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针对IEEE802.16d帧结构提出一种结合前导训练序列和导频的信道估计算法。算法通过前导完成初始精确的信道估计,再使用判决反馈方式提高导频估计准确度,并根据前后符号导频估计结果得到反映信道变化的时变因子,利用它来调整前导估计和导频估计比例,联合完成信道估计。仿真结果表明,与传统的信道估计方法相比,此算法能够更有效的对抗频率选择性衰落和更大的多普勒频移,改善系统的性能。
Aiming at the IEEE 802.16d frame structure, a channel estimation algorithm combined with pilot training sequence and pilot is proposed. The algorithm completes the initial accurate channel estimation through the preamble and then uses the decision feedback method to improve the accuracy of the pilot estimation. The time-varying factor reflecting the channel variation is obtained according to the pilot symbol estimation, which is used to adjust the ratio of the preamble estimation and the pilot estimation , Joint completion of channel estimation. The simulation results show that compared with the traditional channel estimation method, this algorithm can more effectively combat frequency selective fading and larger Doppler shift, and improve the system performance.