two equalizers;

Obtaining at least two second sub-data corresponding to the at least two equalizers according to the at least two first sub-data and the preset equalizer coefficients of the equalizers;

Generating second output data based on at least two second sub-data.

In the above solution, the carrier tracking device includes a phase detector group, a loop filter, an accumulator, and a mapper, and performs carrier tracking on the second output data by using the carrier tracking device to obtain the first carrier, including:

Inputting the second output data to the phase detector group to obtain a phase error;

Inputting a phase error to the loop filter to obtain a phase offset;

Inputting the phase offset to the accumulator to obtain the current carrier phase;

The current carrier phase is input to the mapper to obtain the first carrier.

In the above scheme, the phase error extraction equation of the phase detector group is:

Δθ=f(y(L _n ))+f(y(L _n+1 ))+...f(y(L _n+L-1 ))

Where y(L _n ) is the data output by the nth equalizer in the second output data, 0<n<L, Δθ is the phase error extracted by the phase detector group.

In a second aspect, an embodiment of the present invention provides a system for eliminating inter-symbol interference, where the system includes a multiplier, a parallel equalizer group, an output device, and a carrier tracking device, where:

a multiplier configured to obtain first output data based on the input data and the first carrier, where the first carrier is a local carrier formed by processing the first output data;

a parallel equalizer group configured to obtain second output data according to the first output data obtained by the multiplier, the parallel equalizer group comprising at least two equalizers;

An output device configured to output the second output data obtained by the parallel equalizer group as final output data;

The carrier tracking device is configured to output the first carrier according to the second output data obtained by the parallel equalizer group.

In the above solution, the carrier tracking device is configured to:

Carrier tracking is performed on the second output data, and the first carrier is obtained.

In the above solution, the parallel equalizer group is configured as:

Dividing the first output data obtained by the multiplier into at least two first sub-data corresponding to the at least two equalizers; inputting at least two first sub-data into the corresponding at least two equalizers; according to at least two paths a sub-data, and preset equalizer coefficients of each equalizer, obtaining at least two second sub-data corresponding to at least two equalizers; generating a second according to at least two second sub-data Output Data.

In the above solution, the carrier tracking device includes a phase detector group, a loop filter, an accumulator, and a mapper, and the carrier tracking device is configured to:

Inputting a phase error to the loop filter to obtain a phase offset;

The current carrier phase is input to the mapper to obtain the first carrier.

Further, the phase error extraction equation of the phase detector group is:

_{Δθ = f (y (L n} )) + f (y (L n + 1)) + ... f (y (L n + L-1))

In a third aspect, an embodiment of the present invention provides a storage medium, where an executable program is stored, and when the executable program is executed by a processor, the foregoing method for eliminating inter-symbol interference is implemented.

The embodiment of the invention provides a method, a system and a storage medium for eliminating inter-symbol interference. The first output data is obtained by multiplying input data by a first carrier, and the first carrier is a local carrier recovered by the carrier tracking device. Transmitting the first output data to the at least two equalizers and obtaining the second output data; outputting the second output data as the final output data, and inputting the second output data to the carrier tracking device. According to the technical solution provided by the embodiment of the present invention, since the equalizer group including at least two equalizers is used to simultaneously process the multiplexed data, the data throughput rate is improved; and at the same time, due to the parallel equalizer group and the carrier tracking device The algorithm is simple in operation and thus reduces the complexity of the operation. It can be seen that the method and system for eliminating inter-symbol interference provided by the embodiments of the present invention reduce the complexity of the operation while improving the data throughput rate.

DRAWINGS

1 is a schematic flowchart 1 of a method for eliminating inter-symbol interference according to an embodiment of the present invention;

2 is a schematic flowchart 2 of a method for eliminating inter-symbol interference according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a loop filter according to an embodiment of the present disclosure;

4 is a schematic structural diagram 1 of an inter-symbol interference cancellation system according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram 2 of an inter-symbol interference cancellation system according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a carrier phase recovered when there is a frequency offset according to an embodiment of the present invention; FIG.

FIG. 7 is a schematic diagram of comparison of a bit error rate curve according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings.

