Patent ID: 7848405

Claim:
An equalizer for performing an equalization process for a received signal constructed with a frame including a known symbol part in which the known symbol part is provided in a position other than both ends of the frame, the equalizer comprising: an equalization filter unit for acquiring a signal of an equalization process result by performing an equalization filter process based on a signal serving as an equalization process target and a tap gain coefficient; an update unit for updating the tap gain coefficient used by the equalization filter unit by using a predefined algorithm; a first transmission unit for transmitting a received signal posterior to the known symbol part included in the frame constructing the received signal to a first memory in a forward direction; a second transmission unit for transmitting a received signal prior to the known symbol part included in the frame constructing the received signal to a second memory in reverse order; a first control unit for performing a forward equalization filter process with the equalization filter unit by receiving content of the first memory and employing a total or part of the known symbol part included in the content as the equalization process target; and a second control unit for performing a backward equalization filter process with the equalization filter unit by receiving content of the second memory and employing a total or part of the known symbol part included in the content as the equalization process target, wherein a length of the known symbol part serving as the equalization process target is set to be identical in the forward equalization filter process and the backward equalization filter process, wherein the first memory and the second memory are differently provided, and wherein the forward equalization filter process and the backward equalization filter process are performed by a common control unit.