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    • 1. 发明授权
    • Apparatus and method for detecting packet end point in wireless communication system
    • 无线通信系统中的分组终点检测装置及方法
    • US08817921B2
    • 2014-08-26
    • US12965333
    • 2010-12-10
    • Il-Gu LeeEun-Young ChoiJung-Bo SonHun-Sik KangSok-Kyu Lee
    • Il-Gu LeeEun-Young ChoiJung-Bo SonHun-Sik KangSok-Kyu Lee
    • H04L27/14H04L27/26
    • H04L27/2656H04L5/0023H04L27/2657H04L27/2675H04L27/2678H04L27/2688
    • An apparatus for detecting a packet end point in a wireless communication system includes: a signal reception unit configured to receive a signal from an outside, convert the signal into a baseband signal, perform analog-digital conversion of the baseband signal, and perform a digital front end; a storage unit configured to store an output of the signal reception unit; a frequency offset estimation unit configured to estimate a frequency offset using the output of the storage unit; a frequency offset correction unit configured to compensate for a frequency error using the estimated frequency offset; an offset correlation unit configured to calculate correlation of the frequency offset and a cyclic prefix; an auto-correlation operation unit configured to calculate auto-correlation of the cyclic prefix; and a packet end detection unit configured to check a packet end point using the auto-correlation.
    • 一种用于在无线通信系统中检测分组终点的装置包括:信号接收单元,被配置为从外部接收信号,将该信号转换为基带信号,执行基带信号的模数转换,并执行数字 前端; 存储单元,被配置为存储所述信号接收单元的输出; 频率偏移估计单元,被配置为使用所述存储单元的输出来估计频率偏移; 频率偏移校正单元,被配置为使用所估计的频率偏移来补偿频率误差; 偏移相关单元,被配置为计算所述频率偏移和循环前缀的相关性; 自相关操作单元,被配置为计算所述循环前缀的自相关; 以及分组结束检测单元,被配置为使用所述自相关来检查分组结束点。
    • 6. 发明申请
    • APPARATUS AND METHOD FOR DETECTING SIGNAL IN WIRELESS COMMUNICATION SYSTEM
    • 用于在无线通信系统中检测信号的装置和方法
    • US20110150148A1
    • 2011-06-23
    • US12965282
    • 2010-12-10
    • Jung-Bo SONEun-Young CHOISok-Kyu LEE
    • Jung-Bo SONEun-Young CHOISok-Kyu LEE
    • H04L27/06
    • H04L27/3863H04L5/0023H04L5/005H04L27/2647
    • The apparatus includes a radio frequency (RF) unit configured to arrange a plurality of symbols received through an antenna at a frequency domain, an analog to digital (AD) converter configured to converts the plurality of symbols arranged at the frequency domain to digital symbols, a fast Fourier transform (FFT) unit configured to transform the digital symbols through a fast Fourier transform scheme, a compensator configured to compensate a gain mismatch between an I-channel and a Q-channel of the transformed digital symbols, a mapping unit configured to the compensated digital symbols to a constellation diagram, and a detector configured to correlate the mapped symbols, extract correlation results, and detect a high throughput (HT) signal using the extracted correlation results.
    • 该装置包括:射频(RF)单元,被配置为布置以频域通过天线接收的多个符号;模拟数字(AD)转换器,被配置为将在频域处布置的多个符号转换为数字符号; 被配置为通过快速傅里叶变换方案对数字符号进行变换的快速傅立叶变换(FFT)单元,配置为补偿经变换的数字符号的I信道和Q信道之间的增益失配的补偿器,配置为 将经补偿的数字符号转换成星座图,以及检测器,被配置为使所映射的符号相关,提取相关结果,并使用提取的相关结果检测高吞吐量(HT)信号。
    • 8. 发明授权
    • Residual frequency, phase, timing offset and signal amplitude variation tracking apparatus and methods for OFDM systems
    • 用于OFDM系统的残余频率,相位,定时偏移和信号幅度变化跟踪装置和方法
    • US07916797B2
    • 2011-03-29
    • US11286996
    • 2005-11-22
    • Heejung YuTaehyun JeonMyung-Soon KimEun-Young ChoiSok-Kyu LeeDeuk-Su Lyu
    • Heejung YuTaehyun JeonMyung-Soon KimEun-Young ChoiSok-Kyu LeeDeuk-Su Lyu
    • H04K1/10H04L27/00H04J11/00
    • H04L27/266H04L27/2659H04L27/2662H04L27/2675H04L27/2682H04L27/2685H04L27/2695
    • An error tracking apparatus and method for tracking a residual frequency error, a phase error, a timing error, and a signal amplitude variation to enhance a phase error tracking performance and a tracking speed in an orthogonal frequency division multiplexing (OFDM) system is provided. The error tracking apparatus and method include: a frequency error corrector for correcting a frequency at a time domain by adding a tracking carrier error estimating value to an initial carrier frequency error estimating value; a signal amplitude tracking corrector for controlling a signal amplitude by multiplying an input signal converted by a fast Fourier transform (FFT) by an output value corresponding to a calculated power of a receive pilot signal; a channel corrector for outputting a channel correcting signal by multiplying the receive pilot signal by a complex conjugate of a frequency channel response of the receive pilot signal; a carrier frequency error estimator for estimating a carrier frequency error parameter using the channel-corrected pilot and providing the tracking carrier frequency error estimating value; a time offset estimator for estimating a time offset parameter using the channel-corrected pilot; and a carrier phase error estimator for estimating a carrier phase error parameter using the channel-corrected pilot.
