Outage-Minimization Power and Spectrum Allocation for Terahertz Communications Systems

We propose joint transmit power and spectrum allocation schemes for terahertz (THz) communication systems with multi-connectivity technologies to overcome random path blockage effects and molecular absorption losses. The proposed approaches focus on quality of service (QoS) guarantees for instantaneous throughput fluctuated by the blockage dynamics and enhancement of the average total system throughput over time. To this end, a sum-of-outage-probability minimization problem and a geometric mean maximization problem for the throughput are formulated for the former and latter concepts, respectively. Moreover, a regularized sum-of-outage-probability minimization problem in which a regularizer suppresses throughput losses is formulated to deal with both the QoS requirement and the throughput enhancement. Stochastic learning and convex optimization mechanism are introduced to solve those problem. Numerical results confirm that the proposed approaches show the better tradeoff between the outage probability and the total system throughput than the conventional approaches.