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In recent years, there has been a strong interest in incorporating multihop relaying strategies in cellular systems to develop Multihop Cellular Networks (MCNs). This increases the network capacity, improves its coverage and reduces transmit power levels. In this paper, a joint relay selection and resource allocation algorithm is proposed to maximize the throughput. The proposed algorithm is evaluated and compared with three other existing algorithms. Simulation results show that our proposed algorithm achieves at least 30% more throughput than those of others when there are 10 active users in the cell.