This paper presents an efficient link quality prediction method for OFDM systems. It is based on effective SINR mapping (ESM) approach. Being different from conventional ESM methods, the novel scheme employs constrained linear averaging to multiple instantaneous channel indicators. Its computation complexity is lower than conventional ones. Because there is no two-step mapping processing with invertible mapping functions. Its memory requirement is also much less because no additional off-line ESM look-up table is required. Finally, its performances in terms of BLER and throughput are evaluated in link adaption. Simulation results show that it is efficient.