CN109391575A - Time-domain signal preprocess method and device, readable storage medium storing program for executing, receiver - Google Patents
Time-domain signal preprocess method and device, readable storage medium storing program for executing, receiver Download PDFInfo
- Publication number
- CN109391575A CN109391575A CN201710673398.9A CN201710673398A CN109391575A CN 109391575 A CN109391575 A CN 109391575A CN 201710673398 A CN201710673398 A CN 201710673398A CN 109391575 A CN109391575 A CN 109391575A
- Authority
- CN
- China
- Prior art keywords
- sample rate
- cyclic prefix
- sampling
- sampled point
- time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/14—Fourier, Walsh or analogous domain transformations, e.g. Laplace, Hilbert, Karhunen-Loeve, transforms
- G06F17/141—Discrete Fourier transforms
- G06F17/142—Fast Fourier transforms, e.g. using a Cooley-Tukey type algorithm
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Data Mining & Analysis (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Discrete Mathematics (AREA)
- Databases & Information Systems (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Algebra (AREA)
- Analogue/Digital Conversion (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
A kind of time-domain signal preprocess method and device, readable storage medium storing program for executing, receiver, the described method includes: carrying out analog-to-digital conversion to the signal received, to obtain digital signal, the signal received includes cyclic prefix and data, the first sampled point that the first sampled point and data that digital signal, which includes cyclic prefix, to be obtained in the first sample rate down-sampling are obtained in the first sample rate down-sampling；Before carrying out down-sampling to digital signal using the second sample rate, according to the ratio of the first sample rate and second sample rate, a part of the first sampled point of cyclic prefix is lost；Down-sampling is carried out to the digital signal after losing operation using the second sample rate, and removes the second sampled point that cyclic prefix is obtained in the second sample rate down-sampling；Time-frequency conversion is carried out to the signal after removal cyclic prefix, to obtain frequency domain data.Technical solution of the present invention can realize the integer point sampling of CP under the premise of saving system power dissipation, guarantee the accuracy of data receiver.
Description
Technical field
The present invention relates to the communications field more particularly to a kind of time-domain signal preprocess method and device, readable storage medium storing program for executing,
Receiver.
Background technique
In order to solve Cellular Networks capacity finiteness problem, third generation partner program (3rd Generation
Partnership Project, 3GPP) group is woven in communication standard version 13 (Release13) and introduces based on cellular narrowband
Internet of Things (Narrowband Internet of thing, NB-Iot) technology.While in order to guarantee and existing long term evolution
The compatibility of (Long Term Evolution, LTE) system, guarantees that its physical layer characteristic is almost the same, the system band of NB-Iot
Width is 180KHz (kHz).According to nyquist sampling rate theorem, the sample rate of NB-Iot system can be can be greatly reduced, from
And save system power dissipation.
In the prior art, in traditional LTE network, the smallest positive integral sample rate of cyclic prefix (cyclic prefix, CP) is
1.92MHz (megahertz).Under 1.92MHz sample rate, the CP length of the corresponding symbol 0 of each time slot (slot) is 10 samplings
Point, other symbols are 9 sampled points.In NB-Iot, along with the reduction of sample rate, when sample rate is lower than 1.92MHz, CP
Sampled point quantity be non-integral point, need to consider and handle the non-integer Sampling of CP, it will the frequency domain of each symbol is caused to be believed
Number initial phase can not be aligned, not can be carried out channel estimation.In order to guarantee the integer point sampling of CP, a kind of way is just to maintain
Least sampling rate is 1.92MHz on digital front-end, and another kind is exactly to increase digital up-sampled mechanism before removing CP.
But if guaranteeing the integer samples point of CP using aforesaid way, sample rate be cannot be below before removing CP
1.92MHz increases system power dissipation.
Summary of the invention
Present invention solves the technical problem that being how to realize the integer point sampling of CP under the premise of saving system power dissipation, protect
Demonstrate,prove the accuracy of data receiver.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of time-domain signal preprocess method, time-domain signal is pre-
Processing method includes: to carry out analog-to-digital conversion to the signal received, and to obtain digital signal, the signal received includes following
Ring prefix and data, the first sampled point that the digital signal, which includes the cyclic prefix, to be obtained in the first sample rate down-sampling and
The first sampled point that the data are obtained in the first sample rate down-sampling；In the second sample rate of utilization to the digital signal
Before carrying out down-sampling, according to the ratio of first sample rate and second sample rate, the of the cyclic prefix is lost
A part of one sampled point；Down-sampling is carried out to the digital signal after losing operation using second sample rate, and is gone
The second sampled point obtained except the cyclic prefix in the second sample rate down-sampling；To the letter after the removal cyclic prefix
Number carry out time-frequency conversion, to obtain frequency domain data.
Optionally, the ratio according to first sample rate and second sample rate, loses the cyclic prefix
A part of the first sampled point include: to lose the first of the cyclic prefix before being filtered to the digital signal
A part of sampled point, so that the number for losing the first sampled point of the cyclic prefix after operation is the integer of the ratio
Times.
