CN106921450A - A kind of signal-noise ratio estimation method and device - Google Patents

A kind of signal-noise ratio estimation method and device Download PDF

Info

Publication number
CN106921450A
CN106921450A CN201710265465.3A CN201710265465A CN106921450A CN 106921450 A CN106921450 A CN 106921450A CN 201710265465 A CN201710265465 A CN 201710265465A CN 106921450 A CN106921450 A CN 106921450A
Authority
CN
China
Prior art keywords
ofdm symbol
currently received
frequency
domain data
received ofdm
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
Application number
CN201710265465.3A
Other languages
Chinese (zh)
Other versions
CN106921450B (en
Inventor
张力
吕炳赟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Xinsheng Electronic Technology Co Ltd
Original Assignee
Zhejiang Dahua Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zhejiang Dahua Technology Co Ltd filed Critical Zhejiang Dahua Technology Co Ltd
Priority to CN201710265465.3A priority Critical patent/CN106921450B/en
Publication of CN106921450A publication Critical patent/CN106921450A/en
Application granted granted Critical
Publication of CN106921450B publication Critical patent/CN106921450B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/022—Channel estimation of frequency response

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

A kind of method and device of signal-to-noise ratio (SNR) estimation that the application is provided, is used to improve the signal-to-noise ratio (SNR) estimation degree of accuracy.A kind of signal-noise ratio estimation method that the embodiment of the present application is provided, the method includes：Determine the frequency domain data of the frequency pilot sign of currently received OFDM symbol, and the frequency domain data with the frequency pilot sign of the OFDM symbol adjacent OFDM symbol；Using frequency domain data, currently received OFDM symbol and the channel response average value with the OFDM symbol adjacent OFDM symbol are determined, and according to channel response average value, determine the noise power of currently received OFDM symbol；According to the noise power of currently received OFDM symbol, the signal to noise ratio of currently received OFDM symbol is determined.

