Revisiting the So-Called Constructive Interference in Concurrent Transmission

Liao, Chun-Hao; Katsumata, Yuki; Morikawa, Hiroyuki

doi:10.1109/lcn.2016.56

Cited by 22 publications

(23 citation statements)

References 22 publications

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“…When two packets arrive at a receiver approximately at the same time, whether the setting is going in favor of capture-effect or not, depends on various possible situations. To get a decent idea, we first exhaustively list out all these situations based on the constraints for time-capture and power-capture [28], [29]. Based on the time of arrival of the inter-and intra-group packets at the receiver, seven independent situations are possible as detailed below.…”

Section: Study Based On Controlled Local Experimentsmentioning

confidence: 99%

Fine-Grained Frequencies Meet Synchronous Transmission

Debadarshini¹,

Saha²

2021

Preprint

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<div>Fine-grained frequencies have been used in several recent works to enhance network throughput as well as combat Cross Technology Interference (CTI) issues in licence free ISM bands. We observe that synchronous communication based strategies, due to the scope of inter-frequency capture-effect, are inherently more capable of supporting in-parallel communication over multiple channels even when the Center Frequency Distance (CFD) of the channels are very low (<5 MHz). In this work, we pursue an in-depth study of how fine-grained frequencies can be used in conjunction with synchronous communication to extract the maximum benefit from a very narrow band of available frequencies (e.g., 2- 5 MHz) for in-parallel intra-group communication. In this direction, we propose a simple and efficient group formation strategy to automatically define groups in a given WSN/IoT network to boost up in-parallel intra-group communication efficiency. Through extensive experimental evaluations in existing WSN/IoT testbeds, we show that in-parallel one-to-all dissemination in the groups formed through the proposed strategy can execute with upto 73% higher reliability while consuming upto 41% lower energy as compared to the same running among the groups formed through naive strategy with only 4 consecutive frequencies separated by 1 MHz and upto 20 groups.</div>

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Section: Study Based On Controlled Local Experimentsmentioning

confidence: 99%

Fine-Grained Frequencies Meet Synchronous Transmission

Debadarshini¹,

Saha²

2021

Preprint

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“…Nodes that receive the frame repeat it while synchronising their transmissions down to 0.5 µs. Such synchronisation allows nodes to correctly decode concurrently transmitted frames with high probability due to a variety of modulation-specific mechanisms that are commonly misinterpreted as constructive interference [55,94]. The process repeats until it is assumed to have flooded the entire network.…”

Section: Store-and-forward Packet Switchingmentioning

confidence: 99%

“…Doing the same thing with two radios does not double the amplitude of the transmitted electromagnetic wave, since phenomena outside the control of any single transmitter obscure the resulting signal. Specifically, carrier frequency offsets between transmitters induce beatings in the resulting signal [55], while signal-to-noise ratios vary wildly with the receiving radio's position due to the location dependency of the signals' phase offset [94]. LED-based signals are far less susceptible to these phenomena, because LEDs are incoherent emitters: the coherence time of the waves that make up LED light, i.e.…”

Section: Optical Wireless Communicationmentioning

confidence: 99%

“…Section 2.1) works in spite of interference between concurrently transmitted signals. Such interference can be dealt with in several ways: Chaos [49] leverages the FM capture effect; Glossy [33] benefits from 15.4's direct sequence spread spectrum technique [55]; the system in [56] profits from energy spreading of interfering LoRa symbols by inserting small time offsets. Zero-Wire introduces a new approach: it exploits the interference characteristics of intensity modulation by incoherent transmitters to eliminate store-and-forward packet switching, the implications of which are best observed in contrast with Low-Power Wireless Bus (LWB) [32].…”

Section: Synchronous Transmissionmentioning

confidence: 99%

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Zero-wire

Oostvogels

Yang

Michiels

et al. 2020

Proceedings of the 18th Conference on Embedded Networked Sensor Systems

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The performance dichotomy between wired and wireless networks for the Internet of Things primarily arises from the inherent complexity and inefficiency of networking abstractions such as routing, medium access control and store-and-forward packet switching. This paper aims to enable a new class of latency-sensitive applications by breaking all three of these abstractions to deliver a performance envelope that resembles that of a wired bus in terms of deterministic latency and throughput. The essence of this approach is a novel networking paradigm for optical wireless communication, referred to as a symbol-synchronous bus, wherein a mesh of nodes concurrently transmit LED-based signals. This paper realises the paradigm within a platform called Zero-Wire and evaluates it on a 25-node testbed under laboratory conditions. Key end-to-end performance measurements on this physical prototype include 19 kbps of contention-agnostic goodput, interface-level latency under 1 ms for two-byte frames across four hops, jitter on the order of 10s of µs, and a base reliability of 99%. These first results indicate a bright future for the under-explored area of optical wireless mesh networks in delivering ubiquitous connectivity through a simple and low-cost physical layer.

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“…Understanding under what circumstances a node can successfully receive a packet in the presence of collisions motivated a wealth of research [73,128]. Current knowledge indicates that three effects play an important role, often in combination, depending on the receiver implementation and on the properties of the incoming signals: capture effect [69], message-in-message effect [81], and constructive interference [36].…”

Section: Receiving In the Presence Of Packet Collisionsmentioning

confidence: 99%

Synchronous Transmissions in Low-Power Wireless: A Survey of Communication Protocols and Network Services

Zimmerling,

Mottola,

Santini

2020

Preprint

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Low-power wireless communication is a central building block of Cyber-physical Systems and the Internet of Things. Conventional low-power wireless protocols make avoiding packet collisions a cornerstone design choice. The concept of synchronous transmissions challenges this view. As collisions are not necessarily destructive, under specific circumstances, commodity low-power wireless radios are often able to receive useful information even in the presence of superimposed signals from different transmitters. We survey the growing number of protocols that exploit synchronous transmissions for higher robustness and efficiency as well as unprecedented functionality and versatility compared to conventional designs. The illustration of protocols based on synchronous transmissions is cast in a conceptional framework we establish, with the goal of highlighting differences and similarities among the proposed solutions. We conclude the paper with a discussion on open research questions in this field.

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Revisiting the So-Called Constructive Interference in Concurrent Transmission

Cited by 22 publications

References 22 publications

Fine-Grained Frequencies Meet Synchronous Transmission

Fine-Grained Frequencies Meet Synchronous Transmission

Zero-wire

Synchronous Transmissions in Low-Power Wireless: A Survey of Communication Protocols and Network Services

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