Optionally, the ratio according to first sample rate and second sample rate, loses the cyclic prefix
A part of the first sampled point include: to lose the first of the cyclic prefix after being filtered to the digital signal
A part of sampled point, so that the number for losing the first sampled point of the cyclic prefix after operation is the integer of the ratio
Times.
Optionally, the number of the second sampled point of the cyclic prefix is integer.
Optionally, it includes: to the data in institute that the signal to after the removal cyclic prefix, which carries out time-frequency conversion,
It states the second sampled point that the second sample rate down-sampling obtains and carries out FFT transform.
Optionally, described before carrying out down-sampling to the digital signal using the second sample rate, according to described first
The ratio of sample rate and second sample rate, a part for losing the first sampled point of the cyclic prefix include: to utilize
Before second sample rate carries out last time down-sampling to the digital signal, according to first sample rate and described the
The ratio of two sample rates loses a part of the first sampled point of the cyclic prefix.
The embodiment of the invention also discloses a kind of time-domain signal pretreatment units, are used for receiver, time-domain signal pretreatment
Device includes: conversion module, described to receive to obtain digital signal suitable for carrying out analog-to-digital conversion to the signal that receives
Signal includes cyclic prefix and data, and the digital signal includes that the cyclic prefix is obtained in the first sample rate down-sampling
The first sampled point that one sampled point and the data are obtained in the first sample rate down-sampling；Preprocessing module is suitable in benefit
Before carrying out down-sampling to the digital signal with the second sample rate, according to first sample rate and second sample rate
Ratio loses a part of the first sampled point of the cyclic prefix；Remove module, suitable for using second sample rate to losing
The digital signal after falling operation carries out down-sampling, and removes the cyclic prefix and obtain in the second sample rate down-sampling
The second sampled point；Time-frequency conversion module, suitable for carrying out time-frequency conversion to the signal after the removal cyclic prefix, to obtain frequency
Numeric field data.
Optionally, the preprocessing module includes: the first pretreatment unit, suitable for being filtered to the digital signal
Before, a part of the first sampled point of the cyclic prefix is lost, so that lose the cyclic prefix after operation first adopts
The number of sampling point is the integral multiple of the ratio.
Optionally, the preprocessing module includes: the second pretreatment unit, suitable for being filtered to the digital signal
Later, a part of the first sampled point of the cyclic prefix is lost, so that lose the cyclic prefix after operation first adopts
The number of sampling point is the integral multiple of the ratio.
Optionally, the number of the second sampled point of the cyclic prefix is integer.
Optionally, the second sampling that the time-frequency conversion module obtains the data in the second sample rate down-sampling
Point carries out FFT transform.
Optionally, the preprocessing module is carrying out under last time the digital signal using second sample rate
Before sampling, according to the ratio of first sample rate and second sample rate, the first sampling of the cyclic prefix is lost
A part of point.
The embodiment of the invention also discloses a kind of readable storage medium storing program for executing, are stored thereon with computer instruction, the computer
The step of executing the time-domain signal preprocess method when instruction operation.
The embodiment of the invention also discloses a kind of receiver, including memory and processor, it is stored on the memory
The computer instruction that can be run on the processor, the processor execute the time domain letter when running the computer instruction
The step of number preprocess method.
The embodiment of the invention also discloses another time-domain signal preprocess methods, the described method comprises the following steps: right
The signal received carries out analog-to-digital conversion, and to obtain digital signal, the signal received includes cyclic prefix and data, institute
Digital signal the first sampled point that include the cyclic prefix obtain in the first sample rate down-sampling and the data are stated described
The first sampled point that first sample rate down-sampling obtains；Using the second sample rate to the digital signal carry out down-sampling it
Before, according to the ratio of first sample rate and second sample rate, the cyclic prefix is removed under the second sample rate
A part of second sampled point, to obtain the signal after removal cyclic prefix, second sample rate is less than first sampling
Rate；Time-frequency conversion and phase compensation are carried out to the signal after the removal cyclic prefix, to obtain frequency domain data.
Optionally, described after being filtered to the digital signal, according to the second sample rate and first sampling
The ratio of rate, a part for removing second sampled point of the cyclic prefix under the second sample rate includes: to the number
After signal is filtered and carries out down-sampling using second sample rate, the cyclic prefix is removed under the second sample rate
The second sampled point integer sampling point, the numerical value of the integer sampling point is the number by the first sampled point of the cyclic prefix
It is calculated with the ratio.
Optionally, it includes: to utilize the cyclic prefix that the signal to after the removal cyclic prefix, which carries out FFT transform,
The second sampled point non-integer sampling point numerical value to the frequency domain data carry out phase compensation.
Optionally, the numerical value of the non-integer sampling point of second sampled point using the cyclic prefix is to the frequency domain number
It include: to calculate phase compensating factor using the numerical value of the non-integer sampling point according to phase compensation is carried out, to frequency domain data
Carry out phase compensation.
