Multi-Link WiFi CSI Calibration for High-Resolution Ranging

The patent segments the sensing and ranging function across multiple narrow bandwidth links instead of using a single large bandwidth channel. Each link operates independently with its own CSI collection and calibration process, allowing the system to achieve high resolution through aggregation of multiple segmented measurements rather than requiring a single complex high-bandwidth channel.

The patent merges CSI data from multiple narrow bandwidth links through calibration and aggregation to achieve the equivalent resolution of a large bandwidth channel. By combining the calibrated CSI measurements from multiple links, the system reconstructs high-resolution delay profiles without requiring any single link to operate at high bandwidth, thus reducing complexity while maintaining precision.

The patent divides the sensing function across multiple reliable narrow-bandwidth links that are more likely to be available in dense deployments. Instead of relying on a single large bandwidth channel that may be unavailable or interfered with, the system segments the measurement task across multiple smaller, more reliable links, each of which can be independently calibrated and aggregated to achieve the required delay tap distinction.

The patent introduces channel propagation models as intermediaries to bridge the gap between narrow bandwidth measurements and high-resolution sensing requirements. These models predict CSI data across the bandwidth, allowing the system to infer high-resolution characteristics from lower-resolution measurements taken on reliable narrow-bandwidth links, thus maintaining measurement precision without requiring direct access to large bandwidth channels.

The patent combines calibrated CSI measurements from multiple narrow bandwidth links to achieve high-resolution sensing. By merging the information from multiple independent narrow-bandwidth measurements, the system reconstructs delay profiles with sufficient resolution for accurate sensing and ranging, thus maintaining measurement precision while relying on reliable narrow-bandwidth channels.

The patent changes the parameters of the measurement process by collecting CSI across multiple frequency links and time instances, then using channel propagation models to predict and calibrate the data. This parameter transformation approach allows narrow bandwidth measurements to be converted into high-resolution sensing information through mathematical processing and model-based prediction, effectively compensating for the limited bandwidth of individual links.