What is channel state information reference signal?

What is channel state information reference signal?

CSI-RSChannel State Information Reference Signal is the Channel State Information Reference Signal and is used by the UEUser Equipment (e.g. cell phone) to estimate the channel and report channel quality information (CQI ) to the base station.

Which channel is used for downlink scheduling?

1 Dynamic downlink scheduling. The base station schedules downlink transmission on PDSCH dynamically using DCI Format 7-1A to 7-1F.

What is channel state information and its importance in communication?

In wireless communications, channel state information (CSI) refers to 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 many channels are there in LTE?

3.3. The MAC layer uses the services offered by the physical layer in terms of using the transport channels. The LTE transport channels are: Broadcast Channel (BCH), Downlink Shared Channel (DL-SCH), Paging Channel (PCH), Multicast Channel (MCH), Uplink Shared Channel (UL-SCH), and Random Access Channel (RACH).

Which of the channel is used for sending scheduling information?

Physical Uplink Control Channel (PUCCH) : The Physical Uplink Control Channel, PUCCH provides the various control signalling. These signalling are known as Scheduling request, Downlink data ACK/NACK and CQI information.

How to find out the average channel capacity?

Taking the average of (11.71), the average channel capacity is: where pD ( x) is the probability density defined in (11.44) with unit variance, σmdl is the STD of overall MDL, and the constant χ is determined by the constraint: (11.73)χ = ρt ∫ + ∞−∞exp(σmdlx)pD ( x) dx.

Is there an analytical expression for the channel capacity?

There is no known analytical expression for the capacity (11.72) except in the limit of very large D. Numerical integration of (11.72) may be employed to find the channel capacity. For fibers with a large number of modes, MDL is log-semicircle distributed, and the constant χ becomes

Which is the SNR of a channel realization?

The SNR ρt is the mean (statistical average) SNR, and the factor χ given by (11.73) can be interpreted as the ratio of the mean SNR to the mean gain of the channel. The product χexp(σmdlx) in (11.72) can be interpreted as the SNR of a channel realization with normalized gain x.

Which is factor normalizes the channel gain to unity?

The factor χ, given by (11.73), normalizes the overall gain to unity, as measured on a linear scale. For a system with MDL, the channel gains are not constant, but are random variables. The SNR ρt is the mean (statistical average) SNR, and the factor χ given by (11.73) can be interpreted as the ratio of the mean SNR to the mean gain of the channel.