Being manner in order to execute the training phase of adaptive channel anabolism with manner and device null digital communication

摘要

(57) The [Abstract] The present invention, in a system configuration including the band-stop filter forming a clear zone of at least one signal spectrum, both the transmitter or receiver or the transmitter and receiver, the CAP or QAM method and apparatus for performing the training phase of adaptive channel equalization in digital communication path of the modulated signal passes. In this method, training of the adaptive equalizer is performed by a sparse symbol constellation, and number sign condition of (S) is smaller than the number of symbols conformation to be used in data transmission normal. The advantage of the sparse symbol constellation is that it can be reduced to such low levels can be the signal power, is used to reach a state where there is a linear equalizer, a large intersymbol interference due to band-stop filter for the signal spectrum is. In this case, the proportion of correct sign recovery decision, become large enough to train a decision feedback equalizer.