PURPOSE: To decide a correct far end signal bv adding a symbol which is 0 to a 2B1Q code, deciding a level 0 by a received symbol decision device, and generating the symbol 0 by a sent symbol generator.
CONSTITUTION: A current decision received symbol is delayed by one cycle to obtain a received symbol decision value which is one cycle precedent and a current residual error which is the difference between the output and input of the received symbol decision device 30 is delayed by one cycle by a delay device 32 to an intermediate value residual error estimation which is one cycle precedent; and a tap coefficient is updated by using an estimated value of a tap coefficient C-1 for precursor equalization. When a precursor h-1 can be set to 0 in arithmetic for an evaluation function of impulse response, the input to the symbol value decision device coincides completely with a current sent code value an.
SATO TAKASHI
TAKATO KENJI
UJIIE HIROYUKI
IKETANI YOZO
