Two-Way Fading Channels: Training Protocol and Diversity-Multiplexing Performance

Two-way communication over a fading wireless channel requires that nodes on both ends of the link acquire channel state information in order to successfully receive coherent signals. When the channel in question is symmetric and slow fading, channel state information at the receiving node can be used to perform power control when the same node becomes the transmitter. In this work, we propose and analyze a novel two-way training protocol that uses power control to improve diversity-multiplexing performance while saving overhead by exploiting channel symmetry.