Kedar Shirali

Lead the signal processing and systems team working on mmWave FMCW based radars. I am involved very closely on all aspects of the radar development ranging from developing the complete end-to-end system simulators, development of sophisticated direction-of-arrival estimation algorithms for 3D localization of targets, working closely with antenna engineers to specify the antenna arrays and antenna calibrations, specification of HW platform and defining the compute requirements, collection and analysis of field data.

Responsible for defining the complete wireless connectivity platform which included the next-gen cellular, WiFi+BT modem, CPU and high speed interfaces. Key contributions - - Defined the use cases for enhanced user experience. - Worked closely with Tier-1 silicon as well as module vendors for modems and CPUs to come up with the specification. - Collaborated with antenna designers to define requirements and come up with trial plans for new design and placement options. - Defined and supervised field trials for 802.11p using OBU/RSU equipment from a Tier-1 vendor.

Worked on next generation WiFi technology (IEEE802.11ax). I looked at aspects of UL-OFDMA such as UL-transmit power control and algorithms for link adaptation. I also looked into large scale video content delivery using reliable multicast mechanisms for Group Addressed Traffic Services (GATS) based on Direct Multicast Service (DMS) and GroupCast with Retries (GCR). I analyzed the throughputs that could be achieved using these methods, identified architectural bottlenecks and constraints in meeting KPIs.

Lead a systems team of 3 PhDs, 1 MS, working on defining architectures, developing algorithms and cross-layer optimization (L2/L1) for Cisco's LTE based femto cell product. The team was responsible for taking a basic third-party protocol stack and optimizing to deliver the best performance from layer 2 functions (QoS schedulers for downlink and uplink, ICIC, signalling optimization to improve capacity, DRX etc), with emphasis on meeting customer defined KPIs for VoLTE and video. Related activities include vendor evaluation for TD-LTE stacks, exploring options for timing and frame synchronization (e.g. 1588v2) etc. and SON.

Worked on Release 9 compliant LTE transceivers for the UE. I was primarily involved in testing and debugging closed loop power control (CLPC). I was made responsible for driving the effort to define the manufacturing time RF calibrations.

Worked on defining the architecture for key modules for a LTE eNB SoC. Also was briefly involved in a study to look into viability of using a software defined radio architecture to support transceivers for SmartGrid technogies.

Built a DSP + wireless transceiver design team in Pune to work on IEEE802.11n and Bluetooth Low Energy PHYs. Areas of work include baseband design (algorithm design, architecture definition), hardware verification and performance characterization.

Leading the DSP algorithm and architecture development group for IEEE802.11n draft compliant products. From 2001-2004 I was part of the systems team that designed the baseband transceiver algorithms for the first generation on IEEE802.11a,g products. I was responsible for architecting the equalizer, baseband filtering and developed all the algorithms that went into the design of the digital predistortion engine used for PA linearization. From 2004-2007 I lead the development of the first generation of Marvell's IEEE802.11n compliant MIMO baseband transceivers. Key components I was involved in were the MIMO equalizer (Zero-Forcing, ML), digital front end for transmit as well as receive side. I also led the initial investigations into LDPC code which is an optional feature, and was involved in providing guidance on initial investigations into transmit beam-forming. My work on LDPC as well as transmit beam-forming made its way into later generation products designed and sold by Marvell. As the Lead Systems Engineer involved in driving and co-ordinating the debugging of all field issues related to transceiver performance, mostly related to optimizing front end performance (AGC, Carrier Sense fine tuning etc.). During the course of my stint as Lead Systems Engineer I hired and mentored about 12 engineers (all PhDs). The core team that I helped build was in place for almost 8 years and generated all the IEEE802.11n, ac products from Marvell. This accomplishment gives as much pride as much as my own successes.

- Worked on second generation of DVB-S receivers (AGC, timing and frequency synchronization loops). - Worked on first generation of DVB-T receivers (one of the first technologies to adopt OFDM)