PTRS Resource Block Structure for Phase Noise Compensation
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Solution Overview
Problem
High-frequency wireless communications systems above 6 GHz suffer from significant phase noise, intermediate radio frequency distortion, and increased Doppler effect and carrier frequency offset, leading to performance deterioration and high bit error rates, especially with high-order modulation schemes like 256 QAM or 1024 QAM, due to unaddressed inter-carrier interference.
Innovation Solution
A reference signal transmission method that generates OFDM symbols with specific PTRS resource blocks, including cyclic prefixes and suffixes, to reduce inter-carrier interference by accurately estimating and compensating for phase noise, thereby improving spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency resources are used to increase communication rate and capacity, then throughput is improved, but phase noise impact increases
Solution Approach 1:
The patent introduces PTRS (Phase Tracking Reference Signal) as an intermediary element to measure and compensate for phase noise in high-frequency communications. The PTRS sequence is inserted into the signal stream, allowing the receiver to estimate phase noise and apply compensation, thus mediating the harmful effect of phase noise while maintaining high-frequency operation
Solution Approach 2:
The patent implements a feedback mechanism where the receiver estimates phase noise based on received PTRS and feeds back phase compensation information to the transmitter. This closed-loop feedback allows continuous tracking and compensation of phase noise, enabling stable high-frequency communication despite increasing phase noise with frequency
2Productivity
If high-order modulation schemes are used to meet increasing communication requirements, then spectral efficiency is improved, but inter-carrier interference increases
Solution Approach 1:
The patent uses PTRS as an intermediary to measure and compensate for inter-carrier interference caused by phase offset. By inserting known reference signals, the system can detect ICI effects and apply compensation algorithms, enabling the use of high-order modulation schemes like 256 QAM and 1024 QAM while maintaining acceptable error rates
3Object-affected harmful factors
If PTRS is introduced to measure and compensate for phase noise, then phase noise impact is reduced, but device complexity increases
Solution Approach 1:
The patent employs parameter changes by varying PTRS density, sequence length, and resource element allocation based on channel conditions and frequency band. This allows the system to adapt the complexity of phase noise compensation to match the actual phase noise severity, using more aggressive PTRS configurations only when necessary in high-frequency bands
Data Source
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AI summary
This application discloses a reference signal transmission method and apparatus. The method includes: generating one or more OFDM symbols, where at least one OFDM symbol includes a PTRS resource block, the PTRS resource block includes at least two of three sequences: a PTRS sequence of Y elements, X elements after the PTRS sequence, and Z elements before the PTRS sequence, and the PTRS resource block occupies a plurality of consecutive resource elements REs, where X, Y, and Z are all integers; and sending the one or more OFDM symbols. According to the foregoing method and apparatus, inter-carrier interference is reduced, thereby improving spectral efficiency.