What are antenna ports in LTE?

An antenna port is generally used as a generic term for signal transmission under identical channel conditions. For each LTE operating mode in the downlink direction for which an independent channel is assumed (e.g. SISO vs. MIMO), a separate logical antenna port is defined.

How many ports are there in antenna?

There is one resource grid per antenna port. The antenna ports used for transmission of a physical channel or signal depends on the number of antenna ports configured for the physical channel or signal as shown in Table 5.2….Antenna Port.

Reference Signal Type	Associated Antenna Ports
Positioning Reference Signal	p = 6

What is an antenna port in 5g?

An antenna port is defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna port is conveyed. Each Antenna ports carries its own resource grid and a specific set of reference signal in the grid.

What is CRS port in LTE?

The downlink cell specific reference signal can be used for the following purposes: Cell search and initial acquisition. Downlink channel estimation for coherent demodulation/detection at the UE. …

What is a codebook in LTE?

Abstract: The codebook based precoding is a promising technology adopted by Long Term Evolution (LTE), which fixes a common codebook comprising a set of vectors and matrices at both the transmitter and the receiver.

How is transmission mode determined in LTE?

In LTE, usually they use multiple Antenna for downlink (at least from Category 3 UE and higher), meaning that eNode (Network) has use multiple Tx Antenna and UE use multiple Rx antenna. In LTE, they give a special name for each of the way of transmission and it is called ‘Transmission Mode’.

What is CSI RS port?

CSI-RS ports are the number of radiating elements (or group of antennas) of an active antenna unit. So there can be 4×4 MIMO with 8 CSI-RS ports with 16 CSI-RS ports or with 4 CSI-RS ports. Are not related with each other. Only conditions is that MIMO layers cannot be higher than CSI-RS ports.

What is layer mapping in LTE?

(2) Layer Mapping : This is the process where each codeword is mapped to mapped to one or multiple layers. Refer to Layer Mapping page. (3) Precoding : This is process where the layer data are allocated to multiple antenna ports (logical antenna ports in this stage).

What is Ant in cable?

ANT-IN – is where you connect your antenna (not included). The ANT-OUT, HDMI, and RCA ports (Red, Yellow and White ports) are your video output options. Ant-out uses an RF or coaxial cable (not included in this particular bundle) and has the lowest video output quality.

What is the duration of 1 subframe in LTE?

In LTE, DL and UL transmissions are organized into radio frames of 10 ms each. Each frame is divided into ten equally sized subframes. The duration of each subframe is 1 ms. Moreover, each subframe is further divided into two equally sized time slots, that is, each slot is 0.5 ms.

What CRS gain?

“Sets the DL power of the Cell specific Reference Signal (CRS) relatively a reference level defined by the power of the PDSCH type A resource elements. If crsGain is +3dB, the CRS power is 3dB higher than that of a PDSCH type A resource element. The settings crsGain=4.77db and 6dB are mapped to 3dB.

What is a Precoder in LTE?

Precoding is a technique that exploits transmit diversity by weighting the information stream, i.e. the transmitter sends the coded information to the receiver to achieve pre-knowledge of the channel. The receiver is a simple detector, such as a matched filter, and does not have to know the channel state information.