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Noise estimation method and device

A noise estimation and noise technology, which is applied in the field of noise estimation in receivers, can solve the problem of large influence of phase error

Inactive Publication Date: 2014-11-19
SHANGHAI NUFRONT ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SNR estimation is highly affected by phase error

Method used

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  • Noise estimation method and device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0063] An embodiment of the present invention provides a noise estimation method, such as image 3 shown, including steps:

[0064] Step S401: performing delay processing on the signal to be detected;

[0065] Step S402: performing a differential operation on the signal and its delayed signal to obtain noise;

[0066] Step S403: Calculate the noise power.

[0067] Wherein, the signal to be detected includes signal and noise. When there is a delay mismatch, the signal is phase-rotated in the frequency domain, with real and imaginary components. In the first embodiment of the present invention, the influence of phase error on noise estimation is considered, and the signal to be detected is delayed as a whole, and then differential operation is performed with the original signal, thereby subtly eliminating signal interference to noise estimation and making noise estimation more accurate.

[0068] Preferably, when step S401 is executed, the delay processing duration is N times...

no. 2 example

[0078] An embodiment of the present invention provides a noise estimation method, such as Figure 6 shown, including steps:

[0079] Step S701: performing demultiplexing on the signal to be detected, and separating the real or imaginary part of the signal;

[0080] Step S702: performing delay processing on the real or imaginary part of the signal;

[0081] Step S703: performing a differential operation on the real or imaginary part of the signal and the delayed signal to obtain the real or imaginary part of the noise;

[0082] Step S704: Calculate the noise power.

[0083] Wherein, the signal to be detected includes signal and noise. When there is a delay mismatch, the signal is phase-rotated in the frequency domain, with real and imaginary components. In the second embodiment of the present invention, the influence of the phase error on the pilot symbols is considered, and the imaginary part of the signal to be detected is separated out for the influence of the imaginary ...

no. 3 example

[0095] The embodiment of the present invention also provides a device for noise estimation, including sequentially connected:

[0096] A delay processing module, configured to perform delay processing on the signal to be detected;

[0097] The first operation module is used to perform differential operation on the signal and its delayed signal to obtain noise;

[0098] The second computing module is used to calculate the power of the noise.

[0099] Preferably, the delay processing duration is N times the signal period of the signal to be detected; N is a positive integer.

[0100] Preferably, the second operation module is used to calculate the power of the noise by taking a modulus of the noise and performing a square operation, and then multiplying it by a weighting factor; the weighting factor is determined according to the statistical distribution of the noise.

[0101] Preferably, the weighting factor takes a value of 0.5.

[0102] Preferably, it further includes: a f...

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Abstract

The invention provides a noise estimation method and device. The method includes that a to-be-detected signal is subjected to delaying, the original signal and the corresponding delaying signal are subjected to difference operation to get a noise value, and the power of noise is calculated. The invention considers the influence of phase error on noise estimation; after to-be-detected signal is subjected to delaying, and the original signal and the corresponding delaying signal are subjected to difference operation, the interference of the signal to noise estimation is ingeniously eliminated, and noise estimation is more accurate.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for estimating noise in a receiver. Background technique [0002] In modern communication systems (such as WCDMA), the receiver usually estimates the quality of the received signal and feeds it back to the transmitter to adjust the rate of transmitted data to achieve an optimal data rate. In addition, the estimated received signal quality can also be used for combining retransmitted signals to improve receiver performance. The signal-to-noise ratio (SNR for short) of a received signal is a main index for evaluating the quality of a received signal. Therefore, robust SNR estimation is critical for communication systems. [0003] In a communication system, there is usually a pilot channel, such as a CPICH channel in WCDMA. The pilot channel transmits the data content that both the transmitter and the receiver know, which is convenient for calculating the pilot signal power and...

Claims

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Application Information

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IPC IPC(8): H04B17/00H04B1/7097
Inventor 鲍东山司宏伟刘飞肖伟
Owner SHANGHAI NUFRONT ELECTRONICS TECH