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k-LNM及其在单频网增益计算中的应用 被引量:3
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作者 徐铮宁 王世签 夏治平 《电视技术》 北大核心 2017年第9期56-58,64,共4页
从概括介绍地面数字电视单频网多重信号合成算法入手,着重介绍了国家标准推荐的k-LNM算法,并将kLNM算法应用到地面数字电视单频网增益的理论计算问题中。通过将单频网增益分为统计增益和加性增益,并定义单频网内多重信号等场强和不等场... 从概括介绍地面数字电视单频网多重信号合成算法入手,着重介绍了国家标准推荐的k-LNM算法,并将kLNM算法应用到地面数字电视单频网增益的理论计算问题中。通过将单频网增益分为统计增益和加性增益,并定义单频网内多重信号等场强和不等场强两种接收场景,计算出地面数字电视单频网不同地点概率条件下的增益值,从而为地面数字电视单频网的规划提供技术参考。 展开更多
关键词 k-LNM 单频网增益 信号合成 地面数字电视
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k-LNM计算单频网增益应用研究
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作者 郑科鹏 杨方正 夏治平 《电视技术》 2021年第4期45-52,共8页
概述地面数字电视单频网(Single Frequency Network,SFN)增益的概念、SFN覆盖判据及k因子对数正态法(k Log-Normal Method,k-LNM)算法,研究SFN组网前后对数正态分布变量的变化趋势,将SFN增益分为加性增益和统计增益,针对等场强和不等场... 概述地面数字电视单频网(Single Frequency Network,SFN)增益的概念、SFN覆盖判据及k因子对数正态法(k Log-Normal Method,k-LNM)算法,研究SFN组网前后对数正态分布变量的变化趋势,将SFN增益分为加性增益和统计增益,针对等场强和不等场强两种场景给出了应用k-LNM计算SFN增益的实例并分析计算结果。研究过程和结果为地面数字电视广播(Digital Television Terrestrial Multimedia Broadcasting,DTMB)SFN组网规划和建设过程中扩大覆盖和降低干扰提供了新的理论依据。 展开更多
关键词 k-LNM 单频网增益 加性增益 统计增益 信号合成 地面数字电视
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Space time frequency coding for dual polarization MIMO in hybrid mobile satellite system
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作者 WANG Kai-dong GUO Ling-zhi +1 位作者 TAO Xiao-feng CUI Qi-mei 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2013年第4期8-14,共7页
The hybrid mobile satellite system operating in a single frequency network (SFN) mode is increasingly becoming attractive. The combination of satellite component (SC) and terrestrial component (TC) promises a be... The hybrid mobile satellite system operating in a single frequency network (SFN) mode is increasingly becoming attractive. The combination of satellite component (SC) and terrestrial component (TC) promises a better quality of service (QoS). Multimedia broadcast and multicast services (MBMS) are expected to be prevailed in this kind of system. Several space frequency (SF) or space time (ST) codes have been proposed to enhance the system performance due to the lack of reverse link and omni-directional transmission. However, they mostly consider the system with only one SC and one TC and fail to make full use of available diversities. This paper presents a novel way to realize the dual polarization multiple input multiple output (MIMO) transmission by using the space time frequency (STF) code. The theoretical analysis and simulations indicate that the application of STF code can improve the system performance dramatically. A higher diversity gain can be achieved due to the cooperative transmission of SC and TC, while the coding gain can be enhanced by the reusing of STF code between SCs or TCs. Even if some of the links are lost, it can still work properly and benefit from the STF code. The relative relay can result in a degradation up to 0.5 dB in the coding gain. 展开更多
关键词 MIMO dual polarization hybrid mobile satellite system sfn STF code diversity gain
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