PURPOSE: To obtain a low cost and high speed decision feedback equalizer by providing data holding means which are the same number as the number of the value that a decision result is possible to take and a selection means defining the decision result as a control signal.
CONSTITUTION: The outputs 7 of a decision means 6 are inputted in a feedback signal candidate generation means 8 and a selection means 14. The selection means 14 defines the outputs of the decision means 6 as selection control signals, selects either one of the feedback signals 13a and 13b held in data holding means 15a and 15b by depending on whether the selection control signals are '0' or '1', and outputs the signal as a feedback signal 9 to a subtraction means 4. The generation means 8 repeats an operation that the signal 13a when the next decision result is '0' and the signal 13b when the next decision result is '1' are generated, when the decision result is obtained. Therefore, by composing the data holding means 15a and 15b and the selection means 14 by high speed elements, the operations can be made at high speed and the speed-up becomes possible at low cost.
SAWAGUCHI HIDEKI
SATO NAOKI
UMEMOTO MASUO