Description

A kind of signal-noise ratio estimation method and device
Technical field
The application is related to communication technical field, more particularly to a kind of signal-noise ratio estimation method and device.
Background technology
In OFDM (Orthogonal Frequency Division Multiplexing, OFDM) system In, for correct demodulating data, it is necessary to receiving terminal can accurately estimate signal to noise ratio, whether signal-to-noise ratio (SNR) estimation is accurate, directly affects The performance of weighing apparatus module and channel decoding module.
In the method for the signal-to-noise ratio (SNR) estimation of prior art, the degree of accuracy of signal-to-noise ratio (SNR) estimation is sensitive to frequency deviation, when the letter of input After number being superimposed the frequency deviation of certain frequency, the degree of accuracy of signal-to-noise ratio (SNR) estimation can decline.Frequency deviation is more severe, signal-to-noise ratio (SNR) estimation it is accurate Degree declines more severe.
In sum, the signal-to-noise ratio (SNR) estimation degree of accuracy of signal-noise ratio estimation method of the prior art is relatively low.
The content of the invention
The embodiment of the present application provides a kind of method and device of signal-to-noise ratio (SNR) estimation, is used to improve signal-to-noise ratio (SNR) estimation accurate Degree.
A kind of signal-noise ratio estimation method that the embodiment of the present application is provided, the method includes：
Determine the frequency domain data of the frequency pilot sign of currently received OFDM symbol, and accorded with the OFDM symbol adjacent OFDM Number frequency pilot sign frequency domain data；
Using the frequency domain data, determine the currently received OFDM symbol and with the OFDM symbol adjacent OFDM symbol Channel response average value, and according to the channel response average value, determine the noise work(of the currently received OFDM symbol Rate；
According to the noise power of the currently received OFDM symbol, the noise of the currently received OFDM symbol is determined Than.
The signal-noise ratio estimation method that the embodiment of the present application is provided, the frequency domain of the frequency pilot sign by determining adjacent OFDM symbol Data, determine the channel response average value of adjacent OFDM symbol, and determine current reception according to the channel response average value The noise power of OFDM symbol, the signal to noise ratio of OFDM symbol is determined further with the noise power of the OFDM symbol, can be with Influence of the resistance frequency deviation to signal-to-noise ratio (SNR) estimation, such that it is able to improve the signal-to-noise ratio (SNR) estimation degree of accuracy.
It is preferred that determining the frequency domain data of the frequency pilot sign of currently received OFDM symbol, specifically include：
Currently received OFDM symbol is pre-processed, the baseband frequency-domain number of the currently received OFDM symbol is obtained According to；From the baseband frequency-domain data of the currently received OFDM symbol, the pilot tone of the currently received OFDM symbol is determined The frequency domain data of symbol.
It is preferred that being pre-processed to the data of currently received OFDM symbol, the currently received OFDM symbols are obtained Number baseband frequency-domain data specifically include：
According to equation below, the time domain data to the currently received OFDM symbol carries out Fast Fourier Transform (FFT), obtains Obtain the baseband frequency-domain data of the currently received OFDM symbol：
Wherein, YkIt is the frequency domain data on+1 subcarrier of kth of the currently received OFDM symbol, ynWork as described Time domain data on (n+1)th subcarrier of the OFDM symbol of preceding reception, N is subcarrier number, and j is imaginary unit, described to work as The baseband frequency-domain data of the OFDM symbol of preceding reception include the frequency domain data on N number of subcarrier, the frequency domain on N number of subcarrier Frequency domain data in data on portion subcarriers is the frequency domain data of frequency pilot sign.
It is preferred that from the baseband frequency-domain data of the currently received OFDM symbol, determining described currently received The frequency domain data of the frequency pilot sign of OFDM symbol is specifically included：According to the sequence number of the default portion subcarriers, it is determined that currently The frequency domain data of the frequency pilot sign of the OFDM symbol of reception.
It is preferred that using equation below, determine the currently received OFDM symbol and with the OFDM symbol adjacent OFDM The channel response average value of symbol：
Wherein,The l+1 son for the currently received OFDM symbol and with the OFDM symbol adjacent OFDM symbol Channel response average value on carrier wave,It is the frequency domain number of the frequency pilot sign on the l+1 subcarrier of default pilot frequency sequence According to conjugation, Y1, lIt is the frequency domain data of the frequency pilot sign on the l+1 subcarrier of the currently received OFDM symbol, Y0, l It is the frequency domain data with the frequency pilot sign of the currently received OFDM symbol adjacent OFDM symbol on the l+1 subcarrier, M It is the sequence number set of the portion subcarriers.
It is preferred that using equation below, calculating the noise power of the currently received OFDM symbol
Wherein,It is the currently received OFDM symbol noise power,For the currently received OFDM symbol and With the conjugation of the channel response average value on the l+1 subcarrier of the OFDM symbol adjacent OFDM symbol, P currently connect for described The number of frequency pilot sign in the OFDM symbol of receipts,For the currently received OFDM symbol and adjacent with the OFDM symbol The mould of the channel response average value on the l+1 subcarrier of OFDM symbol, Im is represented and is taken imaginary part.
