公开(公告)号：US06580765B1

公开(公告)日：2003-06-17

申请号：US09337149

申请日：1999-06-21

Applicant: Key Hyun Kim ,  Yong Chul Song ,  Beomsup Kim

Inventor： Key Hyun Kim ,  Yong Chul Song ,  Beomsup Kim

IPC: H03D324

CPC classification number: H04L7/0278

Abstract: An apparatus for recovering symbol timing in a CAP-based high-speed communication system such as an ADSL or VDSL, using a single-sided prefilter pair, in which timing information is obtained by means of the single-sided prefilter pair and a multiplier instead of a squaring unit used in general communication systems, for the recovery of accurate data, so that the symbol timing can be recovered through a digital signal process at a clock rate which is four times as high as a symbol transmission rate. According to the present invention, the single-sided prefilter pair and multiplier are used instead of the squaring unit spreading a frequency band. Therefore, the frequency band is not spread, so that the timing can be obtained with no signal overlapping due to sampling, although a sampling frequency is four times as high as a symbol frequency. Further, band components unnecessary to the timing information extraction are removed from a transmitted signal by filtering it respectively at higher and lower frequency bands, and the timing information is obtained by multiplying the two filtered signals by each other. These have the effect of reducing a timing jitter which may occur on a specific pattern of data due to the filtering.

Abstract translation: 一种用于在基于CAP的高速通信系统（例如ADSL或VDSL）中使用单面预滤波器对来恢复符号定时的装置，其中通过单面预滤波器对和乘法器来获得定时信息 在通用通信系统中使用的平方单元，用于恢复精确数据，使得可以通过数字信号处理以符号传输速率的四倍的时钟速率来恢复符号定时。 根据本发明，使用单面预过滤器对和乘法器代替扩展频带的平方单元。 因此，频带不扩展，因此虽然采样频率是符号频率的四倍，但是由于采样，可以在没有信号重叠的情况下获得定时。 此外，通过在较高和较低频带分别对发送信号进行滤波，从定时信息提取中不必要的频带分量被去除，并且通过将两个滤波信号彼此相乘来获得定时信息。 这些具有减少由于滤波而在特定的数据模式上可能发生的定时抖动的效果。

公开(公告)号：US20080252426A1

公开(公告)日：2008-10-16

申请号：US11815476

申请日：2006-01-06

Applicant: Hong Bae Lee ,  Key Hyun Kim ,  Jae Cheol Shin ,  Jung Suk Lee ,  Jun Seok Park ,  Ha Ryoung Oh ,  Moon Que Lee ,  Byung Jun Jang

Inventor： Hong Bae Lee ,  Key Hyun Kim ,  Jae Cheol Shin ,  Jung Suk Lee ,  Jun Seok Park ,  Ha Ryoung Oh ,  Moon Que Lee ,  Byung Jun Jang

IPC: H04B7/24

CPC classification number: G06K7/0008 ,  G06K19/0701

Abstract: The present invention relates, in general, to a Radio Frequency Identification (RFID) system for reading or recording RFID tag information using radio frequencies and, more particularly, to an intelligent RFID system for low-powered reader-tag communication, which includes an RF shower system (370) that radiates a high power electromagnetic wave in a high frequency band to activate the passive tags having no batteries and that has predetermined communication means for reading information from a plurality of passive tags existing in a radiation zone having a predetermined size, storing the read tag information, and providing the stored tag information when a request is received from an RFID reader (310).

Abstract translation: 本发明一般涉及使用无线电频率读取或记录RFID标签信息的射频识别（RFID）系统，更具体地，涉及用于低功率读取器 - 标签通信的智能RFID系统，其包括RF 淋浴系统（370），其以高频带辐射高功率电磁波，以激活不具有电池的无源标签，并且具有用于从存在于具有预定尺寸的辐射区域中的多个无源标签读取信息的预定通信装置， 存储读取的标签信息，以及当从RFID读取器（310）接收到请求时，提供所存储的标签信息。