SFN

This paper describe the principle and structure of SFN Adapter 's design in detail .

本文详细介绍了单频网适配器的设计原理和结构。

Firstly , we analyzed the structure of SFN and the principle of the synchronization .

首先，本文分析了单频网的组网方式和同步原理。

Research on Clock Feeds and Recovery Methods in Railway TV SFN System

铁路电视SFN系统时钟馈送和恢复方法技术研究

A Method of ICI Elimination in Wide Area SFN Systems with Long Delay

适用于大区域单频网的干扰消除方法

Design and implementation of SFN synchronization system in DVB-T modulator

DVB-T调制器单频网同步系统的设计与实现

Secondly , the integral scheme of SFN adapter 's implementation is proposed .

其次，本文提出了单频网适配器实现的整体方案。

At present , SFN is the best method of DTTB coverage .

单频网（SFN）是目前地面数字电视广播系统覆盖最好的方法之一。

The SFN adapter studied here is one of the key equipments of the SFN .

本文所研究的单频网适配器，是实现单频网组网的关键设备之一。

Study of Multiplexing , IP Transport and SFN Synchronization in DVB Head-end

对于DVB前端复用、IP传输及SFN同步的

Analysis of DVB-T SFN Synchronization Principle

DVB-T单频网同步原理分析

In this paper , a new system clock feeds and recovery scheme is proposed to overcome the deficiencies in existing SFN technology .

提出了一种新的适用于铁路电视单频网的系统时钟馈送和恢复方法。

PCR Correction in DVB-T SFN System

DVB-T单频网系统的PCR校正

Their research focuses on the anti-cancer activity of one of these compounds , called sulforaphane , or SFN .

他们的研究集中在这其中的一种化合物，被称为莱菔硫烷或SFN的抗癌作用上。

Compared with traditional multi-frequency network , SFN has the advantages of saving spectrum resources , facilitating spectrum planning and so on .

相比传统的多频网，单频网具有节省频谱资源，方便频谱规划等优点。

The International Affairs Committee ( SfN and US NAS ) supports neuroscientists worldwide through professional training and international collaboration .

国际事务委员会：藉由专业训练与跨国合作支持全球神经科学家。

The single frequency network ( SFN ) is the key technology in very high frequency ( VHF ) channel transmission of automatic hydrological forecast systems .

单频组网是水情自动测报系统中采用特高频信道传输的关键技术。

But , the properties of multi cell MBMS limited in the topological structure of SFN , the mobility of users and the business distribution .

但是，多小区MBMS的性能受限于单频网的拓扑结构、用户移动性和业务分布等因素，因此如何有效地进行单频网组网是一个亟待解决的问题。

The contraction of SFN scheme is that system judges periodically that if the throughput of the border cell is smaller than the threshold value .

收缩单频网方案是，周期性判断边界小区的吞吐量是否小于预先设定的吞吐量门限值，若是则收缩单频网。

To investigate the diagnosis and surgical management of schwannoma of facial nerve ( SFN ) and discuss the methods of repairing of facial nerve after operation .

目的：探讨诊断面神经鞘瘤的方法、手术治疗该病的效果及修复面神经功能的途径。

In this paper , how to realize multiplexing , linking Internet into DVB network and synchronizing SFN using a package processor in DVB head-end is studied .

本论文研究在DVB前端通过一个多功能的包处理器来实现复用、Internet接入DVB网络以及单频网同步的功能。

Mitochondrial apoptotic pathway mediated byAkt / p70S6K1 / Bad pathway and ERK signaling play an important role in apoptosis by incubating with SFN .

ERK途径和Akt/p70S6K1/Bad通路参与介导的线粒体凋亡途径在SFN诱导成熟脂肪细胞凋亡中起重要作用。

Objective To investigate whether sulforaphane ( SFN ), a hydrolysis product of glucosinolate from cruciferous vegetables , can protect myocardium of Se-deficient mice against viral infection .

目的探讨十字花科蔬菜成分Sulforaphane（SFN）对低硒病毒性心肌损伤是否具有保护作用。

According to the bandwidth and the total reception rate , we define the problem of SFN multicast / broadcast services selection as a KNAPSACK problem and present a greedy algorithm to solve it .

然后，依据带宽和接收率进行建模，将单频网多播广播业务的选择看作一个背包问题，用贪婪算法给予解决。

Single frequency network ( SFN ), as a transmission carrier for the digital signals of wireless radio and television , can greatly improve the spectrum utilization ratio under the environment where the frequency resources are scarce .

单频网作为无线广播电视数字信号的传输载体，在当今频率资源稀缺的大环境下，可以大大提高频谱利用率。

Based on DVB-T system , this paper discusses the importance of PCR correction in DVB-T SFN system . Furthermore , the concept of uneven-delay and an improved PCR correction method based on the same-time-base are presented .

研究了DVB-T单频网系统下节目参考时钟校正（PCR）的重要性，介绍了非均匀延迟的概念，最后提出一种改进的基于相同时基的PCR校正方法。

After summarize the trial data , we found that two-directional antenna diversity reception technology could simplify the channel model which the railway television faces ; the open-loop self-healing mechanisms could ensure reliable synchronization of the SFN system .

整理总结测试数据，发现双定向天线分集接收技术简化了铁路电视所面临的信道模型，开环自愈的同步机制保证了单频网系统的可靠同步。

This paper introduces single frequency network broadcasting technique for terrestrial digital HDTV and compares SFN scheme with main transmitter scheme . A new channel response estimation technique for OFDM system is proposed . It can improve spectrum efficiency of OFDM system .

介绍地面数字HDTV的单频网广播技术，并与单载波主发射机方案进行比较，提出OFDM系统中的一种信道估值新方案，它能显著地改善OFDM系统的频谱利用率。

The SFN ( Single Frequency Network ) is an important networking of DTMB . From the viewpoint of the exploitation of frequency resources and signal coverage , it has more obvious advantages than MFN ( Multiple Frequency Network ) .

单频网（SingleFrequencyNetwork，SFN）是地面数字电视广播的重要组网方式，在频率资源利用和信号覆盖等方面与多频网比较具有明显优势。

SFN ( Single Frequency Network , SFN ) Network : SFN transmitter simultaneously with the launch of a band on the same wireless signal that the transmitter frequency radio signal synchronization requirements , time synchronization and symbol simultaneously .

单频网（SingleFrequencyNetwork，SFN）组网规定：单频网发射台要同时在同一个频段上发射相同的无线信号，即各个发射机广播的信号要求频率同步，时间同步和码元同步。

Then we combine the kernel modules and the other modules to build the all the independent equipments of railway TV SFN system . These equipments include satellite adapter , terrestrial synchronous modulation transmitter and vehicle-mounted diversity receiver .

然后，将这些核心模块和其余功能模块组建起铁路电视各部分独立设备，设计出铁路电视单频网卫星适配器、地面同步调制发射机和车载分集接收机。