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Wireless & Mobility · Advanced

Channel State Information (CSI)

Detailed per-subcarrier amplitude and phase data describing how a channel affects a signal.

Definition

CSI is measured from training fields and used for beamforming, MIMO decoding, and sensing. Beamforming feedback reports compressed CSI to the transmitter. Changes in CSI over time can reveal motion.

Exam tip

CSI is more detailed than RSSI; it describes every subcarrier.

Related terms