A radio access network testbed was built at IIT Madras to evaluate novel algorithms for broadband LTE cellular systems in realistic channel and interference settings. The end-to-end testbed with PHY and MAC layer functionalities, and built using software defined radio nodes, was a collaborative project between academia and industry. IIT Madras developed the hardware and LTE physical layer algorithms for both base station and mobile, while the MAC layers were brought in by the industrial partners. This talk will provide insights on how I architected, built and tested the entire testbed from scratch. We will cover the complete system development process that begins from understanding the LTE specifications, to development of block-level architecture of both baseband and RF hardware, to their design, layout and testing. We will also talk about the design of FPGA firmware and embedded LTE PHY layer algorithms that need to be integrated with the hardware and tested in real time. We conclude this talk by describing a channel emulator that was built using spin-off of the testbed hardware.
Rohit Budhiraja received his MS in electrical engineering from IIT Madras in 2004. From January 2004 to July 2011, he worked in two startups incubated at IIT Madras, and designed both base stations and user equipments for WiMAX- and LTE-based cellular systems. For these systems, he developed both hardware and software algorithms for physical layer processing. He worked on his Ph.D from August 2011 to July 2015 at IIT Madras, where he is currently working as a Project Advisor. His current research interests include hardware design for communication systems, cross-layer design between digital baseband and analog RF for wireless systems, and energy-efficient MIMO wireless communications. For more information, please see http://www.ee.iitm.ac.in/~ee11d021/