Signal to noise ratio estimation method for Sounding signal

A signal-to-noise ratio estimation and signal technology, which is applied in the field of signal-to-noise ratio estimation, can solve problems such as not meeting system requirements and not fully applicable to Sounding signal performance, and achieve the effect of reducing impact and accurate signal-to-noise ratio estimation

Inactive Publication Date: 2013-12-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] However, at present, most of the researchers' research on SNR is under the OFDM system, while the LTE uplink uses the SC-FDMA multiple access method. There are certain differences between the two, and some can achieve good performance under the OFDM system. The signal-to-noise ratio estimation algorithm is not fully suitable for Sounding signals or the performance cannot meet the system requirements

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  • Signal to noise ratio estimation method for Sounding signal
  • Signal to noise ratio estimation method for Sounding signal
  • Signal to noise ratio estimation method for Sounding signal

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[0025] The present invention provides a kind of signal-to-noise ratio estimation algorithm of Sounding signal, and specific procedure is as follows figure 1 mentioned.

[0026] S1. Suppose the system model is Y k =X k ·H k +W k (k=0,1,...,N s -1), where X k Indicates the transmitted signal on the kth subcarrier, W k Indicates that the mean is 0 and the variance is σ 2 Gaussian white noise, H k is the frequency response of the channel, for Y k Doing the least squares estimation (LS), the estimated value of the channel coefficient is obtained as:

[0027] h LS (k)=Y(k)X * (k)

[0028] =H(k)+V(k) k=0,1,...,N s -1, where X * (k) represents the conjugate of X(k), V(k) represents the noise component, N s is the sequence length of SRS;

[0029] S2, to Y k Do IFFT transformation to get the impulse response in the time domain:

[0030] h LS (l)=IFFT{H LS (k)}=h(l)+v(l), l=0,1,...,N s -1, where H LS (*) is the frequency domain channel response obtained from the abo...

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Abstract

The invention relates to the signal to noise ratio estimation technology, in particular to a signal to noise ratio estimation method for detection reference signals. The signal to noise ratio estimation method for the Sounding signal comprises the steps that time domain impact response of a channel is calculated; a noise estimation interval is determined; windowing operation is conducted; an average signal to noise ratio is calculated. The signal to noise ratio estimation method for the Sounding signal can effectively lower the influence on noise estimation by leakage of the Sounding signal, and accurate signal to noise ratio estimation is obtained.

Description

technical field [0001] The invention relates to a signal-to-noise ratio estimation technique, in particular to a method for estimating the signal-to-noise ratio of a sounding reference signal. Background technique [0002] In a Long Term Evolution (LTE) system, a Sounding Reference Signal (Sounding Reference Signal, SRS) is defined in an uplink, and is used for operations such as channel quality detection, frequency domain scheduling, and power control. The range covered by SRS is usually larger than the current data transmission bandwidth, so that the channel quality information in the entire channel bandwidth can be obtained, and then the frequency band with good channel quality is selected as the channel frequency band for data transmission in the next time slot. [0003] People usually use signal-to-noise ratio (SNR) as an important parameter to measure channel quality. At present, the SNR estimation methods proposed by researchers can be mainly divided into two categor...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02
Inventor 田浩杨霖李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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