臺灣博碩士論文加值系統

中文摘要 本篇論文主要描述關於 PACS 個人通信系統中調變器與解調
變器的設計與雛形硬體製作。現在已有許多調變與解調變的技術考量用於
TDMA 行動無線系統。在 PACS 中， 所採用的調變方法為 Pi/4-DQPSK。
關於解調變的部份，參考由Justin C. -I. Chuang 與 Nelson R.
Sollenberger 兩位研究員所提出的精闢理論，我們可以設計出一低複雜
度之硬體架構以實作模擬測試，而且在有頻率漂移的情況下能表現其穩定
的特質。除此之外，在處理過相位差後還可以得到一個次佳的取樣點以增
加其效能性。

Abstract The contents of this thesis mainly describes
an experimentalhardware design which emulates prototyping
modulator and demodulatorin the Personal Access Com-munication
Systems (PACS). There are manydifferent modulation and
demodulation techniques which have beenconsidered for TDMA
portable radio systems. In PACS, the Pi/4-DQPSKis used as the
modulating scheme. For the demodulation, based on
anintelligent algorithm proposed by Justin C. -I. Chuang and
Nelson R.Sollenberger, we may implement a low complex ity
hardware structurethat performs robust against frequency offset
between transmitter andreceiver. Besides, a suboptimal
sampling point is also obtained afterprocessing the differential
phase between adjacent symbols.