Zero-Forcing Precoding in the Measured Massive MIMO Downlink: How Many Antennas Are Needed?

Performance Analysis for Massive MIMO Downlink with Low Complexity Approximate Zero-Forcing Precoding

Zero-forcing (ZF) precoding plays an important role for massive MIMO downlink due to its near optimal performance. However, the high computation cost of the involved matrix inversion hinders its application. In this paper, we adopt the first order Neumann series (NS) for a low-complexity approximation. By introducing a relaxation parameter jointly with one selected user’s interference to others...

A Downlink Max-SINR Precoding for Massive MIMO System

To acquire the maximal array gain and mitigate the impact of pilot contamination, the downlink precoding algorithm on Max-SINR criterion was investigated and improved for Massive MIMO system. The objective function assured to maximize the utilization rate of the transmission power under the condition that SINR is not lower than the desired threshold. The Lagrangian function was deduced accordin...

Linear Precoding Performance of Massive MU - MIMO Downlink System

Nowadays, multiuser Multiple-In Multiple-Out systems (MU-MIMO) are used in a new generation wireless technologies. Due to that wireless technology improvement is ongoing, the numbers of users and applications increase rapidly. Then, wireless communications need the high data rate and link reliability at the same time. Therefore, MU-MIMO improvements have to consider 1) providing the high data r...

Hierarchical Precoding for the Network MIMO Downlink

Over the last few years, network MIMO or distributed MIMO has gained enormous interest in research and meanwhile is a candidate for future communication systems. However, existing techniques handling the multi-user interference, e.g., linear preequalization (LPE) or TomlinsonHarashima precoding (THP), assume full cooperation between the base stations. This might cause significant signaling over...

Precoding Schemes for MIMO Downlink Transmission