BER sensitivity to mistiming in ultra-wideband impulse Radios-part I: nonrandom channels
IEEE Transactions on Signal Processing
Optimal pilot waveform assisted modulation for ultrawideband communications
IEEE Transactions on Wireless Communications
A GLRT approach to data-aided timing acquisition in UWB radios-Part II: training sequence design
IEEE Transactions on Wireless Communications
Low-complexity blind synchronization and demodulation for (ultra-)wideband multi-user ad hoc access
IEEE Transactions on Wireless Communications
Channel estimation for ultra-wideband communications
IEEE Journal on Selected Areas in Communications
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Synchronization is a performance-critical factor in all communication systems, but becomes particularly challenging in ultra-wideband (UWB) radios due to the ultra-short length of the transmitted pulses. Presence of severe inter-symbol interference (ISI) and multi-user interference (MUI) render the synchronization task even more difficult. The present paper deals with a blind synchronization and demodulation scheme which relies on intermittent transmission of nonzero mean symbols. This transmission pattern enables MUI- and ISI-resilient timing acquisition via energy detection and low-complexity demodulation by correlating the received waveform with a synchronized aggregate template (SAT). The resultant SAT receiver offers distinct advantages over the traditional RAKE and has remarkably low-complexity. Its blind operation nicely fits the requirements of multi-user ad hoc access and its ability to handle ISI is particularly attractive for UWB communications. Analytical performance evaluation of the novel timing estimator and the SAT demodulator is provided along with comparisons with the RAKE receiver for a single user link without ISI. Simulations confirm the analytical results and corroborate the high potential SAT-based UWB modems have for deployment.