Tag : mimo

The MIMO channel Matrix

The MIMO channel Matrix

The MIMO channel Matrix Consider for a moment in time, on the same frequency and channel modeling as a black box with durable internal components. If we add two completely different input signals is
Interference Limited MIMO Systems for Wimax

Interference Limited MIMO Systems for Wimax

The third assumption—that the background noise is Gaussian and uncorrelated with the transmissions—is especially suspect in a cellular MIMO system. All well-designed cellular systems are by nature interference limited: If they were not, it would
What is Basic behind MIMO for LTE

What is Basic behind MIMO for LTE

MIMO and other transmit spatial diversity scheme is a newer application than receive diversity and has become widely implemented only in the early 2000s. As the signals sent from different transmit antennas interfere with
How SU-MIMO Framework in LTE Rel 8

How SU-MIMO Framework in LTE Rel 8

SU-MIMO is one of the key technologies in LTE Rel 8. There are two major operations under SU-MIMO: transmit diversity and spatial multiplexing. Transmit diversity is an efficient way to improve the reliability of
MIMO Feedback in LTE Rel 8

MIMO Feedback in LTE Rel 8

CSI feedback allows downlink transmission to be adaptively optimized based on the instantaneous DL channel, so that closed loop beamforming and adaptive link adaptation can be enabled to optimize the system performance. The DL
How MU-MIMO Framework in LTE

How MU-MIMO Framework in LTE

MU-MIMO is widely considered a key technology for system capacity improvement in modern wireless networks. In contrast to SU-MIMO, where the spatial multiplexing gain is confined to a single user, MU-MIMO allows multiple users
MIMO Principles

MIMO Principles

The basic mechanism behind MIMO is linear algebra. If we e.g. transmit N (=2) signals S0, S1 via two antennas and receive the signal at M (=2) antennas R0, R1 then we can treat
How to LTE Radio Air Interface?

How to LTE Radio Air Interface?

The state-of-the-art design of the LTE air interface is characterised by OFDMA (DL) and SC-FDMA (UL) together with MIMO. The downlink modulation is based on OFDMA (Orthogonal Frequency Division Multiple Access). OFDMA is a