Implementation of PDSCH Receiver and CSI-RS for 5G-NR

Kumar, Gautham and Kuchi, Kiran (2019) Implementation of PDSCH Receiver and CSI-RS for 5G-NR. Masters thesis, Indian institute of technology Hyderabad.

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Abstract

PDSCH (Physical Downlink Shared Channel) is the data-bearing channel in 5G-NR. In order to decode data, it needs DCI (downlink control Information) from PDCCH (Physical Downlink Control Channel). PDSCH uses LDPC(Low-Density Parity Check) code for encoding the data which is an errorcorrecting code. One of the main blocks of PDSCH is Rate Matching and scrambling followed by modulation. NR supports modulation up-to 256 QAM (Quadrature Amplitude Multiplexing). AWGN and TDLC channel Model (delay spread) as defined in 3GPP specifications are used for the simulation purpose. The Channel estimator used for PDSCH is Least square followed by tone-averaging and linear interpolation in time. The block error rate performance highly depends on the channel quality between the base station and the receiver. For acquiring the channel quality, NR specifies a special type of cell-specific reference signal which can be configured for transmission on up-to 32 antenna ports. The CSI-RS resources are code, frequency and time division multiplexed. After passing through the channel the CSI receiver estimates the channel, and finds the suitable rank, the precoding matrix to be used and the MCS and feeds it back to the transmitter which is free to use the recommendation give by UE or follow its own. In either case, it signals the parameters used in the base station back to UE.

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