Communication over MIMO X Channel: Signalling and Performance Analysis
Mohammad Ali Maddah-Ali, Seyed Abolfazl Motahari · 2006
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 (non-cooperative scenario). This system can be considered as a combination of two broadcast channels (from the transmitters point of view) and two multi-access channels (from receivers point of view). Taking advantage of both perspectives, two signaling schemes for such a scenario is developed. In these scheme, some linear filters are employed at the transmitters and the receivers which decompose the system into either two non-interfering multi-antenna broadcast sub-channels or two non-interfering multi-antenna multi-access sub-channels. By using the decomposition schemes,