Patent ID: 7961798
Filing Date: 2011-06-14
Classification: H04L

Abstract:
1. A modulation apparatus of a wired/wireless communication system comprising: an input determinator which determines the polarity of each of a plurality of sub-frames of a bipolar orthogonal frequency division modulation (OFDM) symbol frame, the sub-frames comprising a positive sub-frame and a negative sub-frame; a polarity inverter which inverts the negative sub-frame of the bipolar OFDM symbol frame into a positive sub-frame; a delay buffer which delays one of the positive sub-frame obtained by the polarity inversion unit and the positive sub-flame obtained by the bipolar OFDM symbol frame; a multiplexer which multiplexes the delayed OFDM sub-frame and the undelayed OFDM sub-frame; a digital-to-analog (D/A) converter which converts an OFDM symbol frame obtained through the multiplexing into an analog OFDM symbol frame; and a power amplifier which amplifies the analog OFDM symbol frame.