基于廣義Gabor變換的最優(yōu)LOFDM系統(tǒng)的脈沖成形
Pulse-Shaping Based on Generalized Gabor Transform for Optimal LOFDM System
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摘要: LOFDM(Lattice Orthogonal Frequency Division Multiplexing )是時頻彌散信道上的一種高速數(shù)據(jù)傳輸技術。但當LOFDM系統(tǒng)的脈沖成形濾波器不具有最優(yōu)的時頻局域化特性時，必將引入嚴重的ISI和/或ICI。因此脈沖成形濾波器的設計是最優(yōu)LOFDM系統(tǒng)設計的重要組成部分。Strohmer和Beav(2001,2003)給出了一種LOFDM脈沖成形濾波器的設計方法，但是計算量較大。為此，該文提出了一種廣義Gabor變換，通過構造廣義緊致Gabor原子來完成最佳LOFDM脈沖成形濾波器的設計的數(shù)值實現(xiàn)。理論分析和仿真試驗都證明該方法比Strohmer和Beaver給出的方法更簡單有效。Abstract: Lattice Orthogonal Frequency Division Multiplexing(LOFDM) is a promising technique for high data-rate transmission in double(namely time-frequency) dispersive channel. But, as pulse shaping filters of LOFDM system is badly-localized, it is certainty that ISI and/or ICI be introduced. Therefore, design of pulse shaping filters is an important task for design of optimal LOFDM system. Currently, Strohmer and Beaver(2001, 2003) present an approach to design of pulse shaping filters for optimal LOFDM systems, but, it is computatively complex. In this paper, a generalized Gabor transform is proposed. Utilizing an approach of attained generalized tight Gabor atoms, the time-frequency well-localized pulse shaping filters can be designed for optimal LOFDM system. It is showed through theory analysis and simulative experiment that this method is more efficient and simpler than that of Strohmer and Beaver(2001, 2003).
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