Blind equalization method and blind equalization system

Abstract

The invention provides a blind equalization method and a blind equalization system. A blind equalization device outputs a blind equalization output signal to a judgment module; an error signal is calculated by the blind equalization output signal, an externally input first error correcting signal and an externally input second error collecting signal, a blind equalization regulation factor is calculated according to an externally input step, the error signal and a receiving signal, a blind equalization factor is updated by utilizing the blind equalization regulation factor according to a received enable signal output by the judgment module, and the receiving signal is filtered and the blind equalization output signal is regulated by using the updated blind equalization factor; and the judgment module calculates an output error signal according to the blind equalization output signal and a judgment output signal, judges whether the output error signal exceeds a preset value or not according to the output error signal and outputs the enable signal for updating the blind equalization factor to the blind equalization device if the output error signal exceeds the preset value. The system and the method of the invention can reduce remainder error and calculated amount and improve convergence rate.

Description

technical field [0001] The invention relates to digital wireless communication technology, in particular to a blind equalization method and a blind equalization system. Background technique [0002] In frequency selective channels, intersymbol interference due to multipath and noise can distort the transmitted signal, causing bit errors in the receiver. Intersymbol interference is considered to be the main obstacle when transmitting high-speed data. To overcome intersymbol interference, equalization techniques are commonly used in receivers. The traditional equalization technology needs to send the training sequence known to the receiver to train the equalizer in the receiver before starting the communication; if the channel is time-varying and in some cases the sending end cannot send the training sequence to the receiver, the receiver needs to The equalization technology that does not depend on the training sequence—blind equalization technology is used to overcome inter-...

AI Technical Summary

Problems solved by technology

according to figure 2 , image 3 And the update formula of the blind equalization weight vector, it can be seen that although the blind equalization device based on the constant modulus has relatively reliable convergence performance, its residual error is relatively large, and a large number of calculations are required to update the blind equalization weight vector, which affects the system efficiency

[0005] In summary, although the existing blind equalization device based on constant modulus has relatively reliable convergence performance, its residual error is relatively large, requiring a large number of calculations, which affects the working efficiency and convergence speed of the system; The phase recovery module in some blind equalization systems can only reduce the residual phase error, but still cannot reduce the residual error

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