Spread spectrum ≈ Spread spectrum
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Impact of LoRa Imperfect Orthogonality: Analysis of Link-Level Performance Open
In this letter, we focus on the evaluation of link-level performance of LoRa technology, in the usual network scenario with a central gateway and high-density deployment of end-devices. LoRa technology achieves wide coverage areas, low pow…
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Performance of a low-power wide-area network based on LoRa technology: Doppler robustness, scalability, and coverage Open
The article provides an analysis and reports experimental validation of the various performance metrics of the LoRa low-power wide-area network technology. The LoRa modulation is based on chirp spread spectrum, which enables use of low-qua…
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Range and coexistence analysis of long range unlicensed communication Open
A broad range of emerging applications require very low power, very long range yet low throughput communication. Different standards are being proposed to meet these novel requirements. In this paper, the technical differences between a wi…
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Sequence Set Design With Good Correlation Properties Via Majorization-Minimization Open
Sets of sequences with good correlation properties are desired in many active\nsensing and communication systems, e.g., multiple-input-multiple-output (MIMO)\nradar systems and code-division multiple-access (CDMA) cellular systems. In\nthi…
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Power and spreading factor control in low power wide area networks Open
Low power wide area networks are gaining interest to connect thousands of nodes to the internet of things. However, because the link budget is huge, nodes suffer from a near-far effect. Nodes far from the base station cannot send to the ba…
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Lora Digital Receiver Analysis and Implementation Open
Low power wide area network technologies (LPWANs) are attracting attention because they fulfill the need for long range low power communication for the Internet of Things. LoRa is one of the proprietary LPWAN physical layer (PHY) technolog…
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Secure Routing in Multihop Wireless Ad-Hoc Networks With Decode-and-Forward Relaying Open
In this paper, we study the problem of secure routing in a multihop wireless
\nad-hoc network in the presence of randomly distributed eavesdroppers.
\nSpecifically, the locations of the eavesdroppers are modeled as a homogeneous
\nPoisson …
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Exploring Multi-Hop LoRa for Green Smart Cities Open
With the growing popularity of Internet-of-Things (IoT)-based smart city applications, various long-range and low-power wireless connectivity solutions are under rigorous research. LoRa is one such solution that works in the sub-GHz unlice…
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Tradeoff of Code Estimation Error Rate and Terminal Gain in SCER Attack Open
The current research on the global navigation satellite system (GNSS) has shifted to focus on providing secure and reliable services, rather than high-precision positioning services. Deception jamming has emerged as a major threat to GNSS …
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Analysis and Simulation of LoRaWAN LR-FHSS for Direct-to-Satellite Scenario Open
Long Range-Frequency Hopping Spread Spectrum (LR-FHSS) has been recently introduced into the LoRaWAN protocol specification to increase network capacity and collision robustness, and enable direct connectivity between machine devices and t…
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A Survey on Chirp Spread Spectrum-based Waveform Design for IoT Open
Long Range (LoRa) is one of the most promising and widespread chirp spread spectrum (CSS)-based physical (PHY) layer technique for low-power wide-area networks (LPWANs). Using different spreading factors, LoRa can attain different spectral…
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Hybrid Matched Filter Detection Spectrum Sensing Open
The radio frequency spectrum is getting more congested day by day due to the growth of wireless devices, applications, and the arrival of fifth generation (5G) mobile communications. This happens because the radio spectrum is a natural res…
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Time-coding spread-spectrum reconfigurable intelligent surface for secure wireless communication: theory and experiment Open
We present a time-coding reconfigurable intelligent surface (RIS) enabled spread-spectrum secure wireless communication system. The time-coding spread-spectrum RIS is realized by altering the RIS between the two states of a perfect electri…
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Above-90GHz Spectrum and Single-Carrier Waveform as Enablers for Efficient Tbit/s Wireless Communications Open
International audience
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On the LoRa Chirp Spread Spectrum Modulation: Signal Properties and Their Impact on Transmitter and Receiver Architectures Open
The LoRa modulation scheme is arousing a growing interest in the Internet of Things community as it is adopted by the emerging LoRaWAN technology. In this paper, we firstly analyse the baseband processing for the generation of LoRa signals…
