An adaptive subcarrier allocation model for adaptive muhiuser orthogonal frequency division multiplex (OFDM) power-line communication systems is researched after allocation of the system's total power by cellar water-filling under the restrictions for each subcarrier in each OFDM symbol. A new subearrier-group dynamic allocation algorithm was proposed. In typical power-line channel scenarios, the proposed algorithm was compared to the subearrier-group allocation algorithm with only one subcarrier in the group and to the subcarrier by subcarr...