CN101895351A - Method and device for measuring noise variance - Google Patents
Method and device for measuring noise variance Download PDFInfo
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- CN101895351A CN101895351A CN2009100519347A CN200910051934A CN101895351A CN 101895351 A CN101895351 A CN 101895351A CN 2009100519347 A CN2009100519347 A CN 2009100519347A CN 200910051934 A CN200910051934 A CN 200910051934A CN 101895351 A CN101895351 A CN 101895351A
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Abstract
The embodiment of the invention discloses a method and a device for measuring a noise variance. The method comprises the following steps of: extracting a data processing unit from a received signal, wherein the data processing unit at least comprises a sub-frame; acquiring adjacent reference signals on a time frequency domain from the data processing unit; and calculating the noise variance of the received signal according to the difference of the adjacent reference signals on the time frequency domain. Through the embodiment of the invention, the accuracy of measuring the noise variance can be improved.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of method of measurement and device of noise variance.
Background technology
In various wireless communication systems, noise testing all has bigger influence for receptivity, and it can reflect the quality of link.Wherein, in noise testing, of paramount importance is the measurement of noise variance.For example, for the descending MMSE commonly used of LTE (Long Term Evolution, Long Term Evolution) (Minimum Mean Squared Error, least mean-square error is estimated) detection method, the accuracy of noise variance will directly influence the detection performance of MMSE; The soft bit of demodulation is sent into before the decoder, and the LLR weighting of the soft bit of demodulation is needed SNR information and noise variance information, and the accuracy of noise variance will influence the performance of channel decoding; During link circuit self-adapting, terminal feedback CQI (Channel Quality Indicator, channel quality indication) etc. information also relates to the calculating of SNR (Signal to Noise Ratio, signal to noise ratio) and needs noise variance information, and the accuracy of noise variance will influence link throughput.Therefore, the measurement of noise variance is accurately most important for wireless communication system.
At present, the method of measurement noise variance commonly used is to measure noise variance with the difference between the reference signal position adjacent on the frequency domain or on the time domain in OFDM (Orthogonal Frequency Division Multiplexing, the OFDM) technology.
But, the inventor finds under study for action, when on frequency domain, measuring noise variance, the identical hypothesis of channel impulse response that is based on adjacent reference signal place on the frequency domain is carried out, but, when having only correlation when reference signal place interchannel adjacent on the frequency domain big, just reliable based on the hypothesis that the channel impulse response at adjacent reference signal place on the frequency domain is identical, thus the noise variance of measuring is just accurately.Usually, this hypothesis is applicable to the ofdm system of reference signal continuous distribution on the frequency domain; And for the situation that adopts discrete reference signal to distribute in the LTE system, to differ frequency range big slightly for adjacent reference signal on the frequency domain, and the correlation between the adjacent reference signal position is very poor, utilizes the error of the measured noise variance of such hypothesis bigger.Equally, when on time domain, measuring noise variance, be based on that the identical hypothesis of channel impulse response at adjacent reference signal place on the time domain carries out, but, when having only correlation when reference signal place interchannel adjacent on the time domain big, just reliable based on the hypothesis that the channel impulse response at adjacent reference signal place on the time domain is identical, thus the noise variance of measuring is just accurate.Usually, this hypothesis is applicable to the ofdm system or the terminal to moving at a slow speed of reference signal continuous distribution on the time domain; And for the situation that adopts discrete reference signal to distribute in the LTE system, it is big slightly that adjacent reference signal differs the period on the time domain, and the correlation between the adjacent reference signal position is very poor, utilizes the same error of the measured noise variance of such hypothesis also bigger.
Summary of the invention
The embodiment of the invention provides a kind of method of measurement and device of noise variance, to improve the accuracy that noise variance is measured.
The embodiment of the invention discloses a kind of method of measurement of noise variance, comprising: extract data processing unit from received signal, described data processing unit comprises a subframe at least; From described data processing unit, obtain reference signal adjacent on the time-frequency domain; Calculate the noise variance of described received signal according to the difference at reference signal place adjacent on the time-frequency domain.
The embodiment of the invention also discloses a kind of method of measurement of noise variance, comprising: extract data processing unit from received signal, described data processing unit comprises a subframe at least; From described data processing unit, obtain adjacent reference signal on reference signal adjacent on adjacent reference signal on the time domain, the frequency domain and the time-frequency domain respectively; Difference according to reference signal place adjacent on the difference at reference signal place adjacent on the difference at reference signal place adjacent on the time domain, the frequency domain and the time-frequency domain calculates first noise variance, second noise variance and the 3rd noise variance respectively; The size of more described first noise variance, second noise variance and the 3rd noise variance is with the noise variance of the minimum noise variance as described received signal.
The embodiment of the invention also discloses a kind of method of measurement of noise variance, comprising: extract data processing unit from received signal, described data processing unit comprises a subframe at least; From described data processing unit, extract adjacent reference signal on adjacent reference signal on the time domain and the frequency domain respectively; Difference according to reference signal place adjacent on the difference at reference signal place adjacent on the time domain and the frequency domain calculates first noise variance and second noise variance respectively; The size of more described first noise variance and second noise variance is with the noise variance of the minimum noise variance as described received signal.
