Empirical evaluation of OFDM waveforms for VLC in the presence of LED nonlinearities

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference contributionScientificvertaisarvioitu

19 Lataukset (Pure)

Abstrakti

Visible Light Communications (VLC) rely on LED light sources to transmit information wirelessly, offering an alter-native air interface to contemporary mobile networks using Radio Frequency bands for wireless connectivity. Most commercial LEDs found in the market nowadays have been designed for illumination, showing a notable non-linear response when per-forming the Electrical-to-Optical (E/O) conversion, particularly when using deep Intensity Modulation (IM) indexes for increased useful radiated power. Several different OFDM-based waveforms, adapted to the unipolarity requirement that IM demands, have been proposed in the literature. However, the performance of most of these Optical OFDM waveforms is seriously affected by the non-linear magnitude distortion of the low-cost white LEDs, particularly when the Peak-to-Average Power Ratio (PAPR) is high. To tackle this issue, this paper analyzes the performance of Constant-Envelope (CE) OFDM, a waveform that modulates the phase of an Intermediate Frequency (IF) carrier with a real-valued OFDM signal before its E/O conversion. The Bit Error Rate of CE-OFDM is compared to the one of DC-biased Optical OFDM and passband OFDM using a software-defined VLC demonstrator. CE-OFDM allows the VLC system to work in energy-efficient regimes, thanks to its robustness to the non-linear magnitude distortion introduced by the LED.

AlkuperäiskieliEnglanti
Otsikko2021 IEEE 32nd Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2021
KustantajaIEEE
Sivut465-470
Sivumäärä6
ISBN (elektroninen)9781728175867
DOI - pysyväislinkit
TilaJulkaistu - 13 syysk. 2021
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaIEEE International Symposium on Personal, Indoor and Mobile Radio Communications - Helsinki, Suomi
Kesto: 13 syysk. 202116 syysk. 2021
Konferenssinumero: 32

Julkaisusarja

NimiIEEE International Symposium on Personal, Indoor and Mobile Radio Communications
ISSN (painettu)2166-9570
ISSN (elektroninen)2166-9589

Conference

ConferenceIEEE International Symposium on Personal, Indoor and Mobile Radio Communications
LyhennettäPIMRC
Maa/AlueSuomi
KaupunkiHelsinki
Ajanjakso13/09/202116/09/2021

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