Abstract
Device-to-device (D2D) communication underlying cellular networks has been proven to increase system throughput and to achieve higher spectral efficiency in future fifth generation wireless networks. However, resource sharing under D2D communications may cause serious mutual interferences among DUE pairs and cellular users. In this thesis, we formulate the downlink resource allocation problem and propose joint channel and power allocation algorithms to manage the resource and achieve a maximum sum rate. Using the maximum clique and the minimum clique cover method respectively in the proposed channel allocation algorithms, we make as many DUE pairs reusing the channel pre-allocated to cellular users as possible. After the channel is assigned to DUE pairs, we determine the transmitted power for both the base station and the transmitters of DUE pairs according to the feasible power region. Meanwhile, the signal-to-interference-plus-noise requirements for both cellular users and DUE pairs are guaranteed. Simulation results show that our proposed algorithms not only is superior in terms of the number of serving DUE pairs, but also maintain the higher system sum rate, than the compared method.