The embodiment of the invention also discloses a kind of measurement mechanism of noise variance, comprising: extraction unit, be used for extracting data processing unit from received signal, described data processing unit comprises a subframe at least; Acquiring unit is used for obtaining reference signal adjacent on the time-frequency domain from the data processing unit that described extraction unit extracts; Computing unit is used for calculating according to the difference at reference signal place adjacent on the time-frequency domain noise variance of described received signal.
The embodiment of the invention also discloses a kind of measurement mechanism of noise variance, comprising: extraction unit, be used for extracting data processing unit from received signal, described data processing unit comprises a subframe at least; Acquiring unit is used for obtaining reference signal adjacent on reference signal adjacent on reference signal adjacent on the time domain, the frequency domain and the time-frequency domain respectively from described data processing unit; Computing unit, the difference that is used for respectively reference signal place adjacent on the difference at reference signal place adjacent on the difference, frequency domain according to reference signal place adjacent on the time domain and the time-frequency domain calculates first noise variance, second noise variance and the 3rd noise variance; Comparing unit is used for the size of more described first noise variance, second noise variance and the 3rd noise variance, with the noise variance of the minimum noise variance as described received signal.
The embodiment of the invention also discloses a kind of measurement mechanism of noise variance, comprising: extraction unit, be used for extracting data processing unit from received signal, described data processing unit comprises a subframe at least; Acquiring unit is used for extracting adjacent reference signal on adjacent reference signal on the time domain and the frequency domain respectively from described data processing unit; Computing unit is used for respectively calculating first noise variance and second noise variance according to the difference at reference signal place adjacent on the difference at reference signal place adjacent on the time domain and the frequency domain; Comparing unit is used for the size of more described first noise variance and second noise variance, with the noise variance of the minimum noise variance as described received signal.
As can be seen from the above-described embodiment, on adopting time-frequency domain during the difference calculating noise variance at adjacent reference signal place, owing to be better than the correlation of reference signal place interchannel adjacent on frequency domain or the time domain on the whole in the correlation of reference signal place interchannel adjacent on the time-frequency domain, thereby the noise variance that the difference by adjacent reference signal place on the time-frequency domain calculates has also correspondingly improved accuracy.
When the difference at adjacent reference signal place calculates first noise variance and second noise variance on the difference at adjacent reference signal place and the frequency domain on again respectively according to time domain, again with the minimum value among the three during as the noise variance of received signal, because noise variance is more little, error is also just more little, thereby can further improve the accuracy of noise variance.
In addition, only compare first noise variance and second noise variance value, with the noise variance of the minimum value among both as received signal, more little according to noise variance, the principle that error is also more little, not only can improve the accuracy of noise variance, simultaneously, also can further reduce the amount of calculation of noise variance measuring process.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of an embodiment of the method for measurement of a kind of noise variance of the present invention;
Fig. 2 is the flow chart of another embodiment of the method for measurement of a kind of noise variance of the present invention;
Fig. 3 is the flow chart of another embodiment of the method for measurement of a kind of noise variance of the present invention;
Fig. 4 is the distribution schematic diagram of a kind of reference signal in the LTE of the present invention system;
Fig. 5 is the flow chart of another embodiment of the method for measurement of a kind of noise variance of the present invention;
Fig. 6 is the performance schematic diagram of ETU channel relevancy of the present invention;
Fig. 7 is the structure chart of an embodiment of the measurement mechanism of a kind of noise variance of the present invention;
Fig. 8 is the flow chart of another embodiment of the measurement mechanism of a kind of noise variance of the present invention;
Fig. 9 is the flow chart of another embodiment of the measurement mechanism of a kind of noise variance of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the embodiment of the invention is described in detail below in conjunction with accompanying drawing.
Embodiment one
See also Fig. 1, it is the flow chart of an embodiment of the method for measurement of a kind of noise variance of the present invention, and this method may further comprise the steps:
Step 101: extract data processing unit from received signal, described data processing unit comprises a subframe at least;
Step 102: from described data processing unit, obtain reference signal adjacent on the time-frequency domain;
Wherein, obtaining reference signal adjacent on the time-frequency domain from data processing unit specifically can comprise: on the time domain on the reference signal of pairing OFDM symbolic number minimum or the frequency domain reference signal of sub-carrier number minimum be set to first reference signal; In all subcarrier scopes that described data processing unit comprised, search respectively on time domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on time domain; , search respectively on frequency domain and the most adjacent reference signal of each first reference signal on time domain the adjacent reference signal from described first reference signal, obtain described first reference signal adjacent reference signal on time-frequency domain; In the residue reference signal except described first reference signal, the first new reference signal is set, obtain described new first reference signal adjacent reference signal on time-frequency domain, up in described data processing unit, finding all till reference signal adjacent on the time-frequency domain.
Obtaining reference signal adjacent on the time-frequency domain from data processing unit specifically also can comprise: on the time domain on the reference signal of pairing OFDM symbolic number minimum or the frequency domain reference signal of sub-carrier number minimum be set to first reference signal; In all OFDM symbolic ranges that described data processing unit comprised, search respectively on frequency domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on frequency domain; , search respectively on time domain and the most adjacent reference signal of each first reference signal on frequency domain the adjacent reference signal from described first reference signal, obtain described first reference signal adjacent reference signal on time-frequency domain; In the residue reference signal except described first reference signal, the first new reference signal is set, obtain the described new adjacent reference signal of first reference signal on time-frequency domain, up in described data processing unit, finding all till reference signal adjacent on the time-frequency domain.
