Signal-to-noise ratio estimation device, system and method based on star map measurement

A technology of signal-to-noise ratio estimation and constellation diagram, applied in the field of signal-to-noise ratio estimation, can solve the problem of high computational complexity, achieve good estimation performance, reduce computational complexity, and reduce the effect of implementation complexity

Inactive Publication Date: 2008-12-03
VIMICRO CORP
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Problems solved by technology

In the traditional SNR estimation method based on constellation diagram measurement, in order to obtain the reference signal, it is necessary to estimate the channel response of each symbol before constellation diagram measurement, and perform corresponding noise addition processing, so the calculation Complexity is still high

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  • Signal-to-noise ratio estimation device, system and method based on star map measurement
  • Signal-to-noise ratio estimation device, system and method based on star map measurement
  • Signal-to-noise ratio estimation device, system and method based on star map measurement

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Embodiment Construction

[0048] The present invention improves the signal-to-noise ratio estimator based on constellation diagram measurement, and proposes a relatively simple calculation and realization of the signal-to-noise ratio estimator and method. The signal-to-noise ratio estimator includes a constellation diagram demodulator, A constellation diagram measurer and a signal-to-noise ratio estimator; wherein, the constellation demodulator input is from the channel compensator to compensate the received data signal to obtain a compensated signal y n , and for the y n Perform demodulation to obtain an estimate of the transmitted signal output to the constellation measurer; the input y of the constellation measurer n and Measure and compare its Euclidean distance output to the SNR estimator; the SNR estimator judges that the channel is a Gaussian channel or a flat fading channel according to the channel condition, then according to directly estimate the signal-to-noise ratio; and if it is ju...

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Abstract

The invention provides a signal to noise ratio estimator, system and method that are based on the constellation measurement. The signal to noise ratio estimator includes a constellation demodulator, a constellation measuring device and a signal to noise ratio estimator; wherein, the constellation demodulator demodulates the signal yn that is compensated by a channel compensator, and obtains the estimated value sn of the sending signal to be output to the constellation measuring device; the constellation measuring device carries out constellation measurement on the input signal yn and sn, works out the European distance |yn-sn| between yn and sn to be output to the signal to noise ratio estimator; the signal to noise ratio estimator judges if the channel is a Gaussian channel or flat fading channel according to the input channel information, and the signal to noise ratio of the Gaussian channel or flat fading channel can be estimated directly according to the |yn-sn|; if the channel is found to be a rapid fading channel, the signal to noise ratio of the rapid fading channel can be estimated according to the estimated channel response Hn and the input |yn-sn|. The invention also proposes the corresponding system and method, which decreases the complexity and has good estimation performance.

Description

technical field [0001] The invention relates to the signal-to-noise ratio estimation technology of digital communication and digital multimedia broadcasting receiving systems, in particular to a signal-to-noise ratio estimator, system and method based on constellation diagram measurement. Background technique [0002] In a communication system, in order to evaluate or optimize the performance of each module of the receiving system, it is usually necessary to know the ratio of the signal power to the noise power in the received symbol, that is, the signal-to-noise ratio. In many applications, due to the requirements of the system or the influence of the channel, the signal-to-noise ratio of the received symbols is often not constant, so a certain method needs to be used to estimate the changing signal-to-noise ratio. [0003] Generally speaking, the goal of the SNR estimation method is to estimate the SNR as accurately as possible with the minimum cost. At present, the commo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04Q7/34H04B17/336
Inventor 黄晓
Owner VIMICRO CORP
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