隨著衛星通訊技術的迅速發展，低軌道衛星(Low Earth Orbit, LEO)與地面站之間的通訊需求日益增加。其中，DVB-S2 與 DVB-RCS2 作為目前主流的衛星通訊標準，廣泛應用於現代衛星系統中。本研究結合這兩種標準的優點，並透過 RFSoC 平台設計與實現一套可參數控制的類 DVB-S2 規格突發傳輸收發機架構，以兼顧高效能與彈性化的設計需求。 本研究保留 DVB-S2 在適應性調變與編解碼方面的核心流程，同時導入 DVB-RCS2 中的突發傳輸(Burst Transmission)與分時控制概念。系統假設衛星與使用者終端之間已透過 Forward Link(DVB-S2(X) )完成初步的頻率同步，著重探討 Return Link(DVB-RCS2)中的突發傳輸設計。具體而言，發射端將 DVB-S2 的 PL Frame 加入前導碼(Preamble)並封裝為 Burst Frame，並透過可參數控制器動態調整傳輸長度；接收端則進行升取樣，針對前導碼執行相關性檢測，以估測最佳初始時間相位與載波相位偏差，從而大幅縮短後續同步模組的收斂時間。整體設計除可有效降低發射端功耗、提升頻譜利用率外，亦透過資料輔助之預同步策略，提升突發傳輸下的符碼時間同步與載波相位同步效率。 ;With the rapid advancement of satellite communication technologies, the demand for communication between Low Earth Orbit (LEO) satellites and ground stations has been steadily increasing. Among the widely adopted standards in modern satellite communication systems are DVB-S2 and DVB-RCS2. This study integrates the strengths of both standards and proposes a parameterizable burst-mode transceiver architecture based on a DVB-S2-like structure, implemented on an RFSoC platform to achieve both flexibility and efficiency.
The proposed design retains the core processing flow of DVB-S2, particularly its adaptive modulation and coding features, while incorporating the burst transmission and time-division multiplexing mechanisms of DVB-RCS2. Under the assumption that initial frequency synchronization has already been established between the satellite and the user terminal via the Forward Link (DVB-S2(X)), this study focuses on the design of the Return Link (DVB-RCS2) burst transmission mechanism. Specifically, the transmitter appends a preamble to the DVB-S2 PL Frame and encapsulates it into a Burst Frame, with a configurable burst length. On the receiver side, the incoming signal is oversampled, and correlation with the known preamble is performed to determine the optimal initial timing phase and carrier phase offset. This enables rapid convergence of subsequent synchronization modules.
The proposed design not only reduces transmitter power consumption and improves spectral efficiency but also accelerates receiver synchronization through a data-aided pre-synchronization strategy, making it well-suited for intermittent transmission scenarios in LEO satellite communication systems.
