Jul 2022 – Aug 2024 · 2 yrs 1 mo · Bengaluru, Karnataka, India

• 1. 2D Convolution Neural Networks based approach to replace existing LS based channel estimation and MMSE based equalization.The ML code in python was converted to CPP using oneDNN such that to use in a real time system with trained model weights and biases.
• 2. Development of ORAN based Rx ethernet packet qualifiers and simulation testing environment with physical layer with simulated MAC and Radio Unit. This was used to test DL, UL, PRACH, SRS and FDX in numerology 1 and 0 for TDD and FDD.
• 3. The above test framework was used to solve issues like downlink configuration context and IQ buffer increment for 8T8R, SRS and PRACH test case parsing , SRS and Uplink task completion race conditions, time based CRC threshold for delayed RU and generalized numerology and slot configuration along with scaling for 8T8R.
• 4. Development of Delay Spread Algorithms using frequency domain correlation, 4 RB frequency domain sliding interpolation using sinc function and UL 256 QAM. These were tested in UT as well as in 3CC/ 1CC OTA setups.
• 5. Dynamic cell deletion and addition feature design, implementation and testing. This design removed limitations of any particular cell index to be present, removal any number of cells , addition of any number of cells, removal of all cells and then addition, logging framework to restart once all cells deleted, any order cell addition, no need of upper limit of cells to be pre configured by MAC and memory optimisation.
• 6. Baseline core mask and task splits for TDD mu1 100Mhz for a fully loaded 3CC FDX test case with SRS by profiling and using hyper threading. Also included is KW fixes, DPDK fixes.

Feb 2020 – Jul 2022 · 2 yrs 5 mos · Bengaluru, Karnataka, India

• 1. 5G NR Physical Layer Firmware Engineer: Design, coding and testing of firmware code for deployment of Intel FlexRAN base in real world scenario.
• 2. 5G NSA System Integrated Testing: Performed integrated testing for new features like multi cell bring up(2CC and 4CC), UCI over PUSCH, 2*2 MIMO, 4*4 MIMO etc. Knowledge in CU/DU server, 5G cell bring up and PRACH, SPF switches, Ferry bridge, Terasic NIC card, Aceaxis RRH, Simnovus Amarisoft and VIAVI E500/TM500 UE attach, DL/UL data throughput etc
• 3. 5G ORAN: Working on 5G L1 ODU integration with XRAN and OFGD and ORU for 8CC FDX with dynamic C plane section creation for PUCCH, PUSCH, CSI RS and SRS. In addition to this frequency compensation MATLAB and C code was developed. The final goal is to provide ORAN based network solution to customers.
• 4. 5G LDPC and FFT: Worked on integrating XILINX IP to Uplink IQ sample generation. Bring up and integration HW VistaCreek and SW LDPC to TX/RX chain.
• 5. 5G CA: Enhanced the GNode B capability from 1 cell to multi cell and carrier aggregation support with L2 simulation.
• 6. 5G SA and SSB: 5G cell detection on SA setup. Rectification major issues related to fix point and floating point multiplication. Along with this adjustment for pre IFFT scaling factors for right power generation for SSB. These were done with FAPI interface in mind. Along with that powers were verified on Keysight HW and SW signal analyzers(VSA).
• 7. 5G Dynamic Cell addition: Design of dynamic cell addition , cell deletion and cell reconfiguration features for NR L1 firmware code.
• 8. 5G UCI over PUSCH: Finding the threshold for DTX detection of UCI over PUSCH from UE under different SNR, delay spread and doppler and communicating that to layer 2(L2).
• 9. 5G Equalization Enhancements: Use of MATLAB perfect channel estimate to find the performance of equalization module and efficiency under varied channel conditions. Analysis of MMSE, and ZF algorithms for equalization.This also included RX antenna reduction.

Jun 2018 – Feb 2020 · 1 yr 8 mos

• 1. Detection and analysis of software bugs and customer issues for physical layer firmware code for LTE
• 2. Ownership of Control channel MIMO algorithms , Narrow Band Interference detection, Timing drift estimation, time domain and frequency domain interpolation
• 3. Unit testing and integration testing for assigned modules.
• 4. LAA design and implementation for downlink control channels
• 5. DC spur handling for performance enhancement
• 6. Optimization of vector DSP code.
• 7. Innovative method to log valuable information regarding the LLR of PDCCH channel.
• 8. Wrote a white paper on Dual Radio Dual Receive Dual Sim in LTE using Carrier Aggregation (CA)
• 9. Working with tools like ELT, LV, HERMES, MATLAB and setting up of PXP platform for MCPS calculations.

Jul 2017 – May 2018 · 10 mos

• 1. Detection and analysis of physical layer firmware code for UMTS
• 2. Ownership of downlink power control , uplink power control and closed loop transmit diversity.
• 3. Setting up debugging scripts using MATLAB for the assigned modules.
• 4. Implementation of DLPC algorithm in MATLAB for checking precision and output errors.
• 5. Porting from a MD32 code base to USIP code base. Verification using UT.
• 6. Log throughout reduction for 3G DSP.
• 7. White paper on low power receiver mode for UMTS downlink.
• 7. Presanity testing on smartphone.

Jul 2015 – Jun 2017 · 1 yr 11 mos · Bengaluru, Karnataka, India

• Masters student in Signal Processing in Electrical Engineering Department.

Aug 2011 – Aug 2015 · 4 yrs · Kolkata, West Bengal, India

• BE in Electrical Engineering