Data-Aided Timing Acquisition in UWB Differential Transmitted Reference Systems.
ABSTRACT 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
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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 .04/2012; DOI:10.5121/ijcnc.2012.4212
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ABSTRACT: Synchronization remains one of the biggest challenges in the ultra-wideband (UWB) impulse radio system. In this paper, a frame-level synchronization algorithm is proposed in differential transmitted reference (DTR) UWB systems in the multipath environment. The signal structure is judiciously designed with the aided data and m-sequence code. Enjoying the fine property of m-sequence autocorrelation function, the proposed algorithm can suppress the noise and inter-frame interference. Moreover, it has very low complexity. Simulation results demonstrate the good performance of the proposed acquisition scheme.
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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.Positioning, Navigation and Communication, 2007. WPNC '07. 4th Workshop on; 04/2007