適用於經由頻率選擇性衰減通道傳送的OFDM信號之修正型GLRT解調器

Abstract

針對經由頻率選擇性衰減通道傳送的OFDM信號，我們在本篇論文提出一個結合錯誤更正以及通道估計的修正型GLRT解調器。模擬結果顯示，修正型GLRT解調器比GLRT解調器有更好的效能。並且我們也為修正型GLRT解調器推導可以降低其解調複雜度的演算法。

In this thesis, we propose the so-called Modified GLRT demodulator for combined channel estimation and data correction for OFDM signals transmitted over a frequency selective channel with unknown channel coefficients. Simulation results confirm that the Modified GLRT can achieve an evidently better performance than the traditional GLRT. In order to reduce the demodulation complexity, we further derive the recursive metric formula based on the Modified GLRT criterion for use of the priority-first search algorithm. This results in a much lower demodulation complexity in comparison with the exhaustive demodulator.