Wireless Transmitter Dynamic Preamble Adaptation
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Solution Overview
Problem
In wireless communication systems, existing technologies face challenges in efficiently utilizing frequency resources and maintaining compatibility between different wireless communication systems, particularly in MIMO systems where preamble signals may not be recognized by legacy systems, leading to signal collisions and reduced packet utilization efficiency.
Innovation Solution
A method and apparatus that dynamically switch between different packet formats by adding a preamble signal compatible with either the MIMO system or the legacy system, depending on the presence of compatible communication apparatus, to ensure efficient signal transmission and reception across multiple wireless communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed preamble signal pattern is used in MIMO systems, then compatibility with legacy systems is improved, but packet utilization efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the preamble signal pattern variable rather than fixed. The transmitting apparatus dynamically selects between different packet formats (first packet format with both first and second known signals, or second packet format with only second known signal) based on the presence of legacy communication apparatus, allowing the system to adapt between compatibility mode and efficiency mode
2Productivity
If the packet format is optimized for MIMO systems, then data transmission rate is improved, but compatibility with legacy systems deteriorates
Solution Approach 1:
The patent implements universality by designing a multi-functional packet format system that can serve both MIMO systems and legacy systems. The transmitting apparatus universally supports two packet formats: the first packet format ensures legacy system compatibility, while the second packet format optimizes for MIMO performance. The system automatically selects the appropriate format based on the communication environment, making it universally applicable to both system types
3Adaptability or versatility
If preamble signals are added for legacy system compatibility, then compatibility is improved, but signal collision risk increases
Solution Approach 1:
The patent applies the extraction principle by selectively removing the first known signal from the packet format when legacy communication apparatus are not detected. By extracting only the necessary second known signal for MIMO operation, the system avoids the signal collision problems that arise from legacy systems misinterpreting MIMO-specific preamble structures, while maintaining compatibility when needed
Data Source
AI summary
A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit.