Dynamic subcarrier allocating algorithm for multi-band OFDM-UWB system
Zhihua Bao · Journal of Circuits and Systems · 2011
The power spectral density of ultra-wideband system is strictly limited,and the transmission power is one of the main performances to be taken into consideration.In this paper,a new adaptive subcarrier allocating algorithm is proposed for multiuser multiband orthogonal frequency division multiplexing ultra-wideband system.This algorithm dynamically assigns the subcarriers and bits for multiuser to minimize the total transmission power for a given bit error rate and user's data rate.It avoids the effect of deep fading subcarriers on the user effectively by perfectly dynamical allocating subcarriers,which is sub-optimal and includes subcarrier selecting based difference,bit allocating and subcarrier optimizing between users with the same bits.Simulation results show that the algorithm has more than 1 dB gain over other algorithms in power per bit and bit error rate under the same complexity.