CN112910582B - Noise and interference power estimation method in multi-sending-end mode - Google Patents
Noise and interference power estimation method in multi-sending-end mode Download PDFInfo
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Abstract
The invention discloses a noise and interference power estimation method under a multi-transmitting-end mode, which comprises the following steps: receiving and extracting a time domain signal; LS channel estimation; calculating a current TO estimated value; channel response combination; calculating interference noise power; and (4) NI estimation judgment. According to the method, the estimation of the noise power is calculated through the difference between the received signal and the reconstructed signal, the compensation of the estimation deviation in the multi-logic-port spatial multiplexing mode and the compensation of the white noise residual power can be realized, and the precision and the accuracy of the noise power estimation are improved.
Description
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a noise and interference power estimation method in a multi-transmitting-end mode.
Background
With the development of mobile communication technology, NR (New Radio) is used as the evolution from 4G to 5G, and provides another communication system with high speed, low delay and massive connection. The noise power is used as an important index for measuring the channel quality, the requirement on the estimation accuracy is higher and higher, and the distribution of the estimation scene is more and more complex. LS (Least mean square Error) channel estimation is widely used in engineering implementation due to its advantage of low complexity, but there is generally a large bias in noise power estimation based on LS channel estimation. The conventional noise and interference power estimation scenario is limited in that the estimation of the noise power lacks compensation for the estimation bias in the multi-logical port spatial multiplexing mode, and the conventional differential estimation method for estimating the noise and interference power based on the LS channel estimation lacks compensation for the white noise residual power.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for estimating noise and interference power in a multi-transmit-port mode, comprising:
s1, receiving and extracting a time domain signal;
s2, Fourier transform is carried out on the time domain signals to transform the time domain signals to frequency domain signals;
s3: LS channel estimation, calculating the channel estimation value;
s4: calculating a current TO estimated value by using the channel estimated value;
s5: channel response combination;
s6: calculating interference noise power;
s7: and (4) NI estimation judgment.
The invention has the beneficial effects that: according to the method, the estimation of the noise power is calculated through the difference between the received signal and the reconstructed signal, the compensation of the estimation deviation in the multi-logic-port spatial multiplexing mode and the compensation of the white noise residual power can be realized, and the precision and the accuracy of the noise power estimation are improved.
Drawings
FIG. 1 is a flow chart of the present invention;
fig. 2 is a diagram of channel response combining.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1, the method for estimating noise and interference power in a multi-transmit-end mode of the present invention includes the following steps:
s1, receiving and extracting a time domain signal;
s2, Fourier transform is carried out on the time domain signals to transform the time domain signals to frequency domain signals;
s3: LS channel estimation, calculating the channel estimation value;
s4: calculating a current TO estimated value by using the channel estimated value;
s5: channel response combination;
s6: calculating interference noise power;
s7: and (4) NI estimation judgment.
Specifically, the S5 includes:
s501: phase compensation;
s502: and combining the channel responses to obtain a second channel estimation value.
Specifically, the S6 includes:
s601: reconstructing a transmission frequency domain signal;
s602: calculating the difference amplitude of the received signal of S2 and the reconstructed signal of S601 at all the carrier frequency points in the window;
s603: calculating a first NI estimated value by calculating the noise and interference power value through the difference amplitude;
s604: correcting the deviation of the NI estimation caused by residual noise and interference in the difference value calculation process; multiplying the first NI estimated value by the compensation factor to obtain a second NI estimated value;
s605: and calculating the current signal-to-noise ratio according to the second NI estimated value and the combined channel response, recording the current signal-to-noise ratio as SINR, and using the SINR in S7NI estimation judgment.
Specifically, the compensation factor calculation is obtained through a static mapping relation table in which the compensation factor calculation is associated with the sliding window length of channel estimation and the number of transmitting antenna ports.
Specifically, the S7 specifically includes:
the NI estimation decision one: if the difference between the currently estimated second NI estimation value and the last second NI estimation value in S604 is greater than a preset first threshold, recording the last NI estimation value as the final estimation value of the current reception process;
and NI estimation decision II: if the difference between the currently estimated second NI estimate value and the last second NI estimate value in S605 is smaller than the second pre-threshold, the SINR value is larger than a third set threshold, and the currently estimated value is recorded as the final estimated value of the current receiving process.
Specifically, if neither the current second NI estimation value in S604 and S605 satisfies the condition, the process returns TO S4, and the TO estimation carrier interval is adjusted according TO the current NI estimation value.
The specific process of the invention is as follows:
s1, extracting the receiving time domain signal according to the frame structure configuration;
s2, performing FFT (Fast Fourier Transform) on the time domain signal of S1, and transforming the time domain signal into a frequency domain signal;
and S3, extracting the reference signal in the frequency domain to carry out channel estimation, wherein the channel estimation is LS channel estimation.
Wherein
Indicating the reference signal transmitted by the nth transmission port, the kth subcarrier,
indicating the received signal of the kth subcarrier of the nth receive antenna. [] T And represents conjugate transpose.
