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| In this paper, a novel inter-cell frequency planning scheme and distributed power allocation algorithm are conceived for relay-aided OFDMA cellular networks. The employed smart Relay Station (RS) is able to broadcast pilots to its connected Base Station (BS) and serving User Equipments (UEs) to evaluate the channel quality as well as to manage its accessed UEs. In order to reuse the subchannel among RSs in the RS-UE links, two different mechanisms are proposed to construct the global interference matrix, which interprets the reuse problem into a graphic based one. We further develop a Graphic Based Reuse Algorithm (GBRA) to solve the reuse problem. Furthermore, a distributed power allocation scheme is proposed for allocating the powers in the BS-RS and RS-UE links respectively aiming to maximize the system throughput under the UEs' rate constraints. Simulation results demonstrate that the proposed reuse scheme improves the system throughput significantly, through it results in a declined Signal Interference Noise Ratio (SINR). Meanwhile, the proposed power allocation algorithm further improves the system throughputs. |
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| Keywords:OFDMA; Relay Networks; Graph Theory; Power Allocation; Spectrum Reuse |
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