Embodiment 1

FIG. 1 is a schematic flowchart of a method for eliminating inter-symbol interference according to an embodiment of the present invention. Referring to FIG. 1, the method includes:

Step 101: Obtain first output data based on the input data and the first carrier, where the first carrier is a local carrier that processes the first output data.

In practical applications, the input data is usually complex data, so multiplying the input data by the first carrier can be implemented by a complex multiplier.

It can be understood that by obtaining the first output data by multiplying the input data by the first carrier, the influence of the carrier frequency offset can be eliminated.

Exemplarily, referring to FIG. 2, before the step 101, the method further includes a step 100, wherein the step 100 is specifically:

Step 100: Perform carrier tracking on the second output data by using a carrier tracking device, and obtain a first carrier.

It should be noted that carrier tracking is usually used to recover the correct carrier, thereby solving the problem of carrier frequency offset.

Further, the carrier tracking device includes a phase detector group, a loop filter, an accumulator, and a mapper, and the step 100 includes a step 1001 to a step 1004, wherein the steps 1001 to 1004 have The body is as follows:

Step 1001: Input a second output data to a phase detector group to obtain a phase error.

Step 1002: Input a phase error into a loop filter to obtain a phase offset.

Step 1003: Input a phase offset to the accumulator to obtain a current carrier phase.

Step 1004: Input the current carrier phase to the mapper to obtain the first carrier.

Hereinafter, a phase detector group, a loop filter, an accumulator, and a mapper included in the carrier tracking device will be described, wherein:

1. The phase detector is configured to extract the second output data, that is, the data output by the parallel equalizer group, and can calculate the phase error of the output data relative to the data in the ideal constellation.

2. The loop filter is configured to calculate the phase change amount of the local carrier and the actual transmission carrier according to the extracted phase error, and if the phase of the local carrier is smaller than the phase of the actual transmission carrier, a positive phase offset is generated, if the local carrier A phase greater than the phase of the actual transmitted carrier produces a negative phase offset.

3. The accumulator is configured to obtain the current carrier phase by accumulating the obtained carrier phase offset.

4. The mapper is configured to recover the first carrier, that is, the local carrier, through the mapping table according to the current carrier phase. The input data is phase-rotated by multiplying the input data by an input multiplier.

In this way, the second output data is sequentially input to the phase detector group, the loop filter, the accumulator and the mapper of the carrier tracking device, and the second tracking data is tracked by the carrier tracking device, and the first carrier is obtained. , that is, the correct local carrier is recovered.

Preferably, the phase error extraction equation of the phase detector group is as shown in the following formula (1):

Δθ=f(y(L _n ))+f(y(L _n+1 ))+...f(y(L _n+L-1 )) (1)

It can be understood that the phase error extraction equation of a single phase detector in the phase detector group is as shown in the following formula (2):

f(y)=-sgn(real(y))×sgn(imag(y))×sgn(real(y)+imag(y))×sgn(real(y)-imag(y))(2)

Where y is the second output data, that is, the input data of a single phase detector in the phase detector group, f(y) is the phase error extracted by the single phase detector; and the phase discrimination is obtained according to the parallelization of the carrier tracking loop The phase error extraction equation of the group.

In practical applications, the structure of the loop filter is various. For example, the common structure shown in FIG. 3 can be employed. Among them, the coefficients k _p and k _i are two key coefficients of the loop filter, which are used to control the speed and accuracy of carrier tracking, respectively. The selection of the two parameters K _P and K _i needs to be combined with the specific application environment, such as the size of the carrier frequency offset, the length of the training sequence, etc., and the reference value is calculated by the simulation method. Certainly, the specific form of the structure of the loop filter is not limited in the embodiment of the present invention.

Step 102: Input the first output data to at least two equalizers, and obtain second output data.

It should be noted that the first output data may be input to at least two equalizers through a parallel equalizer group, wherein the parallel equalizer group includes at least two equalizers. A parallel equalizer group is used to dynamically estimate changes in the wireless channel to eliminate intersymbol interference. Inputting the first output data to the parallel equalizer group can solve the problem of inter-symbol interference.

