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Robust design of powerline carrier communication (PLCC) system is essential due to great advances in utilization of PLCC technology across diverse applications. Powerline communication system design is complicated by noise conducted by the media and variable channel loss and signal propagation. The coupling circuit is a critical element of a PLCC system. Traditional methods for robust design, such as Monte Carlo, may require performing prohibitive number simulations. This paper proposes a computationally efficient, system-level response surface modeling (SRSM) method for the robust design of coupling circuit and PLCC system. The SRSM method is fully automated and its performance can be directly compared with the Monte Carlo simulation method. The results obtained agree closely with those of traditional Monte Carlo method, while significantly reducing the required number of simulations.