Table LS estimates the frequency domain channel response estimate for the nth transmit port, nth receive antenna;
s4, calculating the current TO (timing offset) estimated value by using the channel estimated value of S3;
s5, channel response combination;
carrying out noise suppression and orthogonal solution in a mode of carrying out sliding window combination on the channel response estimated by S3;
s501, complementing the phase rotation brought by time delay in each combining window to the first carrier in the window before combining as shown in figure 2;
s502, combining, namely averaging the compensated channel responses, and taking an obtained combined value as a second channel estimation value of all carriers in the whole window;
s6, calculating interference noise power: reconstructing the transmission reference signal through the reference signal and the second channel response obtained in the step S5, and estimating the noise power based on the window level; the estimation of the noise power specifically includes:
s601, reconstructing a transmission frequency domain signal through the time domain signal S1 and the second channel response S3;
s602, calculating the difference amplitude between the signal obtained in the S2 and the reconstructed signal in the S601 at all the carrier frequency points in the window;
s603, calculating a first NI (noise and interference) estimated value through the difference amplitude;
s604, correcting the deviation of the NI estimation caused by the residual noise and interference in the difference value calculation process; multiplying the first NI estimated value by a compensation factor in S603 to obtain a second NI estimated value;
the compensation factor calculation is obtained through a static mapping relation table which is correlated with the sliding window length of the channel estimation and the number of the transmitting antenna ports.
S605, calculating the current signal-to-noise ratio and recording as SINR according to the current NI estimation and the combined channel response in S3, and using the current signal-to-noise ratio as the SINR for the NI estimation judgment of S7 and S8;
s7, NI estimation decision one:
performing NI estimation reliability determination according to steps S604 and S605, if the difference between the currently estimated second NI estimation value and the last second NI estimation value of S604 is greater than a first Threshold1, recording the last second NI estimation value as the final estimation value of the current reception processing;
s8, NI estimation judgment two:
performing NI estimation reliability decision according to steps S604 and S605, if the difference between the second NI estimation value currently estimated by S604 and the second NI estimation value last time is smaller than a second Threshold2, and the SINR value in S605 is greater than a third set Threshold, recording the current NI estimation value as the final estimation value of the current receiving process; in the figure, m represents the NI estimation times.
And if the judgment result of the NI estimation first and the judgment result of the NI estimation second do not meet the condition, returning TO the TO estimation processing module S4, and adjusting the carrier interval of the TO estimation according TO the current NI estimation value.
According to the method, the estimation of the noise power is calculated through the difference between the received signal and the reconstructed signal, the compensation of the estimation deviation in the multi-logic-port spatial multiplexing mode and the compensation of the white noise residual power can be realized, and the precision and the accuracy of the noise power estimation are improved.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (4)
1. A method for estimating noise and interference power in a multi-transmit-end mode is characterized by comprising the following steps:
s1, receiving and extracting a time domain signal;
s2, Fourier transform is carried out on the time domain signals to transform the time domain signals to frequency domain signals;
s3: LS channel estimation, calculating the channel estimation value;
s4: calculating a current TO estimated value by using the channel estimated value;
s5: channel response combination; the method comprises the following steps:
s501: phase compensation;
s502: channel responses are combined to obtain a second channel estimation value;
s6: calculating interference noise power; the method comprises the following steps:
s601: reconstructing a transmission frequency domain signal;
s602: calculating the difference amplitude between the signal obtained through S2 and the signal obtained through S601 at all load frequency points in the window;
s603: calculating a first NI estimated value by calculating the noise and interference power value through the difference amplitude;
s604: correcting the deviation of the NI estimation caused by residual noise and interference in the difference value calculation process; multiplying the first NI estimated value by the compensation factor to obtain a second NI estimated value;
s605: calculating the current signal-to-noise ratio according to the second NI estimated value and the combined channel response, recording the current signal-to-noise ratio as SINR, and using the SINR in S7NI estimation judgment;
s7: and (4) NI estimation judgment.
2. The method of claim 1, wherein the compensation factor calculation is obtained from a static mapping table correlating sliding window length of channel estimation and number of transmit antenna ports.
3. The method of claim 1, wherein the S7 specifically comprises:
the NI estimation decision one: if the difference between the currently estimated second NI estimation value and the last second NI estimation value in S604 is greater than a preset first threshold, recording the last NI estimation value as the final estimation value of the current reception process;
and NI estimation decision II: if the difference between the currently estimated second NI estimate value and the last second NI estimate value in S605 is smaller than a second pre-threshold and the SINR value is greater than a third set threshold, recording the currently estimated value as the final estimated value of the current receiving process.
4. The method of claim 1, wherein if neither of the second NI estimate values currently estimated in S604 and S605 satisfies the condition, the method returns TO S4, and adjusts the TO estimated carrier spacing according TO the current NI estimate value.
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| KR20110029652A (en) * | 2009-09-16 | 2011-03-23 | 삼성전자주식회사 | Apparatus and method for estimating channel in broadband wireless communication system |
| KR101643419B1 (en) * | 2009-12-24 | 2016-07-27 | 삼성전자주식회사 | Method and apparatus for estimating a channel using phase compensation in a wireless communication system |
| CN102238111A (en) * | 2010-04-23 | 2011-11-09 | 中兴通讯股份有限公司 | Signal interference detection method and device |
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| CN106487735A (en) * | 2015-09-01 | 2017-03-08 | 中兴通讯股份有限公司 | A kind of frequency deviation estimating method and device |
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| CN102075465A (en) * | 2011-02-14 | 2011-05-25 | 电信科学技术研究院 | Method and equipment for estimating noise power |
| CN104253771A (en) * | 2013-06-27 | 2014-12-31 | 富士通株式会社 | Multi-parameter joint estimation method and apparatus |
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