| MS TSA Meeting

Name of the Speaker: Ms. PREETHI R (EE19S001)
Guide: Dr. Giridhar K
Venue: online
Online meeting link: meet.google.com/ffj-xzrw-afg
Date/Time: 1st July 2024 (Monday), at 2:00 PM
Title: Intelligent Downlink DM-RS Port Allocation for Improved Channel Estimation in 5G NR

Abstract :

The Demodulation Reference Signal (DM-RS) pilot pattern in 5G NR uses Orthogonal Cover Codes (OCC) and frequency orthogonal pilot positions to enable channel estimation of different users or spatially multiplexed layers of the same user. These OCCs utilize Walsh-Hadamard codes in a pilot-on-pilot arrangement to introduce code orthogonality. The choice of the OCC and frequency position of the pilot sequence can improve the channel estimate quality, when the resources are not fully occupied. The implicit pattern of OCC code structure is exploited, which is similar to Orthogonal Variable Spreading Factor codes. With the help of an appropriate de-noising and interpolation scheme, the proposed estimation scheme is shown to significantly reduce the Mean Square Error (MSE) of the channel estimates for various DM-RS configurations. In this work, channel estimate quality has been analysed for different configurations of DM-RS, for a downlink channel. A performance improvement in MSE of upto 7 dB is achieved at high SNRs.