File(s) under permanent embargo
Non-Hermitian symmetry orthogonal frequency division multiplexing for multiple-input multiple-output visible light communications
journal contribution
posted on 2023-06-09, 19:22 authored by Chen Chen, Wen-De Zhong, Dehao WuMultiple-input multiple-output (MIMO) is a natural and effective way to increase the capacity of white light-emitting diode (LED) based visible light communication (VLC) systems. Orthogonal frequency division multiplexing (OFDM) using high-order modulation is another widely used technique in VLC systems. Due to the intensity modulation and direct detection nature of VLC systems, Hermitian symmetry is usually imposed in OFDM so as to obtain a real-valued signal. In this paper, we investigate a non-Hermitian symmetry OFDM (NHS-OFDM) scheme for MIMO-VLC systems. By transmitting the real and imaginary parts of a complex-valued OFDM signal via a pair of white LEDs, NHS-OFDM circumvents the constraint of Hermitian symmetry. We evaluate the performance of an indoor 2 × 2 MIMO-VLC system using conventional Hermitian symmetry-based OFDM (HS-OFDM) and NHS-OFDM, where both a non-imaging receiver and an imaging receiver are considered. Analytical results show that the system using NHS-OFDM achieves superior bit error rate (BER) performance to that using HS-OFDM, with lower or nearly the same computational complexity. The superior BER performance of NHS-OFDM-based MIMO-VLC is further verified by experiments. The experimental results demonstrate that, in a 400 Mb/s 2×2 MIMO-VLC system with an imaging receiver, NHS-OFDM improves the communication coverage by about 30% compared with conventional HS-OFDM for a target BER of 3.8×10 -3.
History
Publication status
- Published
File Version
- Published version
Journal
Journal of Optical Communications and NetworkingISSN
1943-0620Publisher
Institute of Electrical and Electronics EngineersExternal DOI
Issue
1Volume
9Page range
36-44Department affiliated with
- Engineering and Design Publications
Research groups affiliated with
- Advanced Communications, Mobile Technology and IoT (ACMI) Publications
Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2019-10-17First Compliant Deposit (FCD) Date
2019-10-14Usage metrics
Categories
No categories selectedLicence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC