Abstract
In this paper, we propose and experimentally demonstrate a switching multiple input and multiple output (MIMO) system combining with adaptive orthogonal frequency division multiplexing (OFDM) modulation for high-speed indoor visible light communications. The adaptive OFDM modulation, which is realized by power and bit allocation on OFDM subchannels, is utilized to achieve the maximum channel capacity under a given target bit error rate (BER). Meanwhile, the MIMO mode switches between spatial multiplexing and transmit diversity adapting to the channel correlation, where the modulation order solved by adaptive OFDM modulation is chosen as the switching criterion. Experimental results validate data rates improvement over the pure spatial multiplexing and the pure transmit diversity system, where BERs are all below the 7% preforward error correction (pre-FEC) threshold of 3.8 × 10−3 in experiments.
Highlights
Light-emitting diode- (LED-) based visible light communication (VLC) has become a major candidate for future wireless communication
Signals are generated by an arbitrary function generator (AFG: Tektronix AFG3252C), which supplies the direct current (DC) offset to ensure the positivity of transmitted signals
We propose and experimentally demonstrate a switching multiple input and multiple output (MIMO) scheme combining with adaptive orthogonal frequency division multiplexing (OFDM) modulation for indoor VLC system
Summary
Light-emitting diode- (LED-) based visible light communication (VLC) has become a major candidate for future wireless communication. Through OFDM modulation, channel is decomposed into multiple frequency-flat channels and the intersymbol interference (ISI) can be eliminated, while MIMO scheme boosts the channel capacity and improves the reliability based on the simple idea of transmitting multiple data streams simultaneously on multiple LEDs. one major limitation on MIMO performance is the correlation of the MIMO VLC channel [4]. Been proposed in [13], where MIMO mode switches between spatial multiplexing and transmit diversity adapting to the channel correlation. In such a way, we can take advantages of both MIMO schemes.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
