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In multiuser MIMO systems, the achievable system data rate as well as Quality of Service (QoS) of individual users is limited by the Inter-User Interference (IUI). The interference balancing issue via power allocation can be usually formulated as a non-convex optimization problem which will become more intractable with non-convex QoS constraints. In this paper, the authors focus on the challenging QoS-aware optimal power allocation problem, aiming to maximize the system sum rate and guarantee the users' minimum data rates. As a result, a "Posynomial Approximations based on Single Condensation" (PASC) strategy is proposed which transforms the underlying problem to a series of tractable Geometric Programming (GP) problems through single condensation scheme.
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