What is LTE precoding?

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.

Why precoding is used 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.

What is the difference between beamforming and precoding?

A third answer is that beamforming refers to a single-user transmission with one data stream, such that the transmitted signal consists of one main-lobe and some undesired side-lobes. In contrast, precoding refers to the superposition of multiple beams for spatial multiplexing of several data streams.

What is MRT precoding?

The MRT precoding scheme introduces a designed precoding matrix operation to mitigate the interference and then to obtain the gain with the MRC. In contrast to the existing BD-type precoding, the main focus of this work is motivated by the low complexity and the better performance.

What best defines massive MIMO?

Massive MIMO (massive multiple-input multiple-output) is a type of wireless communications technology in which base stations are equipped with a very large number of antenna elements to improve spectral and energy efficiency.

What is zero forcing beamforming?

Zero-forcing Beamforming (ZF-BF) is a spatial signal processing in multiple antenna wireless devices.

Does 5G have MIMO?

MIMO is one of the key enabling techniques for 5G wireless technology, providing increases in throughput and signal to noise ratio. MIMO – Multiple Input Multiple Output is well established for mobile communications as well as many other technologies.

What is the difference between MIMO and massive MIMO?

MIMO is between two devices (e.g. base station and mobile station or AP and client), while Massive MIMO is simultaneous communication between a base station and multiple clients. It essentially merges the concept of beamforming with MIMO to minimize interference between devices.

What is zero forced MIMO?

Zero-forcing (or null-steering) precoding is a method of spatial signal processing by which a multiple antenna transmitters can null the multiuser interference in a multi-user MIMO wireless communication system.

Why zero-forcing receiver is so called?

The name zero-forcing corresponds to bringing down the intersymbol interference (ISI) to zero in a noise-free case.