Step 103: the noise variance that calculates described received signal according to the difference at reference signal place adjacent on the time-frequency domain.
Wherein, described difference according to reference signal place adjacent on the time-frequency domain noise variance that calculates described received signal specifically can comprise:
According to formula
Calculate the noise variance of described received signal, wherein,
Represent described noise variance, L
RSRepresent to comprise in the described data processing unit OFDM symbolic number of reference signal, N
RSBe illustrated in the sub-carrier number that comprises reference signal in the OFDM symbol,
With
A pair of each other reference signal adjacent on time-frequency domain, x
K, lWith
Be respectively
With
The transmission signal at place.
As can be seen from the above-described embodiment, on adopting time-frequency domain during the difference calculating noise variance at adjacent reference signal place, owing to be better than the correlation of reference signal place interchannel adjacent on frequency domain or the time domain on the whole in the correlation of reference signal place interchannel adjacent on the time-frequency domain, thereby the noise variance that the difference by adjacent reference signal place on the time-frequency domain calculates has also correspondingly improved accuracy.
Embodiment two
See also Fig. 2, it is another embodiment flow chart of the method for measurement of a kind of noise of the present invention, the difference of a present embodiment and a last embodiment is, except obtaining reference signal adjacent on the time-frequency domain, and according to outside the noise variance under the difference calculating time-frequency domain at reference signal place adjacent on the time-frequency domain, also obtain simultaneously on the time domain and frequency domain on adjacent reference signal, and calculate under the time domain and the noise variance under the frequency domain according to the difference at adjacent reference signal place on the time domain and on the frequency domain, with the noise variance under the time-frequency domain, noise variance under the time domain and the minimum value in the noise variance under the frequency domain are as the noise variance of received signal.It specifically may further comprise the steps:
Step 201: extract data processing unit from received signal, described data processing unit comprises a subframe at least;
Step 202: from described data processing unit, obtain adjacent reference signal on reference signal adjacent on adjacent reference signal on the time domain, the frequency domain and the time-frequency domain respectively;
Step 203: the difference according to reference signal place adjacent on the difference at reference signal place adjacent on the difference at reference signal place adjacent on the time domain, the frequency domain and the time-frequency domain calculates first noise variance, second noise variance and the 3rd noise variance respectively;
Wherein, describedly calculate first noise variance, second noise variance and the 3rd noise variance according to the difference at reference signal place adjacent on the difference at reference signal place adjacent on the difference at reference signal place adjacent on the time domain, the frequency domain and the time-frequency domain respectively and specifically can comprise: according to formula
Calculate described first noise variance; According to formula
Calculate described second noise variance; According to formula
Calculate described the 3rd noise variance, wherein,
Represent described noise variance, L
RSRepresent to comprise in the described data processing unit OFDM symbolic number of reference signal, N
RSBe illustrated in the sub-carrier number that comprises reference signal in the OFDM symbol,
With
A pair of each other reference signal adjacent on time domain,
With
A pair of each other reference signal adjacent on frequency domain,
With
A pair of each other reference signal adjacent on time-frequency domain, x
K, lWith
Be respectively
With
The transmission signal at place, x
K, lWith
Be respectively
With
The transmission signal at place, x
K, lWith
Be respectively
With
The transmission signal at place.
Step 204: the size of more described first noise variance, second noise variance and the 3rd noise variance, with the noise variance of minimum noise variance as described received signal.
According to the foregoing description as can be seen, when the difference at adjacent reference signal place calculates first noise variance and second noise variance on the difference at adjacent reference signal place and the frequency domain on again respectively according to time domain, again with the minimum value among the three during as the noise variance of received signal, because noise variance is more little, error is also just more little, thereby can further improve the accuracy of noise variance.
Embodiment three
See also Fig. 3, it is another embodiment flow chart of the method for measurement of a kind of noise of the present invention, the difference of a present embodiment and a last embodiment is, obtain on the time domain and frequency domain on adjacent reference signal, and according to the difference at adjacent reference signal place on the time domain and on the frequency domain calculate under the time domain and frequency domain noise variance down after, direct with the noise variance under the time domain and the minimum value in the noise variance under the frequency domain noise variance as received signal.It specifically may further comprise the steps:
Step 301: extract data processing unit from received signal, described data processing unit comprises a subframe at least;
Step 302: from described data processing unit, extract adjacent reference signal on adjacent reference signal on the time domain and the frequency domain respectively;
Step 303: the difference according to reference signal place adjacent on the difference at reference signal place adjacent on the time domain and the frequency domain calculates first noise variance and second noise variance respectively;
Step 304: the size of more described first noise variance and second noise variance, with the noise variance of minimum noise variance as described received signal.
According to above-mentioned enforcement as can be seen, only compare first noise variance and second noise variance value, with the noise variance of the minimum value among both as received signal, more little according to noise variance, the principle that error is also more little, not only can improve the accuracy of noise variance, simultaneously, also can further reduce the amount of calculation of noise variance measuring process.
