An improved bit and power allocation algorithm for OFDM system

Each channel of OFDM system has its own fading characteristic. We can not make a better use of system resources when the same modulation is used. In this paper, we propose an improved bit and power allocation algorithm for single user OFDM system under limited system capacity and bit error rate. When required bit error rate BER is less than 10^-3, proposed algorithm reduces the sending power almost 2.5 dB compared with Chow algorithm. It also significantly reduces the time consuming under the constraint of system capacity. The simulation results show the effectiveness of this algorithm.