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An adaptive dual-mode blind equalization method and system

A blind equalization and dual-mode technology, applied in the baseband system, transmission system, digital transmission system, etc., can solve the problems of high computational complexity, slow convergence speed, large steady-state error, etc., and achieve fast convergence speed and fast convergence speed , The effect of small steady-state error

Active Publication Date: 2021-08-31
NAT SPACE SCI CENT CAS
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of slow convergence speed, large steady-state error, and high computational complexity of the blind equalization algorithm, and propose a dual-mode blind equalization method combining switching mode and weighting mode with CMA+DDLMS

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  • An adaptive dual-mode blind equalization method and system
  • An adaptive dual-mode blind equalization method and system
  • An adaptive dual-mode blind equalization method and system

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Embodiment Construction

[0085] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0086] In order to further improve the problems of slow convergence speed, large steady-state error, and high computational complexity of the blind equalization algorithm, the present invention proposes a dual-mode blind equalization method combining switching mode and weighting mode with CMA+DDLMS. Firstly, the performance simulation of three blind equalization algorithms, CMA, MCMA, and DDLMS, is carried out, and the advantages and disadvantages of the three blind equalization algorithms are analyzed, and two blind equalization algorithms, CMA and DDLMS, are selected. Then, combining the advantages and disadvantages of the switching dual-mode blind equalization algorithm and the weighted dual-mode blind equalization algorithm, the CMA+DDLMS dual-mode blind equalization algorithm combined with switching and weighting modes is simulated. Fin...

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Abstract

The invention discloses an adaptive dual-mode blind equalization method and system, the method comprising: calculating the first error signal by using the DDLMS algorithm for the received signal at the receiving end; judging and selecting the DDLMS mode, CMA+DDLMS mode according to the first error signal The weighted dual mode or CMA mode calculates the second error signal; uses the second error signal to update the tap coefficient; uses the updated tap coefficient to perform equalization calculation on the received signal, and performs judgment and error calculation according to the equalized data. The method of the invention has faster convergence speed, smaller residual error, and smaller bit error rate under different signal-to-noise ratios.

Description

technical field [0001] The invention relates to the technical field of channel equalization, in particular to an adaptive dual-mode blind equalization method and system. Background technique [0002] In satellite communication systems, factors such as limited transmission bandwidth, multipath effects, and additive noise will cause serious intersymbol interference in received symbols, seriously affecting communication quality, and reducing communication reliability and stability. At present, channel equalization technology is an effective way to solve this problem, and has broad application prospects in military and civilian fields. Since the transmission characteristics of wireless communication channels are often time-varying, the equalizer must track the channel changes in real time when processing received signals, so as to eliminate intersymbol interference and compensate for distorted signals. In order to achieve this goal, an adaptive equalization technique with adjus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03
CPCH04L25/0238H04L25/025H04L25/03885
Inventor 胡婉如王竹刚梅如如陈轩
Owner NAT SPACE SCI CENT CAS
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