Optionally, it is calculated using the following equation the phase compensating factor:
Wherein, i is complex factor, and K is sub-carrier indices, fsFor second sample rate,Exist for the cyclic prefix
Final position under second sample rate,N is symbol number,It represents
The corresponding time span of the cyclic prefix of symbol j, TsFor the sampling duration under first sample rate.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that
Technical solution of the present invention carries out analog-to-digital conversion to the signal that receives, described to receive to obtain digital signal
Signal includes cyclic prefix and data, and the digital signal includes that the cyclic prefix is obtained in the first sample rate down-sampling
The first sampled point that one sampled point and the data are obtained in the first sample rate down-sampling；In the second sample rate of utilization to institute
Before stating digital signal progress down-sampling, according to the ratio of first sample rate and second sample rate, described follow is lost
A part of first sampled point of ring prefix；The digital signal after losing operation is carried out down using second sample rate
Sampling, and remove the second sampled point that the cyclic prefix is obtained in the second sample rate down-sampling；The removal is recycled
Signal after prefix carries out time-frequency conversion, to obtain frequency domain data.Technical solution of the present invention passes through according to first sample rate
With the ratio of second sample rate, a part of the first sampled point of cyclic prefix is lost, thus utilizing the second sample rate
After carrying out down-sampling to digital signal, the quantity of the second obtained sampled point is integer, so as to pass through removal cyclic prefix
All the second sampled points, to remove whole cyclic prefix, and then guarantee that by the frequency domain data that time-frequency convert obtains be several
The data portion of the signal of word ensure that the accuracy of data receiver.Further, technical solution can make through the invention
Second sample rate meets nyquist sampling theorem, and going before cyclic prefix can be using lesser sample rate, greatly
The clock frequency of digital front-end is reduced, receiver power consumption is reduced.
Further, the ratio according to first sample rate and second sample rate, loses the cyclic prefix
A part of the first sampled point include: to lose the first of the cyclic prefix before being filtered to the digital signal
A part of sampled point, so that the number for losing the first sampled point of the cyclic prefix after operation is the integer of the ratio
Times.Technical solution of the present invention passes through a part for losing the first sampled point of cyclic prefix before digital filtering, can reduce
The coupling complexity of digital filtering operation and the hardware components of subsequent down-sampling operation, thus in the accuracy for guaranteeing data receiver
On the basis of, realize the easy and easy to implement of data receiving system.
Further, the ratio according to first sample rate and second sample rate, loses the cyclic prefix
A part of the first sampled point include: to lose the first of the cyclic prefix after being filtered to the digital signal
A part of sampled point, so that the number for losing the first sampled point of the cyclic prefix after operation is the integer of the ratio
Times.Technical solution of the present invention can be made by losing a part of the first sampled point of cyclic prefix after digital filtering
All the first sampled points of cyclic prefix must make full use of in digital filtering part, reduce the intersymbol interference (Inter of signal
Symbol Interference, ISI), it is further ensured that the accuracy of data receiver.
Detailed description of the invention
Fig. 1 is a kind of flow chart of time-domain signal preprocess method of the embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of time-domain signal pretreatment unit of the embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of receiver of the embodiment of the present invention.
Specific embodiment
As described in the background art, if the integer samples point for guaranteeing CP using aforesaid way, sample rate is equal before removing CP
It cannot be below 1.92MHz, increase system power dissipation.
Technical solution of the present invention is by the ratio according to first sample rate and second sample rate, before losing circulation
The a part for the first sampled point sewed, thus using the second sample rate to digital signal carry out down-sampling after, obtain second
The quantity of sampled point is integer, so as to pass through all the second sampled points of removal cyclic prefix, to remove whole circulations
Prefix, and then guarantee to pass through the data portion that the frequency domain data that time-frequency convert obtains is the signal of number, it ensure that data receiver
Accuracy.Further, technical solution can make the second sample rate meet nyquist sampling theorem i.e. through the invention
Can, it goes before cyclic prefix that the clock frequency of digital front-end can be greatly reduced using lesser sample rate, reduces and receive
Machine power consumption.
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
Fig. 1 is a kind of flow chart of time-domain signal preprocess method of the embodiment of the present invention.
Time-domain signal preprocess method shown in FIG. 1 can be used for receiver, and the time-domain signal preprocess method can be with
The following steps are included:
Step S101: analog-to-digital conversion is carried out to the signal received, to obtain digital signal, the signal packet received
Cyclic prefix and data are included, the digital signal includes the first sampling that the cyclic prefix is obtained in the first sample rate down-sampling
The first sampled point that point and the data are obtained in the first sample rate down-sampling；
Step S102: it before carrying out down-sampling to the digital signal using the second sample rate, is adopted according to described first
The ratio of sample rate and second sample rate loses a part of the first sampled point of the cyclic prefix；
Step S103: down-sampling is carried out to the digital signal after losing operation using second sample rate, and is gone
The second sampled point obtained except the cyclic prefix in the second sample rate down-sampling；
Step S104: time-frequency conversion is carried out to the signal after the removal cyclic prefix, to obtain frequency domain data.
