摘要
滤波多音系统中,多径衰落信道会给导频引入严重的符号间和载波间的干扰,导致信道估计算法性能降低,针对该问题,提出了一种基于迭代干扰消除的时域信道估计算法。算法由信道估计、发送符号估计和干扰求解3个模块构成,通过三者的级联反馈,迭代消除数据对导频的干扰,提高算法的估计准确度。此外,文章从实用角度对算法进行了简化。仿真结果表明,该算法能够在增加极少运算量的情况下明显地提高信道估计性能,且经过二次迭代,其性能更能趋近克拉美罗限。
In filtered multitone（ FMT） systems,the inter symbol interference（ ISI） and inter carrier interference（ ICI） on pilots introduced by the multipath fading channels would lead to severe degradation of channel impulse response（ CIR） estimation. To solve this problem,an algorithm based on iterative interference cancellation is proposed which is composed of three modules： a CIR estimator,a transmitted symbols estimator and an interference calculato. The interference on pilots caused by adjacent symbols could be removed effectively through exchanging information of the three modules,thus improving the accuracy of CIR estimation. What＇s more,a simplified algorithm is also derived. Simulation results illustrate that the algorithm can further improve performance with little computational complexity increase. Moreover,it can achieve the cramer-rao bounds（ CRB） approximately after two iterations.
出处
《信息工程大学学报》
2015年第6期718-724,共7页
Journal of Information Engineering University
基金
国家自然科学基金资助项目(61072046)
河南省基础与前沿计划资助项目(132300410049)
关键词
滤波多音
时域信道估计
迭代干扰消除
filtered multitone（FMT）
time domain channel estimation
iterative interference cancellation
