泛歐式數位行動電話 數位加強型無線電話 同調解調 功率頻譜密度 分時多工 分頻多工 分頻雙工 分時雙工 碼際干擾 鄰頻道干擾 Global system for mobile communications GSM Digital enhanced cordless telecommunications DECT Coherent demodulation Power spectrum density PSD Time division multiple access TDMA Frequency division multiple access FDMA Frequency division duplex FDD Time division duplex TDD Inter symbol interference Adjacent channel interference ACI