- 學位論文
軟體無線電架構OFDM系統之數位基頻訊號處理平台實現
Develop the OFDM System based on Software Radio Architecture and Implement a Digital Baseband Signal Processing Hardware Platform
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摘要
隨著通信產業蓬勃的發展，使得現今訊號調變方式有著多樣化的選擇，而為了能將各種不同規格之系統整合於單一的平台上，軟體無線電技術正提供了多模終端的解決方案，其利用數位中頻取樣、多速率信號處理、基頻數位信號處理之技術，來實現無線通訊點對點展頻系統的數據語音傳輸。 本論文在軟體無線電架構下，進行正交分頻多工系統之收發機研究，並利用類比/數位轉換器(AD9226-12Bits 64MIPS ADC ) 、數位/類比轉換器(AD9762B-12Bits 125MIPS DAC)、TI TMS320C5416與XILINX VirtexII- XC2V1000實現一數位基頻訊號處理平台，基頻訊號採用OFDM系統調變，利用其次載波間相互正交的特性，使得頻譜間相互重疊，提昇頻譜的利用率，並減小子載波間的相互干擾。接收同步方面利用OFDM系統特有的短訓練符碼與長訓練符碼，來估測出載波頻率偏移量和通道響應並以循環字首做相關比較(Correlation)演算法達到接收端之相位、頻率以及時序之同步估測。
並列摘要
With vigorous developments in wireless technology, many signal modulation modes with various standards have elected. In order to integrate various wireless communications system in a single platform, the Software Defined Radio (SDR) technology is arising for this. The SDR provides digital IF sampling, multi-rate signal processing and baseband signal processing for implement wireless communication point to point transmission. This monograph presents a way how to implement a OFDM transceiver with SDR technique. We choice DSP processor (TI TMS320C5416DSK), FPGA (XILINX VirtexII- XC2V1000), ADC (AD9226-12Bits 64MSPS), and DAC (AD9762B -12Bits 125MSPS) for our major components. The baseband signal adopted OFDM modulation mechanics. Each sub-carrier has orthogonal characteristic, therefore the system decrease interference of every sub-carrier and promote the efficiently of frequency spectrum. Receiver synchronizer applied the short and long training symbol to achieve frequency offset, channel estimation, and applied the cyclic prefix to execute the correlation operation that can reach the synchronized estimation for phase, frequency, and timing.
並列關鍵字
HASH(0x95f9604)參考文獻
1. IEEE Std 802.11a-1999.
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