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    • 21. 发明申请
    • SYSTEM, SERVER AND METHOD FOR OPTIMIZING A GROUP MANAGEMENT PROTOCOL
    • 用于优化集团管理协议的系统,服务器和方法
    • US20090219933A1
    • 2009-09-03
    • US12277050
    • 2008-11-24
    • Feng GuoSingh Krishnaraj RathoreHaiyang SuXiaoniu Zhou
    • Feng GuoSingh Krishnaraj RathoreHaiyang SuXiaoniu Zhou
    • H04L12/56
    • H04L12/185H04L63/0236
    • The present invention discloses a method, server and system for optimizing a group management protocol so as to reduce the complexity in setting and switching filter modes in the prior protocols. The method includes: a group member sends a membership report to a multicast router; upon reception of the membership report, the multicast router judges whether the report carries an EXCLUDE mode non-empty source list; if so, the router updates a corresponding state inside the router according to a non-source-specific join; or else, the router updates the corresponding state inside the router directly with the information of the report. The method provided by the present invention can avoid the complex switching and processing of filter modes in the prior protocols.
    • 本发明公开了一种用于优化组管理协议的方法,服务器和系统,以降低在先前协议中设置和切换过滤模式的复杂度。 该方法包括:组成员向组播路由器发送成员关系报告; 组播路由器接收到成员关系报告后,判断该报告是否携带EXCLUDE模式非空源列表; 如果是,则路由器根据非源特定连接更新路由器内的对应状态; 否则,路由器会直接使用报告的信息更新路由器内的相应状态。 本发明提供的方法可以避免现有协议中的过滤模式的复杂切换和处理。
    • 23. 发明申请
    • Method and apparatus for frame synchronization in a distributed MIMO OFDM system
    • 在分布式MIMO OFDM系统中帧同步的方法和装置
    • US20070058521A1
    • 2007-03-15
    • US11519149
    • 2006-09-12
    • Feng GuoHongwei YangDong Li
    • Feng GuoHongwei YangDong Li
    • H04J11/00
    • H04L27/2656H04L5/0023H04L5/0048H04L27/2613H04L27/2675
    • The present invention relates to technique for frame synchronization in a distributed MIMO-OFDM system, and the method thereof comprises: generating step: generating preambles for synchronization at respective transmitting antennas using PN sequences with different lengths which have one-to-one correspondence to the respective transmitting antennas by a transmitter; locating step: performing calculation using correlation calculators with width of window corresponding to the lengths of the PN sequences to locate head of frame by a receiver. The present invention proposes a solution for frame synchronization using sequences with non-equal periods in a distributed MIMO-OFDM system, and head of the frames transmitting from respective transmitting antennas can be accurately found using correlation calculation at a receiver by means of the technique. Since the PN sequences with different lengths are used at respective transmitting antennas to form corresponding preambles, when a correlation calculator corresponding to a certain transmitting antenna is used, all data or preambles at other antennas can not produce interference, i.e. delay between distributed transmitting antennas can not has an effect on detection of head of frame at a certain transmitting antenna.
    • 本发明涉及分布式MIMO-OFDM系统中的帧同步技术,其方法包括:生成步骤:使用具有一个一对应对应的不同长度的PN序列,在各个发射天线上产生用于同步的前同步码 各发射天线; 定位步骤:使用具有对应于PN序列的长度的窗口宽度的相关计算器来执行计算,以由接收器定位帧的头部。 本发明提出了一种在分布式MIMO-OFDM系统中使用具有不等周期的序列的帧同步的解决方案,并且可以通过该技术在接收机处使用相关计算来精确地找到从各个发送天线发送的帧的头部。 由于在各个发射天线使用不同长度的PN序列来形成相应的前导码,所以当使用与特定发射天线相对应的相关计算器时,其他天线的所有数据或前同步码不能产生干扰,即分布式发射天线之间的延迟 对某个发射天线的帧头检测没有影响。