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    • 21. 发明授权
    • Apparatus and method for frequency synchronization in OFDM system
    • OFDM系统中频率同步的装置和方法
    • US07596181B2
    • 2009-09-29
    • US11227325
    • 2005-09-16
    • Jin-Weon ChangHwan-Joon KwonDong-Hee KimYoun-Sun KimJin-Kyu Han
    • Jin-Weon ChangHwan-Joon KwonDong-Hee KimYoun-Sun KimJin-Kyu Han
    • H04K1/10
    • H04L27/2659H04L27/2607H04L27/2633H04L27/266H04L27/2678
    • A method and apparatus are provided for frequency synchronization in an Orthogonal Frequency Division Multiplexing (OFDM) system, wherein the method includes the steps of transmitting OFDM symbols in such a manner that a data symbol size of a particular OFDM symbol in each frame is set to be smaller than a data symbol size of a typical OFDM symbol within the frame, receiving the OFDM symbols and calculating respectively, correlation coefficients of the particular OFDM symbol based on both a time interval of corresponding data symbols and a time interval of data symbols of the typical OFDM symbol, taking respectively phases of corresponding correlation coefficient calculated from the particular OFDM symbol and estimating a decimal part of a frequency offset, and determining an integer part of the frequency offset corresponding to the decimal part of the frequency offset, thereby estimating an entire frequency offset and acquiring the frequency synchronization.
    • 提供了一种在正交频分复用(OFDM)系统中进行频率同步的方法和装置,其中该方法包括以下步骤:以每个帧中的特定OFDM符号的数据符号大小被设置为 小于帧内的典型OFDM符号的数据符号大小,接收OFDM符号并分别基于相应数据符号的时间间隔和相应数据符号的数据符号的时间间隔分别计算特定OFDM符号的相关系数 分别采用从特定OFDM符号计算出的相应相关系数的相位,并估计频率偏移的小数部分,并且确定与频率偏移的小数部分相对应的频率偏移的整数部分,从而估计整个 频率偏移和获取频率同步。
    • 28. 发明授权
    • Apparatus and method for controlling packet data to provide multimedia broadcast/multicast services in a CDMA mobile communication system
    • 用于控制分组数据以在CDMA移动通信系统中提供多媒体广播/组播服务的装置和方法
    • US07693112B2
    • 2010-04-06
    • US10387029
    • 2003-03-12
    • Jin-Weon ChangKook-Heui LeeSung-Hoon KimJoon-Goo Park
    • Jin-Weon ChangKook-Heui LeeSung-Hoon KimJoon-Goo Park
    • H04B7/216
    • H04W76/40H04W56/00H04W72/005H04W88/18
    • An apparatus and method for providing multimedia broadcast and multicast services in a CDMA (Code Division Multiple Access) mobile communication system. The apparatus and method enable a common MBMC (Multimedia Broadcast/Multicast Control) layer to be allocated between a plurality of cells, enable MBMC layers to be classified on the basis of types of services, and use the classified MBMC layers. That is, individual MBMC layers do not have to store large-capacity data because a unique service or transmission rate in each of cells is based on a slow rate, and the individual MBMC layers corresponding to respective cells process a service requiring complex scheduling. Moreover, the apparatus and method enable the same information to be provided to a plurality of cells and enable a streaming-type service to be processed in a common MBMC layer commonly used in the cells. The apparatus and method can not only reduce an overhead of storage and processing devices but also minimize a time difference between broadcast and multicast timings of different cells, by enabling the common MBMC layer to commonly process MBMS information for the plurality of cells.
    • 一种用于在CDMA(码分多址)移动通信系统中提供多媒体广播和组播服务的装置和方法。 该装置和方法使得能够在多个小区之间分配公共MBMC(多媒体广播/多播控制)层,使得可以基于服务类型对MBMC层进行分类,并使用分类的MBMC层。 也就是说,单个MBMC层不必存储大容量数据,因为每个小区中的唯一服务或传输速率基于慢速率,并且对应于相应小区的各个MBMC层处理需要复杂调度的服务。 此外,该装置和方法使得能够向多个小区提供相同的信息,并且能够在小区中通常使用的公共MBMC层中处理流式服务。 该装置和方法不仅可以减少存储和处理设备的开销,而且通过使公共MBMC层能够共同处理多个小区的MBMS信息,从而最小化不同小区广播和组播定时之间的时差。