Wireless Channel Estimation with Segmented Known Signals for Long Delays
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Solution Overview
Problem
Existing channel estimation methods using fixed-length training signal sections are limited by the estimated delay wavelength, leading to increased channel estimation errors and reduced transmission capacity when dealing with long delay waves.
Innovation Solution
A method involving dividing and arranging a known signal into frames, transmitting it as a radio frame with data, extracting and concatenating delay wave components to restore a known signal of predetermined length for accurate channel estimation without extending the training signal section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a longer training signal section is used to estimate longer delay waves, then channel estimation accuracy is improved, but transmission capacity is reduced
Solution Approach 1:
The patent divides the known signal into multiple frames, where each frame contains a portion of the known signal. This segmentation allows the receiver to process and estimate channel characteristics from multiple smaller segments rather than requiring one long continuous training signal, thereby maintaining transmission capacity while improving channel estimation accuracy for long delay waves.
Solution Approach 2:
The patent introduces a temporal dimension by arranging multiple frames in time sequence. The receiver combines information from multiple frames to estimate the channel response, effectively transforming a single-dimensional training signal into a multi-dimensional structure that provides additional information for accurate channel estimation without increasing the total training signal length.
2Productivity
If a fixed-length training signal section is used, then transmission capacity is maintained, but channel estimation accuracy deteriorates when delay waves exceed the estimated delay wavelength
Solution Approach 1:
The patent makes the training signal structure dynamic by using multiple frames that can be processed in sequence. This dynamic approach allows the receiver to adaptively estimate channel characteristics over time from the multiple frames, enabling accurate estimation of longer delay waves while maintaining the fixed-length structure of individual frames for efficient transmission.
Solution Approach 2:
The patent ensures continuity of useful action by arranging multiple frames in time sequence, where each frame contributes to the overall channel estimation. The receiver continuously processes these frames to build up an accurate picture of the channel response, maintaining transmission capacity while improving estimation accuracy through continuous information gathering.
Data Source
AI summary
A channel estimation method in which a reception device performs channel estimation on the basis of a known signal transmitted by a transmission device divides and arranges a known signal having a predetermined length in frames, transmits the known signal divided and arranged in the frames together with a data signal as a radio frame, receives the transmitted radio frame, calculates a data signal component including a delay wave component from the received radio frame, extracts a plurality of known signal components each including a delay wave component of the divided and arranged known signal by subtracting the data signal component from the received radio frame, concatenates the plurality of extracted known signal components to restore a known signal having a predetermined length, and performs channel estimation on the basis of the restored known signal having a predetermined length.