Optimal Symbol Set Design for Generalized Spatial Modulations in MIMO VLC Systems

This paper investigates optimal symbol set selection for the generalized spatial modulation (GSM) in visible light communication (VLC) systems. Realizing that the optimal search involves a highly complex combinatorial problem, a symbol set generation tree is proposed. The tree allows assessment of the system performance at each node and can be terminated early to obtain near-optimal solutions with reduced complexity. It is observed that the proposed optimal symbol search provides performance improvement of many dBs over results obtained with averaged random sets. The benefit of the optimized symbol set design is found to increase with increasing number of pulse amplitude modulation levels. Our contributions also include integration of possible rotations of the array in the mathematical model, and the demonstration of the results to be robust to channel changes due to rotations and shifting of the array in the image plane. Finally, the results are validated through hardware experimental results.

[1]  Ananthanarayanan Chockalingam,et al.  Generalized Spatial Modulation in Indoor Wireless Visible Light Communication , 2014, 2015 IEEE Global Communications Conference (GLOBECOM).

[2]  D. O'Brien,et al.  A Gigabit/s Indoor Wireless Transmission Using MIMO-OFDM Visible-Light Communications , 2013, IEEE Photonics Technology Letters.

[3]  Shoji Kawahito,et al.  Optical Vehicle-to-Vehicle Communication System Using LED Transmitter and Camera Receiver , 2014, IEEE Photonics Journal.

[4]  Harald Haas,et al.  A comparison between DCO-OFDMA and synchronous one-dimensional OCDMA for optical wireless communications , 2013, 2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC).

[5]  Deva K. Borah,et al.  A Single-Input Multiple-Output Optical System for Mobile Communication: Modeling and Validation , 2014, IEEE Photonics Technology Letters.

[6]  Dominic C. O'Brien,et al.  Imaging-MIMO visible light communication system using μLEDs and integrated receiver , 2014, 2014 IEEE Globecom Workshops (GC Wkshps).

[7]  Elam Curry,et al.  Experimental multiuser mobile optical communication using compressive sensing , 2014, 2014 IEEE Globecom Workshops (GC Wkshps).

[8]  Harald Haas,et al.  Error Performance of Generalised Space Shift Keying for Indoor Visible Light Communications , 2013, IEEE Transactions on Communications.

[9]  Deva K. Borah,et al.  Optimal Symbol Set Selection in GSSK Visible Light Wireless Communication Systems , 2016, IEEE Photonics Technology Letters.

[10]  H. Haas,et al.  Demonstration of the Merit and Limitation of Generalised Space Shift Keying for Indoor Visible Light Communications , 2014, Journal of Lightwave Technology.

[11]  Harald Haas,et al.  Analysis of Optimal Placement of LED Arrays for Visible Light Communication , 2013, 2013 IEEE 77th Vehicular Technology Conference (VTC Spring).

[12]  Hsin-Mu Tsai,et al.  Characterizing link asymmetry in vehicle-to-vehicle Visible Light Communications , 2015, 2015 IEEE Vehicular Networking Conference (VNC).

[13]  Harald Haas,et al.  Performance Comparison of MIMO Techniques for Optical Wireless Communications in Indoor Environments , 2013, IEEE Transactions on Communications.

[14]  Harald Haas,et al.  Using a CMOS camera sensor for visible light communication , 2012, 2012 IEEE Globecom Workshops.

[15]  Zabih Ghassemlooy,et al.  Secured communications-zone multiple input multiple output visible light communications , 2014, 2014 IEEE Globecom Workshops (GC Wkshps).