In specific implementation, what receiver received is analog signal, therefore in step s101, it can be to the signal received
Carry out analog-to-digital conversion.Analog signal includes cyclic prefix (cyclic prefix, CP) and data (data)；And analog-to-digital conversion is grasped
It is equivalent to sampling operation, therefore passes through first sampled point of the available cyclic prefix of step S101 under the first sample rate, with
And first sampled point of the data under first sample rate.Analog signal is sampled using the first sample rate, Ke Yibao
The quantity for demonstrate,proving first sampled point of the cyclic prefix under the first sample rate is integer.
Specifically, the first sample rate is N × 1.92MHz, wherein N is positive integer.For example, in LTE system, it is single to carry
Wave maximum bandwidth is 20M, and the first sample rate is 30.72MHz.
It will be apparent to a skilled person that the cyclic prefix can be general cyclic prefix (normal
Cyclic prefix), it is also possible to extended cyclic prefix (Extended cyclic prefix).
In specific implementation, when using narrowband Internet of Things (Narrowband Internet of thing, NB-Iot) technology,
The system bandwidth of signal narrows, such as can be 180KHz.In such a case, it is possible to which lower sample rate is used to connect to reduce
Receipts machine power consumption.That is, after step slol, to the digital signal can also adopt using the second sample rate
Sample.However, to ensure that the quantity of second sampled point of the cyclic prefix under the second sample rate is integer, step can be passed through
S102 loses the first sampled point of the cyclic prefix according to the ratio of first sample rate and second sample rate
A part.
Specifically, the first sample rate and the second sample rate can be indicated with sample frequency, the sampling time can also be used
To indicate.For example, sample frequency is fs, then sampling time Ts=1/fs.Specifically, the second sample rate can be 240KHz,
The frequencies such as 480KHz.
In turn, in step s 103, the digital signal after losing operation is carried out down using second sample rate
After sampling, the quantity of second sampled point of the cyclic prefix under the second sample rate is integer.The cyclic prefix can then be removed
In the second sampled point that the second sample rate down-sampling obtains, to reach whole cyclic prefix in removal digital signal
Purpose.It only include the part data (data) in obtained digital signal by step S103.
In turn, in step S104, time-frequency conversion is carried out to the signal after the removal cyclic prefix, to obtain frequency domain number
According to so that frequency domain data is further processed in subsequent step.For example, carrying out channel estimation to frequency domain data, interpolation is filtered
The operation such as wave.
The embodiment of the present invention loses cyclic prefix by the ratio according to first sample rate and second sample rate
The first sampled point a part, thus using the second sample rate to digital signal carry out down-sampling after, second obtained is adopted
The quantity of sampling point is integer, so as to pass through all the second sampled points of removal cyclic prefix, before removing whole circulations
Sew, and then guarantee to pass through the data portion that the frequency domain data that time-frequency convert obtains is the signal of number, ensure that data receiver
Accuracy.Further, technical solution can make the second sample rate meet nyquist sampling theorem through the invention,
It goes before cyclic prefix that the clock frequency of digital front-end can be greatly reduced using lesser sample rate, reduces receiver
Power consumption.
Preferably, the number of the second sampled point of the cyclic prefix is integer.
In the present embodiment, the first of the cyclic prefix is lost according to the ratio of the second sample rate and first sample rate
After a part of sampled point, the number of the second sampled point of cyclic prefix is integer.For example, being 30.72MHz in the first sample rate
When, the first sampled point number of cyclic prefix is 160；When the second sample rate is 480KHz, the first sample rate and the second sampling
The ratio of rate is 64；The aliquant ratio 64 of first sampled point number 160, therefore need to lose a part of the first sampled point,
Lose 32 the first sampled points；Remaining 128 the first sampled points can divide exactly ratio 64 namely cyclic prefix in the second sampling
The second sampled point number under rate be 2 (namely 128 with the ratio of ratio 64).
In another preferred embodiment of the present invention, when the sample rate before being sampled using the second sample rate is greater than 1.92MHz,
Sample rate progress down-sampling is first then reduced to 1.92MHz, using as the first sample rate.Further according to the first sample rate and second
The ratio of sample rate loses a part of the first sampled point of cyclic prefix.
For example, the first sampled point number of cyclic prefix is 10 when the first sample rate is 1.92MHz；In the second sampling
When rate is 480KHz, the ratio of the first sample rate and the second sample rate is 4；The aliquant ratio 4 of first sampled point number 10, therefore
It needs to lose a part of the first sampled point, namely loses 2 the first sampled points；Remaining 8 the first sampled points can divide exactly ratio
The the second sampled point number of example 4 namely cyclic prefix under the second sample rate be 2 (namely 8 with the ratio of ratio 4).
Preferably, step S102 may comprise steps of: before being filtered to the digital signal, lose described
A part of first sampled point of cyclic prefix, so that the number for losing the first sampled point of the cyclic prefix after operation is institute
State the integral multiple of ratio.
