最近在2010年提出一種使用查表法的差分編碼，而此新的差分編碼已經延伸應用至差分空時調變。在本篇論文提出了新的例子，可以得到滿意的錯誤效能並避免星座圖擴展；此外我們也嘗試了多重區塊差分編碼使用查表法。為了進一步的提升錯誤效能，我們提出了差分空時籬柵碼，並設計及使用電腦找出好的碼。但是，得到的籬柵碼之最小非同調距離並不大，因此沒有獲得滿意的錯誤效能。Recently, a new differential encoder was proposed by a look-up table instead of a rule, and the new differential encoding was extended to differential space-time modulation (DSTM). In this thesis, we propose new examples of DSTM using a look-up table. The proposed examples have satisfactory error performance without constellation expansion. In addition, we try multiple-block differential encoding by a look-up table. To further enhance the error performance, we also propose differential space-time trellis code (DSTTC) and construct codes as well as use computers to search good codes. However, the obtained codes of DSTTC are unsatisfactory because their minimum noncoherent distances are small.