A kind of signal-to-noise ratio (SNR) estimation device that the embodiment of the present application is provided, the device includes：
First module, the frequency domain data of the frequency pilot sign for determining currently received OFDM symbol, and with the OFDM The frequency domain data of the frequency pilot sign of symbol adjacent OFDM symbol；
Second unit, for utilizing the frequency domain data, determines the currently received OFDM symbol and is accorded with the OFDM The channel response average value of number adjacent OFDM symbol, and according to the channel response average value, determine described currently received The noise power of OFDM symbol；
Unit the 3rd, for the noise power according to the currently received OFDM symbol, determines described currently received The signal to noise ratio of OFDM symbol.
It is preferred that the first module, determines the frequency domain data of the frequency pilot sign of currently received OFDM symbol, specific bag Include：
Currently received OFDM symbol is pre-processed, the baseband frequency-domain number of the currently received OFDM symbol is obtained According to；From the baseband frequency-domain data of the currently received OFDM symbol, the pilot tone of the currently received OFDM symbol is determined The frequency domain data of symbol.
It is preferred that the first module, the data to currently received OFDM symbol are pre-processed, and obtain described current The baseband frequency-domain data of the OFDM symbol of reception are specifically included：
Using equation below, the time domain data to the currently received OFDM symbol carries out Fast Fourier Transform (FFT), obtains Obtain the baseband frequency-domain data of the currently received OFDM symbol：
Wherein, YkIt is the frequency domain data on+1 subcarrier of kth of the currently received OFDM symbol, ynWork as described Time domain data on (n+1)th subcarrier of the OFDM symbol of preceding reception, N is subcarrier number, and j is imaginary unit, described to work as The baseband frequency-domain data of the OFDM symbol of preceding reception include the frequency domain data on N number of subcarrier, the frequency domain on N number of subcarrier Frequency domain data in data on portion subcarriers is the frequency domain data of frequency pilot sign.
It is preferred that the first module, from the baseband frequency-domain data of the currently received OFDM symbol, it is determined that described The frequency domain data of the frequency pilot sign of currently received OFDM symbol is specifically included：According to the sequence of the default portion subcarriers Number, determine the frequency domain data of the frequency pilot sign of currently received OFDM symbol.
It is preferred that the second unit, using equation below, determine the currently received OFDM symbol and with the OFDM The channel response average value of symbol adjacent OFDM symbol：
Wherein,The l+1 son for the currently received OFDM symbol and with the OFDM symbol adjacent OFDM symbol Channel response average value on carrier wave,It is the frequency domain number of the frequency pilot sign on the l+1 subcarrier of default pilot frequency sequence According to conjugation, Y1, lIt is the frequency domain data of the frequency pilot sign on the l+1 subcarrier of the currently received OFDM symbol, Y0, l It is the frequency domain data with the frequency pilot sign of the currently received OFDM symbol adjacent OFDM symbol on the l+1 subcarrier, M It is the sequence number set of the portion subcarriers.
It is preferred that the second unit, using equation below, calculates the noise work(of the currently received OFDM symbol Rate：
Wherein,It is the currently received OFDM symbol noise power,For the currently received OFDM symbol and With the conjugation of the channel response average value on the l+1 subcarrier of the OFDM symbol adjacent OFDM symbol, P currently connect for described The number of frequency pilot sign in the OFDM symbol of receipts,For the currently received OFDM symbol and adjacent with the OFDM symbol The mould of the channel response average value on the l+1 subcarrier of OFDM symbol, Im is represented and is taken imaginary part.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme in the embodiment of the present application, below will be to make needed for embodiment description Accompanying drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the present application, for this For the those of ordinary skill in field, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings Accompanying drawing.
A kind of signal-noise ratio estimation method schematic flow sheet that Fig. 1 is provided for the embodiment of the present application；
A kind of signal-to-noise ratio (SNR) estimation apparatus structure schematic diagram that Fig. 2 is provided for the embodiment of the present application.
Specific embodiment
The embodiment of the present application provides a kind of method and device of signal-to-noise ratio (SNR) estimation, is used to improve signal-to-noise ratio (SNR) estimation accurate Degree.
A kind of signal-noise ratio estimation method that the embodiment of the present application is provided, as shown in figure 1, the method includes：
S101, determine currently received OFDM symbol frequency pilot sign frequency domain data, it is and adjacent with the OFDM symbol The frequency domain data of the frequency pilot sign of OFDM symbol；
S102, using the frequency domain data, determine the currently received OFDM symbol and adjacent with the OFDM symbol The channel response average value of OFDM symbol, and according to the channel response average value, determine the currently received OFDM symbol Noise power；
