Abstract: Adaptive OFDM (Orthogonal Frequency Division Multiplexing) system can allocate the data rates and transmit power among subcarriers adaptively. This article proposes the adaptive algorithm based on equal SNR (Signal Noise Ratio), and applies it in adaptive OFDM system. In frequency selective fading channel, compared with the traditional OFDM system based on equal power allocation, the system outperforms in BER (Bit Error Ratio) performance.

Key words: adaptive OFDM, minimum average BER, adaptive algorithm

摘要： 提出了一种基于最小平均误码率的自适应预处理算法，并将该算法应用于自适应 OFDM 系统，在频率选择性衰落信道条件下，与等功率分配的 OFDM 系统相比，误比特性能有了很大程度的提高。

关键词: 自适应OFDM, 最小平均误码率, 自适应预处理算法