Noncoherent ultra-wideband systems

Witrisal, Klaus; Leus, Geert; Janssen, G. C. A. M.; Pausini, M.; Troesch, F.; Zasowski, T.; Romme, Jac

doi:10.1109/msp.2009.932617

Cited by 247 publications

(137 citation statements)

References 77 publications

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“…Several modulation techniques are proposed in the literature using narrow pulses [12,32]. Primarily, they are variants of pulse position modulation (PPM), binary phase shift keying (BPSK) or on-off keying (OOK).…”

Section: Pulse Construction and System Modelmentioning

confidence: 99%

Spectral efficient IR-UWB communication design for low complexity transceivers

Yajnanarayana

Dwivedi

Angelis

et al. 2014

J Wireless Com Network

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Ultra wideband (UWB) radio for communication has several challenges. From the physical layer perspective, a signaling technique should be optimally designed to work in synergy with the underneath hardware to achieve maximum performance. In this paper, we propose a variant of pulse position modulation (PPM) for physical layer signaling, which can achieve raw bitrate in excess of 150 Mbps on a low complexity in-house developed impulse radio UWB platform. The signaling system is optimized to maximize bitrate under practical constraints of low complexity hardware and regulatory bodies. We propose a detector and derive its theoretical performance bounds and compare the performance in simulation in terms of symbol error rates (SER). Modifications to the signaling, which can increase the range by 4 times with a slight increase in hardware complexity, is proposed. Detectors for this modification and a comparative study of the performance of the proposed UWB physical layer signaling schemes in terms of symbol error rates are discussed.

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Section: Pulse Construction and System Modelmentioning

confidence: 99%

Spectral efficient IR-UWB communication design for low complexity transceivers

Yajnanarayana

Dwivedi

Angelis

et al. 2014

J Wireless Com Network

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“…Also, the performance of Rake receiver is very sensitive to mistiming [8,9] and channel estimation errors [34]. These limitations of the Rake receiver motivate the use of non-coherent receivers for UWB [5][6][7], where the correlation between the received signal and a template derived from the received signal itself is performed. Another interesting alternative to the Rake receiver is proposed in [16] where a template, called synchronized aggregate template (SAT), is achieved as a by-product of the synchronization algorithm.…”

Section: Demodulationmentioning

confidence: 99%

“…The lowcomplexity non-coherent receivers (transmitted reference [5], differential detector [6], etc.) slightly relax the synchronization requirements and typically need an accuracy in the nanoseconds range [7]. Nevertheless, in both cases, the synchronization requirements remain very strict.…”

Section: Introductionmentioning

confidence: 99%

Low-complexity synchronization algorithms for orthogonally modulated IR-UWB systems

Akbar

Rădoi

Azou

et al. 2013

J Wireless Com Network

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Timing synchronization is a major issue for any communication system since it is essential to ensure its stable operation and reliable performance. In this paper, we compare two low-complexity synchronization algorithms for impulse radio ultra-wideband (IR-UWB) system, employing orthogonal pulse shape modulation (PSM). The two widely adopted modulation schemes for IR-UWB systems are binary pulse amplitude modulation and binary pulse position modulation. However, the possibility of generating orthogonal UWB pulses in recent years has motivated the use of orthogonal PSM which is particularly attractive as high-order modulation and also due to its possible robustness against ISI, and therefore is the focus of this paper. Relying on the unique signal format, the first algorithm applies simple overlap-add operation followed by energy detection to achieve synchronization. This approach is semi non-data-aided (NDA) because a part of the signal is specifically reserved to help enable synchronization. The other algorithm, on the other hand, exploits the discriminating nature of well-designed polarity codes and employs a series of code word matching and averaging operations to achieve synchronization. This approach is full NDA as there is no need to interrupt the data transmission. Based on the judicious change in the phase of transmitted signal applied for synchronization purposes, the second algorithm can also be used to extract synchronized aggregate templates. These templates are then used in demodulation, resulting in a low-complexity non-coherent alternative to complex Rake receivers. The two compared timing algorithms rely on simple overlap-add operations and thus remain operational under practical UWB settings. Simulation results are provided to demonstrate the efficient performance of proposed timing estimators.

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“…On one hand, the ultra-short impulses make it possible to resolve and combine signal echoes with path length differential down to 1 ft exploiting the diversity inherent in the multipath channel and improving the position accuracy. On the other hand, the new technical (Witrisal et al, 2009) challenges are posed: (1) analog-to-digital converters (ADCs) working at the Nyquist rate are in general very expansive and power demanding; (2) the synchronization which is accomplished at the scale of sub nanosecond duration is extremely complex; (3) capture a sufficient amount of the rich multipath diversity need accuracy channel estimation. Compare to the transmitter easily implement, the IR-UWB receiver are too complex.…”

Section: Introductionmentioning

confidence: 99%