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    • 31. 发明授权
    • Apparatus and method for measuring bit error rate in an OFDM communication system
    • 用于测量OFDM通信系统中误比特率的装置和方法
    • US06810020B2
    • 2004-10-26
    • US09772207
    • 2001-01-29
    • Eun-Ee ChoHo KimJong-Hyeon Park
    • Eun-Ee ChoHo KimJong-Hyeon Park
    • H04J1100
    • H04L5/0048H04L1/20H04L5/0007H04L27/2656
    • Disclosed is an apparatus for measuring a bit error rate (BER) in an orthogonal frequency division multiplexing (OFDM) communication system. A transmitter includes a pilot pattern inserter for inserting a first reference pilot pattern in subchannels of input data, and an OFDM modulator for OFDM-modulating the reference pilot pattern-inserted transmission data. A receiver includes a pilot pattern detector for OFDM-demodulating a data symbol received in a frame unit and detecting only a pilot pattern, and a BER operator for comparing the demodulated pilot pattern with a second reference pilot pattern, detecting and accumulating the number of pilot errors, and measuring a bit error rate by dividing the accumulated number of the pilot errors by the number of total received pilot patterns.
    • 公开了一种用于测量正交频分复用(OFDM)通信系统中的误码率(BER)的装置。 发射机包括用于在输入数据的子信道中插入第一参考导频模式的导频模式插入器和用于OFDM调制参考导频模式插入传输数据的OFDM调制器。 接收机包括用于OFDM解调以帧单元接收的数据符号并仅检测导频模式的导频模式检测器,以及用于将解调的导频模式与第二参考导频模式进行比较的BER算子,检测和累加导频数 通过将导频误差的累计数除以总接收导频模式的数量来测量误码率。
    • 37. 发明授权
    • Device and method for symbol frame synchronization of OFDM transmitter and receiver
    • OFDM发射机和接收机的符号帧同步的装置和方法
    • US07319660B2
    • 2008-01-15
    • US10412262
    • 2003-04-14
    • Ki-yun KimHo KimJun-yun LeeHyung-jin Choi
    • Ki-yun KimHo KimJun-yun LeeHyung-jin Choi
    • H04J11/00
    • H04L27/2613H04L27/2656
    • Provided is a frame synchronization pattern design and synchronization method by which in a transmitter of a communications system employing an orthogonal frequency division multiplexing (OFDM), a frame synchronization pattern is inserted into the starting part of a symbol frame, and by detecting the frame synchronization pattern in a receiver, synchronization of the OFDM transmitter and receiver is performed. Also, provided are a transmitter synchronization apparatus including an OFDM symbol frame generation unit, a frame synchronization pattern insertion unit, and an OFDM transmission signal conversion unit, and a receiver synchronization apparatus comprising a frame synchronization pattern inserted OFDM symbol frame conversion unit, a frame synchronization pattern detection unit, and a source data generation unit.Overcoming the conventional notion depending on the earlier art OFDM symbol standards, the OFDM symbol frame start detection method according to the present invention places a free-length code pattern, which is separately generated in a time domain, in the starting point of a frame and detects this pattern such that accuracy and efficiency greatly improve. Also, since the power value of a received signal is detected in the method, the communications system operates regardless of the frequency offset and phase offset. In addition, since a free-length pattern can be designed, the start point of a frame can be accurately detected in a seriously fading channel, by detecting a maximum peak based on correlation.
    • 提供了一种帧同步模式设计和同步方法,在采用正交频分复用(OFDM)的通信系统的发射机中,将帧同步模式插入符号帧的起始部分,并通过检测帧同步 接收机中的模式,执行OFDM发射机和接收机的同步。 此外,提供了包括OFDM符号帧生成单元,帧同步码型插入单元和OFDM传输信号转换单元的发射机同步装置,以及包括帧同步码型插入OFDM符号帧转换单元的接收机同步装置, 同步模式检测单元和源数据生成单元。 根据本发明的OFDM符号帧起始检测方法克服了以前的OFDM符号标准的常规概念,将在时域中单独生成的自由长度码模式放在帧的起点处, 检测这种模式,使得精度和效率大大提高。 此外,由于在该方法中检测到接收信号的功率值,所以通信系统不管频率偏移和相位偏移如何运行。 此外,由于可以设计自由长度图案,因此通过基于相关性检测最大峰值,可以在严重衰落的信道中准确地检测帧的起始点。
    • 40. 发明申请
    • Tag authentication apparatus and method for radio frequency identification system
    • 用于射频识别系统的标签认证装置和方法
    • US20070133807A1
    • 2007-06-14
    • US11607496
    • 2006-11-30
    • Hang LeeDo HongHo Kim
    • Hang LeeDo HongHo Kim
    • H04L9/00
    • H04L9/0891H04L9/3236H04L2209/38H04L2209/805
    • A radio frequency identification (RFID) tag authentication apparatus and method for accomplishing quick authentication and solving privacy problems using a hash algorithm are provided. An RFID tag includes a memory unit storing a tag's secret information and a group's secret information and a hash chain computation unit encrypting secret information based on a hash algorithm. The tag authentication apparatus includes a DB storing information about RFID tags, which is classified into groups and includes each group's secret information and each tag's secret information; a group's secret information search unit finding a group to which a tag to be authenticated belongs; and a tag's secret information search unit searching tags' secret information included in the found group.
    • 提供了使用散列算法实现快速认证和解决隐私问题的射频识别(RFID)标签认证装置和方法。 RFID标签包括存储标签的秘密信息和组的秘密信息的存储单元以及基于散列算法加密秘密信息的散列链计算单元。 标签认证装置包括存储关于RFID标签的信息的数据库,其被分类为组,并且包括每个组的秘密信息和每个标签的秘密信息; 查找要认证的标签属于的组的组的秘密信息搜索单元; 以及标签的秘密信息搜索单元,搜索包括在所找到的组中的标签的秘密信息。