Channel blind equalization method based on fractional order multimode

A blind equalization, fractional-order technology, applied in the field of fractional-order multi-mode channel blind equalization, can solve problems such as equalization performance degradation, and achieve the effects of suppressing outliers, low residual intersymbol interference and bit error rate, and low channel equalization

Active Publication Date: 2022-03-11
XIDIAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a blind channel equalization method based on fractional multi-mode in order to solve the above-mentioned shortcomings of the prior art, aiming to solve the problem that the prior art needs an additional carrier recovery loop to compensate the phase error, and the strong impulse noise Problems with degraded equalization performance under conditions
Since the present invention constructs a multi-m

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  • Channel blind equalization method based on fractional order multimode
  • Channel blind equalization method based on fractional order multimode
  • Channel blind equalization method based on fractional order multimode

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] refer to figure 1, to further describe the specific steps for realizing the present invention.

[0037] Step 1, obtain the constant of the signal to be equalized and the signal at the sending end.

[0038] In an embodiment of the present invention, the baseband 16QAM signal received by the antenna of the receiving end is convolved with the impulse response of the transmission channel, and then an impulse noise subject to alpha stable distribution is superimposed to obtain the signal to be equalized, wherein the impulse response of the transmission channel is:

[0039] h=[0.30+j0.25, 0.15+j0.15, 0.10+j0.08, 0.08+j0.06, 0.04+j0.07] T

[0040] According to the following formula, calculate the signal constant of the received signal at the sending end:

[0041]

[0042]

[0043] Among them, R r with R i Respectively represent the constants...

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Abstract

The invention provides a channel blind equalization method based on fractional order multimode, which constructs a multimode cost function based on fractional low moment by utilizing statistical information of an equalizer output signal and a transmitting end signal, so that phase errors in channel equalization do not need to be compensated by an additional carrier recovery loop; and the weighted vector of the equalizer is updated by using the fractional derivative of the multi-mode cost function, so that the abnormal value in the strong pulse noise is inhibited. Compared with the prior art, the method not only can complete channel equalization and carrier phase recovery at the same time, but also has lower residual intersymbol interference and bit error rate in a strong pulse noise environment.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a blind channel equalization method of fractional-order multi-mode under compound additive impulse noise in the technical field of wireless communication. The invention can be used to compensate and correct the wireless channel in the wireless channel under the influence of the additive impulse noise. Background technique [0002] In the communication system, the ISI (Intersymbol interference) introduced by the dispersive channel seriously affects the communication quality. As one of the methods to combat ISI, blind equalization has attracted extensive attention from scholars and engineers because it does not require prior knowledge of data and channels before training. Especially for non-cooperative communication, blind equalization is an indispensable step. In the wireless channel compensation and correction method, the traditional constant modulus algorithm CMA (...

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Application Information

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IPC IPC(8): H04L25/03
CPCH04L25/03089
Inventor 罗勇江李超凡何茂林杨家利闫苏苏张飞
Owner XIDIAN UNIV
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