S103, the noise power according to the currently received OFDM symbol, determine the currently received OFDM symbol Signal to noise ratio.
The signal-noise ratio estimation method that the embodiment of the present application is provided, the frequency domain of the frequency pilot sign by determining adjacent OFDM symbol Data, determine the channel response average value of adjacent OFDM symbol, and are determined according to the channel response average value currently received The noise power of OFDM symbol, the current reception is determined further with the noise power of the currently received OFDM symbol OFDM symbol signal to noise ratio, such that it is able to resist influence of the frequency deviation to signal-to-noise ratio (SNR) estimation, improve the signal-to-noise ratio (SNR) estimation degree of accuracy.
It is preferred that in step S101, determine the frequency domain data of the frequency pilot sign of currently received OFDM symbol, specific bag Include：
Currently received OFDM symbol is pre-processed, the baseband frequency-domain number of the currently received OFDM symbol is obtained According to；From the baseband frequency-domain data of the currently received OFDM symbol, the pilot tone of the currently received OFDM symbol is determined The frequency domain data of symbol.
It should be noted that the sub-carrier frequencies that the baseband frequency-domain data refer to the OFDM symbol are the situation of 0Hz Under, the frequency domain data of the OFDM symbol.
It is preferred that the data of the OFDM symbol to receiving are pre-processed, the baseband frequency-domain number of the OFDM symbol is obtained According to specifically including：
According to equation below, the time domain data to the currently received OFDM symbol carries out Fast Fourier Transform (FFT) (Fast Fourier Transform, FFT), obtains the baseband frequency-domain data of the currently received OFDM symbol：
Wherein, YkIt is the frequency domain data on+1 subcarrier of kth of the currently received OFDM symbol, ynWork as described Time domain data on (n+1)th subcarrier of the OFDM symbol of preceding reception, N is subcarrier number, and j is imaginary unit, described to work as The baseband frequency-domain data of the OFDM symbol of preceding reception include the frequency domain data on N number of subcarrier, the frequency domain on N number of subcarrier Frequency domain data in data on portion subcarriers is the frequency domain data of frequency pilot sign.
It is preferred that from the baseband frequency-domain data of the OFDM symbol, determining the frequency of the frequency pilot sign of the OFDM symbol Numeric field data is specifically included：According to the sequence number of the default portion subcarriers, the pilot tone symbol of currently received OFDM symbol is determined Number frequency domain data.
It should be noted that both including the frequency domain data of valid data in a baseband frequency-domain data for OFDM symbol or wrapping Include the frequency domain data of frequency pilot sign.The sequence number of the default portion subcarriers is according to pilot tone in default pilot frequency sequence The corresponding subcarrier sequence number of symbol determines.The known of the default pilot frequency sequence, i.e. transmitting terminal and receiving terminal storage is led Frequency sequence, in the initial signal that transmitting terminal sends, the information of pilot frequency sequence, such as the frequency pilot sign corresponding portion in OFDM symbol The sequence number of molecule carrier wave and the frequency domain data of frequency pilot sign, are all known, and pilot tone for transmitting terminal and receiving terminal Sequence number of the symbol in OFDM symbol is changeless.
Due to the presence of noise, frequency domain number of the frequency pilot sign on the l+1 subcarrier in currently received OFDM symbol According to YlIt is represented by
Yl=HlCl+Jl, l ∈ M；
Wherein, HlIt is the channel response on the l+1 subcarrier of currently received OFDM symbol, ClIt is default pilot tone Frequency domain data of the frequency pilot sign of sequence on the l+1 subcarrier, JlIt is the noise on the l+1 subcarrier, M is described The sequence number set of portion subcarriers, i.e. M is the subset of [0, N-1].
It should be noted that in each OFDM symbol, the frequency pilot sign of default pilot frequency sequence is on the l+1 subcarrier Frequency domain data ClIt is identical.
By taking the 1st OFDM symbol for receiving and the 2nd OFDM symbol as an example, the signal to noise ratio provided the embodiment of the present application Method of estimation is illustrated.Wherein, the 2nd OFDM symbol is currently received OFDM symbol, ignores noise, the 1st OFDM symbol Number l-th subcarrier on channel response beOn 2nd l-th subcarrier of OFDM symbol Channel response is
Wherein, Y0, lRepresent frequency domain data of the 1st frequency pilot sign of OFDM symbol on the l+1 subcarrier, Y1,kTable Show frequency domain data of the 2nd frequency pilot sign of OFDM symbol on the l+1 subcarrier.
The energy of frequency pilot sign is 1, i.e.,
Then the 1st OFDM symbol and the 2nd channel response of the OFDM symbol on the l+1 subcarrier can be represented respectively ForWith
Then the 1st OFDM symbol and the 2nd channel response average value of the OFDM symbol on the l+1 subcarrier are：
Wherein,It is that the 1st OFDM symbol and the 2nd channel response of the OFDM symbol on the l+1 subcarrier are average Value,It is the conjugation of frequency domain data of the default pilot frequency sequence on the l+1 subcarrier.
