Waveform Design in DMT with Offset QAM Modulations

• Main Authors: Kuei-Fang Li, 李桂芳
• Other Authors: Wen-Thong Chang
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/74588158741712281970

碩士 === 國立交通大學 === 電信工程系 === 87 === OFDM (orthogonal frequency division multiplexing) differs from DMT (discrete multitone) by the use of time domain shaping and duration extension to reduce the spectral sidelobes of the orthogonal signal set. Here we optimize the transmit and receiving filters with offset QAM modulation. The filters overlap in both the time and frequency domains. And they can achieve perfect reconstruction without inter-symbol and inter-channel interference. In addition, because we compose the filters by cubic splines with the continuous property, an analog waveform is expectable.