Measurement Based Evaluation of Interference Alignment on the Vienna MIMO Testbed

Interference Alignment (IA) is a linear precoding scheme for the K-user interference channel with high signal to noise ratio. Ideally, interference is completely suppressed and each user is able to achieve half of the single-user multiple-input multiple-output (MIMO) degrees of freedom. We use the Vienna MIMO testbed to evaluate the feasibility of IA in realtime1, in a heterogeneous outdoor to indoor and indoor to indoor scenario representative of an urban scenario. We evaluate the accuracy of alignment and provide benchmarks for typical delays in such a setup.