大部分的相差空間調變研究，都是使用MPSK訊號。相較於MPSK訊號，APM (amplitude phase modulation)訊號包括APSK和QAM (quadrature amplitude modulation)，是一種比較具有頻寬效率的選擇。既有文獻中相差空間調變使用APSK訊號的只有幾篇，但是都沒人研究使用QAM。在本篇論文，我們研究使用APM的相差空間調變和長區塊相差空間調變。當相差空間調變使用多區塊檢測時，我們考慮使用16QAM訊號，不過原本的檢測式無法針對16QAM使用，因此在本篇論文提出了新的檢測方式，其結果與使用16APSK訊號一樣，當觀察的區塊越長，其錯誤率接近同調檢測。最後，我們將16QAM與16APSK使用在長區塊相差空間調變的系統架構。當在接收天線等同傳送天線的情況下，隨著區塊長度的增加，錯誤率會變好。;Most of the research on differential spatial modulation (DSM) utilizes MPSK signals. Compared to MPSK signals, APM (amplitude phase modulation) signals, including APSK and QAM (quadrature amplitude modulation), offer a more bandwidth-efficient choice. Although there are only a few existing studies on DSM using APSK signals, none of them have explored the use of QAM. In this paper, we investigate the use of APM in both differential spatial modulation and long-block DSM. When employing multi-block detection for DSM with APM, we consider using 16QAM signals. However, the existing detection scheme is not applicable to 16QAM. Therefore, we propose a new detection method in this paper, which achieves the same performance as using 16APSK signals. As the observation block length increases, the error rate approaches coherent detection. Finally, we present a system architecture for long-block DSM using both 16QAM and 16APSK. Under the assumption of matched transmit and receive antennas, the error rate improves with increasing block length.
