Wireless Preamble Duplication for Backwards Compatibility
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Solution Overview
Problem
Current wireless transmission systems face challenges in maintaining backwards compatibility with legacy nodes while providing advanced features like higher throughput and outdoor channel support, particularly in efficiently transmitting preamble information across different frequency bands.
Innovation Solution
The method involves duplicating preambles in the frequency domain, puncturing specific fields with different patterns, and transmitting these duplicate preambles alongside the payload, ensuring that each preamble occupies a specific frequency band, thereby increasing redundancy and spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preambles are duplicated in the frequency domain with different puncturing patterns, then reliability is improved through redundancy, but device complexity increases due to multiple puncturing patterns and frequency band management
Solution Approach 1:
The patent applies copying by duplicating the preamble structure across multiple frequency bands. Each duplicate preamble contains the same fundamental information fields (SIGA, SIGB) but applies different puncturing patterns to create redundant copies that can be independently decoded, thereby improving reliability without requiring fundamentally new processing mechanisms
Solution Approach 2:
The patent segments the frequency spectrum into multiple bands, with each band carrying a duplicate preamble with a distinct puncturing pattern. This segmentation allows the system to distribute redundancy across frequency divisions, enabling receivers to combine information from multiple segments to overcome errors in any single segment
2Productivity
If multiple puncturing patterns are applied to duplicate preambles, then spectral efficiency is improved through better error resilience, but ease of operation deteriorates due to increased processing requirements at receivers
Solution Approach 1:
The patent changes parameters by applying different puncturing patterns to duplicate preambles in different frequency bands. This parameter variation creates diversity in the transmitted signals, allowing receivers to exploit these differences through combining operations that improve spectral efficiency while maintaining manageable processing requirements through standardized algorithms
3Adaptability or versatility
If preamble information is transmitted across multiple frequency bands, then adaptability is improved for different channel conditions, but loss of information increases due to potential puncturing of critical fields
Solution Approach 1:
The patent applies beforehand cushioning by creating redundant duplicate preambles with different puncturing patterns before transmission. This preparatory redundancy ensures that even if critical fields are punctured in one frequency band, the same information remains available in other bands with different puncturing patterns, cushioning against information loss across varying channel conditions
Data Source
AI summary
An aspect of the disclosure provides a wireless frame transmission method. Such a method includes duplicating a preamble in the frequency domain to form at least one duplicate preamble, each preamble having multiple fields. The method further includes puncturing at least one of the preamble fields in the preamble with a first puncturing pattern and puncturing corresponding preamble fields in the at least one duplicate preamble with at least one additional puncturing pattern. The method further includes transmitting a frame including the preamble, the at least one duplicate preamble and a payload. In some embodiments the preamble and the duplicate preambles are each at different frequencies.