CN101132389A - Compensation method for estimation of signal to interference ratio - Google Patents
Compensation method for estimation of signal to interference ratio Download PDFInfo
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- CN101132389A CN101132389A CNA2007101236327A CN200710123632A CN101132389A CN 101132389 A CN101132389 A CN 101132389A CN A2007101236327 A CNA2007101236327 A CN A2007101236327A CN 200710123632 A CN200710123632 A CN 200710123632A CN 101132389 A CN101132389 A CN 101132389A
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Abstract
This invention relates to a compensation method for S/I ratio estimation including: A, utilizing a S/I ratio estimation method to compute an interference estimation result of S/I ratio, B, setting a threshold value to compute probability of dots of the estimation result in the threshold as the confidence factor, C, compensating the interference estimation result of the S/I ratio with the factor to get a compensated estimation value of S/I ratio.
Description
Technical field
The present invention relates to the estimation method for SIR in the digital communication system, relate in particular to a kind of method that estimation compensates to signal interference ratio, make that the signal interference ratio estimated value when hanging down signal interference ratio is more accurate, do not influence the estimation of high signal interference ratio simultaneously.
Background technology
Signal interference ratio also is called the signal noise power ratio, is very important cqi in the communication system.Used the technology of controlling at channel quality in the now increasing communication system, as power control, Adaptive Modulation and Coding, MIMO (multiple-input and multiple-output) technology, various space-time diversity technology etc.These all control technologys all are to be based upon on the basis that channel quality can accurately estimate, the whether accurate performance that directly has influence on these control technologys of the estimation of channel quality, and the signal interference ratio of received signal estimates it is extremely important and very general content in the channel quality estimation.
Received signal signal interference ratio estimation approach is a lot of now, but mostly all be that power with received signal is as signal power, with the value of the distance between the standard constellation point after received signal and the judgement as Interference Estimation, like this because during low signal interference ratio, the mistake of constellation point judgement, signal interference ratio is estimated very inaccurate in the time of will causing hanging down signal interference ratio.Be the signal of constellation point 3 as can be seen originally from the situation of Fig. 1 qpsk (modulation of quaternary phase shift keying) owing to be subjected to very big The noise, be judged into constellation point 2, become that represented line of L1 when calculating Interference Estimation so, and real Interference Estimation value that the represented line that should be L2, the value that can see Interference Estimation is because constellation point mistake in judgment and generally less than normal.In like manner, the situation of 16qam from Fig. 2 (16 modulus quadrature amplitude modulation) also can draw this conclusion, transmitting of constellation point 1 is subjected to very big noise effect, fallen near the constellation point 2, will be judged a constellation point 2 like this, like this, the estimated value of interference is the length of that line of L1 indication, and it is littler than that actual interference distance of L2 indication.So in low signal interference ratio, will cause the signal-to-jamming ratio estimation bigger than normal because Interference Estimation is less than normal.
Summary of the invention
The objective of the invention is to: proposed the compensation method that a kind of signal interference ratio is estimated, estimated in low signal interference ratio, to estimate inaccurate problem to solve the received signal signal interference ratio.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
The compensation method that a kind of signal interference ratio is estimated said method comprising the steps of:
A, calculate the Interference Estimation result of signal interference ratio with estimation method for SIR;
B, threshold value of setting are calculated the probability that the Interference Estimation result drops on the point in this threshold value, as confidence factor;
C, compensate the signal interference ratio estimated value after being compensated with the Interference Estimation result of described confidence factor to described signal interference ratio.
Described method, wherein: described confidence factor adopts following method to obtain: statistics Interference Estimation result drops on the number of the point in the described threshold value, drops on the number of the number of the point in the described threshold value divided by the total point of Interference Estimation result with the Interference Estimation result.
Described method, wherein: the setting of described thresholding should make signal interference ratio estimated value after the compensation and the error minimum between the real signal interference ratio value.
Described method, wherein: the Interference Estimation result of the signal interference ratio in the described steps A is the linear value of signal interference ratio estimated value.
Described method, wherein: adopt following concrete grammar that the signal interference ratio estimated result is compensated among the described step C: C11, multiply by the linear value of described signal interference ratio estimated value, be compensated the linear value of signal interference ratio estimated value afterwards with described confidence factor; C12, the linear value after the described compensation is converted into the dB value, is compensated back signal interference ratio estimated value.
Described method, wherein: adopt following concrete grammar that the signal interference ratio estimated result is compensated among the described step C: C21, multiply by the linear value of described signal interference ratio estimated value after described confidence factor carried out square, be compensated the linear value of signal interference ratio estimated value afterwards; C22, the linear value after the described compensation is converted into the dB value, is compensated back signal interference ratio estimated value.