The embodiment of the present invention passes through a part for losing the first sampled point of cyclic prefix before digital filtering, can subtract
The coupling complexity of decimal fractions filtering operation and the hardware components of subsequent down-sampling operation, thus guaranteeing the accurate of data receiver
Property on the basis of, realize data receiving system simplicity and it is easy to implement.
Preferably, step S102 may comprise steps of: after being filtered to the digital signal, lose described
A part of first sampled point of cyclic prefix, so that the number for losing the first sampled point of the cyclic prefix after operation is institute
State the integral multiple of ratio.
The embodiment of the present invention can be made by losing a part of the first sampled point of cyclic prefix after digital filtering
All the first sampled points for obtaining cyclic prefix must make full use of in digital filtering part, reduce the intersymbol interference (Inter of signal
Symbol Interference, ISI), it is further ensured that the accuracy of data receiver.
Preferably, step S104 may comprise steps of: obtain to the data in the second sample rate down-sampling
The second sampled point carry out Fast Fourier Transform (FFT) (Fast Fourier Transformation, FFT) transformation.
Preferably, step S102 may comprise steps of: using second sample rate to the digital signal into
Before row last time down-sampling, according to the ratio of first sample rate and second sample rate, before losing the circulation
The a part for the first sampled point sewed.
In the present embodiment, adopted in receiver reception signal under during obtaining frequency domain data, may will do it repeatedly
Sample operation.In order to achieve the purpose that completely remove cyclic prefix, it need to only guarantee the cyclic prefix after last time down-sampling operates
The number of sampled point be integer.That is, a part for losing the first sampled point of the cyclic prefix is most
It is carried out before a down-sampling afterwards.
For example, sharing 4 down-sampling operations in the preprocessing process of signal obtains cyclic prefix after the 3rd sampling
First sampled point loses a part of the first sampled point of the cyclic prefix then before the 4th sampling.
Fig. 2 is a kind of structural schematic diagram of time-domain signal pretreatment unit of the embodiment of the present invention.
Time-domain signal pretreatment unit 20 shown in Fig. 2 can be used for receiver, and time-domain signal pretreatment unit 20 can be with
Including conversion module 201, preprocessing module 202, removal module 203 and time-frequency conversion module 204.
Wherein, conversion module 201 is suitable for carrying out analog-to-digital conversion to the signal received, described to connect to obtain digital signal
The signal received includes cyclic prefix and data, and the digital signal includes that the cyclic prefix is obtained in the first sample rate down-sampling
To the first sampled point for being obtained in the first sample rate down-sampling of the first sampled point and the data；
Preprocessing module 202 is suitable for before carrying out down-sampling to the digital signal using the second sample rate, according to institute
The ratio for stating the first sample rate and second sample rate loses a part of the first sampled point of the cyclic prefix；
Removal module 203 is suitable for adopt to the digital signal after losing operation using second sample rate
Sample, and remove the second sampled point that the cyclic prefix is obtained in the second sample rate down-sampling；
Time-frequency conversion module 204 is suitable for carrying out time-frequency conversion to the signal after the removal cyclic prefix, to obtain frequency domain
Data.
The embodiment of the present invention loses cyclic prefix by the ratio according to first sample rate and second sample rate
The first sampled point a part, thus using the second sample rate to digital signal carry out down-sampling after, second obtained is adopted
The quantity of sampling point is integer, so as to pass through all the second sampled points of removal cyclic prefix, before removing whole circulations
Sew, and then guarantee to pass through the data portion that the frequency domain data that time-frequency convert obtains is the signal of number, ensure that data receiver
Accuracy.Further, technical solution can make the second sample rate meet nyquist sampling theorem through the invention,
It goes before cyclic prefix that the clock frequency of digital front-end can be greatly reduced using lesser sample rate, reduces receiver
Power consumption.
Preferably, preprocessing module 202 may include the first pretreatment unit 2021, and the first pretreatment unit 2021 is suitable for
Before being filtered to the digital signal, a part of the first sampled point of the cyclic prefix is lost, so that losing
The number of first sampled point of the cyclic prefix after operation is the integral multiple of the ratio.
Preferably, preprocessing module 202 may include the second pretreatment unit 2022, and the second pretreatment unit 2022 is suitable for
After being filtered to the digital signal, a part of the first sampled point of the cyclic prefix is lost, so that losing
The number of first sampled point of the cyclic prefix after operation is the integral multiple of the ratio.
Preferably, the time-frequency conversion module 204 data are obtained in the second sample rate down-sampling second
Sampled point carries out FFT transform.
Preferably, the preprocessing module 202 is carrying out last to the digital signal using second sample rate
Before secondary down-sampling, according to the ratio of first sample rate and second sample rate, the first of the cyclic prefix is lost
A part of sampled point.
Working principle, more contents of working method about the time-domain signal pretreatment unit 20, are referred to pair
The associated description of embodiment illustrated in fig. 1, which is not described herein again.
Fig. 3 is a kind of structural schematic diagram of receiver of the embodiment of the present invention.