Embodiment four
At above-mentioned two embodiment, provide a concrete application scenarios to describe the method for measurement of noise variance in detail below.See also Fig. 4, be the distribution schematic diagram of a kind of reference signal in the LTE of the present invention system.The schematic diagram that reference signal distributes among the LTE, wherein, the grey color part among the figure is represented the position at reference signal place, all the other represent the position at non-reference signal place.In order to simplify, in only the drawn length (during general cyclic prefix CP) of a subframe of time domain direction, at frequency domain direction 12 subcarriers that only drawn, and only represented reference signal distribution situation on the transmitting antenna port among the figure.At reference signal distribution map shown in Figure 3, the embodiment of the invention provides another embodiment of a kind of method of measurement of noise variance, see also Fig. 5, it is the flow chart of another embodiment of the method for measurement of a kind of noise variance of the present invention, specifically may further comprise the steps:
Step 501: end side receives the signal of coming from channel by reception antenna, obtains received signal;
Wherein, present embodiment is an example to receive received signal on a reception antenna only, and the method for measuring noise variance according to described received signal is described, the method for measurement of noise is equally applicable to the situation of many antennas in the embodiment of the invention.
Step 502: from received signal, extract data processing unit;
Wherein, described data processing unit comprises a subframe at least.In order to simplify, in the present embodiment, data processing unit is a subframe.
Wherein, if the reference signal of pairing OFDM symbolic number minimum is set to first reference signal, r on the time domain
0,0And r
6,0Pairing OFDM symbolic number is 1, then r
0,0And r
6,0It is first reference signal; If the reference signal of sub-carrier number minimum is set to first reference signal, r on the frequency domain
0,0And r
0,7Pairing sub-carrier number is 1, then r
0,0And r
0,7It is first reference signal.Below with r
0,0And r
6,0It is the method that the first reference signal explanation is obtained reference signal adjacent on the time-frequency domain.
Step 506 is except the first reference signal r
0,0And r
6,0Outside in the remaining reference signal, repeating step 404 and step 405 are up to finding all in described data processing unit till reference signal adjacent on the time-frequency domain;
In like manner, obtain r
0,7Adjacent reference signal r on time-frequency domain
3,11, obtain r
6,7Adjacent reference signal r on time-frequency domain
9,11
In above-mentioned steps 504 and step 505, except first execution in step 504 again the execution in step 505, all right first execution in step 505, execution in step 504 again, promptly earlier in all OFDM symbolic ranges that described data processing unit comprised, search respectively on frequency domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on frequency domain; Again from described reference signal the most adjacent with each first reference signal on frequency domain, search respectively on time domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on time-frequency domain.
Step 507: the noise variance that calculates received signal according to the difference at reference signal place adjacent on the time-frequency domain.
Wherein, the difference by reference signal place adjacent on the time-frequency domain can obtain formula
Calculate the noise variance of described received signal according to described formula, wherein,
The noise variance of representing described received signal, L
RSRepresent to comprise in the described data processing unit OFDM symbolic number of reference signal, N
RSBe illustrated in the sub-carrier number that comprises reference signal in the OFDM symbol,
With
A pair of each other reference signal adjacent on time-frequency domain, x
K, lWith
Be respectively
With
The transmission signal at place.
Need to prove, in the actual conditions different cell reference signals is had different side-play amounts on frequency domain, different transmitting antenna ports is had different distributions, but the relative position between each reference signal substantially to Fig. 4 in similar, what all adopt is this discrete reference signal location mode.
The difference of coming further analysis and explanation to work as reference signal place adjacent on the employing time-frequency domain below calculates the noise variance of received signal can mention the accuracy that noise variance is measured.
When calculating the noise variance of received signal with the difference at the adjacent reference signal place on time domain or the frequency domain, the accuracy of noise variance is to be determined by the correlation between the adjacent reference signal on time domain or the frequency domain, see also Fig. 6, it is for the performance schematic diagram of ETU channel relevancy of the present invention, wherein, the correlation of adjacent reference signal place interchannel on mark " time " curve representation time domain, the channel relevancy at adjacent reference signal place on the curve representation frequency domain of mark " fre ", the channel relevancy at adjacent reference signal place on the curve representation time-frequency domain of mark " time-fre ", because the correlation on time domain and the frequency domain is separate, therefore, the channel relevancy at adjacent reference signal place can obtain with the correlation product at adjacent reference signal place on the correlation at adjacent reference signal place on the time domain and the frequency domain on the time-frequency domain.Can infer from Fig. 6,, when terminal low speed moves, adopt and utilize the accuracy of the difference calculating noise variance at adjacent reference signal place on the time domain to be better than the accuracy of utilizing the difference calculating noise variance at adjacent reference signal place on the frequency domain for the ETU channel; When terminal high-speed moves, employing utilizes the accuracy of the difference calculating noise variance at adjacent reference signal place on the frequency domain to be better than the accuracy of utilizing the difference calculating noise variance at adjacent reference signal place on the time domain, and the accuracy of difference calculating noise variance at adjacent reference signal place will be better than calculating on frequency domain and the time domain on the whole simultaneously on the utilization time-frequency domain.
