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    • 1. 发明授权
    • Method and system for providing multicast and broadcast service using scalable video coding
    • 使用可伸缩视频编码提供组播和广播业务的方法和系统
    • US08611425B2
    • 2013-12-17
    • US13304520
    • 2011-11-25
    • Ju Heon KimChung Gu KangJin Woo KimJin Su JungYong In Choi
    • Ju Heon KimChung Gu KangJin Woo KimJin Su JungYong In Choi
    • H04N7/12
    • H04N21/234327H04N21/6131H04N21/631H04N21/6405
    • A method and system for efficiently transmitting data, to which scalable image coding has been applied over a single frequency network is provided. The system includes a control server which re-packetizes data packets, received from a multimedia server, into a scalable bit stream by separately encoding the data packets into a base layer and one or more enhancement layers, and at least one base station which adaptively multicasts and broadcasts the scalable bit stream, received from the control server, to a plurality of terminals located in the area of a cell. The at least one base station multicasts and broadcasts the base layer across the area of the cell, and adaptively transmits the one or more enhancement layers depending on channel status or terminal performance of the plurality of terminals.
    • 提供了一种用于有效地发送已经通过单个频率网络应用可伸缩图像编码的数据的方法和系统。 该系统包括控制服务器,其通过将数据分组分别编码为基本层和一个或多个增强层,将从多媒体服务器接收的数据分组重新分组成可缩放比特流,以及至少一个基站,其自适应地多播 并且将从控制服务器接收到的可缩放比特流广播到位于小区区域中的多个终端。 所述至少一个基站在所述小区的所述区域上多播和广播所述基本层,并且根据所述多个终端的信道状态或终端性能自适应地发送所述一个或多个增强层。
    • 8. 发明申请
    • METHOD OF BANDPASS SAMPLING USING SINGLE SIDEBAND CONVERTING
    • 使用单侧转换的BDPD采样方法
    • US20110110471A1
    • 2011-05-12
    • US12711012
    • 2010-02-23
    • Jinwoo ParkChung Gu Kang
    • Jinwoo ParkChung Gu Kang
    • H04B1/10
    • H04B1/0032H04B1/0025
    • The present invention provides a method of bandpass sampling which particularly includes the single-sideband signal conversion procedure prior to the sampling process in the purpose of lowering the required sampling frequency. Conversion of the bandpass RF signal into a single-sideband spectrum signal which has the spectrum components only in either the positive or the negative frequency domain is accomplished by bandpass-filtering, or more effectively by using a Hilbert transformer. This invention includes a method of finding the minimum sampling frequency for simultaneous frequency down-conversion of multiple RF bandpass signals. It is expected from this invention that the components additionally required in the RF receiver due to the proposed bandpass sampling method is the bandpass filters or the Hilbert transformer for single-sideband conversion, but the benefits from this invention could be the reduced ADC speed performance and the subsequent digital processing load in the receiver system because of the reduced data rates.
    • 本发明提供了一种带通采样方法,其特征在于包括采样过程之前的单边带信号转换过程,以降低所需的采样频率。 通过带通滤波,或更有效地通过使用希尔伯特变换器,将带通RF信号转换成仅具有正或负频域中的频谱分量的单边带频谱信号。 本发明包括找到多个RF带通信号的同时下变频的最小采样频率的方法。 从本发明预期,由于所提出的带通采样方法,RF接收机中另外需要的组件是用于单边带转换的带通滤波器或希尔伯特变换器,但是本发明的益处可以是降低的ADC速度性能和 随后的数字处理负载在接收机系统中由于数据速率的降低。