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影响我院高等数学教学质量的原因及对策 总被引:1,自引:0,他引:1
针对影响高等数学教学质量的原因,提出解决问题的对策。比如加强课程建设,提高数学教师素质,优化教学方法等,可以提高学生学习数学的积极性。 相似文献
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针对影响高等数学教学质量的原因,提出解决问题的对策,比如加强课程建设,提高数学教师素质,优化教学方法等,可以提高学生学习数学的积极性. 相似文献
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In this paper, Moose scheme is used for frequency offset estimation in OFDMA uplink svstems due to that the signals from different users can be easily distinguished in frequency domain. However, differential multiple access interference (MAI) will deteriorate the frequency offset estimation performances, especially in interleaved OFDMA system. Analysis and simulation results manifest that frequency offset estimation by Moose scheme in block OFDMA system is more robust than that in interleaved OFDMA systern. And an iterative interference cancellation method has been proposed to suppress the differential MAI interference for interleaved OFDMA system, in which Moose scheme is the special case of the number of iteration is equal to one. Simulation results demonstrate that the proposed method can improve the performance with the increase of the number of iterations. In consideration of the performance and complexity, the proposed method with two iterations is selected. And the full comparison results of the proposed iterative method with two iterations and that with one iteration (conventional Moose scheme) are given in the paper, which sufficiently demonstrate that the performance gain can be obtained by the interference cancellation operation in interleaved OFDMA system. 相似文献
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采用矩阵变换法降低OFDM信号峰均功率比值 总被引:1,自引:0,他引:1
如何降低正交频分复用(OFDM)系统中的峰均功率比(PAPR)是有效应用OFDM技术的一.因此提出了一种基于矩阵变换降低OFDM信号PAPR值的方法.恰当地选取或设计变换矩阵可以很好地改善OFDM信号的PAPR分布特性,因此选取了4种矩阵作为变换矩阵,并对其性能进行了仿真分析,仿真结果表明,矩阵变换法能有效地降低OFDM信号的PAPR值,并具有较低的计算复杂度和较好的实用价值. 相似文献
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设Fq是q个元素的有限域,其中q是素数的幂,Fnq是Fq上n维向量空间,用[nm]q表示Gaussian系数,它可看做Fnq的m维子空间的个数.运用组合方法证明了几个已知的Gaussian系数恒等式,并给出几个新的Gaussian系数恒等式和它的组合方法证明. 相似文献
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