Blind equalization method and blind equalization device

Abstract

The invention provides a blind equalization method and a blind equalization device. A blind equalization module delays an external input signal to acquire L received signals, and a conjugate signal of the received signals are acquired according to the L received signals; an error signal is calculated according to a blind equalization output signals and an error correction signal output by a filter; the error signal is subjected to nonlinear quantization to form a quantization error signal serving as an enable signal, and a first adjustment subsystem is calculated according to the conjugate signal of the received signals; shifting places is calculated according to relationships and steps of the error signal, a first error signal threshold value and a second error signal threshold value and 0; and the first adjustment subsystem is shifted according to the shifting places; and a second adjustment subsystem updates a blind equalization coefficient, and outputs the updated blind equalization coefficient to the filter. The method and the device can reduce calculation amount, retain a large amount of information of the error signal and improve stability and 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 device. Background technique [0002] In a digital communication system, Intersymbol Interference (ISI) is prone to occur due to the frequency selectivity, distortion and dispersion characteristics of the channel. Currently, equalization techniques are commonly used to overcome ISI. In the traditional equalization technology, before the sending end and the receiving end start communicating, the sending end needs to send the known training sequence of the receiving end to detect the equalizer, which greatly reduces the transmission efficiency. In order to improve the transmission efficiency, a blind equalization technique that does not require training sequence detection is proposed. The blind equalization technique utilizes the specific probability and statistical characteristics of the signal, saves the resources o...

AI Technical Summary

Problems solved by technology

[0005] The existing blind equalization device based on constant modulus actually adopts a serial structure, which shifts and filters the input signal x(k) one by one, and the processing speed is relatively slow; when L is large, the calculation of the filter The delay is very large, which causes the throughput of the blind equalization device to drop, seriously affects the processing rate of the blind equalization device, and even makes the blind equalization device unable to converge; the existing blind equalization module also uses a large number of multipliers, and the blind equalization module is being updated Blind equalization coefficients will also take up more multiplication resources, which will cause most of the work to be wasted on multiplication calculations, seriously affecting the convergence speed and stability of the blind equalization device

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