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This paper proposes a power allocation scheme with co-channel allocation fora femto base station (BS) that maximizes the sum-rate of its own femto mobilestations (MSs) with a constraint that limits the degradation of quality ofservice (QoS) of macro MSs. We have found a closed-form solution for the upperlimit on the transmission power of each sub-channel that satisfies theconstraint in a probabilistic sense. The proposed scheme is practical since ituses only the information easily obtained by the femto BS. Moreover, our schememeets the constraint with minimal degradation compared to the optimal sum-rateof the femto MSs achieved without the constraint.

Sum-rate maximization of OFDMA femtocell networks that incorporates the QoS of macro mobile stations