Degrees of Freedom Region of the MIMO X Channel

Date Added: Jan 2010
Format: PDF

There is recent interest in the degrees of freedom1 of distributed Multiple-Input Multiple-Output (MIMO) communication systems. The distributed MIMO perspective is relevant not only for wireless networks where the nodes are equipped with multiple antennas but also for networks of single-antenna nodes which may achieve MIMO behavior through message sharing and collective relaying by clusters of neighboring nodes. While time, frequency, and space all offer degrees of freedom, spatial dimensions are especially interesting for how they may be accessed with distributed processing.