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Performance of LoRa-based Schemes and Quadrature Chirp Index Modulation
| Publication type | Journal paper |
|---|---|
| Year of publication | 2022 |
| Authors | Giuseppe Baruffa and Luca Rugini |
| Title | Performance of LoRa-based Schemes and Quadrature Chirp Index Modulation |
| Journal title | IEEE Internet of Things Journal |
| Volume | 9 |
| Issue | 10 |
| Pages | 7759–7772 |
| Editor | |
| Publisher | IEEE |
| Date | May 2022 |
| Place | |
| ISSN number | 2327-4662 |
| ISBN number | |
| Key words | Chirp spread spectrum, error probability, index modulation, LoRa, quadrature multiplexing |
| Abstract | This paper proposes new approximations for the bit error probability of several LoRa-based schemes, such as phase-shift keying (PSK) LoRa, in-phase and quadrature (IQ) chirp spread spectrum (CSS), discrete chirp rate keying (DCRK) CSS, and CSS with index modulation (IM). We include a new scheme that combines IQ, CSS, and IM, denoted as IQCIM. Our analysis, which assumes coherent detection in additive white Gaussian noise, compares the LoRa-based schemes also in terms of spectral efficiency, computational complexity, and peak-to-average power ratio. Noncoherent detection of CSS with IM is analyzed as well. Our performance analysis shows that the proposed IQCIM produces a significant increase of spectral efficiency compared to LoRa with similar complexity, at an energy cost of approximately 0.9 dB. When compared to the other LoRa-based schemes, for a fixed decoding latency, the spectral efficiency of IQCIM is still the largest, with reduced computational cost per transmitted bit. In this context, we also propose a maximum-likelihood coherent detector for PSK-LoRa and a novel noncoherent detector for IQCSS. |
| URL | https://ieeexplore.ieee.org/document/9542955 |
| DOI | http://dx.doi.org/10.1109/JIOT.2021.3114096 |
| Other information | |
| Paper |