基于自适应的单载波频域均衡算法

The Single Carrier Frequency-domain Equalization Based on the Adaptation

为了克服频率选择性信道中的码间干扰问题,研究了基于自适应的频域均衡算法。在传统的频域自适应均衡中,由于从时域到频域转换的"块"延迟特性,使所需训练序列的数量很大,降低了系统的通信效率。提出了一种自适应频域均衡算法。通过对训练数据序列在频域进行多次自适应学习,使得频域均衡器系数在此过程中逐渐收敛到最优值。由于在自适应过程中仅使用一段训练序列,而且不再进行信道参数和噪声功率的估计,从而提高了通信效率。仿真结果表明,在准静态信道条件下,该算法取得了较好的频域均衡性能。

In order to overcome the inter-symbol interference in the frequency-Selective fading channel, the frequency-domain equalization based on the adaption has been studied. In the conventional adaptive frequency-do- main equalization, the quantity of the training sequences is large for the reason of ＂block＂ delay when transforming the data from time-domain to frequency-domain. And this deteriorates the communication efficiency. A new adap- tive frequency-domain equalization has been presented. The coefficients of the frequency-domain equalizer have been converged to the optimal values gradually when learning from the same training sequence more times adaptive- ly. For the reason that only one training sequence is needed and without estimating the channel and noises power, the communication efficiency has been improved. The simulation demonstrates that it has well performance in fre- quency-domain equalization under the quasi-static channels.