As shown in figure 3, being based on orthogonal frequency division multiplexing (Orthogonal Frequency Division
Multiplexing, OFDM) system receiver generality structure it is as follows,
Radio frequency receiver 301 receives analog signal.Analog-digital converter (Analog-to-Digital Converter, ADC)
302 convert analog signals into digital signal using sample rate Fs=X × 1.92MHz.Numerically-controlled oscillator
(numerically controlled oscillator, NCO) 303 receive conversion after digital signal, and generate it is corresponding just
The sine and cosine sample of friendship.
In specific application scenarios, need for sample rate to be reduced to 1.92MHz, therefore can also be by configuring digital filter
Wave device chain 304 realizes X times of down-sampling of digital signal, to reach size for the sample rate of 1.92MHz.
In one embodiment of the invention, receiver can also include losing sampling point module 311, digital filter 312, down-sampling
Module 313 goes CP module 314 and FFT module 315.After the first sampling rate to 1.92MHz, sampling point module 311 is lost according to
The ratio of one sample rate and the second sample rate loses a part of the first sampled point.Pass through digital filtering in remaining digit signal
After device 312, down sample module 313 carries out down-sampling to it, and reaching the second sample rate Fs is 480KHz.Go CP module 314 to following
Second sampled point of ring prefix is removed, and the second sampled point of remaining data is sent to FFT module 315, is converted to frequency domain number
According to.
In another embodiment of the present invention, receiver can also include digital filter 316, lose sampling point module 317, under adopt
Egf block 318 goes CP module 319 and FFT module 320.Unlike a upper embodiment, loses sampling point module 317 and be located at number
At the subsequent step of filter 316 namely digital filter 316 first carries out digital filtering, loses sampling point module 317 and executes again and loses sample
Point operation.
In another embodiment of the invention, receiver can also include digital filter 305, down sample module 306, remove CP
Module 307, FFT module 308 and phase compensation block 309.In the present embodiment, after the first sampling rate to 1.92MHz, number
Signal passes through digital filter 305, and down sample module 306 carries out down-sampling to it, and reaching the second sample rate Fs is 480KHz.It goes
CP module 307 is removed the second sampled point of cyclic prefix, and remaining second sampled point is sent to FFT module 308, is converted to
Frequency domain data.By in this present embodiment, after down sample module 306, the number of the second sampled point of cyclic prefix is non-whole
Number, for example, the number of the first sampled point of cyclic prefix is 10, by down sample module 306 under the sample rate of 1.92MHz
Afterwards, the number of the second sampled point of cyclic prefix is 2.5.It goes CP module 307 that can only remove 2 second of cyclic prefix at this time to adopt
Sampling point there remains 0.5 sampled point；After FFT module 308, the initial phase of the frequency-region signal of each symbol is not aligned,
Therefore, it is necessary to initial phase of the phase compensation block 309 to frequency-region signal to compensate, so that the frequency-region signal of each symbol
Initial phase alignment.
In specific implementation, phase compensation block 309 can be calculated using the following equation the phase compensating factor:Wherein, i is complex factor, and K is sub-carrier indices, fsFor second sample rate,For final position of the cyclic prefix under the second sample rate,
N is symbol number,Represent the corresponding time span of cyclic prefix of symbol j, TsFor the sampling under first sample rate
Duration.The phase compensating factor is multiplied with frequency-region signal, and final frequency-region signal can be obtained, to be used for channel estimation.
It should be noted that as shown in figure 3, multiple modules shown in label 1,2 and 3 can select a configuration in receiver
In, in receivers without all configurations.
The embodiment of the invention also discloses a kind of readable storage medium storing program for executing, are stored thereon with computer instruction, the computer
The step of time-domain signal preprocess method shown in Fig. 1 can be executed when instruction operation.The storage medium may include ROM,
RAM, disk or CD etc..
The embodiment of the invention also discloses a kind of receiver, the receiver may include memory and processor, described
The computer instruction that can be run on the processor is stored on memory.When the processor runs the computer instruction
The step of time-domain signal preprocess method shown in Fig. 1 can be executed.
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (14)
1. a kind of time-domain signal preprocess method is used for receiver characterized by comprising
Analog-to-digital conversion is carried out to the signal that receives, to obtain digital signal, the signal received include cyclic prefix and
Data, the first sampled point and the data that the digital signal, which includes the cyclic prefix, to be obtained in the first sample rate down-sampling
In the first sampled point that the first sample rate down-sampling obtains；
Before carrying out down-sampling to the digital signal using the second sample rate, according to first sample rate and described second
The ratio of sample rate loses a part of the first sampled point of the cyclic prefix；
Down-sampling is carried out to the digital signal after losing operation using second sample rate, and removes the cyclic prefix
In the second sampled point that the second sample rate down-sampling obtains；
Time-frequency conversion is carried out to the signal after the removal cyclic prefix, to obtain frequency domain data.
2. time-domain signal preprocess method according to claim 1, which is characterized in that described according to first sample rate
With the ratio of second sample rate, a part for losing the first sampled point of the cyclic prefix includes:
Before being filtered to the digital signal, a part of the first sampled point of the cyclic prefix is lost, so that
The number of first sampled point of the cyclic prefix after losing operation is the integral multiple of the ratio.
