OFDM系統之時間同步之DSP硬體實現

近年來由於數位訊號處理器(DSP)及超大型積體電路(VLSI)技術的進步，加上人們對於高速率的資料傳輸需求逐漸增加，所以擁有高效能的OFDM系統已廣泛應用於高速率數位通訊技術，如數位視頻廣播(DVB)、非對稱式數位用戶迴路(ADSL)、同時也是第四代行動通訊系統規範的核心技術。克服使用導頻符號後資源浪費的缺點，本文將探討一種基於DSP的OFDM同步系統的設計：使用OFDM符號(後半部分)插入到符號起始位置，構成循環字首（CP），並且配合符號定時同步和載波頻率同步的最大相似估計同步算法。通過軟體模擬建立系統的架構設計，硬體實現使用德州儀器的TMS320C6713完成OFDM同步系統。經過實驗的證明，驗證硬體實現的可行性。

關鍵字

同步；數位訊號處理器；最大相似估計；正交分頻多工

並列摘要

Since the rapid development of the Digital Signal Processor (DSP) and Very-Large-Scale Integration (VLSI) technology the requirement of high-speed data transmission increase gradually. Therefore, high-performance OFDM system has been widely used in high-speed digital communication technology, such as Digital Video Broadcasting (DVB), Asymmetric Digital Subscriber Line (ADSL) and the Fourth Generation Mobile communication System Standardized kernel Technologies. Using the pilot symbols to overcome the disadvantages of the waste of resources, this thesis investigates a DSP-based design of OFDM synchronization system. insert the OFDM symbol (rear part) into the symbol start position to establish compose the Cyclic Prefix (CP), and imply the Symbol Timing Synchronization and Frequency Carrier Synchronization Algorithm for the Maximum Likelihood Estimate Synchronization. more over, OFDM Synchronization system is implemented by simulation of software system and Hardware Implementation - the Texas Instruments (TI) of the TMS320C6713. The feasibility of hardware implementation is verified by experiments.

並列關鍵字

DSP ； Synchronization ； Maximum Likelihood Estimate ； OFDM

參考文獻

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[3] 孟繁瑋，超寬頻多頻帶正交分頻多工系統下窄頻干擾消除方法之DSP實現，私立中原大學電子工程學系碩士論文，2009。

[7] Simon Haykin. Communication Systems. John Wiley &Son, Inc,2000.

[8] Bernard Sklar. Digital Communications: Fundamentals and Applications, Prentice-Hall ,2002.

[9] Rulph Chassaing, Donald Reay. Digital Signal Processing and Applications with the TMS320C6713 and TMS320C6416 DSK. WILEY INTERSCIENCE, 2008.

國際替代計量

OFDM系統之時間同步之DSP硬體實現

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