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Detection of Signals in MC–CDMA Using a Novel Iterative Block Decision Feedback Equalizer Open
This paper presents a technique to mitigate multiple access interference (MAI) in multicarrier code division multiple access (MC-CDMA) wireless communications systems. Although under normal circumstances the MC-CDMA system can achieve high…
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Leveraging EM Side-Channel Information to Detect Rowhammer Attacks Open
The rowhammer bug belongs to software-induced hardware faults, and has been exploited to form a wide range of powerful rowhammer attacks. Yet, how to effectively detect such attacks remains a challenging problem. In this paper, we propose …
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Sub-THz Spectrum as Enabler for 6G Wireless Communications up to 1 Tbit/s Open
International audience
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Photonics based frequency hopping spread spectrum system for secure terahertz communications Open
Terahertz (THz) spectrum (100 GHz-10 THz) is considered the next frontier in the design of high-speed wireless communication systems. While the high-power THz sources have commercially become available, it increases the possibility of deve…
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Ultrasonic Communication Using Consumer Hardware Open
We have implemented a near-ultrasonic communication protocol in the 18.5-20 kHz band, which is inaudible to most humans, using commodity smartphone speakers and microphones to transmit and receive signals. The protocol described in this pa…
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DS/CDMA Multiuser Detection with Evolutionary Algorithms Open
This work analyses two heuristic algorithms based on the genetic evolution theory applied to direct sequence code division multiple access (DS/CDMA) communication systems. For different phases of an evolutionary algorithm new biological pr…
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Impact of foliage on LoRa 433MHz propagation in tropical environment Open
LoRa is being considered as one of the promising system for Low-Power-Wide-Area-Network (LPWAN) to support the growth of Internet of Things (IoT) applications. Designed to operate in the industrial, scientific and medical (ISM) bands, LoRa…
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FH-BOC: generalized low-ambiguity anti-interference spread spectrum modulation based on frequency-hopping binary offset carrier Open
Objective The paper aims to present a generalized modulation scheme that can improve the anti-interference performance of global navigation satellite systems (GNSS) and mitigate the ambiguity problem in BOC modulation. Summary background d…
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Folded Chirp-Rate Shift Keying Modulation for LEO Satellite IoT Open
In the low earth orbit (LEO) satellite Internet of Things (IoT), the IoT devices can be distributed in remote areas (e.g., desert, ocean, and forest) for some special applications, where they are unable to have direct terrestrial network a…
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Blind Estimation of Spreading Sequence and Data Bits in Direct-Sequence Spread Spectrum Communication Systems Open
At the transmitter of a Direct Sequence Spread Spectrum (DSSS) communication system, data bits are spread using a spreading sequence. To demodulate the transmitted data bits, the received signal should be de-spread using the same spreading…
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M-ary Cyclic Shift Keying Spread Spectrum Underwater Acoustic Communications Based on Virtual Time-Reversal Mirror Open
Underwater acoustic communications are challenging because channels are complex, and acoustic waves when propagating in the ocean are subjected to a variety of interferences, such as noise, reflections, scattering and so on. Spread spectru…
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Dynamic Spectrum Access Networks With Heterogeneous Users: How to Price the Spectrum? Open
In a pricing-based spectrum trading market, an interesting issue is to study how secondary users make their selections in a rational manner when there are available spectrum of different qualities in the market. In this case, primary syste…
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Spread-Spectrum Techniques for Bio-Friendly Underwater Acoustic Communications Open
This paper investigates techniques to mitigate the impact of acoustic communication signals on marine life, by minimizing source level and designing waveforms with characteristics proven to reduce animal discomfort in bioacoustics studies.…
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Frequency-Domain Oversampling for Cognitive CDMA Systems: Enabling Robust and Massive Multiple Access for Internet of Things Open
Toward the era of mobile internet and Internet of Things (IoT), numerous sensors and devices are being introduced and interconnected. To support such amount of data traffic, traditional wireless communication technologies are facing challe…
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New Satellite Random Access Preamble Design Based on Pruned DFT-Spread FBMC Open
<p>Next generation satellite payload technology is expected to provide digital processing capabilities. This will pave the way to regard satellites as flying base stations. However, the initial access procedure must be improved. In t…