In addition, when in step 507, when calculating noise variance by the difference of the adjacent reference signal on the time-frequency domain, while is according to the difference calculating noise variance of adjacent reference signal on time domain and the frequency domain, the size of 3 noise variances relatively then is with the noise variance of the minimum noise variance as received signal.Wherein, can be according to formula
Calculate the noise variance under the time domain, according to formula
Calculate the noise variance under the frequency domain, here,
Represent described noise variance, L
RSRepresent to comprise in the described data processing unit OFDM symbolic number of reference signal, N
RSBe illustrated in the sub-carrier number that comprises reference signal in the OFDM symbol,
With
A pair of each other reference signal adjacent on time domain,
With
A pair of each other reference signal adjacent on frequency domain, x
K, lWith
Be respectively
With
The transmission signal at place, x
K, lWith
Be respectively
With
The transmission signal at place.
Embodiment five
Corresponding with the method for measurement of above-mentioned a kind of noise variance, the embodiment of the invention also provides a kind of measurement mechanism of noise variance.See also Fig. 7, it is an example structure figure of the measurement mechanism of a kind of noise variance of the present invention, and this device comprises: extraction unit 701, acquiring unit 702 and computing unit 703.Operation principle below in conjunction with this device is further introduced its internal structure and annexation.
Acquiring unit 702 is used for obtaining reference signal adjacent on the time-frequency domain from the data processing unit that described extraction unit extracts;
Wherein, acquiring unit 702 can comprise that unit 7021, first o'clock domain lookup unit 7022 and first frequency domain are set searches unit 7023,
Unit 7021 is set, and the reference signal that is used for sub-carrier number minimum on the reference signal of pairing OFDM symbolic number minimum on the time domain or the frequency domain is set to first reference signal;
First o'clock domain lookup unit 7022, in all subcarrier scopes that are used for comprising from described data processing unit, search respectively on time domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on time domain;
First frequency domain is searched unit 7023, be used for from described first reference signal adjacent reference signal on time domain, search respectively on frequency domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on time-frequency domain.
Perhaps, acquiring unit 702 also can comprise the unit is set, second frequency domain is searched unit and second o'clock domain lookup unit,
The unit is set, and the reference signal that is used for sub-carrier number minimum on the reference signal of pairing OFDM symbolic number minimum on the time domain or the frequency domain is set to first reference signal;
Second frequency domain is searched the unit, in all OFDM symbolic ranges that are used for comprising from described data processing unit, search respectively on frequency domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on frequency domain;
Second o'clock domain lookup unit, be used for from described first reference signal adjacent reference signal on frequency domain, search respectively on time domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on time-frequency domain.
As can be seen from the above-described embodiment, on adopting time-frequency domain during the difference calculating noise variance at adjacent reference signal place, owing to be better than the correlation of reference signal place interchannel adjacent on frequency domain or the time domain on the whole in the correlation of reference signal place interchannel adjacent on the time-frequency domain, thereby the noise variance that the difference by adjacent reference signal place on the time-frequency domain calculates has also correspondingly improved accuracy.
Embodiment six
Corresponding with the method for measurement of above-mentioned a kind of noise variance, the embodiment of the invention also provides a kind of measurement mechanism of noise variance.See also Fig. 8, it is another example structure figure of the measurement mechanism of a kind of noise variance of the present invention, and this device comprises extraction unit 801, acquiring unit 802, computing unit 803 and comparing unit 804.Operation principle below in conjunction with this device is further introduced its internal structure and annexation.
Acquiring unit 802 is used for obtaining adjacent reference signal on reference signal adjacent on adjacent reference signal on the time domain, the frequency domain and the time-frequency domain respectively from described data processing unit;
Comparing unit 804 is used for the size of more described first noise variance, second noise variance and the 3rd noise variance, with the noise variance of the minimum noise variance as described received signal.
Wherein, acquiring unit 802 can comprise first acquiring unit 8021, second acquisition unit 8022 and the 3rd acquiring unit 8023,
First acquiring unit 8021 is used for obtaining reference signal adjacent on the time domain respectively from described data processing unit;
Second acquisition unit 8022 is used for obtaining reference signal adjacent on the frequency domain respectively from described data processing unit;
The 3rd acquiring unit 8023 is used for obtaining reference signal adjacent on the time-frequency domain respectively from described data processing unit.
Simultaneously, the 3rd acquiring unit 8023 comprises: unit, first o'clock domain lookup unit and first frequency domain are set search the unit,
The unit is set, and the reference signal that is used for sub-carrier number minimum on the reference signal of pairing OFDM symbolic number minimum on the time domain or the frequency domain is set to first reference signal;
First o'clock domain lookup unit in all subcarrier scopes that are used for comprising from described data processing unit, searched respectively on time domain and the most adjacent reference signal of each first reference signal, obtains described first reference signal adjacent reference signal on time domain;
First frequency domain is searched the unit, be used for from described first reference signal adjacent reference signal on time domain, search respectively on frequency domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on time-frequency domain.
Perhaps, the 3rd acquiring unit 8023 also can comprise the unit is set, second frequency domain is searched unit and second o'clock domain lookup unit,
The unit is set, and the reference signal that is used for sub-carrier number minimum on the reference signal of pairing OFDM symbolic number minimum on the time domain or the frequency domain is set to first reference signal;
Second frequency domain is searched the unit, in all OFDM symbolic ranges that are used for comprising from described data processing unit, search respectively on frequency domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on frequency domain;
Second o'clock domain lookup unit, be used for from described first reference signal adjacent reference signal on frequency domain, search respectively on time domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on time-frequency domain.