It should be noted that the method for the signal-to-noise ratio (SNR) estimation that the embodiment of the present application is provided, it is also possible to determine adjacent multiple The frequency domain data of the frequency pilot sign of OFDM symbol determines that channel response of the multiple OFDM symbol on the l+1 subcarrier is put down Average, for example, can determine the frequency domain data Y on the l+1 subcarrier of the frequency pilot sign of adjacent three OFDM symbolsI, l、 YI+1, l、YI+2, l, wherein, YI+2, lIt is the frequency domain number of the frequency pilot sign on the l+1 subcarrier of currently received OFDM symbol According to, i can since 0 value, this kind of situation Y0, lFirst frequency pilot sign of OFDM symbol for receiving is represented in the l+1 son Frequency domain data on carrier wave, i can also since 1 value, this kind of situation Y1, lRepresent first pilot tone of OFDM symbol for receiving Frequency domain data of the symbol on the l+1 subcarrier.
It is preferred that using equation below, determining the noise work(of the currently received OFDM symbol i.e. the 2nd OFDM symbol Rate：
Wherein,It is the 2nd OFDM symbol noise power,It is the 1st OFDM symbol and the l of the 2nd OFDM symbol The conjugation of the channel response average value on+1 subcarrier, P is the number of frequency pilot sign in the 2nd OFDM symbol,It is the 1st The mould of the channel response average value in individual OFDM symbol and the 2nd the l+1 subcarrier of OFDM symbol, Im is represented and is taken imaginary part.
It is preferred that be the 2nd noise power of OFDM symbol according to currently received OFDM symbol, determine described currently to connect The signal to noise ratio of the OFDM symbol of receipts is specifically included：
According to the 2nd baseband frequency-domain data of OFDM symbol, the mean power of the currently received OFDM symbol is determined For：
According to the 2nd mean power of OFDM symbol and the 2nd noise power of OFDM symbol, the 2nd OFDM symbol is determined Number signal power be：
Determine that the signal power of the 2nd OFDM symbol and the ratio of the 2nd noise power of OFDM symbol are:
Wherein, SNR is the 2nd signal to noise ratio of OFDM symbol.
The above-mentioned signal-noise ratio estimation method that the embodiment of the present application is provided is applied in 802.16d communication standards, group is carried Ripple number N=1024, when being superimposed the frequency deviation of 50kHz in the channel, the signal-noise ratio estimation method that the embodiment of the present application is provided Normalized mean squared error (Normalized Mean Square Error, NMSE) can reach 10-4The order of magnitude, and prior art The NMSE of the SNR estimates for obtaining is 10-2The order of magnitude, it is seen that the signal-noise ratio estimation method that the embodiment of the present application is provided has anti-frequency Inclined characteristic, in the case where there is frequency deviation, the degree of accuracy of signal-to-noise ratio (SNR) estimation is higher than the prior art signal-to-noise ratio (SNR) estimation degree of accuracy.Its The computing formula of middle NMSE is：
WhereinRepresent by calculating the noise power-value for obtaining, X represents the actual value of noise power, and NMSE is smaller, noise It is more accurate that power is estimated.
Corresponding with the signal-noise ratio estimation method that the embodiment of the present application is provided, the embodiment of the present application additionally provides a kind of noise Compared estimate device, as shown in Fig. 2 the device includes：
First module 201, the frequency domain data of the frequency pilot sign for determining currently received OFDM symbol, and with this The frequency domain data of the frequency pilot sign of OFDM symbol adjacent OFDM symbol；
Second unit 202, for utilize the frequency domain data, determine the currently received OFDM symbol and with the OFDM The channel response average value of symbol adjacent OFDM symbol, and according to the channel response average value, determine described currently received The noise power of OFDM symbol；
3rd unit 203, for the noise power according to the currently received OFDM symbol, determines the current reception OFDM symbol signal to noise ratio.
The signal-to-noise ratio (SNR) estimation device that the embodiment of the present application is provided, the frequency domain of the frequency pilot sign by determining adjacent OFDM symbol Data, determine the channel response average value of adjacent OFDM symbol, and determine current reception according to the channel response average value The noise power of OFDM symbol, the signal to noise ratio of OFDM symbol is determined further with the noise power of the OFDM symbol, can be with Influence of the resistance frequency deviation to signal-to-noise ratio (SNR) estimation, improves the signal-to-noise ratio (SNR) estimation degree of accuracy.
It is preferred that the first module 201, determines the frequency domain data of the frequency pilot sign of currently received OFDM symbol, tool Body includes：
Currently received OFDM symbol is pre-processed, the baseband frequency-domain number of the currently received OFDM symbol is obtained According to；From the baseband frequency-domain data of the currently received OFDM symbol, the pilot tone of the currently received OFDM symbol is determined The frequency domain data of symbol.
It is preferred that the first module 201, the data to the currently received OFDM symbol are pre-processed, and are obtained The baseband frequency-domain data of the currently received OFDM symbol are specifically included：
According to equation below, the time domain data to the currently received OFDM symbol carries out Fast Fourier Transform (FFT), obtains Obtain the baseband frequency-domain data of the currently received OFDM symbol：
