Bit and Power Allocation Algorithm for OFDM System
OFDM系统功率和比特分配算法研究

The maximization of data rate under the constraint of total transmit power and bit error rate is a considerable issue in OFDM system. Recognizing that the number of bits on each subcarrier must be a discrete number for real systems, this paper proposed two bit allocation algorithms which are modified greedy algorithm and water filling level binary searching algorithm. Simulation results show that the complexity of modified greedy algorithm is 10% of that of greedy algorithm and 5-7 iterations are enough for 0.5% data rate loss when SNR is above 10dB.