PTRS Orthogonal Cover Codes for 6G Phase Noise Compensation
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Solution Overview
Problem
The increasing complexity and data demands in 5G and emerging 6G wireless networks pose challenges in phase tracking reference signals, particularly due to phase noise affecting data demodulation performance, especially at higher frequencies used in 6G communications.
Innovation Solution
The implementation of improved phase tracking reference signals (PTRS) in 6G DFT-s-OFDM systems, utilizing orthogonal cover codes for different antenna ports and distributing PTRS symbols in the time domain to enhance phase noise estimation and compensation, allows for better phase tracking accuracy across multiple base stations and antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase tracking reference signals are used in 5G/6G wireless networks, then data demodulation performance is improved, but phase noise estimation accuracy deteriorates at higher frequencies
Solution Approach 1:
The patent segments the phase tracking reference signal into multiple antenna ports, each with dedicated PTRS resources. This segmentation allows independent phase noise estimation for each antenna port, improving measurement accuracy at higher frequencies while maintaining data demodulation performance across multiple antennas.
Solution Approach 2:
The patent introduces orthogonal cover codes as an additional dimension for distinguishing PTRS from different antenna ports. By encoding PTRS with orthogonal sequences in the time domain, the system can separate and estimate phase noise for each antenna port independently, resolving the accuracy issue at higher frequencies.
2Measurement precision
If multiple antenna ports are used for phase tracking, then phase tracking accuracy is improved, but device complexity increases
Solution Approach 1:
The patent makes the orthogonal cover code structure universal across multiple antenna ports. The same orthogonal encoding mechanism is applied to all PTRS ports, allowing the system to handle multiple antenna ports with a standardized approach rather than requiring separate complex processing for each port.
Solution Approach 2:
The patent applies orthogonal cover codes to PTRS in advance during signal generation. This preliminary encoding simplifies subsequent processing at the receiver, as the orthogonal structure is already embedded in the transmitted signal, reducing the complexity of phase tracking operations.
3Measurement precision
If PTRS symbols are distributed in time domain, then phase noise estimation is enhanced, but loss of time increases
Solution Approach 1:
The patent distributes PTRS symbols periodically across time slots with orthogonal cover codes. This periodic distribution allows phase noise estimation to be performed at multiple time instances, enhancing accuracy by capturing phase variations over time while maintaining a regular, predictable pattern that minimizes time overhead.
Solution Approach 2:
The patent uses orthogonal cover codes to enable partial phase noise estimation using only the PTRS resources that are actually transmitted. This allows the system to achieve sufficient phase noise estimation accuracy without requiring excessive PTRS overhead, as the orthogonal structure enables efficient use of available reference signals.
Data Source
AI summary
An apparatus and system to compensate for phase noise in a 5G or 6G DFT-S-OFDM signal are described. An access port (AP)-specific orthogonal cover code (OCC) is applied to phase tracking reference signal (PTRS) symbols in each of a plurality of PTRS groups. The PTRS group are inserted between data symbols to form a data vector prior to perform transform precoding on the data vector and transmission to a UE. The UE extracts the PTRS symbols from different PTRS APs using the OCC specific to each AP. After extraction, the phase noise for each PTRS group is estimated and used to compensate the data symbols associated with the PTRS group.