Pilot Block Insertion for Phase Noise Compensation
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Solution Overview
Problem
High-frequency wireless communications systems face significant performance degradation due to phase noise caused by unstable oscillators, leading to inaccurate phase noise estimation and compensation, especially when additive white noise is present, resulting in reduced system performance and increased packet error rates.
Innovation Solution
A signal transmission method that inserts multiple pilot blocks with consecutive pilot symbols into data blocks, allowing for improved phase noise estimation and compensation without increasing pilot overheads, using interpolation or weighted averaging algorithms to accurately track phase noise variations and adapt to changing noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single pilot symbol is inserted at fixed intervals, then pilot overhead is reduced, but phase noise estimation accuracy deteriorates due to additive white noise impact
Solution Approach 1:
The patent divides the data block into multiple segments and inserts multiple pilot blocks at different positions within each segment. This segmentation approach allows the system to maintain lower overall pilot overhead while obtaining multiple phase noise measurements that can be combined through weighted averaging to improve estimation accuracy and reduce the impact of additive white noise.
Solution Approach 2:
The patent implements a feedback mechanism where the receiver estimates phase noise at multiple pilot positions and uses weighted averaging to compute a more accurate overall phase noise value. This feedback loop continuously refines the phase noise estimation by leveraging multiple measurements, thereby improving accuracy without proportionally increasing pilot overhead.
2Measurement precision
If multiple pilot blocks are inserted to improve phase noise estimation, then phase noise compensation accuracy is improved, but pilot overhead increases
Solution Approach 1:
The patent applies local quality by inserting a small number of pilot blocks at strategically chosen positions within each data segment rather than uniformly distributing pilots throughout the entire block. This localized approach concentrates pilot resources where they provide maximum benefit for phase noise estimation while minimizing overall overhead.
Solution Approach 2:
The patent uses partial action by inserting pilot blocks at selected positions rather than at every possible position. The weighted averaging algorithm processes these partial measurements to achieve accurate phase noise compensation, avoiding the excessive pilot overhead that would result from complete coverage.
3Device complexity
If pilots are inserted at fixed intervals, then implementation complexity is reduced, but adaptability to changing noise levels deteriorates
Solution Approach 1:
The patent transitions from fixed-interval pilot insertion to a dynamic approach where pilot blocks are inserted at multiple positions within data segments. The receiver dynamically adjusts the weighting of phase noise estimates from different pilot positions based on local noise conditions, enabling adaptation to varying noise levels while maintaining manageable implementation complexity.
Solution Approach 2:
The patent changes the parameter of pilot position from fixed to variable, allowing pilots to be placed at multiple positions within segments. Combined with weighted averaging that adapts weights based on noise conditions, this parameter change enables the system to adapt to different noise environments without significantly increasing implementation complexity.
Data Source
AI summary
A signal transmission method and apparatus are provided. The method includes: obtaining, by a transmitter, a to-be-sent data block; inserting one or more pilot blocks among a plurality of pieces of data of the to-be-sent data block based on an agreed position; and sending, by the transmitter, the to-be-sent data block into which the one or more pilot blocks are inserted. Inserting the one or more pilot blocks among the plurality of pieces of data of the to-be-sent data block can improve a phase noise compensation effect for a receiver without increasing pilot overheads.