Reference Signal Layout for Terahertz Phase Noise Estimation
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Solution Overview
Problem
Long Term Evolution (LTE) systems face challenges with out-of-band leakage and phase noise in terahertz scenarios, leading to inter-subband interference and reduced spectral efficiency, which existing phase tracking reference signals cannot adequately address.
Innovation Solution
A method involving the transmission of a first reference signal through the first H symbols and a second reference signal through the last T symbols of a physical resource block, where H and T are greater than or equal to 2, to enhance phase noise estimation and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If CP-OFDM is used to solve multipath delay, then multipath delay is suppressed, but out-of-band leakage increases causing inter-subband interference
Solution Approach 1:
The patent segments the reference signal transmission into two distinct parts: a first reference signal transmitted through the first H symbols and a second reference signal transmitted through the last T symbols. This segmentation allows independent optimization of each segment's function, enabling accurate phase noise estimation while maintaining spectral efficiency without requiring additional guard intervals.
Solution Approach 2:
The patent changes the temporal distribution parameter of reference signals by transmitting them at both the beginning (first H symbols) and end (last T symbols) of the physical resource block. This parameter change enables the system to capture phase noise characteristics across the entire transmission interval, improving estimation accuracy for terahertz frequencies where phase noise is more severe.
2Object-generated harmful factors
If guard intervals are added in frequency domain to suppress out-of-band leakage, then spectral efficiency decreases
Solution Approach 1:
The patent extracts the phase noise estimation function from the data transmission symbols and implements it through dedicated reference signal segments at the beginning and end of the physical resource block. This extraction allows phase noise compensation to be performed separately, improving estimation accuracy without consuming additional spectral resources through guard intervals.
Solution Approach 2:
The reference signal segments serve multiple functions: they enable phase noise estimation, support frequency offset correction, and provide channel estimation capabilities. This multi-functionality allows the system to achieve accurate demodulation performance without requiring additional dedicated resources for each function, thereby maintaining spectral efficiency.
3Measurement precision
If existing PTRS design is used, then phase noise estimation is sufficient for conventional frequencies, but it cannot satisfy the requirement for larger phase noise in terahertz scenario
Solution Approach 1:
The patent implements preliminary action by transmitting the first reference signal at the beginning of the physical resource block (first H symbols) before the actual data transmission. This allows the receiving end to perform phase noise estimation based on known reference signal characteristics before demodulating the data, thereby improving estimation accuracy for terahertz frequencies where phase noise varies more rapidly.
Solution Approach 2:
The patent implements feedback by transmitting the second reference signal at the end of the physical resource block (last T symbols) after data transmission. The receiving end uses this second reference signal to provide feedback information about the actual phase noise experienced during transmission, enabling correction of estimation errors and improving overall demodulation performance in terahertz scenarios.
Data Source
AI summary
Provided are a reference signal transmission method and apparatus, a communication node, and a storage medium. The method includes transmitting a first reference signal through the first H symbols of a physical resource block in the time domain, where H is greater than or equal to 2; and transmitting a second reference signal through the last T symbols of the physical resource block in the time domain, where T is greater than or equal to H.