Marios Kountouris, Dept. of Telecommunications, SUPELEC, France

Location :

Thomson

46 Quai A. Le Gallo
92648 Boulogne
France

Building: Campus, 
Room: Pantheon, 

Abstract :

Multiuser MIMO capacity is well-understood for the uplink and downlink, but not for distributed, or
ad hoc networks. The primary difficulty in such cases is accurately but tractably modeling the 
interference, which we overcome using stochastic geometry. 

In this talk, we consider an uncoordinated ad hoc network in which each multi-antenna transmitter 
sends multiple independent streams to different receivers in a Poisson field of interferers. We 
provide exact expressions and simplified approximations on the outage probability, 
contention density, and transmission capacity for dirty paper coding and linear precoding as a 
means to investigate the fundamental limits of Space Division Multiple Access (SDMA) ad hoc 
wireless networks. First, we show that superlinear capacity scaling with the number of 
receive/transmit antennas N can be achieved using dirty paper coding. To our knowledge this is 
the first capacity result showing better than O(N) scaling in any multiuser MIMO setting. Second, 
we show that much of this gain is lost if linear precoding is employed instead, leading even to 
sublinear capacity growth in the case of single-antenna receivers. Finally, we demonstrate that 
receive antenna array processing is of prime importance, as a means to recover much of the 
loss caused by linear precoding by canceling the increased residual interference and boosting the 
signal power through diversity.

Host :

Theodoros Salonidis