本論文分為兩個部份。第一部分:我們將研究以單載波空時塊碼的通訊系統，並加入分碼多工系統及低複雜度軟式多使用者偵測技術，且考慮在具有符元間干擾的傳輸通道中運作，並且我們採用超級正交空時塊碼之基本架構所作的延伸使得傳送速度增加。在傳送端，使用結合超級正交空時塊碼與分碼多工系統、單載波空時塊碼又不失其三者特性的空時塊碼的架構，以兩根傳送天線為例，此架構每個使用者需要兩個展頻序列，來作為辨別使用者的方法，並且藉由多重籬柵碼調變，我們可提升傳送速度，並應用在多使用者上。在接收端我們利用”每個使用者使用不同的展頻碼”的系統特性，同時配合威特比原理設計之解碼器來做解碼。一個軟式的干擾消除裝置在接收端前段利用已精確得知的通道資訊，並且利用最小均方差之原理提供對編碼位元的可靠估測。
第二部分:我們針對頻率選擇性的衰減通道提出一種單載波傳輸的非同調空時調變碼的設計，並考慮時域上的通道是多輸入輸出的關係，在這裡無論發射端或接收端皆不知通道的狀態資訊下即可進行解碼。我們將分析最大可達到的分集增益和編碼增益，並列出設計碼的準則[24]，另外使用複數正交週期序列去設計空時碼的架構可提供最大分集增益的明確架構，也由於這種設計使得我們的系統可避免峰值對平均功率比太大的問題。由模擬數據顯示在相同條件設定下，我們提出的系統在區塊錯誤率的效能上優於正交分頻多工(OFDM)系統。

This dissertation includes two parts. The first part deals with time-reversal single carrier orthogonal space-time blocked technique employed in a multi-access CDMA uplink system over a quasi-static frequency selective fading channel. To avert the rate loss problem normally encounter in convolutionally coded space-time block modulation, we assign each user multiple spreading sequences so as to expand constellation size of orthogonal space-time codes. At receiver,one approaches, namely single-user detectors based on minimum mean-square error (MMSE) sense. Indeed, in computer simulations this receivers in terms of bit error rate (BER) indicates that the computational complexity was traded for performance gain.
We, rather than assume channel state information (CSI) known to both transmitter and receiver, consider noncoherent space-time modulation in single-carrier block system over quasi-static frequency-selective fading channel. Indeed, capitalizing on multi-channel input-output relation in time domain, we construct space-time codes of constant signaling amplitude by means of complex orthogonal sequences to achieve maximal diversity gain along with coding advantage. Numerical result indicates that SC block system can outperform the orthogonal frequency division multiplexing (OFDM) counterpart, which additionally suffers from higher peak-to-average power ratio (PAPR), in terms of block error rate (BLER) under the same scenario conducted in simulations

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