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A robust signal forwarding technique for wireless sensor and mesh networks using semidefinite constraints is proposed. The scheme considers a multiple source destination scenario where a set of relays assists forwarding signals from sources to destinations. In our work we consider a realistic environment where actual channel state information (CSI) available to the relays are in error. We propose to optimize the relay transceiver within a worst-case performance optimization framework using semidefinite constraints. Simulations demonstrate that in the presence of imperfect CSI, the proposed scheme outperforms a non-robust scheme.