Howtosignalprocessing
- What is WiFi CSI data?
- How is channel state information obtained?
- Can the channel state information be used for wireless sensing?
What is WiFi CSI data?
In wireless communications, channel state information (CSI) is the known channel properties of a communication link. This information describes how a signal propagates from the transmitter to the receiver and represents the combined effect of, for example, scattering, fading, and power decay with distance.
How is channel state information obtained?
Channel State Information at the Transmitter (CSIT) is downlink CSI known at the transmitter. CSIT can be known by estimating uplink signals in [[time division duplex| time division duplex (TDD) systems] and receiving feedback signaling from users in frequency division duplex|frequency division duplex (FDD) systems].
Can the channel state information be used for wireless sensing?
CSI captures how wireless signals travel through the surrounding environment, so it can also be used for wireless sensing purposes. This dissertation presents how to improve WiFi sensing and networking with CSI.