3. time-domain signal preprocess method according to claim 1, which is characterized in that described according to first sample rate
With the ratio of second sample rate, a part for losing the first sampled point of the cyclic prefix includes:
After being filtered to the digital signal, a part of the first sampled point of the cyclic prefix is lost, so that
The number of first sampled point of the cyclic prefix after losing operation is the integral multiple of the ratio.
4. time-domain signal preprocess method according to claim 1, which is characterized in that the second sampling of the cyclic prefix
The number of point is integer.
5. time-domain signal preprocess method according to claim 1, which is characterized in that described to the removal cyclic prefix
Signal afterwards carries out time-frequency conversion
FFT transform is carried out in the second sampled point that the second sample rate down-sampling obtains to the data.
6. time-domain signal preprocess method according to claim 1, which is characterized in that described to utilize the second sample rate pair
Before the digital signal carries out down-sampling, according to the ratio of first sample rate and second sample rate, lose described
A part of first sampled point of cyclic prefix includes:
Before carrying out last time down-sampling to the digital signal using second sample rate, according to first sampling
The ratio of rate and second sample rate loses a part of the first sampled point of the cyclic prefix.
7. a kind of time-domain signal pretreatment unit is used for receiver characterized by comprising
Conversion module, suitable for carrying out analog-to-digital conversion to the signal received, to obtain digital signal, the signal packet received
Cyclic prefix and data are included, the digital signal includes the first sampling that the cyclic prefix is obtained in the first sample rate down-sampling
The first sampled point that point and the data are obtained in the first sample rate down-sampling；
Preprocessing module is suitable for before carrying out down-sampling to the digital signal using the second sample rate, according to described first
The ratio of sample rate and second sample rate loses a part of the first sampled point of the cyclic prefix；
Module is removed, suitable for carrying out down-sampling to the digital signal after losing operation using second sample rate, and is gone
The second sampled point obtained except the cyclic prefix in the second sample rate down-sampling；
Time-frequency conversion module, suitable for carrying out time-frequency conversion to the signal after the removal cyclic prefix, to obtain frequency domain data.
8. time-domain signal pretreatment unit according to claim 7, which is characterized in that the preprocessing module includes:
First pretreatment unit, first suitable for before being filtered to the digital signal, losing the cyclic prefix adopts
A part of sampling point, so that the number for losing the first sampled point of the cyclic prefix after operation is the integral multiple of the ratio.
9. time-domain signal pretreatment unit according to claim 7, which is characterized in that the preprocessing module includes:
Second pretreatment unit, first suitable for after being filtered to the digital signal, losing the cyclic prefix adopts
A part of sampling point, so that the number for losing the first sampled point of the cyclic prefix after operation is the integral multiple of the ratio.
10. time-domain signal pretreatment unit according to claim 7, which is characterized in that the second of the cyclic prefix is adopted
The number of sampling point is integer.
11. time-domain signal pretreatment unit according to claim 7, which is characterized in that the time-frequency conversion module is to institute
It states data and carries out FFT transform in the second sampled point that the second sample rate down-sampling obtains.
12. time-domain signal pretreatment unit according to claim 7, which is characterized in that the preprocessing module is utilizing
Before second sample rate carries out last time down-sampling to the digital signal, according to first sample rate and described the
The ratio of two sample rates loses a part of the first sampled point of the cyclic prefix.
13. a kind of readable storage medium storing program for executing, is stored thereon with computer instruction, which is characterized in that when the computer instruction is run
The step of time-domain signal preprocess method described in any one of perform claim requirement 1 to 6.
