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
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[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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