It can be understood that the parallel equalizer group includes at least two equalizers, that is, the first output data is respectively input to each equalizer in the parallel equalizer group. Specifically, FIG. 4 shows a schematic structural diagram of the inter-symbol interference cancellation system. Referring to FIG. 4, the first output data is divided into at least two paths, that is, X[L _n : L _n+L-1 ], and the data X[L _n ] Input the first equalizer, the data X[L _n+1 ] is input to the second equalizer, and so on, and the data X[L _n+L-1 ] is input to the L _-th equalizer. It can be seen that by parallelizing the structure of the equalizer group, parallel processing of data can be realized, thereby improving data throughput.

Further, the step 102 includes: dividing the first output data into at least two first sub-data corresponding to the at least two equalizers; and inputting at least two first sub-data into the corresponding at least two equalizers; At least two first sub-data, and a preset equalizer of each equalizer And obtaining at least two second sub-data corresponding to the at least two equalizers; and generating second output data according to the at least two second sub-data.

In practice, at least two equalizers can be implemented by a parallel equalizer group, wherein the update equation of the parallel equalizer group is as shown in the following formula (3):

Where x(L _n ) is the input data, and y(L _n ) is the data output by the nth equalizer in the second output data, 0<n<L, W(n) is the equalizer coefficient, d(n) ) is the mentor sequence, e(L _n ) is the error sequence, and μ is the iteration step size.

It should be noted that the update equation of each equalizer in the parallel equalizer group is as shown in the following formula (4):

It can be understood that the parallel parallel operation can derive the update equation of the parallel equalizer group according to the update equation of each equalizer in the parallel equalizer group.

It should be noted that the equalizer adopts linear equalization, and usually adopts a gradient-based algorithm, for example, a least mean square error algorithm (LMS), a zero-forcing algorithm, a steepest descent algorithm, and a recursive least squares algorithm (RLS). , Recursive Least Square), and various blind equalization algorithms. Of course, the adaptive equalizer can also be adaptive by other algorithms, for example, this The embodiment of the invention does not impose any specific limitation on the adaptive algorithm.

In addition, the performance parameter of the parallel equalizer group is mainly in the update equation of each equalizer. If the application scenario of the method for eliminating inter-symbol interference provided by the embodiment of the present invention is mostly a quasi-static channel scenario, the equalizer coefficient is updated. The speed is slow, so using parallel algorithms does not affect the performance of the system.

It should be added that since the parallel equalizer group includes at least two parallel equalizers, the output of the second output data may be parallel output L-bit parallel data or serial output 1-bit string. Row data. It should be noted that the second output data can be changed in form by parallel conversion.

It should be noted that the structure of the parallel equalizer group adopts a low-latency design method to ensure the convergence of the entire loop. And because of the parallelized equalizer structure, high data throughput rate is achieved, for example, the symbol level rate is up to 300 MSPS; and the effects of inter-symbol interference and carrier frequency offset can be overcome at the same time, and the error of the latter stage decoder can be satisfied. Rate requirement.

Step 103: Output the second output data as final output data.

In practical applications, the second output data is input to the carrier tracking device so that after several iterations, the entire system can reach a convergence state, that is, the final output data has neither carrier frequency offset nor inter-symbol interference.

It can be understood that the second output data output by the parallel equalizer group is outputted for the final output data, and is also used for inputting to the carrier tracking device to extract the current carrier phase error, so that the carrier tracking device outputs the first carrier, thereby making the whole The system forms a loop.

In the practical application, the streaming chip is performed under the process of TSMC 0.13 um, and the result shows that the power consumption of the method for eliminating inter-symbol interference is only 12.4 mW and the symbol rate is 300 MSPS. That is to say, according to the result of the practice verification, the method for eliminating inter-symbol interference provided by the embodiment of the present invention can improve the throughput rate and the error performance, and save power consumption.