14. a kind of receiver, including memory and processor, be stored on the memory to run on the processor
Computer instruction, which is characterized in that perform claim requires any one of 1 to 6 when the processor runs the computer instruction
The step of time-domain signal preprocess method.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710673398.9A CN109391575B (en) | 2017-08-08 | 2017-08-08 | Time domain signal preprocessing method and device, readable storage medium and receiver |
| CN201910799906.7A CN110519197B (en) | 2017-08-08 | 2017-08-08 | Time domain signal preprocessing method and device, storage medium and receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710673398.9A CN109391575B (en) | 2017-08-08 | 2017-08-08 | Time domain signal preprocessing method and device, readable storage medium and receiver |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910799906.7A Division CN110519197B (en) | 2017-08-08 | 2017-08-08 | Time domain signal preprocessing method and device, storage medium and receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109391575A true CN109391575A (en) | 2019-02-26 |
| CN109391575B CN109391575B (en) | 2021-05-11 |
Family
ID=65414133
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710673398.9A Active CN109391575B (en) | 2017-08-08 | 2017-08-08 | Time domain signal preprocessing method and device, readable storage medium and receiver |
| CN201910799906.7A Active CN110519197B (en) | 2017-08-08 | 2017-08-08 | Time domain signal preprocessing method and device, storage medium and receiver |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910799906.7A Active CN110519197B (en) | 2017-08-08 | 2017-08-08 | Time domain signal preprocessing method and device, storage medium and receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN109391575B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117336133A (en) * | 2023-10-25 | 2024-01-02 | 白盒子(上海)微电子科技有限公司 | Low-complexity OFDM (orthogonal frequency division multiplexing) cyclic prefix removing method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9313078B1 (en) * | 2015-04-09 | 2016-04-12 | Xilinx, Inc. | Pulse cancellation crest factor reduction with a low sampling rate |
| CN106254046A (en) * | 2015-06-05 | 2016-12-21 | 上海数字电视国家工程研究中心有限公司 | The choosing method of leading symbol signal length |
| CN106470179A (en) * | 2015-08-21 | 2017-03-01 | 展讯通信（上海）有限公司 | Mobile terminal upward signal generation method and device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100571240C (en) * | 2006-08-17 | 2009-12-16 | 中兴通讯股份有限公司 | A kind of circulation prefix parameter setting method of wireless signal framing |
| CN102790736B (en) * | 2011-04-07 | 2015-04-01 | 中兴通讯股份有限公司 | Methods for transmitting and receiving data and devices for transmitting and receiving data based on orthogonal frequency division multiplexing technology |
| WO2015019964A1 (en) * | 2013-08-06 | 2015-02-12 | 三菱電機株式会社 | Transmitting device, receiving device, and communication system |
| KR20160033916A (en) * | 2014-09-19 | 2016-03-29 | 한국전자통신연구원 | Sampling rate converter and method thereof |
-
2017
- 2017-08-08 CN CN201710673398.9A patent/CN109391575B/en active Active
- 2017-08-08 CN CN201910799906.7A patent/CN110519197B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9313078B1 (en) * | 2015-04-09 | 2016-04-12 | Xilinx, Inc. | Pulse cancellation crest factor reduction with a low sampling rate |
| CN106254046A (en) * | 2015-06-05 | 2016-12-21 | 上海数字电视国家工程研究中心有限公司 | The choosing method of leading symbol signal length |
| CN106470179A (en) * | 2015-08-21 | 2017-03-01 | 展讯通信（上海）有限公司 | Mobile terminal upward signal generation method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110519197A (en) | 2019-11-29 |
| CN109391575B (en) | 2021-05-11 |
| CN110519197B (en) | 2022-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102065043B (en) | Frequency domain parallel demodulation method in high-speed communication system | |
| CN1719818B (en) | Apparatus and method for processing sampling frequency deviation tracking signal in orthogonal frequency division multiplex system | |
| Wild et al. | A reduced complexity transmitter for UF-OFDM | |
| CN107040486B (en) | A kind of QPSK demodulating system and method that any bit rate is adaptive | |
| CN104539262B (en) | A kind of digital fabrication filter processing method of continuous variable speed | |
| EP3499752B1 (en) | Transmission apparatus, reception apparatus, and communication system | |
| CN102299737A (en) | Multi-path fast frequency hopping signal processing method | |
| US9357517B2 (en) | Apparatus and method for wireless baseband processing | |
| CN114938255A (en) | High-speed time domain parallel timing synchronization method based on O & M algorithm | |
| JP6397505B2 (en) | Signal processing method and apparatus based on compressed sensing | |
| CN109391575A (en) | Time-domain signal preprocess method and device, readable storage medium storing program for executing, receiver | |
| CN117176529B (en) | FSK signal demodulation method and device | |
| CN102158451A (en) | High-speed multi-carrier multiphase interpolation filter method and device | |
| CN105791197B (en) | A kind of pulse shaping filter of offset quadrature multicarrier system | |
| CN107612860A (en) | Synchronization and down-sampling method of estimation suitable for 802.11ac receivers | |
| Kang et al. | Computational complexity analysis of FBMC-OQAM under different strategic conditions | |
| CN115996162A (en) | Time domain O & M timing synchronization method for serial high-efficiency communication | |
| CN109714144B (en) | Timing synchronization recovery method and system | |
| CN103841074A (en) | Ultra wideband receiver synchronization method based on FPGA parallel processing | |
| CN104202280A (en) | Hardware implementation for channel equalization of MIMO-OFDM (multiple-input multiple-output and orthogonal frequency division multiplexing) system | |
| CN109039985B (en) | OFDM signal blind demodulation method based on resampling | |
| WO2016119457A1 (en) | Frequency offset estimation method and apparatus, and computer storage medium | |
| CN109660266B (en) | Signal processing method and device | |
| CN105703854B (en) | A kind of method for noise power estimation | |
| CN112751794B (en) | FPGA-based discontinuous phase 2FSK signal symbol rate estimation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 100089 18 / F, block B, Zhizhen building, No.7, Zhichun Road, Haidian District, Beijing Applicant after: Beijing Ziguang zhanrui Communication Technology Co.,Ltd. Address before: 100084, Room 516, building A, Tsinghua Science Park, Beijing, Haidian District Applicant before: BEIJING SPREADTRUM HI-TECH COMMUNICATIONS TECHNOLOGY Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |