Application Scenario Each user is equipped with N t transmit antennas WAR (Wireless Access Router) is equipped with N r receive antennas

System’s Architecture VBR media Encoder VBR media Decoder V(t) Loss-affected MAC queue

Physical layer configuration D.N.Tse, P.Viswanath, L.Zheng,’’ Diversity-Multiplexing Tradeoff in Multiple-Access Channels’’, IEEE Tr.on Inform. Theory, vol.50, no.9, pp.1859, 2004.

Diversity-vs-Multiplexing-vs-SDMA tradeoff The best diversity-multiplexing curve attainable by the MIMO MAC channel Piecewise linear curve i-th average Frame Error Rate at the MAC layer

MIMO MAC Packet loss MIMO MAC service rate

Multiple User Systems Dynamic resource allocations Backbone Access Point Client Device Joint optimization MISO System MIMO System

Optimization problem a1a1 S1S1 a2a2 S2 aMaM SMSM...  t  Wireless channel... 7 Weights MISO Systems - Multiplexer Queue weights depending on the Class of Service of the different input streams

8 The radiated energies and the system state partitioning for the jointly optimal scheduler