基于OFDM信号的自适应水声信道估计算法

发布时间：2018-02-11 15:18

本文关键词： 信道估计正交频分复用自适应水声通信　出处：《电子科技大学学报》2014年05期 　论文类型：期刊论文

【摘要】：建立适用于OFDM水声通信信号的信道估计模型,对MP算法进行改进,引入路径门限调整机制克服虚假路径造成的不良影响,通过重要路径权系数的迭代修正降低非正交性引入的估计误差,以较小计算量取得了与OMP算法相当的估计精度;针对传统信道估计算法对信道长度信息的依赖问题,提出了一种信道长度自适应信道估计算法,该算法能够对信道估计质量进行实时评价,并根据评价结果实现信道估计算法预估信道长度的自适应调整,满足未知水声信道精确估计及通信应用的需要;基于OFDM导频元素个数与信道估计效果的关系研究,提出了OFDM导频序列自调整的通信方案,以较小的带宽损失保证了可靠的水声通信。通过仿真和实地试验,验证了该文研究内容的有效性。
[Abstract]:The channel estimation model suitable for OFDM underwater acoustic communication signal is established, the MP algorithm is improved, and the path threshold adjustment mechanism is introduced to overcome the bad influence caused by false path. The estimation error introduced by non-orthogonality is reduced by iterative correction of important path weight coefficients, and the estimation accuracy is equal to that of OMP algorithm with small computational complexity, aiming at the dependence of traditional channel estimation algorithm on channel length information. A channel length adaptive channel estimation algorithm is proposed, which can evaluate the channel estimation quality in real time. According to the evaluation results, the channel length estimation algorithm can adjust the channel length adaptively. Based on the study of the relationship between the number of pilot elements of OFDM and the effect of channel estimation, a self-adjusting communication scheme of OFDM pilot sequence is proposed. The reliability of underwater acoustic communication is guaranteed by small bandwidth loss. The effectiveness of the research is verified by simulation and field experiments.
【作者单位】：海军工程大学电子工程学院;
【基金】：国家自然科学基金(61101205) 湖北省自然科学基金(2009CDB337)
【分类号】：TN929.3

【相似文献】