Frequency-Domain PTRS Mapping for Multi-Stream Phase Noise Estimation
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Solution Overview
Problem
High-frequency communication systems face performance deterioration due to phase noise, carrier frequency offset, and Doppler frequency shift, particularly in multi-user spatial multiplexing and single-user multi-stream non-coherent crystal oscillator scenarios, where existing phase noise estimation methods fail to account for frequency domain channel equalization.
Innovation Solution
A method and apparatus that transform specific frequency domain signals into signals with invariant amplitude and phase for phase noise estimation, enabling phase noise processing in the frequency domain by determining amplitude and phase based on initial signals, and using indication information to reduce parsing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PTRS is processed only in time domain for phase noise compensation, then time domain demodulation can be performed, but residual phase noise remains unprocessed during frequency domain channel equalization, causing interference between multiple data streams and deteriorating receive end performance
Solution Approach 1:
The patent transitions phase noise processing from the time domain to the frequency domain by performing FFT on the received signal and processing PTRS in the frequency domain. This dimensional change enables phase noise estimation to account for frequency domain channel equalization effects, resolving the contradiction between time domain demodulation capability and frequency domain phase noise processing accuracy.
2Productivity
If high frequency bands are used to achieve high bandwidth and high throughput, then communication capacity is improved, but phase noise, carrier frequency offset, and Doppler frequency shift cause serious intermediate frequency/radio frequency distortion and performance deterioration
Solution Approach 1:
The patent replaces traditional time domain phase noise compensation methods with frequency domain processing. By performing FFT and processing PTRS in the frequency domain, the system can effectively compensate for phase noise, carrier frequency offset, and Doppler frequency shift that plague high-frequency communications, thereby maintaining signal quality while utilizing high frequency bands for high throughput.
3Productivity
If multi-user spatial multiplexing multi-stream or single-user multi-stream non-coherent crystal oscillator scenarios are implemented to increase data capacity, then communication efficiency is improved, but interference between multiple data streams affects time domain demodulation and receive end performance deteriorates
Solution Approach 1:
The patent resolves multi-stream interference by moving phase noise processing to the frequency domain. By performing FFT and estimating phase noise per subcarrier, the system can separate and compensate for phase noise affecting different data streams independently, enabling accurate demodulation in multi-user spatial multiplexing and multi-stream scenarios.
Data Source
AI summary
Embodiments of this application provide a communication method and apparatus, to implement phase noise estimation in a multi-user spatial multiplexing multi-stream or single-user multi-stream non-coherent crystal oscillator scenario, and can be applied to a 5G communication system. The communication method includes: generating a first time domain signal and sending the first time domain signal, where a first frequency domain signal corresponding to the first time domain signal is obtained by transforming a first signal at one or more first frequency domain positions on a second frequency domain signal into a second signal, the second signal is used for phase noise estimation, an amplitude of the second signal is determined based on an amplitude of the first signal, and a phase of the second signal is determined based on a phase of the first signal.