Embodiments of the present invention provide a method for eliminating inter-symbol interference, based on input data and first a carrier, obtaining a first output data, the first carrier is a local carrier formed by processing the first output data; inputting the first output data to at least two equalizers, and obtaining second output data; using the second output data as The final output data is output, and the second output data is input to the carrier tracking device. According to the technical solution provided by the embodiment of the present invention, since the parallel equalizer group is used to simultaneously input multiple data into each equalizer, the data throughput rate is improved; and at the same time, the algorithm of the parallel equalizer group and the carrier tracking device is adopted. The operation is simple, and thus the complexity of the operation is reduced. It can be seen that the method and system for eliminating inter-symbol interference provided by the embodiments of the present invention reduce the complexity of the operation while improving the data throughput rate.

Embodiment 2

FIG. 5 is a schematic structural diagram of a system for eliminating inter-symbol interference according to an embodiment of the present invention. Referring to FIG. 5, the system includes a multiplier 101, a parallel equalizer group 102, an output device 103, and a carrier tracking device 104, where:

The multiplier 101 is configured to obtain first output data based on the input data and the first carrier, where the first carrier is a local carrier formed by processing the first output data;

The parallel equalizer group 102 is configured to obtain second output data according to the first output data obtained by the multiplier 101, and the parallel equalizer group 102 includes at least two equalizers;

The output device 103 is configured to output the second output data obtained by the parallel equalizer group 102 as final output data;

The carrier tracking device 104 is configured to output a first carrier based on the second output data obtained by the parallel equalizer group 102.

Further, the carrier tracking device 104 is configured to: perform carrier tracking on the second output data, and obtain a first carrier.

Further, the parallel equalizer group 102 is configured to: divide the first output data obtained by the multiplier into at least two first sub-data corresponding to the at least two equalizers; input at least two first sub-data into the corresponding At least two equalizers; according to at least two first data, and preset The equalizer coefficients of each equalizer obtain at least two second sub-data corresponding to the at least two equalizers; and generate second output data according to the at least two second sub-data.

In practical applications, the update equation of the parallel equalizer group 102 is as shown in the following formula (3), including:

It should be noted that the equalizer adopts linear equalization, and generally adopts a gradient-based algorithm, for example, an LMS, a zero-forcing algorithm, a steepest descent algorithm, an RLS, and various blind equalization algorithms. Of course, the adaptive equalizer can also implement the adaptation by using other algorithms. For example, the embodiment of the present invention does not specifically limit the adaptive algorithm.

Further, the carrier tracking device 104 includes a phase detector group, a loop filter, an accumulator, and a mapper, and the carrier tracking device 104 is configured to:

Inputting a phase error to the loop filter to obtain a phase offset;

The current carrier phase is input to the mapper to obtain the first carrier.

2. The loop filter is configured to calculate the phase change amount of the local carrier and the actual transmission carrier according to the extracted phase error, and if the phase of the local carrier is smaller than the phase of the actual transmission carrier, a positive phase offset is generated, if the local carrier If the phase is greater than the phase of the actual transmitted carrier, then the phase is produced. Generate a negative phase offset.

Further, the phase error extraction equation of the phase detector group is as shown in the following formula (1):

Δθ=f(y(L _n ))+f(y(L _n+1 ))+...f(y(L _n+L-1 )) (1)

Wherein, y (L _n) is the output data of the second data path in the n-th output of the equalizer, 0 <n <L, Δθ is the phase error extracted by the phase detector group.

f(y)=-sgn(real(y))×sgn(imag(y))×sgn(real(y)+imag(y))×sgn(real(y)-imag(y))(2)

In practical applications, the structure of the loop filter is various. For example, the common structure shown in FIG. 3 can be employed. Among them, the coefficients K _P and K _i are two key coefficients of the loop filter, which are used to control the speed and accuracy of carrier tracking. The selection of the two parameters K _P and K _i needs to be combined with the specific application environment, such as the size of the carrier frequency offset, the length of the training sequence, etc., and the reference value is calculated by the simulation method. Certainly, the specific form of the structure of the loop filter is not limited in the embodiment of the present invention.

