1. Interference Alignment: A Surprising Result One can achieve full MG without co-operation!2 2
Can transmit 4 streams of data with a multiplexing gain of 2 2 2 2 3 3 2 3 2
Can transmit 4 streams of data with a multiplexing gain of 4

2. Please see Page 17, subsection IV-B, in the report
M. A. Maddah-Ali, A. S. Motahari, and Amir K. Khandani, "Communication over MIMO X Channels:
Signaling and Multiplexing Gain", Technical Report, UW-E&CE # “Overlap of the interference terms
at the receivers’ side”, which introduces the idea of ‘’Interference Alignment” for the first time.
Next page summarize the contents of this subsection: