Group-Based CSS Modulation: A Novel Enhancement to LoRa Physical Layer

Yu, Quantao; Wang, Hua; Lu, Zhiping; An, Shixiang

doi:10.1109/lwc.2022.3140860

Cited by 17 publications

(9 citation statements)

References 13 publications

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“…This is due to the orthogonal coexistence between the chirp and the OTFS subcarriers in delay-Doppler domain as explained in Section III. Finally, we compare the communication rates at the receiver for OFDM, OTFS, and, FMCW which respectively given as [31], [32]…”

Section: Communication Performancementioning

confidence: 99%

A Novel OTFS-Chirp Waveform for Low-Complexity Multi-User Joint Sensing and Communication

Zegrar,

Boudjelal,

Arslan

2024

Preprint

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Section: Communication Performancementioning

confidence: 99%

A Novel OTFS-Chirp Waveform for Low-Complexity Multi-User Joint Sensing and Communication

Zegrar,

Boudjelal,

Arslan

2024

Preprint

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“…GCSS has been proposed in [53] and is somewhat similar to ePSK-CSS in a sense that the available FSs are divided…”

Section: Group-based Css (Gcss)mentioning

confidence: 99%

“…2) Detection: The authors in [53] only proposed a coherent detector for GCSS that is shown in Fig. 36.…”

Section: ) Transmissionmentioning

confidence: 99%

A Survey on Chirp Spread Spectrum-based Waveform Design for IoT

Azim¹,

Bazzi²,

Shubair³

et al. 2022

Preprint

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<p>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/energy efficiencies, and can target multitude of Internet-of-Thing (IoT) applications. However, one of the limiting factors for LoRa is the low bit rate. Little to no effort has been made in order to improve the achievable rate of LoRa, until recently, when a number of CSS-based PHY layer LoRa alternative are proposed for LPWANs. In this survey, for the first time, we present a comprehensive waveform design of these CSS-based schemes that have been proposed between 2019 to 2022. In total, fifteen alternatives to LoRa are compared. Other survey articles related to LoRa mostly tackle different issues, such as LoRa networking, LoRa deployment in massive IoT networks, and LoRa architectures, etc. This survey, on the other hand, comprehensively elucidates the waveform design of LoRa alternatives. The CSS schemes studied in this survey are divided into single chirp, multiple chirp, and index modulation based on the multiplexing pattern of the chirps. Complete transceiver architecture of these CSS schemes is studied, and performance is evaluated in terms of energy efficiency (EE), spectral efficiency (SE), bit-error rate (BER) performance in additive white Gaussian noise, BER in the presence of phase and frequency offsets. It has been observed that the EE, SE and robustness against the offsets is primarily linked to transmit symbol frame structure. The public versions of the MATLAB codes for the CSS schemes studied in this survey shall be provided to promote reproducible research.</p>

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“…Several recent studies have proposed different variants of LoRa modulation, which are more energy and/or spectral efficient than LoRa. Some interesting alternatives are [2], [3], [4], [5], [6], [7], [8]. In [2], the authors propose phase-shift keying-LoRa (PSK-LoRa), in which the additional bits are encoded in the phase shifts (PSs) of the orthogonal chirp signal.…”

mentioning

confidence: 99%

“…SSK-ICS-LoRa performs better than LoRa, SSK-LoRa and ICS-LoRa in terms of EE while transmitting higher number of bits relative to the above-mentioned counterparts. Recently, in [7], the authors have proposed group-based CSS (GCSS) modulation, which is configurable via the so-called group number (GN), and G is introduced with the intention of achieving a trade-off between EE and SE. It is shown that by increasing G, the EE decreases but the SE increases and vice versa.…”

mentioning

confidence: 99%

Dual-Mode Chirp Spread Spectrum Modulation

Azim¹,

Bazzi²,

Shubair³

et al. 2022

Preprint

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In this letter, we propose novel dual-mode chirp spread spectrum (DM-CSS) modulation for lowpower wide-area networks for Internet-of-Things applications. DM-CSS is capable of transmitting higher number of bits relative to other counterparts, such as Long Range (LoRa) modulation. Considering the same symbol period, the number of transmitted bits in DM-CSS are augmented by: (i) simultaneously multiplexing even and odd chirp signals; (ii) using phase shifts of 0 and π radians for both even and odd chirp signals; and (iii) using either up-chirp or down-chirp signal. Relative to LoRa, the transmitted bit rate increases by up to 116.66% for the same bandwidth and spreading factor. Moreover, we present a non-coherent receiver architecture for DM-CSS. Simulation results reveal that DM-CSS is not only more spectral efficient but also more energy efficient than most classical counterparts. It is also demonstrated that DM-CSS is robust to phase and frequency offsets.

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Group-Based CSS Modulation: A Novel Enhancement to LoRa Physical Layer

Cited by 17 publications

References 13 publications

A Novel OTFS-Chirp Waveform for Low-Complexity Multi-User Joint Sensing and Communication

A Novel OTFS-Chirp Waveform for Low-Complexity Multi-User Joint Sensing and Communication

A Survey on Chirp Spread Spectrum-based Waveform Design for IoT

Dual-Mode Chirp Spread Spectrum Modulation

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