Computer Science – Computer Science and Game Theory
Scientific paper
2008-06-23
Computer Science
Computer Science and Game Theory
To appear in proc. IEEE PIMRC 2008 - Workshop in Emerging Network Perspectives in Multiuser and Cooperative MIMO (NWMIMO). 5 p
Scientific paper
We present two interference alignment techniques such that an opportunistic point-to-point multiple input multiple output (MIMO) link can reuse, without generating any additional interference, the same frequency band of a similar pre-existing primary link. In this scenario, we exploit the fact that under power constraints, although each radio maximizes independently its rate by water-filling on their channel transfer matrix singular values, frequently, not all of them are used. Therefore, by aligning the interference of the opportunistic radio it is possible to transmit at a significant rate while insuring zero-interference on the pre-existing link. We propose a linear pre-coder for a perfect interference alignment and a power allocation scheme which maximizes the individual data rate of the secondary link. Our numerical results show that significant data rates are achieved even for a reduced number of antennas.
Chaufray Jean-Marie
Debbah Merouane
Lasaulce Samson
Perlaza Samir Medina
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