Optical Spatial Modulation OFDM using Micro LEDs
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The document presents a detailed examination of optical spatial modulation OFDM using micro LEDs, covering key concepts such as OFDM, visible light communication, and multi-input multi-output systems. It highlights the advantages of micro LEDs over traditional LEDs, including faster flicker rates and higher quantum efficiencies, and discusses the achieved data rates and bit error rates associated with this technology. The findings indicate that osm-OFDM using micro LEDs can achieve a data rate of up to 5.5 Gb/s, outperforming other methods in terms of computational complexity.
Optical Spatial Modulation OFDM using Micro LEDs
- 1. Optical Spatial Modulation OFDM using Micro LEDs Presented by, Basil Jacob Roll no: 19 S7 ECE A VJCET
- 2. Contents OFDM Visible light Communication MIMO systems Optical Spatial Modulation Optical Spatial Multiplexing Micro LEDs OSM-OFDM using Micro LEDs Inference References 2
- 3. Modulation Vs Multiplexing 3 ₪ Modulation – Mapping of the information on changes in the carrier phase, frequency or amplitude or combination ₪ Multiplexing – Method of sharing a bandwidth with other independent data channels
- 4. Orthogonal Frequency Division Multiplexing OFDM is a combination of Modulation and Multiplexing Digital data encoded on multiple carrier frequencies Sub-carriers are orthogonal to each other Used in Asymmetric Digital Subscriber Line connections Need not be wireless 4
- 6. Analogy 6
- 7. OFDM - Block diagram 7 Source: http://ee.bradley.edu/projects
- 11. Visible Light Communication systems € Uses visible light between 400 and 800 THz (780–375 nm) € Fluorescent lamps ( 10 Kbit/s ) , LEDs ( 500 Mbit/s ) € Organic LEDs (OLED) as optical transceivers achieve 10 Mbit/s € Modulation transforms data into a series of light pulses € Frequency of light pulses is modulated & not the frequency of light 11
- 12. VLC - Motivation ∞ Visible light does not cause health problems ∞ Expensive patent-license is not needed ∞ No Electromagnetic Interference ∞ Safe to use in hospitals ∞ LEDs -the predominant choice - very short switching time 12
- 13. Multiple Input Multiple Output system 13 Source: https://en.wikipedia.org/wiki/File:MIMO.png
- 14. Optical Spatial Modulation 14 Source: article.sapub.org
- 15. OSM using LEDs 15 Source : Reference 4
- 16. Optical Spatial Multiplexing (OSMX) Each spatial channel carries independent information Increases the data rate of the system No additional cost on bandwidth or power Bit Error Rate is more Higher computational complexity Inter-antenna synchronization is required 16
- 17. Micro LEDs Diameter of about 12 µm Can flicker 1,000 times faster than commercial LEDs Enhanced quantum efficiencies for the same area 17 Source: www.element14.com
- 18. OSM OFDM using µLEDs 18 Source: Reference 1
- 19. OSM-OFDM using µLEDs 19 Source: Reference 1
- 20. OSM OFDM using µLEDs Vs OSMX OFDM 20
- 21. Achievable Data Rate 21 Source: Reference 1
- 22. Data Rate vs Semi-angle 22 Source : Reference 1
- 23. Bit Error Rate 23 Source : Reference 1
- 24. BER vs Semi-angle 24 Source : Reference 1
- 25. Computational Complexity 25 Source : Reference 1
- 26. Inference ₪ OSM-OFDM using µLEDs Better than OSMX-OFDM in terms of computational complexity Achieves data rate up to 5.5 Gb/s ₪ OSMX OFDM Data rates of up to 6 Gb/s are feasible ₪ BER depends largely on spatial separation between the transmitters(ds) and on the half- power semi-angle of the µLEDs (φ1/2) ₪ Optimum conditions :- larger spatial separation, a smaller half power semi-angle 26
- 27. References 1. M. Ijaz et al., "Optical spatial modulation OFDM using micro LEDs," 2014 48th Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, 2014, pp. 1734-1738. doi: 10.1109/ACSSC.2014.7094764 2. M. Ijaz et al., "Experimental proof-of-concept of optical spatial modulation OFDM using micro LEDs," 2015 IEEE International Conference on Communication Workshop (ICCW), London, 2015, pp. 1338-1343. doi: 10.1109/ICCW.2015.7247364 3. R. Mesleh, H. Elgala and H. Haas, "Optical Spatial Modulation," in IEEE/OSA Journal of Optical Communications and Networking, vol. 3, no. 3, pp. 234-244, March 2011. doi: 10.1364/JOCN.3.000234 4. R. Mesleh, R. Mehmood, H. Elgala and H. Haas, "Indoor MIMO Optical Wireless Communication Using Spatial Modulation," Communications (ICC), 2010 IEEE International Conference on, Cape Town, 2010, pp. 1-5. doi: 10.1109/ICC.2010.5502062 27
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