Handling concept drift in Wi-Fi-based localization
AssigneeAerial Technologies Inc.
InventorsQianyu Liu, Negar Ghourchian, Michel Allegue Martinez, Raihan Seraj
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Abstract
Systems and methods are provided for human activity analysis and localization using channel state information (CSI). A streamlined data processing and feature extraction approach that addresses concept drifts for time series data is provided. Data obtained from CSI or any other mechanism is used to estimate the wireless channel between two different wireless nodes (e.g., an access point (AP) and an associated station (STA)), and can be used to train a robust system capable of performing room level localization. A phase and magnitude augmented feature space along with a standardization technique that is little affected by drifts is also used.
Claims17
A method for handling drift in wireless signals, the method comprising:
- collecting channel state information through a transmitter and a receiver of a wireless access point;
- preparing one or more data frames based on the channel state information, wherein preparing the data frames includes noise removal and normalization;
- obtaining one or more statistical properties that are representative for a predefined area of interest;
- and
- leveraging the one or more statistical properties to eliminate outliers from the prepared data frames.
A system for handling drift in wireless signals, the system comprising:
- a wireless access point that collects channel state information through a transmitter and a receiver;
- and
- a cloud server that:
- prepares one or more data frames based on the channel state information, wherein preparing the data frames includes noise removal and normalization;
- obtains one or more statistical properties that are representative for a predefined area of interest;
- and
- leverages the one or more statistical properties to eliminate outliers from the prepared data frames.
A non-transitory, computer-readable storage medium, having embodied thereon a program executable by a processor to perform a method for handling drift in wireless signals, the method comprising:
- collecting channel state information through a transmitter and a receiver of a wireless access point;
- preparing one or more data frames based on the channel state information, wherein preparing the data frames includes noise removal and normalization;
- obtaining one or more statistical properties that are representative for a predefined area of interest;
- and
- leveraging the one or more statistical properties to eliminate outliers from the prepared data frames.
Dependencies are inferred from the claim text.