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Signal-to-noise ratio estimation method based on detection reference signal

A technology for detecting reference signals and SNR estimation, which is applied in the field of SNR estimation, can solve the problems of performance degradation, affecting estimation accuracy, and the SNR estimation method cannot be directly applied to SRS, etc., to achieve accurate subcarrier SNR estimation , the effect of reducing the impact

Inactive Publication Date: 2013-11-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

At present, the estimation methods based on the pilot frequency mainly include the Maximum Likelihood (ML) algorithm, the Minimum Mean Square Error (MMSE) algorithm, and the Boumard algorithm, etc., but these methods are mostly based on block pilots. However, SRS forms a "comb" distribution in the frequency domain, and since SRS uses SC-FDMA transmission scheme, some traditional SNR estimation methods cannot be directly applied to SRS
On the other hand, traditional methods (such as the Boumard algorithm) usually experience a significant drop in performance at high SNRs, affecting estimation accuracy

Method used

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  • Signal-to-noise ratio estimation method based on detection reference signal
  • Signal-to-noise ratio estimation method based on detection reference signal
  • Signal-to-noise ratio estimation method based on detection reference signal

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specific Embodiment approach

[0023] The SRS sequence is inserted into subcarriers at intervals in the frequency domain, forming a "comb" structure in the frequency domain, such as figure 2 shown.

[0024] Such as figure 1 As shown, the steps of this method are as follows:

[0025] S1. Generate an SRS sequence in the frequency domain, and map the SRS sequence to a resource element (RE) according to the mode in the LTE protocol. The mapping rules are as follows: a 2 k + k 0 , l = β SRS r SRS ( k ) k = 0,1 ...

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Abstract

The invention relates to the technology of signal-to-noise ratio estimation, and particularly relates to a signal-to-noise ratio estimation method based on detection reference signal. The signal-to-noise ratio estimation method comprises the following steps: generating a SRS (Sounding Reference Signal) sequence on a frequency domain, and mapping the SRS sequence on a Resource Element (RE) according to mapping manner in LTE (Long Term Evolution) protocol; specifically calculating noise estimation; calculating average signal-to-noise ratio of signal; calculating signal-to-noise ratio of subcarrier. The method disclosed by the invention can be directly applied to SRS, the influence of signal on noise power estimation is reduced by utilizing non-load carrier technology, and the noise power is effectively estimated, so that accurate average signal-to-noise ratio estimation and subcarrier signal-to-noise ratio estimation are 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] As a development direction of the new generation of mobile communications, Long Term Evolution (LTE) is currently attracting people's attention. In the downlink direction, the LTE system adopts Orthogonal Frequency Division Multiple Access (OFDMA) as its multiple access mode. In the uplink, in order to reduce the peak-to-average power ratio of the transmitting terminal, reduce the size and cost of the terminal, the 3GPP organization decided to adopt the single-carrier frequency division multiple access (Single-Carrier Frequency Division Multiple Access, SC-FDMA) method to transmit information. [0003] Two kinds of reference signals are defined in the uplink direction of LTE (Long Term Evolution): Demodulation Reference Signal (Demodulation Reference Sig...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/24H04W24/00
CPCY02B60/50
Inventor 田浩杨霖李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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