Signal-to-noise ratio weighting based OFDM system non-linear demapping method

A technology of signal-to-noise ratio and demapping, applied in baseband systems, baseband system components, transmission systems, etc., can solve the problems of low data reliability, low data reliability, and platform effect in packet error rate.

Inactive Publication Date: 2016-06-29
中科威发半导体(苏州)有限公司
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Problems solved by technology

Usually, the receiving end weights the soft decision information according to the strength of the channel coefficient of the carrier. However, the credibility weight based on the strength of the channel coefficient is a relative weight and has nothing to do with the overall

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  • Signal-to-noise ratio weighting based OFDM system non-linear demapping method
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  • Signal-to-noise ratio weighting based OFDM system non-linear demapping method

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Embodiment Construction

[0103] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0104] A kind of OFDM system non-linear demapping method based on signal-to-noise ratio weighting for obtaining the soft decision information required for decoding the received data signal of the OFDM system is: according to the channel coefficient of each subcarrier in the received data signal and the signal Calculate the absolute SNR of each subcarrier based on the overall SNR; calculate the non-linear demapping curve of each subcarrier weighted by the SNR based on the absolute SNR and the reference SNR of the signal; The channel equalization data of each subcarrier in the symbol is mapped through the nonlinear demapping curve weighted by the SNR to obtain the SNR weighted quantization value, and the SNR weighted quantization value after signal equalization is obtained, and then mapped to obtain the soft decision information.

[0105] The str...

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Abstract

The present invention relates to a signal-to-noise ration weighting based OFDM system non-linear demapping method, which is used for obtaining soft decision information required for decoding a receiving data signal of an OFDM system. The method comprises: according to a channel coefficient of each sub-carrier in the receiving data signal and an overall signal-to-noise ratio of the signal, calculating an absolute signal-to-noise ratio of each sub-carrier; based on the absolute signal-to-noise ratio and a reference signal-to-noise ratio of the signal, calculating a non-linear demapping curve of each sub-carrier; and mapping channel equalizing data of each sub-carrier in each symbol of the receiving data signal via the non-linear demapping curve subjected to signal-to-noise ratio weighting so as to obtain a signal-to-noise ratio weighting quantified value, and obtaining soft decision information by mapping the signal-to-noise weighting quantified value. With adoption of the signal-to-noise ratio weighting based OFDM system non-linear demapping method provided by the present invention, more precise and more reliable soft decision information can be obtained, and the information is used for improving decoding performance of receivers, especially receiver performance under deep fading channels.

Description

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Claims

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Application Information

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Owner 中科威发半导体(苏州)有限公司
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