A simple bit and power allocation algorithm for OFDM systems

OFDM and adaptive transmission are two most promising techniques for next generation high data rate mobile communication systems. In this paper, we combine the two techniques and propose a simple and computational efficient adaptive bit and power allocation algorithm for broadband OFDM system. In the algorithm, first the bit and corresponding power are allocated to each subcarrier according to SNR channel condition in the receiver, then the residual power is allocated to the subcarrier that can use the most efficiently. In this way, this algorithm is efficient while calculation is less complex. Simulation results show the advantages of the proposed algorithm over those of equal bit loading algorithm and original SNR based adaptive allocation method.