What is meant by channel knowledge? Difference between partial and full?

1. What is CSI in WIFI?
2. What is CSI in MIMO?
3. What is channel gain in wireless communication?
4. How is channel state information calculated?

What is CSI in WIFI?

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.

What is CSI in MIMO?

In a MIMO system, a transmitter with perfect knowledge of the underlying channel state information (CSI) can achieve a higher channel capacity compared to transmission without CSI.

What is channel gain in wireless communication?

Channel Gain or Single-Noise-Ratio (SNR) The channel gain H of a wireless channel (S,R) is defined by: Y= H X + Z, where X is the signal sent by S, Y is the signal received by R and Z ~ N(0,1) is the noise term.

How is channel state information calculated?

Channel state information (CSI) is basically calculated using the pilot signals used during transmission and compared with the received pilot signals, while the SNR reflects the strength of the transmitted signal in respect of the channel noise.