Wherein, YkIt is the frequency domain data on+1 subcarrier of kth of the currently received OFDM symbol, ynWork as described Time domain data on (n+1)th subcarrier of the OFDM symbol of preceding reception, N is subcarrier number, and j is imaginary unit, described to work as The baseband frequency-domain data of the OFDM symbol of preceding reception include the frequency domain data on N number of subcarrier, the frequency domain on N number of subcarrier Frequency domain data in data on portion subcarriers is the frequency domain data of frequency pilot sign.
It is preferred that the first module 201, from the baseband frequency-domain data of the currently received OFDM symbol, it is determined that The frequency domain data of the frequency pilot sign of the currently received OFDM symbol is specifically included：According to the default portion subcarriers Sequence number, determines the frequency domain data of the frequency pilot sign of currently received OFDM symbol.
It is preferred that the second unit 202, using equation below, determine the currently received OFDM symbol and with this The channel response average value of OFDM symbol adjacent OFDM symbol：
Wherein,The l+1 son for the currently received OFDM symbol and with the OFDM symbol adjacent OFDM symbol Channel response average value on carrier wave,It is the frequency domain number of the frequency pilot sign on the l+1 subcarrier of default pilot frequency sequence According to conjugation, Y1, lIt is the frequency domain data of the frequency pilot sign on the l+1 subcarrier of the currently received OFDM symbol, Y0, l It is the frequency domain data with the frequency pilot sign of the currently received OFDM symbol adjacent OFDM symbol on the l+1 subcarrier, M It is the sequence number set of the portion subcarriers.
It is preferred that the second unit 202, using equation below, determines the noise of the currently received OFDM symbol Power
Wherein,It is the currently received OFDM symbol noise power,For the currently received OFDM symbol and With the conjugation of the channel response average value on the l+1 subcarrier of the OFDM symbol adjacent OFDM symbol, P currently connect for described The number of frequency pilot sign in the OFDM symbol of receipts,For the currently received OFDM symbol and adjacent with the OFDM symbol The mould of the channel response average value on the l+1 subcarrier of OFDM symbol, Im is represented and is taken imaginary part.
It is preferred that the 3rd unit 203 specifically for：
According to the baseband frequency-domain data of the currently received OFDM symbol, the currently received OFDM symbol is determined Mean power is：
The noise work(of mean power according to the currently received OFDM symbol and the currently received OFDM symbol Rate, the signal power for determining the currently received OFDM symbol is：
Determine the signal power of the currently received OFDM symbol and the noise work(of the currently received OFDM symbol The ratio of rate is
Wherein, SNR is the signal to noise ratio of the currently received OFDM symbol.
In sum, the embodiment of the present application is provided signal-noise ratio estimation method and device, by determining adjacent OFDM symbol Frequency pilot sign frequency domain data, determine the channel response average value of adjacent OFDM symbol, and average according to the channel response Value determines the current noise power for receiving OFDM symbol, and the noise power further with the OFDM symbol determines OFDM symbol Signal to noise ratio, influence of the frequency deviation to signal-to-noise ratio (SNR) estimation can be resisted, such that it is able to improve the signal-to-noise ratio (SNR) estimation degree of accuracy.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program Product.Therefore, the application can be using the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware Apply the form of example.And, the application can be used and wherein include the computer of computer usable program code at one or more The shape of the computer program product implemented in usable storage medium (including but not limited to magnetic disk storage and optical memory etc.) Formula.
The application is the flow with reference to method, equipment (system) and computer program product according to the embodiment of the present application Figure and/or block diagram are described.It should be understood that every first-class during flow chart and/or block diagram can be realized by computer program instructions The combination of flow and/or square frame in journey and/or square frame and flow chart and/or block diagram.These computer programs can be provided The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce A raw machine so that produced for reality by the instruction of computer or the computing device of other programmable data processing devices The device of the function of being specified in present one flow of flow chart or multiple one square frame of flow and/or block diagram or multiple square frames.
These computer program instructions may be alternatively stored in can guide computer or other programmable data processing devices with spy In determining the computer-readable memory that mode works so that instruction of the storage in the computer-readable memory is produced and include finger Make the manufacture of device, the command device realize in one flow of flow chart or multiple one square frame of flow and/or block diagram or The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented treatment, so as in computer or The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one The step of function of being specified in individual square frame or multiple square frames.
Obviously, those skilled in the art can carry out the essence of various changes and modification without deviating from the application to the application God and scope.So, if these modifications of the application and modification belong to the scope of the application claim and its equivalent technologies Within, then the application is also intended to comprising these changes and modification.

