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What is antenna port in LTE?
The LTE standard defines what are known as antenna ports. These antenna ports do not correspond to physical antennas, but rather are logical entities distinguished by their reference signal sequences. Correspondingly, a single antenna port can be spread across multiple transmit antennas (UE-RS port 5, for example).
What is meant by Port in antenna?
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.
Which antenna port ports is are UE specific which is are used for beamforming to a single UE using all physical antennas?
port 5
As the UE requires only the UE specific reference signal for demodulation of the Physical Downlink Shared Channel (PDSCH), the data transmission for the UE appears to have been received from only one transmit antenna, therefore, this transmission mode is described as “single-antenna port, port 5”.
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.
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 layer mapping in 5G?
(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 CSI-RS in 5G?
Channel State Information Reference Signal (CSI-RS) is a reference signal (RS) that is used in the Downlink (DL) direction in 5G NR, for the purpose of Channel Sounding and used to measure the characteristics of a radio channel so that it can use correct modulation, code rate, beam forming etc.
What is the purpose of CSI-RS in 5G?
CSI-RS refers to channel state information reference signal and these signals are downlink only signal. It is used for DL CSI acquisition. 5G NR standard allows high level of flexibility in CSI-RS configurations, a resource can be configured with up to 32 ports.
What is codeword in 5G?
The output of a coding chain is a codeword. 5G supports transmission of up to 8 layers to a single user on the downlink. This means that there can be up to eight streams transmitted in parallel. The coded data is then mapped to the physical downlink shared channel or PDSCH.
What is LTE Layer Mapping?
How is an antenna port different from a physical antenna?
1 Antenna port is logical concept, not a physical concept (meaning ‘Antenna port’ is not the same as ‘Physical Antenna’) 2 Each Antenna port represents a specific channel model 3 The channel that is transmitted by a specific antenna port can be done by using the reference signal assinged fort the port (This is why each antenna port has its
How are antenna ports used in LTE network?
The LTE standard defines what are known as antenna ports. These antenna ports do not correspond to physical antennas, but rather are logical entities distinguished by their reference signal sequences. Multiple antenna port signals can be transmitted on a single transmit antenna ( C-RS port 0 and UE-RS port 5, for example).
Is the antenna port the same as the L1?
For the same reason, the concept of antenna port is used in the 5G NR and it follows the same principles as in 4G LTE. The term “antenna port” is a logical concept related to physical layer (L1), and not the physical one like RF antenna which is visible on tower.
What’s the difference between antenna port and 5G NR?
This answer is for LTE standard, not 5G NR. However I do believe that the basic concept does not change since. 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.