利用調變濾波器組作分頻多工

Abstract

這篇論文的目的在探討使用可以完美重建的濾波器組所作的數位化分頻多 工。如果有一個可以完美重建的濾波器組，以它的合成端架構作多工器的 架構，及以它的解析端架構作解多工器的架構，那麼就可以得到一個可以 完美重建的傳輸多工器。如此數位化操作的優點就是頻寬的使用率比較高 ，而且頻帶的選定比較容易，只要選擇調變用的內插濾波器。 Digital implementation of frequency division multiplexing is investigated withthe use of perfect reconstruction filter bank. The PR filter bank is shown tobe equivalent to a cross talk free trans-multiplexer with synthesis section as the multiplexing input and the analysis section as the de-multiplexing output. With such filter bank implementation, both the QAM multiplexing and the VSB multiplexing are simulated. The advantage of such digital implementation is that the bandwidth utilization can be maximized and the band assignment can beeasily achieved as the selection of the modulation interpolation filter.