A New Subcarrier and Power Allocation Algorithm Based on Statistical Information in Multiuser OFDM System

In this paper, multiuser waterfilling theory applied to subcarrier and power allocation in orthogonal frequency division multiplexing (OFDM) system is researched. Note that the traditional scheduling algorithm making use of the channel status information(CSI) feedback needs broad control channel to transfer the frequent CSI in multipath Rayleigh fast fading channel, which is often impractical or inefficient, we propose a resource allocation algorithm based on tap correlation information(TCOI), which is characterized by channel statistical information. The algorithm is designed to utilize the TCOI to reduce the channel feedback. Because the optimal resolution is high nonlinear, we convert the proposed algorithm into discrete method to achieve lower algorithm complexity. The simulation result shows that the proposed algorithm has tiny reduction in overall system capacity, but much lower complexity of algorithm and small channel feedback comparing to the traditional scheduling algorithm based on CSI, what´s more it outperforms greatly channel independent scheduling basing on pathless in fast Rayleigh fading channel.