在本篇論文中，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為多輸入多輸出的關係，在這裡無論發射端或接收端皆可在不知通道的狀態資訊下即可進行解碼。之後我們將此設計結合協力式分集技術，並且使用放大前送(Amplify-and-Froward)作為中繼方法，在此考慮訊號源到中繼點(S→R)、中繼點到目的地(R→D)及訊號源到目的地(S→D)分別經過不同的頻率選擇性衰減通道，並假設在完美的功率控制以及高訊雜比的環境之下，我們將分析最大可達到的分集增益和編碼增益，並列出設計編碼的準則，另外使用複數正交週期序列設計空時碼的架構將可提供最大分集增益的架構，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。電腦模擬結果將顯示不同的頻率選擇性的衰減通道以及不同的編碼設計所呈現的分析結果。

This dissertation, we assume channel state information (CSI) is unknown to both transmitter and receiver, consider non-coherent 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. Later, we will combine this design code with Relay-assisted cooperative communication and amplify-and-forward strategy is employed. We consider a single-relay scenario where the source-to-relay, relay-to-destination, and source-to-destination links experience possibly different frequency-selective channels. Under the assumption of perfect power control for the relay terminal and high signal-to-noise ratio for the underlying links, our analysis are able to achieve a maximum diversity gain and coding gain. Single-carrier block system can additionally make us not to suffer from high peak-to-average power ratio (PAPR). An extensive Monte Carlo simulation study will show different simulation results under different frequency-selective channels and coding design.

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