First computing unit 8031 is used for according to formula
Calculate described first noise variance;
Second computing unit 8032 is used for according to formula
Calculate described second noise variance;
The 3rd computing unit 8033 is used for according to formula
Calculate described the 3rd noise variance, wherein,
Represent described noise variance, L
RSRepresent to comprise in the described data processing unit OFDM symbolic number of reference signal, N
RSBe illustrated in the sub-carrier number that comprises reference signal in the OFDM symbol,
With
A pair of each other reference signal adjacent on time domain,
With
A pair of each other reference signal adjacent on frequency domain,
With
A pair of each other reference signal adjacent on time-frequency domain, x
K, lWith
Be respectively
With
The transmission signal at place, x
K, lWith
Be respectively
With
The transmission signal at place, x
K, lWith
Be respectively
With
The transmission signal at place.
As can be seen from the above-described embodiment, when the difference at adjacent reference signal place calculates first noise variance and second noise variance on the difference at adjacent reference signal place and the frequency domain on again respectively according to time domain, again with the minimum value among the three during as the noise variance of received signal, because noise variance is more little, error is also just more little, thereby can further improve the accuracy of noise variance.
Embodiment seven
Corresponding with the method for measurement of above-mentioned a kind of noise variance, the embodiment of the invention also provides a kind of measurement mechanism of noise variance.See also Fig. 9, it is another example structure figure of the measurement mechanism of a kind of noise variance of the present invention, and this device comprises extraction unit 901, acquiring unit 902, computing unit 903 and comparing unit 904.Operation principle below in conjunction with this device is further introduced its internal structure and annexation.
Acquiring unit 902 is used for extracting adjacent reference signal on adjacent reference signal on the time domain and the frequency domain respectively from described data processing unit;
Comparing unit 904 is used for the size of more described first noise variance and second noise variance, with the noise variance of the minimum noise variance as described received signal.
By the foregoing description as can be seen, only compare first noise variance and second noise variance value, with the noise variance of the minimum value among both as received signal, more little according to noise variance, the principle that error is also more little, not only can improve the accuracy of noise variance, simultaneously, also can further reduce the amount of calculation of noise variance measuring process.
Need to prove, one of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
More than the method for measurement and the device of a kind of noise variance provided by the present invention is described in detail, used specific embodiment herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (18)
1. the method for measurement of a noise variance is characterized in that, comprising:
Extract data processing unit from received signal, described data processing unit comprises a subframe at least;
From described data processing unit, obtain reference signal adjacent on the time-frequency domain;
Calculate the noise variance of described received signal according to the difference at reference signal place adjacent on the time-frequency domain.
2. method according to claim 1 is characterized in that, describedly obtains reference signal adjacent on the time-frequency domain comprise from data processing unit:
On the time domain on the reference signal of pairing orthogonal frequency division multiplex OFDM symbolic number minimum or the frequency domain reference signal of sub-carrier number minimum be set to first reference signal;
In all subcarrier scopes that described data processing unit comprised, search respectively on time domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on time domain;
, search respectively on frequency domain and the most adjacent reference signal of each first reference signal on time domain the adjacent reference signal from described first reference signal, obtain described first reference signal adjacent reference signal on time-frequency domain;
In the residue reference signal except described first reference signal, the first new reference signal is set, obtain described new first reference signal adjacent reference signal on time-frequency domain, up in described data processing unit, finding all till reference signal adjacent on the time-frequency domain.
3. method according to claim 1 is characterized in that, describedly obtains reference signal adjacent on the time-frequency domain comprise from data processing unit:
On the time domain on the reference signal of pairing OFDM symbolic number minimum or the frequency domain reference signal of sub-carrier number minimum be set to first reference signal;
In all OFDM symbolic ranges that described data processing unit comprised, search respectively on frequency domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on frequency domain;
, search respectively on time domain and the most adjacent reference signal of each first reference signal on frequency domain the adjacent reference signal from described first reference signal, obtain described first reference signal adjacent reference signal on time-frequency domain;
In the residue reference signal except described first reference signal, the first new reference signal is set, obtain the described new adjacent reference signal of first reference signal on time-frequency domain, up in described data processing unit, finding all till reference signal adjacent on the time-frequency domain.
4. method according to claim 1 is characterized in that, the noise variance that described difference according to reference signal place adjacent on the time-frequency domain calculates described received signal comprises:
According to formula
Calculate the noise variance of described received signal, wherein,
Represent described noise variance, L
RSRepresent to comprise in the described data processing unit OFDM symbolic number of reference signal, N
RSBe illustrated in the sub-carrier number that comprises reference signal in the OFDM symbol,
With
A pair of each other reference signal adjacent on time-frequency domain, x
K, lWith
Be respectively
With
The transmission signal at place.
