关键词: 衰落信道, 子载波装载, 正交频分复用系统, 多载波调制

Abstract: An adaptive modulation algorithm, minimizing the average BER（bit error rate）while maintaining constant power and throughput in OFDM（orthogonal frequency division multiplexing）system, exploiting the instant prediction estimation channel states information was proposed. According to the simulated results the proposed algorithm could work successfully as well as the optimal bits loading algorithm, while complexity is much lower than the latter, and it is about 5dB superior to the fixed bits loading algorithm at 10-1 BER under fading channel.

Key words: fading channel, bits loading, orthogonal frequency division multiplexing system, multi-carrier modulation