Claims (12)

1. a kind of signal-noise ratio estimation method, it is characterised in that the method includes：
Determine the frequency domain data of the frequency pilot sign of currently received orthogonal frequency division multiplex OFDM symbol, and with the OFDM symbol phase The frequency domain data of the frequency pilot sign of adjacent OFDM symbol；
Using the frequency domain data, the currently received OFDM symbol and the letter with the OFDM symbol adjacent OFDM symbol are determined Road responds average value, and according to the channel response average value, determines the noise power of the currently received OFDM symbol；
According to the noise power of the currently received OFDM symbol, the signal to noise ratio of the currently received OFDM symbol is determined.
2. method according to claim 1, it is characterised in that determine the frequency of the frequency pilot sign of currently received OFDM symbol Numeric field data, specifically includes：
Currently received OFDM symbol is pre-processed, the baseband frequency-domain data of the currently received OFDM symbol are obtained；
From the baseband frequency-domain data of the currently received OFDM symbol, the pilot tone of the currently received OFDM symbol is determined The frequency domain data of symbol.
3. method according to claim 2, it is characterised in that pre-processed to currently received OFDM symbol, obtains The baseband frequency-domain data of the currently received OFDM symbol are specifically included：
Fast Fourier Transform (FFT) is carried out to the time domain data of the currently received OFDM symbol using equation below, obtains described The baseband frequency-domain data of currently received OFDM symbol：
Y k = Σ n = 0 N - 1 y n e - j 2 π N k n , k ∈ [ 0 , N - 1 ] , n ∈ [ 0 , N - 1 ] ;
Wherein, YkIt is the frequency domain data on+1 subcarrier of kth of the currently received OFDM symbol, ynCurrently connect for described Time domain data on (n+1)th subcarrier of the OFDM symbol of receipts, N is subcarrier number, and j is imaginary unit, described currently to connect The baseband frequency-domain data of the OFDM symbol of receipts include the frequency domain data on N number of subcarrier, the frequency domain data on N number of subcarrier Frequency domain data on middle portion subcarriers is the frequency domain data of frequency pilot sign.
4. method according to claim 3, it is characterised in that from the baseband frequency-domain number of the currently received OFDM symbol In, determine that the frequency domain data of the frequency pilot sign of the currently received OFDM symbol is specifically included：According to the default portion The sequence number of molecule carrier wave, determines the frequency domain data of the frequency pilot sign of currently received OFDM symbol.
5. method according to claim 4, it is characterised in that use equation below, determine the currently received OFDM Symbol and the channel response average value with the OFDM symbol adjacent OFDM symbol：
H ^ l = C l * 2 ( Y 0 , l + Y 1 , l ) , l ∈ M ;
Wherein,The l+1 subcarrier for the currently received OFDM symbol and with the OFDM symbol adjacent OFDM symbol On channel response average value,It is the frequency domain data of the frequency pilot sign on the l+1 subcarrier of default pilot frequency sequence Conjugation, Y1, lIt is the frequency domain data of the frequency pilot sign on the l+1 subcarrier of the currently received OFDM symbol, Y0, lBe with Frequency domain data of the frequency pilot sign of the currently received OFDM symbol adjacent OFDM symbol on the l+1 subcarrier, M is institute State the sequence number set of portion subcarriers.
6. method according to claim 5, it is characterised in that use equation below, determine the currently received OFDM The noise power of symbol：
W ^ = 4 P Σ l ∈ M [ Im ( Y 1 , l C 1 * H ^ l * | H ^ l | ) ] 2 ;
Wherein,It is the currently received OFDM symbol noise power,For the currently received OFDM symbol and with this The conjugation of the channel response average value on the l+1 subcarrier of OFDM symbol adjacent OFDM symbol, P is described currently received The number of frequency pilot sign in OFDM symbol,Accorded with for the currently received OFDM symbol and with the OFDM symbol adjacent OFDM Number the l+1 subcarrier on channel response average value mould, Im represent take imaginary part.
7. a kind of signal-to-noise ratio (SNR) estimation device, it is characterised in that the device includes：
First module, the frequency domain data of the frequency pilot sign for determining currently received orthogonal frequency division multiplex OFDM symbol, and With the frequency domain data of the frequency pilot sign of the OFDM symbol adjacent OFDM symbol；
Second unit, for utilize the frequency domain data, determine the currently received OFDM symbol and with the OFDM symbol phase The channel response average value of adjacent OFDM symbol, and according to the channel response average value, determine the currently received OFDM symbols Number noise power；
Unit the 3rd, for the noise power according to the currently received OFDM symbol, determines the currently received OFDM The signal to noise ratio of symbol.
8. device according to claim 7, it is characterised in that the first module, determines currently received OFDM symbol Frequency pilot sign frequency domain data, specifically include：
Data to currently received OFDM symbol are pre-processed, and obtain the baseband frequency-domain of the currently received OFDM symbol Data；
From the baseband frequency-domain data of the currently received OFDM symbol, the pilot tone of the currently received OFDM symbol is determined The frequency domain data of symbol.
9. device according to claim 8, it is characterised in that the first module, accords with to the currently received OFDM Number pre-processed, the baseband frequency-domain data for obtaining the currently received OFDM symbol are specifically included：
Using equation below, the time domain data to the currently received OFDM symbol carries out Fast Fourier Transform (FFT), obtains institute State the baseband frequency-domain data of currently received OFDM symbol：
Y k = Σ n = 0 N - 1 y n e - j 2 π N k n , k ∈ [ 0 , N - 1 ] , n ∈ [ 0 , N - 1 ] ;
Wherein, YkIt is the frequency domain data on+1 subcarrier of kth of the currently received OFDM symbol, ynCurrently connect for described Time domain data on (n+1)th subcarrier of the OFDM symbol of receipts, N is subcarrier number, and j is imaginary unit, described currently to connect The baseband frequency-domain data of the OFDM symbol of receipts include the frequency domain data on N number of subcarrier, the frequency domain data on N number of subcarrier Frequency domain data on middle portion subcarriers is the frequency domain data of frequency pilot sign.
10. device according to claim 9, it is characterised in that the first module, accords with from the currently received OFDM Number baseband frequency-domain data in, determine that the frequency domain data of the frequency pilot sign of the currently received OFDM symbol is specifically included：Root According to the sequence number of the default portion subcarriers, the frequency domain data of the frequency pilot sign of currently received OFDM symbol is determined.
11. devices according to claim 10, it is characterised in that the second unit, using equation below, it is determined that described Currently received OFDM symbol and the channel response average value with the OFDM symbol adjacent OFDM symbol：
H ^ l = C l * 2 ( Y 0 , l + Y 1 , l ) , l ∈ M ;
Wherein,The l+1 subcarrier for the currently received OFDM symbol and with the OFDM symbol adjacent OFDM symbol On channel response average value,It is the frequency domain data of the frequency pilot sign on the l+1 subcarrier of default pilot frequency sequence Conjugation, Y1, lIt is the frequency domain data of the frequency pilot sign on the l+1 subcarrier of the currently received OFDM symbol, Y0, lBe with Frequency domain data of the frequency pilot sign of the currently received OFDM symbol adjacent OFDM symbol on the l+1 subcarrier, M is institute State the sequence number set of portion subcarriers.
12. devices according to claim 11, it is characterised in that the second unit, using equation below, calculate described The noise power of currently received OFDM symbol：
W ^ = 4 P Σ l ∈ M [ Im ( Y 1 , l C 1 * H ^ l * | H ^ l | ) ] 2 ;
Wherein,It is the currently received OFDM symbol noise power,For the currently received OFDM symbol and with this The conjugation of the channel response average value on the l+1 subcarrier of OFDM symbol adjacent OFDM symbol, P is described currently received The number of frequency pilot sign in OFDM symbol,Accorded with for the currently received OFDM symbol and with the OFDM symbol adjacent OFDM Number the l+1 subcarrier on channel response average value mould, Im represent take imaginary part.
CN201710265465.3A 2017-04-21 2017-04-21 Signal-to-noise ratio estimation method and device Active CN106921450B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710265465.3A CN106921450B (en) 2017-04-21 2017-04-21 Signal-to-noise ratio estimation method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710265465.3A CN106921450B (en) 2017-04-21 2017-04-21 Signal-to-noise ratio estimation method and device

