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S. Schwarz:
"Signal Outage Optimized Beamforming for MISO TWDP Fading Channels";
Talk: IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Bologna; 09-09-2018 - 09-12-2018; in: "Proceedings of the IEEE International Symposium on Personal, Indoor and Mobile Radio Communications", (2018), 1 - 6.

We consider beamforming in multiple-input single-output wireless communications under the assumption that the channel is composed of two dominant specular components plus diffuse background scattering. Assuming unknown phases of the two specular components, and thus uncertainty about the multipath interference conditions (constructive/destructive) at the receiver, we propose a beamformer optimization problem that minimizes the signal outage probability, i.e., the probability that the received signal power falls below a prescribed threshold. The obtained optimization problem is non-convex and thus difficult to solve. We consider local optimization on
the associated Grassmann manifold, using the negative gradient of the outage probability as local search direction for line search. To simplify the optimization, we propose an approximation of the outage probability which facilitates efficient implementation of the line search.

outage probability, beamforming, gradient optimization, TWDP fading, Grassmann manifold

http://dx.doi.org/10.1109/PIMRC.2018.8580817