PUCCH Design for DFT-s-OFDM Above 52.6 GHz
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Solution Overview
Problem
Current 5G new radio (NR) systems face challenges in designing physical uplink control channels (PUCCH) for carrier frequencies above 52.6 GHz, particularly with DFT-s-OFDM waveforms, due to issues like low power amplifier efficiency and large phase noise, which affect decoding latency and phase tracking.
Innovation Solution
The proposed solution involves multiplexing demodulation reference signals (DMRS) and uplink control information (UCI) in a time division multiplexing (TDM) manner, applying DFT operations for UCI transmission, using π/2 BPSK modulation, and inserting phase tracking reference signals (PT-RS) to compensate for phase noise, ensuring consistent phase rotation across PUCCH and PT-RS symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DFT-s-OFDM waveform is used for PUCCH transmission above 52.6 GHz, then power amplifier efficiency is improved, but phase noise effects increase
Solution Approach 1:
Phase tracking reference signals (PT-RS) are inserted as intermediary elements between the transmitted signal and the channel to compensate for phase noise. The PT-RS provides a reference for estimating and correcting phase rotations caused by frequency offsets and phase noise, enabling the system to maintain reliable communication despite the harmful phase noise effects at high frequencies
Solution Approach 2:
The system changes the modulation scheme to π/2 BPSK specifically for PUCCH transmissions above 52.6 GHz. This parameter change in modulation format, combined with the single-carrier DFT-s-OFDM waveform, reduces the impact of phase noise while maintaining power amplifier efficiency. The constellation rotation by π/2 further helps in mitigating phase noise effects
2Loss of time
If demodulation reference signals and uplink control information are multiplexed in TDM manner, then decoding latency is reduced, but time resources are increased
Solution Approach 1:
The PUCCH transmission is segmented into distinct time resources: one set of resources for demodulation reference signals (DMRS) and another set for uplink control information (UCI). This segmentation allows the receiver to process DMRS and UCI separately, reducing the time required to decode the control information while maintaining efficient use of time resources through proper resource allocation
3Measurement precision
If phase tracking reference signals are inserted for phase noise compensation, then phase tracking accuracy is improved, but signal complexity is increased
Solution Approach 1:
Phase tracking reference signals are inserted at specific local positions within the PUCCH transmission structure rather than uniformly throughout. The PT-RS are placed at designated time-frequency resources where they provide localized phase compensation, improving phase tracking accuracy at critical points while minimizing the overall increase in signal complexity
Data Source
AI summary
Various embodiments herein provide physical uplink control channel (PUCCH) designs for discrete Fourier transform-spread-orthogonal frequency-division multiplexing (DFT-s-OFDM) waveforms for systems operating above the 52.6 GHz carrier frequency. Some embodiments of the present disclosure may be directed to phase tracking reference signal (PT-RS) design for PUCCH with carrier frequencies above 52.6 GHz. Other embodiments may be disclosed and/or claimed.