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    • 3. 发明申请
    • DETERMINISTIC RE-MULTIPLEXING FOR DVB SFN NETWORKS
    • DVB SFN网络的确定性重复合
    • WO2017215769A1
    • 2017-12-21
    • PCT/EP2016/064106
    • 2016-06-17
    • NEVION EUROPE AS
    • STEPHANSEN, HelgeJENSEN, Bjørn, TommyDALE, Anders
    • H04H20/18H04H20/67H04N21/236
    • A method for adding Metadata packets to an MPEG-2 transport stream transmitted via a broadcast network, comprising providing feeds of data from at least one source, where the feeds comprise payload packets being referenced by a common 1PPS reference, and where the feeds are input to at least one multiplexer, MUX; providing Time Marker Packets, TMPs, as input to each multiplexer, where each TMP comprises a plurality of time stamps per second measured relative to said 1PPS reference, and each TMP has a value representing an Absolute Program Clock Reference, APCR, at the time of transmission, where the APCR is based on the Epoch time, and where the TMP packet further comprises PCR, OPCR locked to said 1 PPS and UTC leap seconds; letting each MUX generate SFN Synchronisation Frame based on the set rate of the SFN transport stream, the length of each SFN frame and said TMP comprising the APCR; multiplexing and applying rate adaptation matching the system specific modulation scheme to a final multiplexed deterministic transport stream.
    • 用于将元数据分组添加到经由广播网络传送的MPEG-2传输流的方法包括提供来自至少一个源的数据馈送,其中馈送包括由公共1PPS引用的有效载荷分组 参考,并且馈送被输入到至少一个复用器MUX; 提供时间标记包TMP作为每个多路复用器的输入,其中每个TMP包括相对于所述1PPS基准测量的每秒多个时间戳,并且每个TMP具有表示绝对节目时钟基准APCR在 传输,其中APCR基于Epoch时间,并且其中TMP分组还包括PCR,OPCR锁定到所述1PPS和UTC闰秒; 使每个MUX根据SFN传输流的设置速率,每个SFN帧的长度和包括APCR的所述TMP产生SFN同步帧; 多路复用并将系统特定调制方案与最终复用确定性传输流相匹配的速率自适应。
    • 10. 发明申请
    • IMPROVEMENTS TO SYNCHRONIZATION METHODS FOR SINGLE-FREQUENCY SIMULCAST MOBILE RADIO COMMUNICATION NETWORKS
    • 改进单频同步无线电通信网络的同步方法
    • WO2008110992A1
    • 2008-09-18
    • PCT/IB2008/050889
    • 2008-03-12
    • SELEX COMMUNICATIONS S.P.A.RESIDORI, Francesco
    • RESIDORI, Francesco
    • H04L7/00H04B7/155H04H20/67
    • H04L7/0012H04B7/15528H04H20/67
    • What is described is a circuit arrangement and a method for synchronizing the communication signals between a repeater station (S) of a single-frequency simulcast radio communication network (N) and user terminals (T) with respect to a universal reference signal sent by a central station (M) of the network (N) communicating with the repeater station (S). A frequency offset is determined between a universal frequency reference signal received from the central station (M) and a local frequency reference signal of the repeater station (S), and in the repeater station (S) there are provided a first feedback control loop for supplying a signal for controlling a local oscillator of the repeater station (S) on the basis of the said determined frequency offset, and a second direct control loop for supplying a signal for compensating the residual synchronization difference of the local oscillator (16) to which the transmitter device of the station (S) is tuned.
    • 所描述的是一种电路装置和方法,用于在单频同步无线电通信网络(N)的中继站(S)和用户终端(T)之间相对于由一个通用参考信号发送的通用参考信号来同步通信信号 与中继站(S)通信的网络(N)的中心站(M)。 在从中心站(M)接收的通用频率参考信号和中继站(S)的本地频率参考信号之间确定频率偏移,并且在中继站(S)中,提供了第一反馈控制回路 基于所述确定的频率偏移来提供用于控制中继站(S)的本地振荡器的信号;以及第二直接控制环路,用于提供用于补偿本地振荡器(16)的剩余同步差的信号, 站(S)的发射机设备被调谐。