Channel Estimation Signals Using Precoding Diversity in WLAN Packets
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Solution Overview
Problem
Existing methods for channel estimation in wireless local area network (WLAN) are inefficient in terms of resource utilization and/or resource utilization.
Innovation Solution
The method comprises configuring the transmitter to use different precoding settings for at least two of the plurality of measurement signals for channel estimation, including configuring the transmitter to use different precoding settings for at least two of the plurality of measurement signals for channel estimation, and transmitting the physical layer packet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional channel estimation methods using LTFs are used, then channel estimation can be performed, but resource utilization is inefficient and achievable resolution is lower than desired
Solution Approach 1:
The patent makes data payloads serve dual purposes: they carry information data while simultaneously functioning as measurement signals for channel estimation and sensing. This eliminates the need for separate dedicated measurement signals, improving resource utilization efficiency while enabling high-resolution sensing through the accumulated measurements from multiple data payloads.
Solution Approach 2:
The patent changes the parameter of measurement signal diversity by using multiple data payloads with different precoding settings instead of traditional LTF-based methods. This parameter change enables higher sensing resolution through multiple measurements while improving resource efficiency by reusing existing data transmission resources.
2Measurement precision
If multiple measurement signals are provided for high-resolution sensing, then sensing resolution improves, but resource utilization becomes inefficient
Solution Approach 1:
Each data payload serves multiple functions: data transmission and channel measurement. By accumulating measurements from multiple data payloads, the system achieves high-resolution sensing without needing separate dedicated measurement signals, thus reducing the total quantity of measurement signals required.
Solution Approach 2:
The patent merges the data transmission function with the measurement function by using data payloads as measurement signals. This consolidation reduces the number of separate measurement signals needed while maintaining high sensing resolution through accumulated measurements.
3Reliability
If dedicated measurement signals are transmitted separately, then channel estimation accuracy improves, but resource utilization efficiency deteriorates
Solution Approach 1:
Data payloads are designed to serve dual purposes: carrying information data and providing reliable channel estimation measurements. The use of multiple data payloads with different precoding settings ensures accurate channel estimation while improving resource utilization by eliminating separate dedicated measurement signal transmissions.
Data Source
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AI summary
A method is disclosed of a transmitter configured to transmit a physical layer packet comprising a plurality of measurement signals for channel estimation. The method comprises configuring the transmitter to use different precoding settings for at least two of the plurality of measurement signals for channel estimation, and transmitting the physical layer packet. In some embodiments, at least one of the plurality of measurement signals for channel estimation occurs outside of a preamble of the physical layer packet (e.g., in a midamble). A method of a corresponding receiver is also disclosed. The method comprises receiving the physical layer packet comprising a plurality of measurement signals for channel estimation, wherein different precoding settings are used for at least two of the plurality of measurement signals for channel estimation, and performing channel estimation based on the measurement signals for channel estimation.