5. the method for measurement of a noise variance is characterized in that, comprising:
Extract data processing unit from received signal, described data processing unit comprises a subframe at least;
From described data processing unit, obtain adjacent reference signal on reference signal adjacent on adjacent reference signal on the time domain, the frequency domain and the time-frequency domain respectively;
Difference according to reference signal place adjacent on the difference at reference signal place adjacent on the difference at reference signal place adjacent on the time domain, the frequency domain and the time-frequency domain calculates first noise variance, second noise variance and the 3rd noise variance respectively;
The size of more described first noise variance, second noise variance and the 3rd noise variance is with the noise variance of the minimum noise variance as described received signal.
6. method according to claim 5 is characterized in that, describedly obtains reference signal adjacent on the time-frequency domain comprise from data processing unit:
On the time domain on the reference signal of pairing OFDM symbolic number minimum or the frequency domain reference signal of sub-carrier number minimum be set to first reference signal;
In all subcarrier scopes that described data processing unit comprised, search respectively on time domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on time domain;
From described first reference signal on time domain the adjacent reference signal in, search respectively on frequency domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on time-frequency domain;
In the residue reference signal except described first reference signal, the first new reference signal is set, obtain described new first reference signal adjacent reference signal on time-frequency domain, up in described data processing unit, finding all till reference signal adjacent on the time-frequency domain.
7. method according to claim 5 is characterized in that, describedly obtains reference signal adjacent on the time-frequency domain comprise from data processing unit:
On the time domain on the reference signal of pairing OFDM symbolic number minimum or the frequency domain reference signal of sub-carrier number minimum be set to first reference signal;
In all OFDM symbolic ranges that described data processing unit comprised, search respectively on frequency domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on frequency domain;
, search respectively on time domain and the most adjacent reference signal of each first reference signal on frequency domain the adjacent reference signal from described first reference signal, obtain described first reference signal adjacent reference signal on time-frequency domain;
In the residue reference signal except described first reference signal, the first new reference signal is set, obtain the described new adjacent reference signal of first reference signal on time-frequency domain, up in described data processing unit, finding all till reference signal adjacent on the time-frequency domain.
8. method according to claim 1, it is characterized in that, describedly calculate first noise variance, second noise variance and the 3rd noise variance according to the difference at reference signal place adjacent on the difference at reference signal place adjacent on the difference at reference signal place adjacent on the time domain, the frequency domain and the time-frequency domain respectively and comprise:
According to formula
Calculate described first noise variance;
According to formula
Calculate described second noise variance;
According to formula
Calculate described the 3rd noise variance, wherein,
Represent described noise variance, L
RSRepresent to comprise in the described data processing unit OFDM symbolic number of reference signal, N
RSBe illustrated in the sub-carrier number that comprises reference signal in the OFDM symbol,
With
A pair of each other reference signal adjacent on time domain,
With
A pair of each other reference signal adjacent on frequency domain,
With
A pair of each other reference signal adjacent on time-frequency domain, x
K, lWith
Be respectively
With
The transmission signal at place, x
K, lWith
Be respectively
With
The transmission signal at place, x
K, lWith
Be respectively
With
The transmission signal at place.
9. the method for measurement of a noise variance is characterized in that, comprising:
Extract data processing unit from received signal, described data processing unit comprises a subframe at least;
From described data processing unit, extract adjacent reference signal on adjacent reference signal on the time domain and the frequency domain respectively;
Difference according to reference signal place adjacent on the difference at reference signal place adjacent on the time domain and the frequency domain calculates first noise variance and second noise variance respectively;
The size of more described first noise variance and second noise variance is with the noise variance of the minimum noise variance as described received signal.
10. the measurement mechanism of a noise variance is characterized in that, comprising:
Extraction unit is used for extracting data processing unit from received signal, and described data processing unit comprises a subframe at least;
Acquiring unit is used for obtaining reference signal adjacent on the time-frequency domain from the data processing unit that described extraction unit extracts;
Computing unit is used for calculating according to the difference at reference signal place adjacent on the time-frequency domain noise variance of described received signal.
11. device according to claim 10 is characterized in that, described acquiring unit comprises:
The unit is set, and the reference signal that is used for sub-carrier number minimum on the reference signal of pairing OFDM symbolic number minimum on the time domain or the frequency domain is set to first reference signal;
First o'clock domain lookup unit in all subcarrier scopes that are used for comprising from described data processing unit, searched respectively on time domain and the most adjacent reference signal of each first reference signal, obtains described first reference signal adjacent reference signal on time domain;
First frequency domain is searched the unit, is used for from first reference signal adjacent reference signal on time domain, searches respectively on frequency domain and the most adjacent reference signal of each first reference signal, obtains described first reference signal adjacent reference signal on time-frequency domain.
12. device according to claim 10 is characterized in that, described acquiring unit comprises:
The unit is set, and the reference signal that is used for sub-carrier number minimum on the reference signal of pairing OFDM symbolic number minimum on the time domain or the frequency domain is set to first reference signal;
Second frequency domain is searched the unit, in all OFDM symbolic ranges that are used for comprising from described data processing unit, search respectively on frequency domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on frequency domain;
Second o'clock domain lookup unit, be used for from described first reference signal adjacent reference signal on frequency domain, search respectively on time domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on time-frequency domain.
