A blind channel adaptive method and device thereof

Abstract

The invention discloses a blind channel self-adaptation method and device. The blind channel self-adaptation method comprises the following steps of estimating phase noise of input signals, estimating amplitude attenuation of the input signals, detecting pulse interference of the input signals, weighing a phase noise estimation value and an amplitude attenuation estimation value to obtain a channel quality estimation value, carrying out threshold comparison to obtain the self-adaptation information of a channel, and by utilizing the channel self-adaptation information, finishing a channel self-adaptation process in a self-adaptation sending mode through a sending end. The blind channel self-adaptation device comprises a phase angle calculation and quantization module, a demapping module, a phase noise estimation module, an amplitude calculation and quantization module, an amplitude attenuation and estimation module, an interference detection module, a weighing module, a channel self-adaptation module and a self-adaptation sending module. Through coefficient-variable weighing processing on phase noise and amplitude attenuation, the blind channel self-adaptation method and device improve the accuracy of channel estimation, are high in applicability, and are high in transmission efficiency. The sending end adjusts the parameters of sending signals in a self-adaptation mode according to the channel quality, and makes full use of the channel resources.

Description

technical field [0001] The present invention relates to the field of digital communication, in particular to a blind channel self-adaptive method and device applicable to a multi-carrier receiving system. Background technique [0002] At present, in general communication systems, the channel environment is relatively harsh. In addition to the signal attenuation gradually increasing with the increase of communication distance, there are also various noise interferences, such as Gaussian noise, impulse noise, etc. In addition, multipath Transmission can have a severe impact on signal reception performance. Therefore, in order to obtain reliable communication in such a complex and changeable channel, a variety of channel anti-interference measures must be taken. Among them, channel adaptation is a technology commonly used in existing communication systems to improve system performance. Channel adaptive technology is based on the estimated value of the current channel quality, ...

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Problems solved by technology

These two methods have their own advantages and disadvantages. The estimation performance of the non-blind estimation method is relatively good, but the transmission efficiency is reduced, and the spectrum utilization rate is low. In today's increasingly tight spectrum resources, it is generally not used in occasions that do not require high estimation performance. this method

The blind estimation method makes full use of the characteristics of the signal itself for estimation, does not require auxiliary data at the transmitter, has high transmission efficiency, and has a broad application space. However, the current algorithm for directly blindly estimating SINR has high complexity, is difficult to implement, and is not practically applicable. Performance can also be improved

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