多天線技術通常用於無線通訊系統中以提高傳輸速率和傳送多樣性。空間調變 是一種多天線技術，一次只使用一個發射天線。通過選擇傳送天線，發送額外的資料位元。其中，正交空間調變是空間調變的一種，且比傳統空間調變有更高的傳送速率。後續有人提出高多樣性的正交空間調變，它可以達到傳送多樣性為二。
本論文包含兩個部分，皆針對傳送多樣性為二的正交空間調變進行改良。在第一部份中，我們將位元聯合選擇實部與虛部天線矩陣，用來增加傳送多樣性為二的正交空間調變的資料傳送速率，且有兩種位元映射方法。在第二部分中，將原本的論文傳送多樣性為二的架構，延伸至傳送多樣性為三或四。我們也與空時區塊編碼空間調變進行比較，在傳送多樣性為二的情況下，正交空間調變有較好的錯誤率，而在傳送多樣性為四的情況下，空時區塊編碼空間調變擁有更好的錯誤率。

Multiple antenna techniques are commonly used in wireless communication systems to enhance transmission rates and provide transmit diversity. Spatial modulation(SM) is a type of multiple antenna technique that uses a single transmit antenna each time, transmitting additional data bits by selecting the transmit antenna. Among them, quadrature spatial modulation(QSM) is a form of spatial modulation, and it contains higher transmission rates than traditional spatial modulation. Later, someone proposed a high diversity quadrature spatial modulation, which can achieve transmit diversity of two.
There are two sections in this thesis, both focusing on improvements of DA-QSM. In the first part, we select the real and imaginary antenna matrices jointly by bits to increase the data transmission rates of DA-QSM, and there are two bit¬ mapping methods. In the second part, the structure of the original thesis with a transmit diversity of two is extended to transmit diversity of three of four. We also compare it with space-time block coded spatial modulation(STBC-SM). DA-QSM has better error rates in the case of transmit diversity of two, while STBC-SM achieves superior error rates in the case of transmit diversity of four.

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