Study Project Abstract
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Study Project: Radio-over-Fiber Abstract: Wi-Fi over fiber systems face challenges due to fiber transmission and other non-linear effects in fiber. Radio-over- fiber (RoF) technology is wireless with optical backhaul. The encoded data from Optical Line Terminal (OLT) is sent through the fiber to the Optical Network Unit (ONU). The data is accessed at ONUs to the access points. The QAM encoded data is passed through OFDM modulator and sent to the ONU. The ONU is fixed to operate at certain wavelength. An ad-hoc network of ONU’s communicating with each other is suggested to share ONU-to-OLT resources. OFDM scheme is used since it is resistant to multipath fading. QAM data is sent to the OFDM modulator where cyclic prefix is added and transmitted over the fiber. The data accessed at ONU’s will be a ISM band centered around 5 GHz. This band can accommodate more channels than 2.4 GHz band. As per allocation standards for Wi-Fi, a spacing of 20MHz can accommodate up to 32 channels. Fiber length will be optimized based on the distances in the network. The test bed is designed on OptiSystem 11 platform. The QAM constellation at output is analyzed after transmission impairment compensation and realizable Bit Error Rate (BER) will be obtained. Optical Line Terminal OLT ONU1 ONU2 ONU3 ONU4 ONU5
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- 1. Study Project: Radio-over-Fiber Abstract: Wi-Fi over fiber systems face challenges due to fiber transmission and other non- linear effects in fiber. Radio-over-fiber (RoF) technology is wireless with optical backhaul. The encoded data from Optical Line Terminal (OLT) is sent through the fiber to the Optical Network Unit (ONU). The data is accessed at ONUs to the access points. The QAM encoded data is passed through OFDM modulator and sent to the ONU. The ONU is fixed to operate at certain wavelength. An ad-hoc network of ONUs communicating with each other is suggested to share ONU-to-OLT resources. OFDM scheme is used since it is resistant to multipath fading. QAM data is sent to the OFDM modulator where cyclic prefix is added and transmitted over the fiber. The data accessed at ONUs will be a ISM band centered around 5 GHz. This band can accommodate more channels than 2.4 GHz band. As per allocation standards for Wi-Fi, a spacing of 20MHz can accommodate up to 32 channels. Fiber length will be optimized based on the distances in the network. The test bed is designed on OptiSystem 11 platform. The QAM constellation at output is analyzed after transmission impairment compensation and realizable Bit Error Rate (BER) will be obtained. Figure: Architecture of system and ring topology of Wi-Fi routers. Time duration required:One semester (4 months, 20 days). Optical Line Terminal OLT ONU1 ONU2 ONU3 ONU4 ONU5
- 2. References: 1. Abhishek Dixit,Bart Lannoo,Didier Colle,Mario Pickavet,etal,Energy Efficient Dynamic Bandwidth Allocation for Ethernet Passive Optical Networks, 2012 IEEE International Conference on Advanced Networks and Telecommunication systems(ANTS). 2. Hee-Jung Byun, Ji-Myung Nho and Jong-Tae Lim, Dynamic bandwidth allocation algorithm in ethernet passive optical networks, Electronics letters,26th June 2003,Vol 39,No.13. 3. Leonid Kazovsky , Kadir Melih Albeyoglu, Anujit Shastri ,Hybrid Optical Wireless Access Networks,Proceedings of IEEE,Vol 100,No.5,May 2012. 4. X.Q.Jin,J.M.Tang,First Experimental Demonstrations of Real time Optical OFDMA PONs with Adaptive Dynamic Bandwidth Allocation and Colorless ONUs,IEEE proceedings ,Future network and mobile summit,2012 ,pages 1-8, july 4-6, 2012. 5. R.P.Khare, Fiber Optics and Optoelectronics,Oxford University Press. 6. Hans-Jorg Thiele, Marcus Nebeling, Coarse Wavelength Divison Multiplexing technologies and applications. 7. G.P Agarwal,Fiber Optic Communications,New York. 8. Biswanath Mukherjee,Optical WDM networks, Springer, New York. 9. Rajiv Ramaswami, Kumar N.Sivaranjan, Optical networks,a practical perspective,2nd edition.
