DOI: 10.1109/PIMRC.2006.254398 Conference: Proceedings of the IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2006, 11-14 September 2006, Helsiniki, Finland
Timing acquisition constitutes a major challenge in realizing highly efficient ultra-wideband (UWB) systems for applications such as indoor wireless communications. To bypass channel estimation the transmitted reference (TR) signaling is a promising candidate. In this paper, we suggest a novel data-aided timing acquisition technique for frame-level synchronization in differential transmitted reference (DTR) UWB systems. Being based on parallel integrate-and-dump (I&D) operations within different pulse-pair correlator branches, the proposed timing acquisition technique performs particularly well at higher signal-to-noise ratio (SNR). The good performance of it is confirmed by simulation results
"Each located in its own frame. It was shown in ,  and  that efficient demodulation of any UWB systems requires at the receiver an accurate timing estimation. This is due to the fact that the information bearing pulses are ultra short. "
[Show abstract][Hide abstract] ABSTRACT: Blind synchronization constitutes a major challenge in realizing highly
efficient ultra wide band (UWB) systems because of the short pulse duration
which requires a fast synchronization algorithm to accommodate several
asynchronous users. In this paper, we present a new Code Block Synchronization
Algorithm (CBSA) based on a particular code design for a non coherent
transmission. Synchronization algorithm is applied directly on received signal
to estimate timing offset, without needing any training sequence. Different
users can share the available bandwidth by means of different spreading codes
with different lengths. This allows the receiver to separate users, and to
recover the timing information of the transmitted symbols. Simulation results
and comparisons validate the promising performance of the proposed scheme even
in a multi user scenario. In fact, the proposed algorithm offers a gain of
about 3 dB in comparison with reference .
[Show abstract][Hide abstract] ABSTRACT: Differential Transmitted Reference (DTR) ultra-wideband (UWB) impulse radio (IR) system is one of the most attractive solutions for realizing non-coherent low data rate and low complexity UWB systems. Indeed, Transmitted Reference (TR) signaling, in combination with an Autocorrelation Receiver(AcR), allows a lower design complexity compared to coherent receivers. In this paper, the design of DTR-UWB radio modules for wireless sensor networks (WSN), capable of communication and localization, is addressed. Bit error rate (BER) performance of the DTR-UWB receivers conditioned on a channel realization is analyzed. The modelling of low complexity DTR-UWB systems using equivalent system models is presented. The average BER is verified through simulation for different signal-to-noise ratio (SNR) values, and is also compared to the average BER derived using the equivalent system model. We suggest a data-aided time of arrival (TOA) estimator for DTR-UWB systems, using least squares estimation technique and the equivalent system model.
[Show abstract][Hide abstract] ABSTRACT: The timing acquisition constitutes a major challenge in ultra-wideband impulse radio (UWB-IR). The challenge is not only in detecting pulses with very short duration, but also in considering RMS delay spread caused by multipath channel. This paper presents a novel data-aided synchronization acquisition algorithm. With judiciously designed algorithm and training sequence, the proposed algorithm overcomes the impact of RMS delay spread. This algorithm is based on differential transmitted reference receivers. It can be applied for low complexity and low-data-rate (LDR) applications, such as sensors networks. The simulation results demonstrate that the proposed acquisition algorithm has better performance in probability of detection than conventional acquisition algorithms. In addition it has low complexity.
Computing, Communication, Control, and Management, 2008. CCCM '08. ISECS International Colloquium on; 09/2008
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