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Sensors 2010, 10(12), 11038-11063; doi:10.3390/s101211038

Optimal Waveforms Design for Ultra-Wideband Impulse Radio Sensors

1,2,* , 1,2
Key Lab of Universal Wireless Communications, Ministry of Education (MOE), Inner Box. 96, BUPT, Beijing 100876, China
Beijing University of Posts and Telecommunications (BUPT), Inner Box. 96, BUPT, Beijing 100876, China
Author to whom correspondence should be addressed.
Received: 20 October 2010 / Revised: 25 November 2010 / Accepted: 27 November 2010 / Published: 6 December 2010
(This article belongs to the Section Chemical Sensors)
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Ultra-wideband impulse radio (UWB-IR) sensors should comply entirely with the regulatory spectral limits for elegant coexistence. Under this premise, it is desirable for UWB pulses to improve frequency utilization to guarantee the transmission reliability. Meanwhile, orthogonal waveform division multiple-access (WDMA) is significant to mitigate mutual interferences in UWB sensor networks. Motivated by the considerations, we suggest in this paper a low complexity pulse forming technique, and its efficient implementation on DSP is investigated. The UWB pulse is derived preliminarily with the objective of minimizing the mean square error (MSE) between designed power spectrum density (PSD) and the emission mask. Subsequently, this pulse is iteratively modified until its PSD completely conforms to spectral constraints. The orthogonal restriction is then analyzed and different algorithms have been presented. Simulation demonstrates that our technique can produce UWB waveforms with frequency utilization far surpassing the other existing signals under arbitrary spectral mask conditions. Compared to other orthogonality design schemes, the designed pulses can maintain mutual orthogonality without any penalty on frequency utilization, and hence, are much superior in a WDMA network, especially with synchronization deviations. View Full-Text
Keywords: UWB-IR sensors; waveform design; orthogonality; waveform division multiple access UWB-IR sensors; waveform design; orthogonality; waveform division multiple access

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Li, B.; Zhou, Z.; Zou, W.; Li, D.; Zhao, C. Optimal Waveforms Design for Ultra-Wideband Impulse Radio Sensors. Sensors 2010, 10, 11038-11063.

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