An embodiment of the present invention provides an inter-symbol interference cancellation system, which obtains first output data by multiplying input data by a first carrier, where the first carrier is a recovered by a carrier tracking device. Ground carrier; inputting first output data to at least two parallel equalizers and obtaining second output data; outputting the second output data as final output data, and inputting the second output data to the carrier tracking device. According to the technical solution provided by the embodiment of the present invention, since the parallel equalizer group is used to simultaneously input multiple data into each equalizer, the data throughput rate is improved; and at the same time, the algorithm of the parallel equalizer group and the carrier tracking device is adopted. The operation is simple, and thus the complexity of the operation is reduced. It can be seen that the system for eliminating inter-symbol interference provided by the embodiment of the present invention reduces the complexity of the operation while improving the data throughput rate.

In practical applications, in order to make the whole system reach a convergence state after several iterations, an initial input data needs to be input during the initial calculation. Specifically, the format of the input data is [training sequence, transmission data] as an example. The training sequence is a known sequence, which is used to converge the equalizer coefficients to a relatively stable state. The number of data in the training sequence is 400, and each transmitted data is a complex number, and the values of the real part and the imaginary part are used. 8bit means that the value is 32 or -32. Set the initial state of the system to: Parallel equalizer group in two way and behavior example, the equalizer coefficient is [0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0], the initial carrier phase is set to 0 or by The pre-stage carrier acquisition module gives that the parameter K _P of the loop filter is 64, and K _i is 1. The system adopts the modulation mode of quadrature phase shift keying (QPSK), and there is a carrier frequency of 10 PPM. Partial, working with channels with line of sight.

During the operation of the system, the training sequence with 400 data is processed first, so that the equalizer coefficients converge to a more stable state, and the carrier tracking device obtains a more accurate carrier phase, that is, the system is in a relatively stable state; The actual data is processed again. Since the wireless channel is dynamic, when processing the actual data, the equalizer group will always fine-tune the equalizer coefficients, constantly equalizing the changed channels, and the carrier tracking device tracks the carrier phase.

In addition, it should be noted that, in the actual operation, the inter-code interference cancellation system provided by the embodiment of the present invention needs to be processed by the pre-stage module before input, and needs to pass through the post-stage module (for example, a decoder) after the output. deal with. Optionally, between the pre-stage module and the cancellation code provided by the present invention A digital automatic gain control (AGC) module can also be added between the interference systems to control the amplitude fluctuation of the input data, for example, to control the data amplitude to about 32.

The inter-symbol interference cancellation system provided by the embodiment of the present invention is verified by the simulation operation of the actual system. Specifically, FIG. 6 shows a carrier phase diagram recovered when there is a frequency offset. It can be seen that since the carrier has a carrier frequency offset of 10 PPM, the carrier phase obtained by the carrier tracking device is linear. FIG. 7 is a schematic diagram showing a comparison of bit error rate curves, wherein the dot curve represents the output performance of the pre-stage module (RAKE); the circular shape curve represents the output performance of the inter-symbol interference system provided by the embodiment of the present invention; Indicates the output performance of the latter module; the triangular shape curve represents the theoretical error curve of QPSK modulation under the Gaussian white noise channel. It can be seen from FIG. 7 that due to the influence of the carrier frequency offset, the output error rate of the pre-stage module is 50%, that is, almost completely wrong. However, after the inter-symbol interference system provided by the embodiment of the present invention is processed, the carrier frequency offset and the inter-code interference are eliminated, and the performance is significantly improved. With the increase of signal-to-noise ratio, the bit error rate shows a significant downward trend. After being sent to the latter module, the latter module can work correctly and obtain obvious coding gain. In practice, it can be better than 10 at 10dB. ^-5 error performance.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

In the embodiment of the present invention, if the data consistency detection method of the primary and secondary databases and/or the data consistency restoration method of the primary and secondary databases are implemented in the form of software function modules, and are sold or used as independent products, they may also be stored in one The computer can read the storage medium. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium. In the meantime, a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the methods described in various embodiments of the present invention. The foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read only memory (ROM), a magnetic disk, or an optical disk. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

Correspondingly, an embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores a computer program, and the computer program is used to execute the foregoing method for eliminating inter-symbol interference in the embodiment of the present invention.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Industrial applicability

In the embodiment of the present invention, the first output data is obtained based on the input data and the first carrier, where the first carrier is a local carrier formed by processing the first output data; and the first output data is input to at least two The equalizer obtains the second output data; and outputs the second output data as the final output data. Since the equalizer group including at least two equalizers is used to simultaneously process the multiplexed data, the data throughput rate is improved. At the same time, the algorithm of the parallel equalizer group and the carrier tracking device is simple to operate, thereby reducing the complexity of the operation. It can be seen that the method, system and storage medium for eliminating inter-symbol interference provided by the embodiments of the present invention reduce the complexity of the operation while improving the data throughput rate.

