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In this letter we consider resource allocation for OFDMA-based securecooperative communication by employing a trusted Decode and Forward (DF) relayamong the untrusted users. We formulate two optimization problems, namely, (i)sum rate maximization subject to individual power constraints on source andrelay, and (ii) sum power minimization subject to a fairness constraint interms of per-user minimum support secure rate requirement. The optimizationproblems are solved utilizing the optimality of KKT conditions for pseudolinearfunctions.

OFDMA-based DF Secure Cooperative Communication with Untrusted Users