Described method, wherein: adopt following concrete grammar that the signal interference ratio estimated result is compensated among the described step C: C31, the linear value of described signal interference ratio estimated value is converted into the dB value, is compensated preceding signal interference ratio estimated value; C32, multiply by signal interference ratio estimated value before the described compensation, be compensated back signal interference ratio estimated value with described confidence factor.
Beneficial effect of the present invention is: adopt this method, can be in low signal interference ratio compensation signal interference ratio estimated value, make that the signal interference ratio estimated value of received signal is more accurate, and the signal interference ratio estimated result when not influencing high signal interference ratio.
Description of drawings
Mistake in judgment was to the schematic diagram that influences of Interference Estimation when Fig. 1 was QPSK;
Mistake in judgment was to the schematic diagram that influences of Interference Estimation when Fig. 2 was 16QAM;
Fig. 3 is the later distribution of data in planisphere of the channel estimating under the high signal interference ratio condition when being QPSK;
Fig. 4 is the later distribution of data in planisphere of the channel estimating under the high signal interference ratio condition when being 16QAM;
Fig. 5 is the later distribution of data in planisphere of channel estimating under the low signal interference ratio condition during for QPSK;
Fig. 6 is the later distribution of data in planisphere of channel estimating under the low signal interference ratio condition during for 16QAM;
Fig. 7 is a flow chart of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
Basic thought of the present invention is: come the signal interference ratio that estimates is compensated with a confidence factor, be compensated back signal interference ratio estimated value, make the more approaching real signal interference ratio value of compensation back signal interference ratio estimated value, and confidence factor should be able to reflect quality of channel, the degree that signal is disturbed.The present invention comprises the steps: as shown in Figure 7
Steps A: calculate the signal interference ratio results estimated with various estimation method for SIR;
Step B: set a threshold value, calculate the Interference Estimation result and drop in the threshold value zone
The probability of point is as confidence factor;
Step C: come the signal interference ratio estimated result of calculating in the steps A is advanced with this confidence factor
The row compensation, the signal interference ratio estimated value after being compensated.
Among the described step B, the selection of threshold value and setting are rather crucial, and this threshold value can be fixed, also can be along with factor dynamic changes such as channel condition or code modulation modes.The basic principle that threshold value is selected is to make signal interference ratio estimated value and the error minimum between the signal interference ratio value really after the compensation.Signal interference ratio estimated value after can coming to compensate under the more various threshold values by emulation and the error size between the real signal interference ratio value, the threshold value of Select Error minimum is selected as final thresholding.By calculating the probability that the Interference Estimation value drops on the point in the threshold areas, method as confidence factor can have multiple, for example can adopt following method to calculate this value, statistics Interference Estimation value drops on the number of the point within the described threshold value, as representing with M, the number of the point that the Interference Estimation value is total is represented with N, with the next number N divided by total point of the number M of the point within the threshold value, so just can obtain confidence factor P=M/N.Certainly, this confidence factor also can obtain by other similar methods.
Come the signal interference ratio that estimates is compensated with confidence factor, the method of compensation has a variety of, for example establish the linear value of the Interference Estimation result of the signal interference ratio in the steps A for the signal interference ratio estimated value, can adopt following concrete grammar that the signal interference ratio estimated result is compensated among the step C: to compensate such as the linear value that this confidence factor can be multiplied by normal signal interference ratio estimated value, linear value after will compensating then is converted into dB, is compensated back signal interference ratio estimated value; Perhaps this confidence level is carried out a square linear value that multiply by later normal estimated value again, the linear value after will compensating then is converted into dB, is compensated back signal interference ratio estimated value; This confidence factor can also be carried out the linear value that evolution multiply by normal estimated value later on again, the linear value after will compensating then is converted into dB, is compensated back signal interference ratio estimated value.Can also directly multiply by the value that is scaled dB that the preceding signal interference ratio of compensation estimates with this confidence factor, thereby compensate.
As can be seen in high signal interference ratio, nearly all point all will fall in the scope of the threshold value delineation of circle indication in the drawings, so this confidence level compensating factor is about 1, will can not influence the signal interference ratio results estimated from Fig. 3 and Fig. 4.From Fig. 5 Fig. 6 as can be seen when signal interference ratio is low, outside the scope that the threshold value that has the part point to drop on the circle indication is drawn a circle to approve, and, the number of the low more point outside this circle of signal interference ratio will be many more, this offset will be more little, so just can effectively compensate the value of signal interference ratio estimation under the low signal interference ratio.
