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Capacity Analysis of Orthogonal Pulse-Based TH-UWB Signals

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Abstract

The paper studies the capacities of time hopping ultra wideband (TH-UWB) systems by adopting orthogonal pulse-based modulation schemes in a multipath environment with the consideration of multiple access interference (MAI) and inter symbol interference (ISI). Recently, orthogonal pulse-based modulation schemes such as pulse shape modulation (PSM), biorthogonal PSM (BPSM) and the combination of orthogonal pulse position modulation (OPPM) and BPSM have been proposed for UWB system to reduce ISI and MAI. In this paper, we first investigate the influences of ISI and MAI on the capacities of TH-UWB systems in terms of signal-to-interference and noise ratio (SINR) for high-order modulation schemes based on various sets of orthogonal pulses. How mutual information varies with the number of multipath components (MPCs) is then analyzed. The complete mathematical analysis and simulation results are provided in detail. When maximizing the mutual information, the Gaussian distribution approximate is assumed to describe the characteristics of MAI and ISI. Simulation results are provided to verify the theoretical analysis. Some conclusions are drawn thereafter, such as that capacity depends on the pulse patterns adopted and mutual information varies with inversely proportional to the number of MPCs. We also observed that the capacities of UWB systems for OPPM-BPSM schemes are larger than those of PSM and BPSM schemes.

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Authors and Affiliations

  1. The School of Electrical and Electronic Engineering Department, Nanyang Technological University, Singapore, Singapore

    Sudhan Majhi

  2. The Electrical and Computer Engineering, University of Michigan-Dearborn, Dearborn, MI, USA

    Paul Richardson

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  1. Sudhan Majhi
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  2. Paul Richardson
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Correspondence to Sudhan Majhi.

Additional information

The part of this research work was presented at VTC Fall 2008, Canada.

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Majhi, S., Richardson, P. Capacity Analysis of Orthogonal Pulse-Based TH-UWB Signals. Wireless Pers Commun 64, 255–272 (2012). https://doi.org/10.1007/s11277-010-0196-0

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  • DOI: https://doi.org/10.1007/s11277-010-0196-0

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