基于RIE和IS-DT-FCME的直扩系统窄带干扰抑制方法

NBI suppression based on RIE and IS-DT-FCME in DSSS

为了提高直扩系统中干扰抑制模块的使用效能,以降低无干扰或干扰较小时系统干扰抑制的开销、提高系统的干扰抑制能力,提出基于干扰存在性识别(RIE)和分段迭代双门限前向连续均值切除(IS-DT-FCME)算法的直扩系统窄带干扰(NBI)抑制方法。该方法利用RIE对直扩系统遭受干扰程度进行判断,确定干扰抑制器的开启;针对DT-FCME算法迭代时间长的缺点,借鉴基于均匀量化的分段迭代思想,提出IS-DT-FCME方法,提高通信效率。理论分析和实验结果表明:RIE算法对干扰类型和干扰带宽不敏感,具有很好的可靠性和有效性;存在干扰抑制时,在不改变干扰抑制性能的前提下,IS-DT-FCME的迭代次数仅为原算法的1/O(0.45N^(1/2),处理速度显著提高。

In order to enhance the efficiency of interference suppression model and cut down the cost of system when there ts no interference or low interference, Recognition of Interference Existence （RIE） and Iterative Segmentation Double Threshold Forward Consecutive Mean Excision （IS-DT-FCME） are proposed. RIE is used to ensure interference suppressor on or off .IS-DT-FCME is presented to conquer the long iteration time in DT-FCME based on the idea of uniform quantizing. The theoretical analysis and simulation results verify that RIE algorithm is not sensitive to interference types and bandwidth, so RIE has good reliability and validity. When IS-DT-FCME is used in DSSS, the speed of iteration is only 1/0（0.45,√N）times of original algorithm without changing the performance of interference suppression.