Csi Tool — Atheros

The Atheros CSI Tool is an open-source framework that extracts from commercial Wi-Fi devices equipped with Atheros AR93xx, AR95xx, or QCA988x chipsets. Unlike standard RSSI (Received Signal Strength Indicator), CSI provides fine-grained, per-subcarrier amplitude and phase information for each OFDM (Orthogonal Frequency-Division Multiplexing) subcarrier across multiple transmit-receive antenna pairs.

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