Claims

A method of eliminating inter-symbol interference, the method comprising:

Obtaining, according to the input data and the first carrier, the first output data, where the first carrier is a local carrier formed by processing the first output data;

Inputting the first output data to at least two equalizers, and obtaining second output data;

The second output data is output as final output data.
The method of claim 1, wherein before the obtaining the first output data based on the input data and the first carrier, the method further comprises:

Carrier tracking is performed on the output data, and the first carrier is obtained.
The method of claim 1, wherein the inputting the first output data to at least two equalizers and obtaining the second output data comprises:

Dividing the first output data into at least two first sub-data corresponding to the at least two equalizers;

Inputting the at least two first sub-data into the corresponding at least two equalizers;

Obtaining at least two second sub-data corresponding to the at least two equalizers according to the at least two first sub-data and the preset equalizer coefficients of each of the equalizers;

Generating the second output data according to the at least two second sub-data.
The method according to claim 2, wherein said carrier tracking means comprises a phase detector group, a loop filter, an accumulator and a mapper, said carrier of said second output data being carried by said carrier tracking means Tracking and obtaining the first carrier, including:

Inputting the second output data to the phase detector group to obtain a phase error;

Inputting the phase error to the loop filter to obtain a phase offset;

Inputting the phase offset to the accumulator to obtain a current carrier phase;

The current carrier phase is input to the mapper to obtain the first carrier.
The method of claim 4 wherein the phase error of the phase detector group is raised Take the equation as:

Δθ=f(y(L n ))+f(y(L n+1 ))+...f(y(L n+L-1 ))

The y(L n ) is data output by the nth equalizer in the second output data, where 0<n<L, and the Δθ is a phase error extracted by the phase detector group.
A system for eliminating intersymbol interference, the system comprising a multiplier, a parallel equalizer group, an output device, and a carrier tracking device, wherein:

The multiplier is configured to obtain first output data based on multiplication of the input data and the first carrier, where the first carrier is a local carrier formed by processing the first output data;

The parallel equalizer group is configured to obtain second output data according to the first output data obtained by the multiplier, the parallel equalizer group comprising at least two equalizers;

The output device is configured to output the second output data obtained by the parallel equalizer group as final output data;

The carrier tracking device is configured to output the first carrier according to the second output data obtained by the parallel equalizer group.
The system of claim 6, wherein the carrier tracking device is configured to:

Performing carrier tracking on the second output data, and obtaining the first carrier.
The system of claim 6 wherein said parallel equalizer group is configured to:

And dividing the first output data obtained by the multiplier into at least two first sub-data corresponding to the at least two equalizers; and inputting the at least two first sub-data into the corresponding at least a two-way equalizer; obtaining at least two second sub-data corresponding to the at least two equalizers according to the at least two first sub-data and the preset equalizer coefficients of each of the equalizers; The at least two second sub-data generates the second output data.
The system of claim 7 wherein said carrier tracking means comprises a phase detector set, a loop filter, an accumulator and a mapper, said carrier tracking means being configured to:

Inputting the second output data to the phase detector group to obtain a phase error;

Inputting the phase error to the loop filter to obtain a phase offset;

Inputting the phase offset to the accumulator to obtain a current carrier phase;

The current carrier phase is input to the mapper to obtain the first carrier.
The system of claim 9 wherein the phase error extraction equation of said phase detector group is:

Δθ=f(y(L n ))+f(y(L n+1 ))+...f(y(L n+L-1 ))

The y(L n ) is data output by the nth equalizer in the second output data, where 0<n<L, and the Δθ is a phase error extracted by the phase detector group.
A storage medium storing an executable program, the executable program being executed by a processor, the method for canceling inter-symbol interference according to any one of claims 1 to 5.