| MS Seminar

Name of the Speaker: Mr. PALLE CHAITANYA BHARATH (EE20S056)
Guide: Prof. Ganti Radha Krishnan
Co-Guide: Prof. Nitin Chandrachoodan
Venue: ESB-244 (Seminar Hall)
Online meeting link: https://meet.google.com/gfk-hyox-ibe
Date/Time: 31st July 2024 (Wednesday), 2:00 PM
Title: Implementation of Format A1 Physical Random Access Channel receiver for 5G NR Base station.

Abstract :

Physical Random Access Channel(PRACH) is an uplink physical reference signal in 5G that is transmitted by the User Equipment(UE) for uplink timing synchronization. Infact, PRACH is the first uplink signal transmitted by the UE, which let's the base station know that there exists a user trying to access it's services. The UE generates a zadoff-chu sequence from the available pool of sequences, appends a cyclic shift to it and then transmits it. Upon reception, the BS correlates the sequence with the available zadoff-chu sequences in the pool. If the received sequence matches with any of the available sequences at the base station, this results in a sharp peak. The position of the peak determines the cyclic shift that was applied at the UE. Also, we decode another parameter called timing advance, which essentially is a function of the distance between the UE and the BS. From the position of the peak, we also estimate the timing advance, which is sent back to the UE. The UE uses this timing advance command and adjusts it's uplink transmission timing, thus establishing uplink time synchronization. In this Work, i) We have developed an algorithm for reception and decoding of PRACH signal and verified it via matlab simulations ii) Implemented the algorithm on the FPGA, which is a part of our customised base band unit. iii) Multiple real time tests have been carried out using a 5G NR mobile phone to check the functioning of our PRACH receiver.