Receiver Design for Physical Broadcast Channel in 5G NR

Bahadkar, Siddhesh and Kuchi, Kiran (2019) Receiver Design for Physical Broadcast Channel in 5G NR. Masters thesis, Indian institute of technology Hyderabad.

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Abstract

The 5th Generation Wireless Technology known as New Radio or NR is being developed by 3GPP (3rd Generation Partnership Project) since past few years which aims to address scenarios from Mobile Broadband to highly reliable communication with very low latency. Key advances in 5G include advanced antenna systems like Massive MI-MO, operations in higher frequency bands and achievable uplink and downlink high data rates in GBps. The Radio air interface of 5G NR includes physical layer and other higher layers as well. With the focus on physical layer, the technical specifications for NR released by 3GPP provide means to state-of-art realization and implementation of physical channels for both uplink and downlink. In NR, SS/PBCH block(SSB) consists of Synchronization signal(SS) and Physical Broadcast channel(PBCH). SSB is used to carry out cell search and identification to initialize a connection between UE and eNB. It also helps to manage handovers and beam sweeping for the radio coverage within the cell. The report aims at a detailed description on PBCH design, transmission and reception subject to a time varying wireless channel. PBCH transmitter is designed based on the technical specifications by 3GPP for 5G NR. PBCH data is generated and loaded with Demodulation reference signal(DMRS) for channel estimation at receiver.The combined data thus generated is mapped on sub-carriers and converted to time domain frames using Inverse Fourier transform (IFFT) as 5G NR is uses OFDM for both uplink and downlink transmissions. The time frames generated are convoluted with a time varying channel. The time varying channel is fast fading and follows Rayleigh distribution simulated using Jake’s model and Vehicle-A type power delay profile. AWGN noise based on SNR value is added which represents the environment noise and attenuation. The distorted and attenuated signal at the receiver is converted to frequency domain using FFT. Channel estimation is performed using DMRS. The channel equalization equalizes the time varying channel effect on the symbols and is further decoded to obtain PBCH payload.Finally the performance of the PBCH receiver is analyzed at low SNR values.

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