Publications (2)

Publication Number Publication Date
CN106921450A true CN106921450A (en) 2017-07-04
CN106921450B CN106921450B (en) 2020-11-06

Family

ID=59567583

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710265465.3A Active CN106921450B (en) 2017-04-21 2017-04-21 Signal-to-noise ratio estimation method and device

Country Status (1)

Country Link
CN (1) CN106921450B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114124294A (en) * 2021-04-13 2022-03-01 中兴通讯股份有限公司 Adaptive modulation coding method, base station and storage medium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101800728A (en) * 2010-03-08 2010-08-11 马红梅 OFDM (Orthogonal Frequency Division Multiplexing) related coefficient signal-to-noise ratio estimation algorithm
CN105610755A (en) * 2015-12-21 2016-05-25 航天恒星科技有限公司 Frequency offset estimation method and apparatus for burst-mode signal
CN105635020A (en) * 2015-12-25 2016-06-01 浙江大华技术股份有限公司 OFDM sampling frequency deviation and carrier frequency deviation estimation method and device
US20160315791A1 (en) * 2014-06-05 2016-10-27 Intel IP Corporation Methods and devices for channel estimation and ofdm receiver

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101800728A (en) * 2010-03-08 2010-08-11 马红梅 OFDM (Orthogonal Frequency Division Multiplexing) related coefficient signal-to-noise ratio estimation algorithm
US20160315791A1 (en) * 2014-06-05 2016-10-27 Intel IP Corporation Methods and devices for channel estimation and ofdm receiver
CN105610755A (en) * 2015-12-21 2016-05-25 航天恒星科技有限公司 Frequency offset estimation method and apparatus for burst-mode signal
CN105635020A (en) * 2015-12-25 2016-06-01 浙江大华技术股份有限公司 OFDM sampling frequency deviation and carrier frequency deviation estimation method and device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114124294A (en) * 2021-04-13 2022-03-01 中兴通讯股份有限公司 Adaptive modulation coding method, base station and storage medium

Also Published As

Publication number Publication date
CN106921450B (en) 2020-11-06

Similar Documents

Publication Publication Date Title
CN100542158C (en) In communication system, estimate the apparatus and method of interference and noise
CN100384114C (en) OFDM sending/receiving device
CN101938435B (en) Time bias estimation device and method for orthogonal frequency division multiplexing system
CN101888351B (en) Channel estimating apparatus and method thereof
CN101989968A (en) Frequency offset estimation method and device
CN101547062A (en) Method and device for correcting frequency deviation
US10334605B2 (en) Time domain pilot of single-carrier MIMO system and synchronization method thereof
CN1921463B (en) Communication channel estimation method and realizing device for crossing frequency division multiplexing mobile communication system
CN103379078B (en) A kind of method and apparatus of frequency domain equalization detection
CN103595664A (en) Channel estimation method and device in multiple-receiving antenna system
CN106656441A (en) Method and device for improving reliability of communication between vehicles
CN101726720A (en) Receiving apparatus, moving angle estimation method, program and wireless communication system
EP2515459A1 (en) Frequency offset compensation and equalization method and device in an orthogonal frequency division multiplexing system
CN106254283A (en) Minimize the intersymbol interference in ofdm signal
CN108989259B (en) Time offset estimation method and system for narrow-band physical uplink shared channel of wireless comprehensive measurement instrument
CN104065610A (en) Method for reducing PAPR of OFDM system through improved SLM algorithm
CN104253772B (en) The channel estimation methods of ofdm system
CN102111363A (en) Channel estimation method and device
CN107819716A (en) A kind of frequency bias compensation method and equipment based on frequency domain
CN103685089B (en) Numerical data quenching frequency bias estimation
CN106850482B (en) A kind of frequency deviation processing method and system
CN103167549A (en) Measuring reference signal processing method and device
CN105162533B (en) Transmitter amplitude imbalance and phase imbalance measuring method
CN105991484A (en) Frequency offset estimation method and frequency offset estimation device
CN103916342A (en) Signal-to-noise-ratio 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
TA01 Transfer of patent application right

Effective date of registration: 20200925

Address after: Room 1201, building a, 1181 Bin'an Road, Changhe street, Binjiang District, Hangzhou City, Zhejiang Province

Applicant after: Zhejiang Xinsheng Electronic Technology Co., Ltd

Address before: Hangzhou City, Zhejiang province Binjiang District 310053 shore road 1187

Applicant before: ZHEJIANG DAHUA TECHNOLOGY Co.,Ltd.

TA01 Transfer of patent application right
GR01 Patent grant
GR01 Patent grant