Real-time software-defined single-carrier QAM MIMO visible light communication system

Peng Deng, Mohsen Kavehrad

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations


Visible light communications (VLC) based on light-emitting diodes (LEDs) combines lighting and data communications in applications of Internet-of-Things, ad-hoc networks and 5G networks, due to their high energy efficiency, spectral efficiency, security and reliability. We experimentally demonstrate a software-defined real-time multiple input multiple output (MIMO) visible light communication system using Single-Carrier Quadrature Amplitude Modulation (SC-QAM). The system uses two independent phosphorescent white LED transmitters with 10MHz bandwidth in the absence of blue filters, and two independent 150 MHz P-I-N photodiode optical receivers. Real-time MIMO signal processing is implemented by using the Field Programmable Gate Array (FPGA) based Universal Software Radio Peripheral (USRP) devices. Modulation formats and MIMO schemes are software-defined through USRP devices without changing the transceiver hardware. We measured and compared the constellation diagram, error vector magnitude (EVM) and bit error rate (BER) performance for single-carried M-QAM MIMO VLC using spatial diversity and spatial multiplexing. We demonstrate a real-time Single-Carrier 256-QAM 2×2 spatial multiplexing MIMO VLC link and achieve 1.81% averaged EVM, 2×10-5 BER and 12.3 b/s/Hz spectral efficiency over 2 m free space indoor transmission. The experimental results show that spatial diversity MIMO VLC improves error performance at the cost of spectral efficiency that spatial multiplexing should enhance.

Original languageEnglish (US)
Title of host publicationICNS 2016
Subtitle of host publicationSecuring an Integrated CNS System to Meet Future Challenges
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509021499
StatePublished - Jun 7 2016
Event16th Integrated Communications, Navigation, and Surveillance Conference, ICNS 2016 - Herndon, United States
Duration: Apr 19 2016Apr 21 2016


Other16th Integrated Communications, Navigation, and Surveillance Conference, ICNS 2016
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Instrumentation
  • Computer Networks and Communications
  • Information Systems and Management


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