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针对目前MIMO-OFDM系统信道估计算法运算复杂度高的问题,本文着重研究低复杂度的基于导频的信道估计算法。首先,发送导频信息获得导频子载波处信道参数,然后利用插值算法来恢复出整个信道的信道参数信息,最后采用运算复杂度低的频域分段最小均方误差(SMMSE)算法,并与基于训练序列的LS和MMSE这两种基本的信道估计算法进行了比较。 相似文献
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Drawing upon theories governing micro-institutions and strategic actions on resources, this study proposes a model suitable for assessing the antecedents and consequences of “Internet-Based Channel Orientation” (IBCO) on the operations of domestic companies of moderate or lesser size. Investigation focused primarily on the entrepreneurial capability (ENCAP) of such firms and industrial competition (INDCOM) as predictors of the IBCO of a business. Analysis was conducted as to whether IBCO contributed to heightened market sensing capability (MKTSENSE) and indirectly reinforced competitiveness. To this end, data was sourced from 198 firms based in Nigeria, typically micro-, small- and medium-sized businesses. Statistical analysis indicated that IBCO had a stronger and direct effect on encouraging the fluency of operations at small- and medium-sized enterprises. However, IBCO in combination with a competitive advantage was insufficient to attain competitiveness, the magnitude of such an effect being indirectly anchored to the MKTSENSE of the firm. This study highlights that businesses need to invest in Internet marketing tools and employ them effectively to stay competitive over the long term. 相似文献
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随着无线智能终端的普及,无线局域网得到了快速的发展,环境中分布着各类无线信号,这些信号位于各个相同或是不同的频段上。由于无线局域网信道的特性,将造成相互间的干扰。采用OPNET软件建立网络模型,模拟两个不同信道设置的Ad_Hoc网络之间距离变化以及业务流量差异情况,测试信道的干扰对网络造成的影响情况进行仿真,并对仿真结果进行分析。 相似文献
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中缅印度洋新通道建设,对于构建以国内大循环为主体、国内国际双循环相互促进的新发展格局、适应全球产业链供应链重构和破解“马六甲困局”意义深远。中国科学院科技战略咨询研究院课题组基于智库双螺旋法的逻辑认知并站在战略、全局、时代和历史的高度,系统性研究、创造性提出“双Y字形”中缅印度洋新通道战略布局新构想:近期赋能现有交通设施发展海公铁跨境多式联运模式,中远期通过投资建设发展海铁联运模式,打造中国西南直达印度洋乃至大西洋的战略通道。目前,中缅印度洋新通道建设正朝着常态化、规模化、专业化、效益化方向积极推进。 相似文献