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Least mean square (LMS) decision feedback equalizer (DFE) is preferred as an effective solution to coping with inter-symbol interference (ISI) for ATSC digital television (DTV) receivers. In DTV transmission environment, echo delay often covers several hundreds symbols, which leads to very large-scale equalizer. One consequence of the large-scale equalizer is the very slow convergence, which combined with error propagation, inherent drawback of DFE, seriously deteriorates the performance of the receivers, especially in severe channels. More working modes and corresponding robust control mechanism were given to help the equalizer converge to the stable state smoothly. Simulation results show that the improved equalizer can perform better, especially in the severe channels. 相似文献
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通过公交站距优化可以缩短单程公交线路公交车的运行时间,提高公交服务水平.以公共汽车客运能力和最优平均站距为站距优化的定量指标,以客流需求量及站距选取两方面相结合作为站距优化时站点合并或取消的依据,得出以距离为分配原则的客流需求量分配模型方法.最后以长春市265公交车为例进行案例分析,得出该优化原理节省了乘客乘车的时间,... 相似文献
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薄圆桶压电振子是薄金属圆桶底部粘合压电陶瓷圆片的振动元件.文章利用瑞利—里兹法,采用弹性边界约束条件,对薄圆桶压电振子的振动特性进行理论分析,推导得到压电振子振动频率方程,通过数值计算分析支撑结构对压电振子频率的影响,为该类传感器的研制提供设计依据.经分析计算,当压电振子中陶瓷圆片结构确定时,振子的谐振频率随支撑结构厚度的增加、半径的减小而增大.其中当金属底面厚度与振子总厚度之比在0.5~0.75之间时,振子谐振频率变化缓慢,当两者厚度比超过0.75后,谐振频率迅速增高;而当压电圆片与支撑结构半径比在0.4~0.9之间变化时,振子谐振频率随两者半径比的增大而增加,变化斜率也略有增大. 相似文献
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