    • 提供了一种用于跟踪残余频率误差,相位误差,定时误差和信号幅度变化的误差跟踪装置和方法,以增强正交频分复用(OFDM)系统中的相位误差跟踪性能和跟踪速度。 误差跟踪装置和方法包括:频率误差校正器,用于通过将初始载波频率误差估计值加上跟踪载波误差估计值来校正时域的频率; 信号幅度跟踪校正器,用于通过将通过快速傅里叶变换(FFT)转换的输入信号乘以与所计算的接收导频信号的功率相对应的输出值来控制信号幅度; 信道校正器,用于通过将接收导频信号乘以接收导频信号的频率信道响应的复共轭来输出信道校正信号; 载波频率误差估计器,用于使用所述信道校正的导频来估计载波频率误差参数,并提供所述跟踪载波频率误差估计值; 时间偏移估计器,用于使用所述通道校正的导频来估计时间偏移参数; 以及载波相位误差估计器,用于使用信道校正的导频来估计载波相位误差参数。
    • 10. 发明申请
    • METHOD AND SYSTEM FOR PROVIDING INFORMATION ON PRE-PURCHASE AND POST-PURCHASE ITEMS USING RFID AND COMPUTER-READABLE STORAGE MEDIA STORING PROGRAMS FOR EXECUTING THE METHOD
    • 使用RFID和计算机可读存储媒体提供预购信息和购买后物品的方法和系统,用于执行方法
    • US20080208753A1
    • 2008-08-28
    • US12027932
    • 2008-02-07
    • Dong Hoon LeeEun Young ChoiIl Jung Kim
    • Dong Hoon LeeEun Young ChoiIl Jung Kim
    • H04K1/00
    • G06Q20/32G06Q20/045G06Q20/3278G06Q20/3823G06Q30/02G07G1/009H04L9/3263H04L9/3271H04L2209/56H04L2209/805
    • Pre-purchase and post-purchase item information provision methods and systems using an RFID technology and computer readable storage media storing programs for executing the methods are provided. A pre-purchase item information provision method for a radio frequency identification system according to the present invention includes transmitting, if a mobile reader is detected by a local server installed in a salesroom, a certificate containing information on a location of an object information service server and an authentication value to the mobile reader; transmitting, at the mobile reader, a query requesting an item ID to a tag attached to a target item; transmitting, at the tag, a item ID information generated by encrypting the item ID using the authentication value to the mobile reader; transmitting, at the mobile reader, the item ID information and the authentication value to the object information service server; and transmitting, at the object information service server, data retrieved in a database in correspondence to the item ID, the data being retrieved when the authentication value exists in the database. The item information provision method and system of the present invention can guarantee reliability of information on an item in the pre-purchase state and prevent the information from being eavesdropped in both the pre-purchase and post-purchase states. Also, the item information provision method and system can prevent the tag ID from being tracked, thereby protecting purchaser's privacy, preventing the tag from being forged, and improving computation efficiency.
    • 提供使用RFID技术的预购和购买后项目信息提供方法和系统以及存储用于执行方法的程序的计算机可读存储介质。 根据本发明的用于射频识别系统的预购项目信息提供方法包括如果由安装在销售室中的本地服务器检测到移动阅读器,则发送包含关于对象信息服务服务器的位置的信息的证书 以及对移动阅读器的认证值; 在移动阅读器处发送请求项目ID到附加到目标项目的标签的查询; 在所述标签处,通过使用所述认证值将所述项目ID加密到所述移动阅读器而生成的项目ID信息; 在所述移动阅读器处将所述物品ID信息和所述认证值发送到所述对象信息服务服务器; 并且在所述对象信息服务服务器处发送与所述项目ID相对应的在数据库中检索的数据,所述数据在所述认证值存在于所述数据库中时被检索。 本发明的物品信息提供方法和系统可以保证在购买前状态下的物品的信息的可靠性,并且防止信息在购买前和购买后状态被窃听。 此外,项目信息提供方法和系统可以防止标签ID被跟踪,从而保护购买者的隐私,防止标签被伪造,并提高计算效率。