13. the measurement mechanism of a noise variance is characterized in that, comprising:
Extraction unit is used for extracting data processing unit from received signal, and described data processing unit comprises a subframe at least;
Acquiring unit is used for obtaining reference signal adjacent on reference signal adjacent on reference signal adjacent on the time domain, the frequency domain and the time-frequency domain respectively from described data processing unit;
Computing unit, the difference that is used for respectively reference signal place adjacent on the difference at reference signal place adjacent on the difference, frequency domain according to reference signal place adjacent on the time domain and the time-frequency domain calculates first noise variance, second noise variance and the 3rd noise variance;
Comparing unit is used for the size of more described first noise variance, second noise variance and the 3rd noise variance, with the noise variance of the minimum noise variance as described received signal.
14. device according to claim 13 is characterized in that, described acquiring unit comprises:
First acquiring unit is used for obtaining reference signal adjacent on the time domain respectively from described data processing unit;
Second acquisition unit is used for obtaining reference signal adjacent on the frequency domain respectively from described data processing unit;
The 3rd acquiring unit is used for obtaining reference signal adjacent on the time-frequency domain respectively from described data processing unit.
15. device according to claim 14 is characterized in that, described the 3rd acquiring unit comprises:
The unit is set, and the reference signal that is used for sub-carrier number minimum on the reference signal of pairing OFDM symbolic number minimum on the time domain or the frequency domain is set to first reference signal;
First o'clock domain lookup unit in all subcarrier scopes that are used for comprising from described data processing unit, searched respectively on time domain and the most adjacent reference signal of each first reference signal, obtains described first reference signal adjacent reference signal on time domain;
First frequency domain is searched the unit, is used for from first reference signal adjacent reference signal on time domain, searches respectively on frequency domain and the most adjacent reference signal of each first reference signal, obtains described first reference signal adjacent reference signal on time-frequency domain.
16. device according to claim 14 is characterized in that, described acquiring unit comprises:
The unit is set, and the reference signal that is used for sub-carrier number minimum on the reference signal of pairing OFDM symbolic number minimum on the time domain or the frequency domain is set to first reference signal;
Second frequency domain is searched the unit, in all OFDM symbolic ranges that are used for comprising from described data processing unit, search respectively on frequency domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on frequency domain;
Second o'clock domain lookup unit, be used for from described first reference signal adjacent reference signal on frequency domain, search respectively on time domain and the most adjacent reference signal of each first reference signal, obtain described first reference signal adjacent reference signal on time-frequency domain.
17. device according to claim 13 is characterized in that, described computing unit comprises:
First computing unit is used for according to formula
Calculate described first noise variance;
Second computing unit is used for according to formula
Calculate described second noise variance;
The 3rd computing unit is used for according to formula
Calculate described the 3rd noise variance, wherein,
Represent described noise variance, L
RSRepresent to comprise in the described data processing unit OFDM symbolic number of reference signal, N
RSBe illustrated in the sub-carrier number that comprises reference signal in the OFDM symbol,
With
A pair of each other reference signal adjacent on time domain,
With
A pair of each other reference signal adjacent on frequency domain,
With
A pair of each other reference signal adjacent on time-frequency domain, x
K, lWith
Be respectively
With
The transmission signal at place, x
K, lWith
Be respectively
With
The transmission signal at place, x
K, lWith
Be respectively
With
The transmission signal at place.
18. the measurement mechanism of a noise variance is characterized in that, comprising:
Extraction unit is used for extracting data processing unit from received signal, and described data processing unit comprises a subframe at least;
Acquiring unit is used for extracting adjacent reference signal on adjacent reference signal on the time domain and the frequency domain respectively from described data processing unit;
Computing unit is used for respectively calculating first noise variance and second noise variance according to the difference at reference signal place adjacent on the difference at reference signal place adjacent on the time domain and the frequency domain;
Comparing unit is used for the size of more described first noise variance and second noise variance, with the noise variance of the minimum noise variance as described received signal.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543092A (en) * | 2010-12-29 | 2012-07-04 | 联芯科技有限公司 | Noise estimation method and device |
| CN103095630A (en) * | 2011-11-01 | 2013-05-08 | 联芯科技有限公司 | Noise estimating method and device of wireless communication system |
| CN111669192A (en) * | 2020-06-15 | 2020-09-15 | 珠海中慧微电子有限公司 | Method for identifying and suppressing short-time pulse interference in OFDM signal |
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| US7305056B2 (en) * | 2003-11-18 | 2007-12-04 | Ibiquity Digital Corporation | Coherent tracking for FM in-band on-channel receivers |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543092A (en) * | 2010-12-29 | 2012-07-04 | 联芯科技有限公司 | Noise estimation method and device |
| CN102543092B (en) * | 2010-12-29 | 2014-02-05 | 联芯科技有限公司 | Noise estimation method and device |
| CN103095630A (en) * | 2011-11-01 | 2013-05-08 | 联芯科技有限公司 | Noise estimating method and device of wireless communication system |
| CN103095630B (en) * | 2011-11-01 | 2016-03-09 | 联芯科技有限公司 | The method and apparatus that in wireless communication system, noise is estimated |
| CN111669192A (en) * | 2020-06-15 | 2020-09-15 | 珠海中慧微电子有限公司 | Method for identifying and suppressing short-time pulse interference in OFDM signal |
| CN111669192B (en) * | 2020-06-15 | 2021-06-29 | 珠海中慧微电子有限公司 | Method for identifying and suppressing short-time pulse interference in OFDM signal |
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