Optimized Pilot Pattern Tile Sequence for Bandwidth Efficiency
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Solution Overview
Problem
Current radio communication systems face inefficiencies in bandwidth usage due to redundant pilot sub-carriers, which hinder the effective transmission of data subcarriers and impact channel estimation performance.
Innovation Solution
The method involves generating a sequence of tiles with optimized pilot patterns that reduce redundant pilot sub-carriers, allowing for efficient pilot signal transmission and improved data subcarrier allocation, specifically by using a 4*3 tile structure with two or four pilot sub-carriers, and generating transmission signals based on these patterns for network transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pilot patterns are used to ensure reliable channel estimation, then channel estimation performance is maintained, but bandwidth efficiency deteriorates due to redundant pilot sub-carriers
Solution Approach 1:
The pilot pattern is segmented into two distinct types (first pilot pattern with two pilot sub-carriers and second pilot pattern with four pilot sub-carriers) that are alternately applied to different tiles in the time-frequency grid. This segmentation allows the system to distribute pilot resources more efficiently across the bandwidth while maintaining channel estimation reliability through the alternating pattern.
Solution Approach 2:
The patent implements a periodic alternation between the first and second pilot patterns across sequential tiles in the time-frequency domain. This periodic action creates a structured, predictable pilot distribution that maintains estimation reliability while reducing overall pilot overhead compared to using a single dense pilot pattern throughout.
2Measurement precision
If more pilot sub-carriers are allocated to improve channel estimation accuracy, then measurement precision is improved, but the number of data subcarriers decreases
Solution Approach 1:
Instead of uniformly allocating four pilot sub-carriers to every tile (excessive action), the patent applies the higher-density second pilot pattern only to alternating tiles, while using the lower-density first pilot pattern on other tiles. This partial application of the denser pattern maintains measurement precision where needed while freeing up sub-carriers for data transmission overall.
Solution Approach 2:
The patent changes the pilot sub-carrier parameter dynamically across different tiles by alternating between two configurations (2 pilots and 4 pilots). This parameter variation allows the system to adapt pilot density to local channel conditions and tile positions, optimizing the balance between estimation accuracy and data capacity.
Data Source
AI summary
An approach is provided for generating a pilot pattern. A sequence of tiles is generated, wherein the tiles are arranged to avoid redundant pilot sub-carriers by utilizing different pilot patterns. A transmission signal is generated according to the generated sequence for transmission over a network.