寬頻正交分頻多工系統之可程式化晶片施行

寬頻正交分頻多工系統在現今新一代的通訊技術方面佔有極重要的地位，因此本篇論文參考了802.16e-2005的正交分頻多工系統規格，設計了一個可程式化的電路架構。此架構中使用了16-QAM(Quadrature Amplitude Modulation)的調變技術，並且在正交分頻多工系統中最重要的快速傅立葉轉換（Fast Fourier Transform, FFT）電路使用了Radix-22 DIF FFT演算法與Pipeline-based的Single-path Delay Feedback (SDF)電路架構來做為256點的FFT設計主軸，在濾波器電路方面我們設計了12階的脈波整形濾波器電路架構並且搭配倍頻電路加以實現。經由Matlab的系統模擬，決定出最佳的系統效能與定點數的位元數長度，最後以FPGA硬體實現的系統電路中，我們所做的正交分頻多工系統工作速率已經到達65Mbps的高速運作，因此我們驗證了寬頻正交分頻多工之可行性。

關鍵字

正交分頻多工系統；脈波整形濾波器

並列摘要

This thesis designed the programmable circuit of OFDM (Orthogonal Frequency Division Multiplexing) system .The FFT (Fast Fourier Transform) circuit used Single-path Delay Feedback (SDF)of the algorithm and Radix-22 DIF FFT circuit structure collocate in the programmable circuit. This method can design the programmable FFT circuit. The filter of OFDM system used 12 steps SRRC (Square Root Raised Cosine) filter circuit and Sampling circuit, and have used 16-QAM (Quadrature Amplitude Modulation) the technology of modulator. So we can be via detailed systematic circuit simulation, we will realize in order to prove the circuit really feasible with FPGA hardware.

並列關鍵字

OFDM ； IFFT/FFT ； SRRC filter ； FPGA

參考文獻

[1] H. Harada, and R. Prasad, 「A new multi-carrier CDMA/TDD transmission scheme based on cyclic extended spread code for 4th generation mobile communication system,」 Personal Wireless Communications, pp.319-323, Dec. 1997.

Google Scholar

[2] CR. Casal, F. Schoute, and R. Prasad, 「A novel concept for fourth generation mobile multimedia communication,」 IEEE VTC-1999/Fall., vol. 1, pp.381-385, Sept. 1999.