Adaptive equalization method and adaptive equalizer

Abstract

The present invention relates to the technical field of network communications. Disclosed is an adaptive equalization method comprising: obtaining a first filter signal according to a first filter coefficient; deciding the first filter signal based on an original constellation diagram to obtain a first decision signal; deciding the first filter signal based on an n-l level constellation diagram to obtain an n-l level pseudo decision signal; comparing the n-l level pseudo decision signal with the first filter signal to obtain an n-l level error signal; if the average energy of the n-l level error signal is less than an n-l level threshold, switch the n-1 level constellation diagram to an n level constellation diagram; obtaining an update quantity of the filter coefficient according to the n-1 level error signal and a cache signal, and obtaining a second filter coefficient according to the update quantity; obtaining a second filter signal according to the second filter coefficient; and deciding the second filter signal based on the original constellation diagram to obtain a second decision signal. Also disclosed is an adaptive equalizer.

Description

technical field [0001] The invention relates to network communication technology, in particular to an adaptive equalization method and an adaptive equalizer. Background technique [0002] In a wireless communication system, due to the existence of multipath components in the transmission channel and the nonlinear characteristics of devices, the transmission signals in the system often have intersymbol interference. Adaptive equalization technology can compensate and track the distortion of the transmission system and eliminate the intersymbol interference of the transmission signal, so it is widely used in wireless communication systems. [0003] The performance of adaptive equalizer is mainly evaluated by convergence speed, convergence error and blind equalization convergence characteristics. In environments such as burst communication and high-speed communication, adaptive equalizers are required to have higher performance. [0004] In the prior art, the convergence spee...

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Problems solved by technology

[0005] Embodiments of the present invention provide an adaptive equalization method and an adaptive equalizer, which solve the problem that the adjustment of the convergence speed and the convergence error are mutually restricted in the prior art, and the convergence ability of blind equalization cannot be improved.

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