在本篇論文中，我們使用相差空時調變，探討了多天線的雙向中繼網路的設計，對於兩終端節點的星座圖設計我們提出數個架構，各架構對於資料率和錯誤率上有不同的取捨，而模擬結果與一個天線的架構相似。為了改善效能，我們也將振幅相位偏移調變用在相差空時調變上，並提出一種減少內圈點數增加外圈點數的作法，以改進錯誤率效能。 ;Wireless communications are required to transmit quantity of much data. How to transmit the same quantity of data in a shorter period of time is very important. Two-way relaying is a popular subject, where two terminal nodes transmit to each other with the help of the relay node. Two-phase two-way relaying (TPTWR) using physical-layer coding is a bandwidth efficient technique. Several TPTWR schemes using differential phase-shift keying (DPSK) which avoid the rate loss due to pilot symbols were proposed.
In this thesis, we discuss multiple antenna TPTWR systems by using differential unitary space-time modulation. For constellation in terminal nodes, we propose several schemes which provide a tradeoff between error performance and data rate. Error performances of the proposed schemes are similar as single antenna TPTWR systems. In order to improve error performance, we use differential unitary space-time codes with amplitude/phase-shift keying (APSK). We propose to reduce constellation points inner and increase outer constellation points.
