Signal processing method and signal processing device

Abstract

The invention discloses a signal processing method. The method comprises the following steps: carrying out equalization processing on a to-be-processed signal through a first forward feedback equalizer FFE to obtain a first signal; determining a second signal through a judgment rule according to the first signal and the preset signal, the preset signal being used for providing a judgment standard,the judgment rule indicating a judgment relationship between the first signal and the preset signal, and the judgment rule being used for judging the first signal as a target level or position information according to the preset signal; performing equalization processing on the second signal through a nonlinear model or through a second forward feedback equalizer to obtain a third signal; and obtaining an output signal according to the first signal and the third signal. According to the method, the interference of the signal is processed in two parts, the residual ISI or nonlinear interference can be eliminated in a mode of matching hard decision with the FFE or nonlinear model, the interference elimination performance of the system can be basically stable by using less resource cost, andthe purpose that less resources have the maximum performance is achieved.

Description

technical field [0001] The present application relates to the field of communication technologies, and in particular to a signal processing method and a signal processing device. Background technique [0002] In the process of signal transmission, problems such as internsymbol interference (ISI) or nonlinearity of the signal are caused by the limitation of limited channel bandwidth, multipath effect, or the influence of fiber dispersion in transmission. The reason for the formation of ISI is that at a certain sampling moment, because the amplitude value of the waveform of the adjacent symbol is not 0 at this point, it causes interference to the sampling of the current symbol. That is to say, the sampling value obtained at the sampling point not only includes the amplitude value of the current symbol, but also includes the amplitude value of the adjacent symbols. [0003] The most commonly used means of compensating for ISI is feed forward equalization (FFE). It can also be ...

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Problems solved by technology

[0004] If the ISI of the signal is larger, the system response will be less smooth, and the memory length of the signal will be larger. To eliminate ISI, FFE or DFE requires more taps, but taps are proportional to the resources consumed. , the more the number of taps, the greater the resource consumption. Although increasing the tap can improve the performance, the resource cost also increases accordingly.

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