Equivalent system model and equalization of differential impulse radio UWB systems

Authors:
K. Witrisal;G. Leus;M. Pausini;C. Krall
Affiliations:
Christian Doppler Lab. for Nonlinear Signal Process., Graz Univ. of Technol., Austria;-;-;-
Venue:
IEEE Journal on Selected Areas in Communications
Year:
2006

Citing 0
Cited 9

Multiuser performance of M-ary orthogonal coded/balanced UWB transmitted-reference systems

IEEE Transactions on Communications
Combined synchronization and power control for differentially-encoded di-symbol time-division multiuser impulse radio

IEEE Transactions on Wireless Communications
A novel adaptive bilinear filter based on pipelined architecture

Digital Signal Processing
Detection and identification of NBI for multichannel UWB autocorrelation receivers

WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Digital receiver design for transmitted reference ultra-wideband systems

EURASIP Journal on Wireless Communications and Networking - Special issue on synchronization in wireless communications
Reduced complexity demodulation and equalization scheme for differential impulse radio UWB systems with ISI

SARNOFF'09 Proceedings of the 32nd international conference on Sarnoff symposium
Integration interval determination algorithms for BER minimization in UWB transmitted reference pulse cluster systems

IEEE Transactions on Wireless Communications
Full length article: Hybrid coherent and frequency-shifted-reference ultrawideband radio

Physical Communication
Full length article: Accurate analysis of a high data rate UWB-DTR system in dense multipath fading channels

Physical Communication

Quantified Score

Hi-index	0.07

Visualization

Abstract

A discrete-time equivalent system model is derived for differential and transmitted reference (TR) ultra-wideband (UWB) impulse radio (IR) systems, operating under heavy intersymbol-interference (ISI) caused by multipath propagation. In the systems discussed, data is transmitted using differential modulation on a frame-level, i.e., among UWB pulses. Multiple pulses (frames) are used to convey a single bit. Time hopping and amplitude codes are applied for multi user communications, employing a receiver front-end that consists of a bank of pulse-pair correlators. It is shown that these UWB systems are accurately modeled by second-order discrete-time Volterra systems. This proposed nonlinear equivalent system model is the basis for developing optimal and suboptimal receivers for differential UWB communications systems under ISI. As an example, we describe a maximum likelihood sequence detector with decision feedback, to be applied at the output of the receiver front-end sampled at symbol rate, and an adaptive inverse modeling equalizer. Both methods significantly increase the robustness in presence of multipath interference at tractable complexity.