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Signal-to-Noise Ratio Estimation Method and Device for Orthogonal Frequency Division Multiplexing System

A technology of signal-to-noise ratio estimation and orthogonal frequency division, which is applied in the field of signal-to-noise ratio estimation of OFDM systems, can solve the problem of low precision and achieve the effect of improving precision, increasing the number of subcarriers, and insensitivity to channel conditions

Inactive Publication Date: 2011-12-21
ZTE CORP
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Problems solved by technology

However, due to the limitation of the accuracy of LS channel estimation and the small number of pilots available in one OFDM symbol, this method of SNR estimation is not very accurate

Method used

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  • Signal-to-Noise Ratio Estimation Method and Device for Orthogonal Frequency Division Multiplexing System
  • Signal-to-Noise Ratio Estimation Method and Device for Orthogonal Frequency Division Multiplexing System
  • Signal-to-Noise Ratio Estimation Method and Device for Orthogonal Frequency Division Multiplexing System

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Embodiment Construction

[0043] The invention provides a method and device for estimating the signal-to-noise ratio of an OFDM system, which uses synchronous symbols in a frame structure to estimate the signal-to-noise ratio, and can effectively improve the estimation accuracy of the signal-to-noise ratio of an OFDM system terminal received signal.

[0044] Figure 4 It is a flow chart of the first embodiment of the OFDM system signal-to-noise ratio estimation method of the present invention. This embodiment takes the CMMB system as an example to illustrate the OFDM system signal-to-noise ratio estimation method of the present invention. The signal-to-noise ratio estimation method of the present embodiment includes:

[0045] Step S401: Extract and store time-domain data of a synchronization symbol according to system timing. Specifically, it can be seen from the frame structure defined by the CMMB that there are 2048 pieces of time-domain data of one synchronization symbol extracted according to the ...

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Abstract

The invention discloses a method for estimating the signal-to-noise ratio of an OFDM system, which includes: extracting and storing time-domain data of a synchronous symbol according to system timing; performing fast Fourier transform on the time-domain data of the synchronous symbol to convert it to Transforming into frequency domain synchronization symbols; performing channel estimation on the frequency domain synchronization symbols; performing inverse fast Fourier transform on the channel estimation value of the frequency domain synchronization symbols to obtain a time domain channel impulse response; according to the time domain Statistical noise power and total power of the channel impulse response; and calculating the signal-to-noise ratio of the output signal according to the noise power and the total power. The invention also provides an OFDM system signal-to-noise ratio estimation device. The method and device for estimating the signal-to-noise ratio of the present invention use synchronous symbols in the frame structure of the OFDM system to estimate the signal-to-noise ratio, which can effectively improve the accuracy of estimating the signal-to-noise ratio of signals received by terminals in the OFDM system.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a signal-to-noise ratio estimation method and device for an OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system. Background technique [0002] Mobile TV is a service of watching TV with a mobile phone with a video support function. With the improvement of the quality of life, more and more users start to use this service. In my country, CMMB (China Mobile Multimedia Broadcasting, China Mobile Multimedia Broadcasting) proposed by the State Administration of Radio, Film and Television has been promulgated as the industry standard in October 2006. It adopts a technical system that combines S-band high-power satellites with ground co-frequency supplementary networks, combines one-way broadcasting and two-way interaction, and realizes integrated coverage of space and ground throughout the country and roaming throughout the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 曹南山张涛陈力邱宁
Owner ZTE CORP
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