PTRS Phase Rotation for PAPR and Phase Noise Tracking
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing oscillator phase noise (PN) at high frequencies, particularly in mmWave bands, which degrades system performance, and the multiplexing of phase tracking reference signals (PTRS) with data impacts peak-to-average power ratio (PAPR) performance, especially in new radio (NR) systems with π/2-binary phase shift keying (BPSK) modulation and varying modulation orders and PRB sizes.
Innovation Solution
Applying phase rotation to phase tracking reference signals (PTRS) and data, considering parameters like PTRS pattern, power boost, and frequency domain spectral shaping filters, to improve peak-to-average power ratio (PAPR) performance without additional complexity, while maintaining block error rate (BLER) performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PTRS is multiplexed with data to track phase noise, then phase noise estimation performance is improved, but PAPR performance deteriorates
Solution Approach 1:
The patent applies phase rotation to PTRS symbols, changing the phase parameter of the reference signal. This transformation modifies the signal characteristics to reduce peak power while preserving phase noise tracking capability. The phase rotation angle can be adjusted based on different modulation orders and PTRS patterns to optimize PAPR performance for each specific configuration.
Solution Approach 2:
The patent introduces dynamic phase rotation that adapts to different modulation orders (QPSK, 16-QAM, 64-QAM, 256-QAM) and different PTRS patterns. The phase rotation parameter is not fixed but varies according to the specific transmission conditions, allowing the system to maintain optimal PAPR performance across diverse operating scenarios while continuously tracking phase noise.
2Measurement precision
If different power boost factors are used for different modulation orders, then phase noise tracking accuracy is improved, but system complexity increases
Solution Approach 1:
The patent modifies the phase parameter of PTRS through phase rotation rather than relying solely on power boost factors. This approach maintains tracking accuracy while providing a unified solution that works across different modulation orders without requiring separate complex power adjustment mechanisms for each modulation type.
Solution Approach 2:
The phase rotation technique serves as a universal solution that can be applied across all modulation orders (QPSK, 16-QAM, 64-QAM, 256-QAM) and different PTRS patterns. A single phase rotation mechanism replaces the need for multiple specialized power boost factors, reducing system complexity while maintaining universal applicability.
3Measurement precision
If different PTRS patterns are used for different PRB sizes, then phase noise estimation performance is improved, but PAPR performance varies and becomes difficult to optimize
Solution Approach 1:
The patent applies phase rotation as an additional parameter transformation that works in conjunction with different PTRS patterns. The phase rotation angle can be specifically tailored for each PRB size and PTRS pattern combination, allowing the system to maintain both accurate phase noise estimation and optimized PAPR performance for each specific configuration rather than having to compromise between them.
Data Source
AI summary
The present disclosure relates to phase rotation of phase tracking reference signals (PTRSs). Signaling that indicates information associated with a PTRS is communicated between communication devices in a wireless communication network. Data, multiplexed with the PTRS to which a phase rotation has been applied, is transmitted or received in the wireless communication network. The information associated with the PTRS may be or include, for example, one or more of: a PTRS pattern, a physical resource block (PRB) size for transmitting the data and the PTRS, a PTRS power boost for transmitting the PTRS, a pulse shaping parameter associated with pulse shaping that is to be applied to the data and the PTRS, and a rotation angle of the phase rotation.