本篇論文提出改良式之多天線無線廣播系統，能夠提供具有不同等重要性的多層資訊傳送。系統編碼端為了保護傳送資訊，會先以低密度同位檢查碼(LDPC)對原始資訊進行編碼，而不同層的資訊再以對應的空時碼(STC)編碼後合併傳送。對接收端而言，多層的資訊則能被數種解碼流程以不同品質解出。演算法中低複雜度的解碼流程，能透過只進行系統化碼(systematic code)中訊息部分的解碼，提供使用者最基礎的通訊品質，特別適合應用於通道信號雜訊比(SNR)較大的狀況；而適時的採用LDPC碼則能有效糾正接收端的錯誤資訊。對系統中採用合作式通訊的使用者，能獲得類似MIMO系統的空間分集(Spatial diversity)增益，當多層資訊經還原後，能提供較佳的通訊品質。除此之外，作者還對原始的LLR運算方法進行優化，提出了聯合LLR偵測演算法，大幅的減少了系統運算複雜度。最後，論文當中也進行了系統模擬，藉由不同的模擬參數與解碼流程設定，對提出演算法的功能性與效能進行驗證。

In this thesis, an improved multi-antenna wireless broadcasting system is introduced to provide unequally protection for layered bitstream transmission. The broadcast station protects the multi-layer sources with Low-Density Parity-Check (LDPC) codes and then transmits with a combination of different layers of space-time codes (STC). For the receiver, different levels of decoding processes can be adopted to retrieve different layers of source information. For a low complexity terminal, a basic quality can be maintained by only decoding the message part from the systematic codewords without LDPC, especially for channels with high signal-to-noise ratio (SNR). For terminals in noisy environments, the LDPC decoding can be performed to correct transmission errors. With cooperative communication, more layered bitstream can be retrieved to enhance the quality. Furthermore, this thesis also brings up the optimized joint Log-Likelihood Ratio (LLR) detection to reduce the computational complexity. Simulations are conducted to compare the performances of the proposed scheme in different settings.

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