Communication Over MIMO X Channels: Interference Alignment, Decomposition, and Performance Analysis

In a multiple-antenna system with two transmitters and two receivers, a scenario of data communication, known as the X channel, is studied in which each receiver receives data from both transmitters. In this scenario, it is assumed that each transmitter is unaware of the other transmitter's data (noncooperative scenario). This system can be considered as a combination of two broadcast channels (from the transmitters' points of view) and two multiple-access channels (from the receivers' points of view). Taking advantage of both perspectives, two signaling schemes for such a scenario are developed. In these schemes, some linear filters are employed at the transmitters and at the receivers which decompose the system into either two noninterfering multiple-antenna broadcast subchannels or two noninterfering multiple-antenna multipleaccess subchannels. The main objective in the design of the filters is to exploit the structure of the channel matrices to achieve the highest mu...

• Type: Journal
• Year: 2008
• Where: TIT
• Authors: Mohammad Ali Maddah-Ali, Abolfazl S. Motahari, Amir K. Khandani
• Keywords: Scenario, Signaling Schemes, TIT 2008, Transmitters