We prove a variety of theorems about stationary set reflection and concepts related to internal approachability. that an implication Fuchino-Usuba relating version Strong Chang's Conjecture cannot be reversed; strengthen simplify some results Krueger forcing axioms approachability; other are sharp. also adapt ideas Woodin unify many arguments in the literature involving preservation axioms.

In this letter, we discuss the problem of receive antenna selection in the downlink of multiuser multiple-input multiple-output (MIMO) systems with Tomlinson-Harashima precoding (THP), where the number of receivers is assumed equal to that of transmit antennas. Based on the criterion of maximum system sum-capacity, a per-layer receive antenna selection scheme is proposed. This scheme, which sel...

A new version of Tomlinson-Harashima Precoding (THP) for multiple-input/multiple-output (MIMO) channels with decentralised receivers employing lattice reduction is introduced. The proposed method clearly outperforms linear equalisation and conventional THP and in particular shows full diversity order.

Spatial multiplexing techniques send independent data streams on different transmit antennas to maximally exploit the capacity of multiple-input multiple-output (MIMO) fading channels. Most existing multiplexing techniques are based on an idealized MIMO channel model representing a rich scattering environment. Realistic channels corresponding to scattering clusters exhibit correlated fading and...