Enhanced measurement of human activity using FMCW radar

Yoon, Hyunsoo; Seul, Jongwun; Kim, Sumin; Shin, Hyun-Chool

doi:10.1109/itc-cscc55581.2022.9894881

Cited by 1 publication

(4 citation statements)

References 7 publications

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“…Although the overlap technique increases the spectral efficiency, it may cause more inter-symbol interference, leading to serious degradation of BER [21][22][23]25,26]. Therefore, a reasonable tradeoff between spectral efficiency and ISI is required.…”

Section: Inter-symbol Interference Due To Overlapmentioning

confidence: 99%

“…Therefore, a reasonable tradeoff between spectral efficiency and ISI is required. T. Yoon et al [23] proposed a theoretical expression for the BER of a CSS overlap system to help choose the optimal number of overlaps. The authors in [21] also proposed a BER expression for a DM CSS system with a finite number of overlaps and investigated the conditions under which the ISI can be minimized while approaching the Nyquist rate.…”

Section: Inter-symbol Interference Due To Overlapmentioning

confidence: 99%

“…DM CSS allows chirps to overlap in the time domain and uses a simple matched filter for detection [21]. Even though the overlap approach improves spectral efficiency, it may result in increased inter-symbol interference, which severely degrades BER [21][22][23]. As a consequence, a proper trade-off between the spectral efficiency and ISI is necessary.…”

Section: Introductionmentioning

confidence: 99%

“…A variety of techniques have been proposed to mitigate ISI, including equalization, which attempts to cancel the effects of the channel on the transmitted symbols; or the use of pulse shaping filters, which shape the transmitted waveforms to reduce their duration and minimize overlap. T. Yoon et al [23] provided a theoretical expression for the BER of an overlapping CSS system to further guide the selection of the optimal number of overlaps. In [21], the authors also proposed a BER expression for an overlapping DM CSS system with a finite number of overlaps and investigated in which conditions the ISI can be minimized while nearing the Nyquist rate.…”

Section: Introductionmentioning

confidence: 99%

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M-Ary Direct Modulation Chirp Spread Spectrum for Spectrally Efficient Communications

et al. 2023

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Spread spectrum techniques, such as the Chirp Spread Spectrum (CSS) used by LoRa technology, are important for machine-to-machine communication in the context of the Internet of Things. They offer high processing gain, reliable communication over long ranges, robustness to interference and noise in harsh environments, etc. However, these features are compromised by their poor spectral efficiency, resulting in a very low data transmission rate. This paper deals with a spectrally efficient variant of CSS. The system uses M-ary phase keying to modulate the data and exploits CSS’s properties to transmit the modulated symbols as overlapping chirps. The overlapping of chirp signals may affect the system performance due to inter-symbol interference. Therefore, we analyse the relationship between the number of overlaps and the effect of inter-symbol interference (ISI), and we also determine the BER expression as a function of the number of overlaps. Finally, we derive the optimal number of overlapping symbols that corresponds to the minimum error probability.

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