Channel characterization of time reversal UWB communication systems

Abbasi‐Moghadam, Dariush; Vakili, Vahid Tabataba

doi:10.1007/s12243-010-0189-8

Cited by 12 publications

(12 citation statements)

References 13 publications

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“…The RMS delay value has a direct impact on the ISI of a communication channel [11,25]. If the symbol time is sufficiently larger than the RMS delay spread (∼10 times larger), then the channel is approximately ISI free.…”

Section: Performance Characterisation Metricsmentioning

confidence: 99%

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Phase compensation communication technique against time reversal for ultra‐wideband channels

Dezfooliyan¹,

Weiner²

2013

IET Communications

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Phase compensation (PC) prefiltering is experimentally investigated for multipath channels over the frequency band spanning 2-12 GHz, a topic which to the best of the authors knowledge has not been studied in the literature on ultrawideband (UWB) communications. The authors emphasis is to assess the capabilities of PC compared to time reversal (TR) prefilters over indoor UWB channels regarding multipath suppression, channel hardening, noise sensitivity and high-speed data transmission. Experiments were carried out for PC and TR prefilters in both line-of-sight (LOS) and non-LOS (NLOS) environments. The multipath compression effectiveness is characterised by computing the root-mean-square delay spread and peak-to-average power ratio for actual measured channels and for the IEEE 802.15.4(a) UWB model. The authors study suggests PC outperforms TR considerably in mitigating the multipath channel dispersion. Bit-error-rate (BER) curves have been simulated for data rates in the range of 125-4000 Mbps based on the measured channel responses. The BER simulations suggest that while the TR performance is prohibitively saturated by its residual intersymbol interference for data rates of 500 Mbps and above (especially in NLOS), PC can be used for high-speed data transmissions as fast as 2 Gbps in both LOS and NLOS environments.

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Section: Performance Characterisation Metricsmentioning

confidence: 99%

“…H Sys (f ) df 2 (11) Using (8)-(11), we have the following expressions for the peak-to-average power ratios of TR and PC…”

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confidence: 99%

Phase compensation communication technique against time reversal for ultra‐wideband channels

Dezfooliyan¹,

Weiner²

2013

IET Communications

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“…TR has two main characteristics, the temporal focusing and the spatial focusing; these are very beneficial to the UWB system [17,18]. More recently, TR has also been studied for broadband radio communications, especially for UWB radio [13].…”

Section: Time Reversalmentioning

confidence: 99%

Advanced Train Positioning/Communication System

Elbahhar¹,

Heddebaut²

2018

Modern Railway Engineering

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In the past, in order to ensure train positioning as well as ground-to-train information exchange, railways have adopted various technologies. Over time, each new generation of equipment enriched the global information exchange but, as a consequence, necessitated higher data rate transfers. For the positioning functionality, the existing localisation systems are still limited, since most of them require an infrastructure installation with constraints such as laying equipment between the rails or having high database maintenance requirements and computational costs. Moreover, some of them accumulate errors (odometers and inertial sensors) or offer limited coverage in shadowed areas (GNSS, etc.). Currently, in railway applications, a widely used localization system is based on proprioceptive sensors embarked in the train. This on-board system is coupled to the use of balises located at ground between the rails. These balises are kilometre markers. They are used to compensate for the drift of the localization information computed using the proprioceptive sensors alone, when the train moves. The balises provide absolute localization information whenever the train passes over them. They can also provide spot communication during the short period of time when trains are passing over them. In the first part of this chapter, techniques for achieving train positioning and data exchanges between trains and infrastructure are introduced. In the second part, a new balise is proposed. Particular attention is paid to the contribution of this new solution in terms of localization error and communication performances.

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“…where  represents the convolution operation and n(t) is the Gaussian noise. From Equation (2), we deduce the equivalent impulse response heq(t) which corresponds to the autocorrelation function of the channel [17]: The autocorrelation function is used to evaluate two main characteristics associated to time reversal, i.e., the temporal focusing and the spatial focusing. These characteristics are very beneficial to the UWB system [17,18].…”

Section: Principle and Characteristics Of Time Reversal (Tr) Techniquementioning

confidence: 99%

“…From Equation (2), we deduce the equivalent impulse response heq(t) which corresponds to the autocorrelation function of the channel [17]: The autocorrelation function is used to evaluate two main characteristics associated to time reversal, i.e., the temporal focusing and the spatial focusing. These characteristics are very beneficial to the UWB system [17,18]. To study the temporal focusing, we evaluate the Focusing Gain (FG), which is defined as the ratio of the strongest peak in TR received to the strongest peak received by a conventional UWB system [19].…”

Section: Principle and Characteristics Of Time Reversal (Tr) Techniquementioning

confidence: 99%

Time-Reversal UWB Positioning Beacon for Railway Application

Fall¹,

Elbahhar²,

Heddebaut³

et al. 2013

WET

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This paper studies a new positioning beacon for railway transport using Ultra Wideband (UWB) radio and Time Reversal (TR) techniques. UWB radio has the potential to offer a good level of performance in terms of localization accuracy. Time Reversal channel pre-filtering facilitates signal detection and also helps increasing the received energy in the targeted area. In this paper, we evaluate the characteristics of TR technique in terms of temporal focusing. The theoretical and simulation results for Power Delay Profile, equivalent channel model and focusing gain of TR-UWB are given. We analyze the contribution of Time Reversal associated with UWB technology to enhance the localization resolution. The IEEE 802.15.3achannel models are used to evaluate the performance of this system. In terms of localization error, the theoretical and simulation results show that TR-UWB technique delivers improved performance over the UWB localization approach.

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Channel characterization of time reversal UWB communication systems

Cited by 12 publications

References 13 publications

Phase compensation communication technique against time reversal for ultra‐wideband channels

Phase compensation communication technique against time reversal for ultra‐wideband channels

Advanced Train Positioning/Communication System

Time-Reversal UWB Positioning Beacon for Railway Application

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