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中文摘要：
提出了自适应频域判决-反馈迫零均衡的OFDM系统。在接收端引入判决-反馈迫零均衡，并对承受严重衰落的子载波信号进行频域交织和前向纠错，使得各子载波具有相近的信噪比，从而对所有子载波采用相同的调制编码方式。因此，系统复杂性比自适应比特加载OFDM系统显著降低。将所提方案用于IEEE802．16dWireless-MANOFDM系统，多径瑞利衰落信道下的仿真结果表明，该方案可以有效抵抗频率选择性衰落。
英文摘要：
An adaptive frequency-domain zero-forcing decision-feedback equalization OFDM system is proposed by introducing a zero-forcing decision-feedback equalizer in the receiver. With using frequency-domain interleaving as long as FEC coding, most of the sub-carriers＇ SNR can be recovered to the average level. Thus, the same modulation scheme can be used for all of the sub-carriers, the complexity is reduced and much lower than that of adaptive bit loading OFDM systems. The proposed scheme is applied to IEEE802. 16d Wireless-MAN OFDM system. The simulations results under multi-path Rayleigh fading channel demonstrate that the new scheme can effectively overcome frequency-selective fading.
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