Subcarrier Allocating Algorithm in MB-OFDM UWB System

This paper focuses on the subcarrier allocation for multi-user in multi-band orthogonal frequency division multiplexing ultra-wideband (MB-OFDM UWB) system. A novel allocating algorithm is proposed to minimize the total transmission power subjective to a given bit error rate (BER) and user's data rate. The algorithm is divided into three parts, cluster selection, the bit allocation and adjustment of cluster-allocation results. The clustering scheme is used to reduce the complexity of the algorithm. Simulation results show that the algorithm has more than 1 dB gain over other algorithms in power per bit and bit error rate.