Pulse distortion and optimum transmit waveform for pulse-based UWB communications. (17th June 2009)

• Record Type: Journal Article
• Authors: Zhou, Chenming; Qiu, Robert C.
• Is Part Of: International journal of ultra wideband communications and systems. Volume 1:Number 1(2009)
• Page Start: 32
• Page End: 48
• Publication Date: 2009-06-17
• Subjects: optimum waveform design -- UWB communications -- ultra wideband -- time domain UTD-GTD -- ray tracing -- deterministic channel modelling -- pulse distortion -- time reversal -- optimum transmission waveforms; Wireless communication systems -- Periodicals; Ultra-wideband devices -- Periodicals; 621.382
• Languages: English
• ISSNs: 1758-728X

Abstract

This paper initiates a new investigation of optimum transmission waveforms in the presence of per-path pulse wave shape distortion – a physical mechanism unique to impulsive signals. First, the transient electromagnetic analysis is carried out to derive, for the first time, closed-form expressions for the impulse responses of several canonical channels that are suitable for communication engineers. Second, numerical calculation using the inverse Fourier transform of the frequency-domain expressions is compared with the derived closed-form expressions, to verify the validity of these derived impulse responses. Third, propagation mechanisms responsible for multipath and per-path pulse shape distortion can be clearly identified using the closed-form impulse responses. Finally, using these closed-form expressions as a departure point, optimum transmission waveforms determined by a Fredholm integration equation are investigated, for different physical mechanisms, including one path or no multipath (wedge), two paths (rectangular building) and more than two paths (two half plane waveguide).