Cl. Subcarrier Gain basedPower Allocation in Multicarrier Systems

The Orthogonal Frequency Division MuItiplexing (OFDM) transnussIOn scheme is the optimum version of the muIticarrier transmission scheme which has the capability to achieve high data rate transmission. The key issue of OFDM system is the allocation of bit and power over number of subcarriers. In this paper, a new power allocation algorithm based on subcarrier gain is proposed to maximize the bit rate. For OFDM system, the subcarrier gain based power allocation (SGPA) algorithm is addressed and compared with the standard greedy power allocation (GPA). We demonstrate by analysis and simulation that the proposed algorithm greatly reduces the computational complexity and achieves near optimal performance in maximization the bit rate over number of subcarrier.