Below in conjunction with an object lesson method of the present invention is described.If a user's current data amount is a N point, the transmitting power of this N point is all the same, if desired this user's data is carried out signal interference ratio and estimates, uses this method, will carry out according to following operation:
Steps A: calculate this user's signal interference ratio CINR, the meter of signal interference ratio with this N data
The calculation method has a lot, can select a kind of only according to the situation of oneself.
Step B: calculate the number M that the Interference Estimation value drops on the point in the threshold value, calculate confidence level
P＝M/N；
Step C: come the signal interference ratio CINR that calculates among the compensation process A with this confidence level P,
To compensating later accurate more signal interference ratio estimated value CINR '=10*log10 (CINR*P) (dB), perhaps also have other some compensation methodes, such as SNR '=10*log10 (CINR*P
2) (dB) or the like.The CINR here is
The signal interference ratio linear value that calculates in the steps A.
The value of estimating except signal interference ratio can be used this method compensates, and estimated values such as signal to noise ratio estimation also can use this method to compensate.
Should be understood that; concerning the those of ordinary skill in field, the technology of the present invention place; can be equal to accordingly according to technical scheme of the present invention and design thereof and change or replace, and all these changes or replacement, all should belong to the protection range of claims of the present invention.
Claims (7)
1. compensation method that signal interference ratio is estimated said method comprising the steps of:
A, calculate the Interference Estimation result of signal interference ratio with estimation method for SIR;
B, threshold value of setting are calculated the probability that described Interference Estimation result drops on the point in this threshold value, as confidence factor;
C, compensate the signal interference ratio estimated value after being compensated with the Interference Estimation result of described confidence factor to described signal interference ratio.
2. method according to claim 1, it is characterized in that: described confidence factor adopts following method to obtain: statistics Interference Estimation result drops on the number of the point in the described threshold value, drops on the number of the number of the point in the described threshold value divided by the total point of Interference Estimation result with the Interference Estimation result.
3. method according to claim 1 and 2 is characterized in that: the setting of described threshold value should make signal interference ratio estimated value after the compensation and the error minimum between the real signal interference ratio value.
4. method according to claim 3 is characterized in that: the Interference Estimation result of the signal interference ratio in the described steps A is the linear value of signal interference ratio estimated value.
5. method according to claim 4, it is characterized in that: adopt following concrete grammar that the signal interference ratio estimated result is compensated among the described step C: C11, multiply by the linear value of described signal interference ratio estimated value, be compensated the linear value of signal interference ratio estimated value afterwards with described confidence factor; C12, the linear value after the described compensation is converted into the dB value, is compensated back signal interference ratio estimated value.
6. method according to claim 4, it is characterized in that: adopt following concrete grammar that the signal interference ratio estimated result is compensated among the described step C: C21, multiply by the linear value of described signal interference ratio estimated value after described confidence factor carried out square, be compensated the linear value of signal interference ratio estimated value afterwards; C22, the linear value after the described compensation is converted into the dB value, is compensated back signal interference ratio estimated value.
7. method according to claim 4 is characterized in that: adopt following concrete grammar that the signal interference ratio estimated result is compensated among the described step C: C31, the linear value of described signal interference ratio estimated value is converted into the dB value, is compensated preceding signal interference ratio estimated value; C32, multiply by signal interference ratio estimated value before the described compensation, be compensated back signal interference ratio estimated value with described confidence factor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102238710A (en) * | 2010-04-29 | 2011-11-09 | 中兴通讯股份有限公司 | Uplink closed-loop power control method, node B and radio network controller (RNC) |
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| CN1141810C (en) * | 2000-03-11 | 2004-03-10 | 信息产业部电信传输研究所 | Method and device based on inserting frequency pilot sign for evaluating SS/N ratio of communication system |
| CN1159874C (en) * | 2000-10-13 | 2004-07-28 | 中兴通讯股份有限公司 | SIR estimating method and device for WCDMA system |
| US7876810B2 (en) * | 2005-04-07 | 2011-01-25 | Rambus Inc. | Soft weighted interference cancellation for CDMA systems |
| WO2004051902A1 (en) * | 2002-12-02 | 2004-06-17 | Huawei Technologies Co., Ltd. | Unbiased sir estimation for use in power control methods |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102238710A (en) * | 2010-04-29 | 2011-11-09 | 中兴通讯股份有限公司 | Uplink closed-loop power control method, node B and radio network controller (RNC) |
| CN102238710B (en) * | 2010-04-29 | 2016-03-30 | 中兴通讯股份有限公司 | A kind of uplink closed-loop power control method, base station and radio network controller |
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