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Planisphere mapping based signal-noise ratio estimation method and apparatus in multi-carrier system

A technology of multi-carrier system and signal-to-noise ratio, which is applied in the field of digital information transmission, can solve problems such as inability to guarantee accuracy, and achieve the effect of simple hardware implementation circuit, less hardware resources, and reduced impact

Inactive Publication Date: 2007-12-05
HAIER BEIJING IC DESIGN
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Problems solved by technology

However, the accuracy of SNR estimation cannot be guaranteed in the presence of harsh channels such as multipath delay and Doppler frequency shift.

Method used

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  • Planisphere mapping based signal-noise ratio estimation method and apparatus in multi-carrier system
  • Planisphere mapping based signal-noise ratio estimation method and apparatus in multi-carrier system
  • Planisphere mapping based signal-noise ratio estimation method and apparatus in multi-carrier system

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Embodiment Construction

[0016] Fig. 1 is a flowchart of a DVB-T receiving system according to an embodiment of the present invention.

[0017] As shown in Figure 1, in the DVB-T receiving system of an embodiment of the present invention, comprise RF down-conversion module 1, time domain synchronization module 2, OFDM demodulation module 3, channel equalization module 4, QAM demapping module 5, A deinterleaving module 6 , a channel decoder 7 , a QAM mapping module 8 , a deviation distance parameter calculation module 9 , and an accumulation processing module 10 .

[0018] The RF down-conversion module 1 of DVB-T down-converts the air signal to obtain an intermediate frequency time domain signal. Then, the time domain synchronization module 2 performs synchronization according to the guard interval characteristics of the OFDM signal to obtain the time domain window opening position. The OFDM demodulation module 3 removes the guard interval from the input time-domain signal, performs FFT operation and ...

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Abstract

The method includes steps: based on data information after channel equalization to carry out QAM mapping so as to obtain ideal position QAM_out of data information on planisphere; calculating first function value YH_QAM and second function value HH of the point on planisphere corresponding to the data information; first function includes factors of channel information, ideal position QAM_out, and data information before channel equalization; second function includes factor of channel information; first function and second function constitute distance of deviation Dist of the point related to the ideal position; accumulating first functions and second functions of corresponding points; using the accumulated first function value and second function value to calculate SNR.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and in particular relates to a signal-to-noise ratio (SNR) estimation method and device based on constellation map mapping in a multi-carrier receiver system. Background technique [0002] In the receiver of the multi-carrier system, it is often necessary to use the received signal to estimate the quality of signal transmission, that is, the signal-to-noise ratio (SNR). Traditional estimation methods are mainly divided into the following two categories: [0003] 1) Estimated by using useless sub-carriers in the multi-carrier spectrum. [0004] In a multi-carrier system such as OFDM, in order to effectively protect the transmission of useful subcarrier information, the transmitting end inserts protection subcarriers on both sides of the useful data spectrum with an amplitude of 0; the receiving end can use these useless subcarriers received Carrier information for SNR es...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 强辉戴书胜
Owner HAIER BEIJING IC DESIGN
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