TRANSMISSION APPARATUS AND METHOD OF SIGNAL-POINT GENERATION

摘要

A modem for a radio device, which compensates for characteristics on the radio device to increase data transmission speed without changing device specifications. A deemphasis filter for compensating for the characteristics of a preemphasis filter in a radio transmitter is provided in the modem on the transmitting side, while an emphasis filter for compensating for the characteristics of the deemphasis filter in the radio receiver is provided in the modem on the receiving side. This compensates for the characteristics of the radio devices. A redundant signal point is added outside the signal constellation when the signal points of input data are selected, so that in-phase components preceding and following the signal point can be emphasized.