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Signal to noise ratio (SNR) estimation method of physical uplink control channel (PUCCH) of long term evolution (LTE) system

A signal-to-noise ratio estimation and channel technology, applied in the direction of using the return channel for error prevention/detection, wireless communication, power management, etc., can solve problems such as incomplete response, inaccurate estimation, and low signal-to-noise ratio

Active Publication Date: 2013-11-20
WUHAN POST & TELECOMM RES INST CO LTD
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Problems solved by technology

[0017] PUCCH only occupies 1 PRB in the frequency domain, and each OFDM symbol has only 12 subcarriers. Regardless of the existing method, simply using the pilot to estimate the SNR will inevitably lead to inaccurate estimation due to the small number of samples. Fully reflect the current channel conditions and provide an accurate reference value for uplink power control, so the problem is how to accurately estimate the SNR

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  • Signal to noise ratio (SNR) estimation method of physical uplink control channel (PUCCH) of long term evolution (LTE) system
  • Signal to noise ratio (SNR) estimation method of physical uplink control channel (PUCCH) of long term evolution (LTE) system
  • Signal to noise ratio (SNR) estimation method of physical uplink control channel (PUCCH) of long term evolution (LTE) system

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[0031] The technical solution of the present invention will be described in detail below in conjunction with the drawings and embodiments.

[0032] This paper proposes a method to calculate the signal-to-noise ratio by using the information of all OFDM symbols (pilot symbols and data symbols) based on Fourier transform to separate the signal and noise vectors. The carrier is multiplied by the conjugate of the base sequence to eliminate the influence of the base sequence, and then a DFT transformation is performed to obtain a cyclic shift sequence. If there is a time offset, time offset compensation needs to be done, and finally the corresponding 14-column symbols are taken out (considering the short format ), obtain the cyclic shift value n corresponding to each column symbol of the currently scheduled UE (terminal) according to the protocol cs (1), take out the corresponding signal tap coefficients and noise tap coefficients, respectively calculate the energy corresponding to...

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Abstract

The invention relates to a signal to noise ratio (SNR) estimation method of a physical uplink control channel (PUCCH) of a long term evolution (LTE) system. The method comprises the steps: carrying out base sequence removal on data which is de-mapped; after that, carrying out DFT (Discrete Fourier Transformation) on the data subjected to base sequence removal to separate signal vectors and noise vectors; if the data has time bias, carrying out the DFT after the time bias is compensated; meanwhile, extracting corresponding signal tap coefficient and noise tap coefficient according to the cyclic shift value. When SNR is calculated, the peak power is the sum of signal tap powers of all fourteen orthogonal frequency division multiplexing (OFDM), and the noise is the sum of noise tap powers of all fourteen orthogonal frequency division multiplexing (OFDM) symbols as well. According to the SNR calculated by this way, the sample numbers of signal powers and noise powers are more usually used for the SNR estimation than generally and merely utilizing pilot symbols for the SNR estimation, so that the estimated SNR is closer to the true value.

Description

technical field [0001] The present invention relates to a wireless communication system, and more specifically, to a method for estimating a signal-to-noise ratio of an uplink control channel in a third-generation mobile communication long-term evolution system (hereinafter referred to as 3G LTE). Background technique [0002] LTE (Long Term Evolution, long-term evolution) uplink control channel (PUCCH) signal-to-noise ratio (SNR) estimation is an important function in the LTE system. The signal-to-noise ratio is a measurement index reflecting the channel quality of the current user, and it can be used to judge the validity of uplink received signals and serve as a target SNR reference value for uplink power control. An accurate PUCCH SNR estimation scheme can ensure user effective power adjustment and signal validity judgment at the receiving end, etc. The purpose of SNR estimation of the uplink control channel PUCCH in the LTE system is to reflect the current channel cond...

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Application Information

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IPC IPC(8): H04W52/24H04L1/18
Inventor 宁雁斌江世宇王俊官银莹黄小军陈亮明
Owner WUHAN POST & TELECOMM RES INST CO LTD
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