Playing with Fire: Exploring Concurrent Transmissions in Ultra-wideband Radios

Vecchia, Davide; Corbalán, Pablo; Istomin, Timofei; Picco, Gian Pietro

doi:10.1109/sahcn.2019.8824929

Cited by 22 publications

(20 citation statements)

References 10 publications

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“…However, the potential for collisions is significantly reduced with our technique, given that a single concurrent ranging exchange retrieves the information accrued via N conventional ones. Further, communicating the schedule could itself exploit concurrent transmissions [31,38,57], opening the intriguing possibility of merging scheduling and ranging into a single concurrent exchange abating at once the overhead of both procedures.…”

Section: Discussionmentioning

confidence: 99%

“…This yields a (mean) pulse repetition frequency (PRF) of 16 MHz or 64 MHz. Preamble codes and PRFs can be exploited to configure non-interfering links within the same RF channel [57].…”

Section: Ultra-wideband In the Ieee 802154 Phy Layermentioning

confidence: 99%

“…The PRR of the experiment is interestingly high, considering that in narrowband technologies increasing the number of concurrent transmitters sending different packets typically decreases reliability due to the nature of the capture effect [27,34]. In general, the behavior of concurrent transmissions in UWB is slightly different-and richer-than in narrowband; the interested reader can find a more exhaustive treatment in Reference [57]. In this specific case, the reason for the high PRR we observed is the closer distance to the initiator of R 1 w.r.t.…”

Section: What About More Responders?mentioning

confidence: 99%

“…In Reference [57], we ascertained empirically the conditions for exploiting UWB concurrent transmissions for reliable communication, exploring extensively the radio configuration space. The findings serve as a foundation for adapting the knowledge and systems in narrowband towards UWB and reaping similar benefits, as already exemplified by Reference [38].…”

Section: Concurrent Transmissions For Low-power Wireless Communicationmentioning

confidence: 99%

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Ultra-wideband Concurrent Ranging

Corbalán

Picco

2020

ACM Trans. Sen. Netw.

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We propose a novel concurrent ranging technique for distance estimation with ultra-wideband (UWB) radios. Conventional schemes assume that the necessary packet exchanges occur in isolation to avoid collisions. Concurrent ranging relies on the overlapping of replies from nearby responders to the same ranging request issued by an initiator node. As UWB transmissions rely on short pulses, the individual times of arrival can be discriminated by examining the channel impulse response (CIR) of the initiator transceiver. By ranging against N responders with a single, concurrent exchange, our technique drastically abates network overhead, enabling higher ranging frequency with lower latency and energy consumption w.r.t. conventional schemes. Concurrent ranging can be implemented with a strawman approach requiring minimal changes to standard schemes. Nevertheless, we empirically show that this limits the attainable accuracy, reliability, and therefore applicability. We identify the main challenges in realizing concurrent ranging without dedicated hardware and tackle them by contributing several techniques, used in synergy in our prototype based on the popular DW1000 transceiver. Our evaluation, with static targets and a mobile robot, confirms that concurrent ranging reliably achieves decimeter-level distance and position accuracy, comparable to conventional schemes but at a fraction of the network and energy cost.

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Section: Discussionmentioning

confidence: 99%

“…This yields a (mean) pulse repetition frequency (PRF) of 16 MHz or 64 MHz. Preamble codes and PRFs can be exploited to configure non-interfering links within the same RF channel [57].…”

Section: Ultra-wideband In the Ieee 802154 Phy Layermentioning

confidence: 99%

Section: What About More Responders?mentioning

confidence: 99%

Section: Concurrent Transmissions For Low-power Wireless Communicationmentioning

confidence: 99%

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Ultra-wideband Concurrent Ranging

Corbalán

Picco

2020

ACM Trans. Sen. Netw.

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“…Responding (quasi-)simultaneously by multiple agents to the anchors can reduce the number of message exchanges if the agent signals are orthogonal either in time or frequency. When the agents send UWB signals to anchors, each anchor can extract the superpositioned responses in one channel impulse response (CIR) estimate and further obtain all the arrival time-stamps from the agents [35,36]. Since the order of the responses is determined in advance, we only need to calculate the TDOA based on the time-stamps of the received peaks.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Single-Anchor Localization Method Using Ultra-Wide Bandwidth Systems

2019

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Ultra-wideband technology has the merits of high temporal resolution and stability, and it has been widely used for high-accuracy localization and tracking. However, most ultra-wideband localization systems need multiple anchors for trilateration, which results in high system cost, large messages overhead, and insufficient extraction of information. In this paper, we propose a single-anchor localization (SAL) mehtod that achieves high-accuracy multi-agent localization with high efficiency. In the proposed method, the anchor broadcasts the first two messages and then each agent responds one message to the anchor (quasi-)simultaneously. Based on the received message with superpositioned agent responses, the time-of-flight and angle-of-arrival information from all agents to the anchor can be extracted altogether. We implement the localization system in two indoor environments, and show that the proposed method can achieve decimeter-level accuracy for multiple agents using three messages. Our method provides design guidelines for high-accuracy and high-efficiency multi-agent localization systems.

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