Abstract:

When the femotocell technique is utilized in the orthogonal frequency division multiple access (OFDMA) system, the interferences will be increased and the traditional capacity model will not be available. Two kinds of radio resource allocation mechanisms, cochannel and orthogonal, are analyzed for the coexistence of femtocell and macrocell, where the signaltointerference ratio distribution is derived and the closedform outage probability expressions and the corresponding theoretical capacity formulations are presented as well. Analysis and simulation results show that the interference between femtocell and macrocell for the cochannel scenario is worse than that for the orthogonal scenario; however, the throughput in the cochannel scenario is better than that in the orthogonal if the interference can be coordinated.

Key words: femtocell, interference coexistence, orthogonal frequency division multiple access system capacity