What is precoding matrix?
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.
What is precoding codebook in LTE?
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.
What is precoding matrix indicator in 5g?
This is a E-UTRA parameter related to MIMO feedback for some of the E-UTRA transmission modes. The precoding feedback is used for channel dependent codebook based precoding and relies on UEs reporting the desired PMI (Precoding Matrix Indicator).
What is the linear precoding?
Linear Precoding (LP), also simply called Beamforming (BF), is a particular subclass of transmission schemes that serve multiple users at a time. LP/BF are commonly suboptimal but have a low complexity.
What is codebook mode in 5G?
Putting it other way, Codebook is a kind of matrix (a matrix having complex value elements) that transform the data bit (PDSCH) to another set of data that maps to each antenna port.
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 the precoding matrix indicator in 3GPP evolved?
36.213 3GPP Evolved Universal Terrestrial Radio Access (E-UTRA) Physical layer procedures Release 16 TS For transmission modes 4, 5 and 6, precoding feedback is used for channel dependent codebook based precoding and relies on UEs reporting precoding matrix indicator (PMI).
What is the precoding matrix indicator in E-UTRA?
Precoding Matrix Indicator. This is a E-UTRA parameter related to MIMO feedback for some of the E-UTRA transmission modes. The precoding feedback is used for channel dependent codebook based precoding and relies on UEs reporting the desired PMI (Precoding Matrix Indicator).
How is the PMI-precoding matrix indicator related to MIMO feedback?
PMI – Precoding Matrix Indicator. This is a E-UTRA parameter related to MIMO feedback for some of the E-UTRA transmission modes. The precoding feedback is used for channel dependent codebook based precoding and relies on UEs reporting the desired PMI (Precoding Matrix Indicator).
How is the precoding matrix determined for each UE?
The precoding matrix for each UE is determined by the eNB—the scheme is much simpler than for the downlink since the eNB can directly estimate the MIMO channel for all eNBs from uplink reference signals. The precoding matrix is indicated to each UE using the same codebook-based scheme as for uplink SU-MIMO.
https://www.youtube.com/watch?v=lD_vEClWagQ