循環字首及補零正交分頻多工系統經預編碼後之頻譜比較

Spectrum Comparisons of Precoded CP-OFDM and ZP-OFDM Systems

盧明宏(Ming-Hung Lu)

指導教授 ： 鐘嘉德 ； 魏瑞益

國立中央大學/資訊電機學院/通訊工程學系/碩士(2006年)

摘要

由於正交分頻多工系統（ Orthogonal Frequency Division Multiple, OFDM ）已成為現今寬頻通訊系統之重要技術，因此改進OFDM之性能已成為重要的課題。在本篇論文中我們將針對當OFDM訊號在通過解決ICI問題、增加分集效應以及降低峰均值之預編碼後的頻譜效應來討論，並比較各個演算法外頻譜（out of band）及內頻譜平坦度(in-band flatness)的差異。

關鍵字

正交分頻多工系統 ； 功率頻譜密度 ； 頻譜

並列摘要

Orthogonal Frequency Division Multiple has become one of the key technologies in broadband communication systems nowadays. Improving the system performance of OFDM is therefore essential. The precoded-OFDM schemes for solving ICI problem, increasing diversity, and reducing PAPR are discussed in this thesis, inclusive of comparing the differences between out-of-band spectrum and in-band flatness.

並列關鍵字

Spectrum ； OFDM ； Power Spectral Density

參考文獻

Taiwan, 2005.

[1] J. A. C. Bingham, “Multicarrier modulation for data transmission: An

idea whose time has come,” IEEE Trans. Commun., vol. 28, pp. 5–14,

May 1990.

[2] S. B. Weinstein and P. M. Ebert, “Data transmission by frequency