OFDMA Measurement Packet Tone Allocation for Wireless Sensing Precision
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Solution Overview
Problem
Existing wireless communication systems face challenges in improving the measurement precision of channel information due to low power spectral density and signal-to-noise ratio, affecting the accuracy of human body action sensing in wireless sensing technology.
Innovation Solution
A method for sending measurement packets using orthogonal frequency division multiple access (OFDMA) where a first wireless device sends a trigger frame to second wireless devices, indicating specific tones or resource units for measurement packet transmission, allowing each device to occupy only a portion of the uplink transmission bandwidth, thereby enhancing power spectral density and measurement precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a station sends NDP frame occupying all tones of the bandwidth under total power constraint, then the transmission can be completed, but the power spectral density on each tone is low and signal-to-noise ratio at receive end is low
Solution Approach 1:
The patent divides the bandwidth into multiple subbands and allocates different subsets of tones to different stations for NDP transmission. Instead of one station occupying all tones, multiple stations each occupy a portion of the total bandwidth, which increases the power spectral density on each assigned tone while maintaining overall system efficiency.
Solution Approach 2:
The patent allows multiple stations to transmit NDP frames simultaneously on different tone subsets rather than requiring one station to use the entire bandwidth. This partial utilization of bandwidth by multiple devices improves the power spectral density for each transmission while enabling parallel measurements.
2Measurement precision
If a station sends NDP frame occupying all tones of the bandwidth, then the transmission can be completed, but the signal-to-noise ratio at receive end is low
Solution Approach 1:
The patent segments the frequency bandwidth into multiple subbands with different tone subsets assigned to different stations. This segmentation reduces noise interference for each individual transmission by concentrating power on fewer tones, thereby improving the signal-to-noise ratio at the receive end for each NDP frame.
3Measurement precision
If multiple stations send NDP frames simultaneously on different tones, then the power spectral density is improved, but the device complexity increases
Solution Approach 1:
The patent employs a pre-configured tone subset mapping where each station is assigned specific tone subsets in advance. The access point maintains a predefined mapping between stations and tone subsets, which simplifies the real-time allocation process and reduces device complexity while enabling multiple stations to transmit simultaneously with improved power spectral density.
Data Source
AI summary
A method for sending a measurement packet and a communication apparatus. The method includes: a first wireless device sends a trigger frame, where the trigger frame is used to trigger a plurality of second wireless devices to send measurement packets in an orthogonal frequency division multiple access (OFDMA) manner; and the first wireless device receives the measurement packets sent by the plurality of second wireless devices in the OFDMA manner. Based on the method, the measurement packet sent by each second wireless device occupies only some tones of an uplink transmission bandwidth. This improves power spectral density of the measurement packet and improves precision of measuring channel information by the first wireless device.