單載波區塊傳輸系統已經被提出來解決頻率選擇性衰減通道現象，它不像正交分頻多工一樣具有高峰值對平均功率比(PAPR)和載波頻率偏移敏感度(CFO)。針對符號間干擾(ISI)，使用快速傅立葉轉換(FFT) 計算及足夠的護衛區間(GI)的頻域等化可以代替複雜的一般時域等化。
在此論文中，我們討論的三種系統分別是使用滑動解展頻的新架構單載波區塊傳輸直序分碼多工、片碼間插區塊展頻(CIBS)直序分碼多工、以傳統解展頻方式的單載波區塊傳輸直序分碼多工。我們分別比較他們在單用戶、同步用戶、和非同步用戶的情況。此外，我們應用這些系統在極寬頻(UWB)通道和頻率選擇性瑞雷衰減通道裡觀察它們的效能。
最後，為了消除多用戶干擾(MUI)，我們提出幾個決策反饋偵測器。它們是平行決策反饋偵測器和連續決策反饋偵測器的延伸。我們將分別在同步和非同步使用者系統下發展它們。

The single-carrier block transmission (SCBT) system has been proposed to solve the frequency-selective fading channel problem, unlike orthogonal frequency division multiplexing (OFDM), SCBT systems do not have high peak-to-average power ratio (PAPR) and is less sensitive to carrier frequency offset (CFO). As for intersymbol interference (ISI), frequency-domain equalization with fast Fourier transform (FFT) computation and sufficient guard interval (GI) can substitute for complex conventional time domain equalization.
In this thesis, we discuss three systems which are SCBT DS-CDMA with sliding despreading, chip-interleaved block spread (CIBS) CDMA, and SCBT DS-CDMA with traditional dispreading, respectively. We compare them in single user’s, synchronous users’, and asynchronous users’ conditions, respectively. Besides, we apply these systems in ultra wideband (UWB) channel and frequency selective Rayleigh fading channel to observe their performance.
Finally, we propose several decision feedback detectors to eliminate multiuser interference (MUI). They are extensions from parallel decision feedback detector or the successive one. We will develop them in synchronous and asynchronous users’ systems.

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