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    • 5. 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。
    • 7. 发明申请
    • APPARATUS AND METHOD FOR ESTIMATING TIMING OFFSET IN A WIRELESS COMMUNICATION SYSTEM
    • 在无线通信系统中估计时序偏移的装置和方法
    • US20100150257A1
    • 2010-06-17
    • US12556023
    • 2009-09-09
    • Il-Gu LeeHun-Sik KangSok-Kyu Lee
    • Il-Gu LeeHun-Sik KangSok-Kyu Lee
    • H04L7/00H04L27/28H04B15/00
    • H04L27/2662H04L27/2657H04L27/2675
    • A method for estimating timing offset in an OFDM wireless communication system using preamble and pilot includes: estimating a carrier offset by using preamble included in a currently received OFDM packet and estimating a first timing offset based on the estimated carrier offset to thereby produce a first timing offset estimation value; estimating a second timing offset to thereby produce a second timing offset estimation value by transforming the OFDM packet into signals of frequency domain and using a pilot signal of the frequency-domain signals; checking a channel condition based on packet error information of a previously received packet to thereby produce error condition information, and selecting one between the first timing offset estimation value and the second timing offset estimation value based on the error condition information; and compensating data signals for timing offset among the frequency-domain signals the based on the selected timing offset estimation value.
    • 用于使用前导码和导频来估计OFDM无线通信系统中的定时偏移的方法包括:通过使用包括在当前接收的OFDM分组中的前导码来估计载波偏移,并且基于所估计的载波偏移来估计第一定时偏移,从而产生第一定时 偏移估计值; 通过将所述OFDM分组变换为频域的信号并使用所述频域信号的导频信号来估计第二定时偏移,从而产生第二定时偏移估计值; 基于先前接收到的分组的分组错误信息来检查信道条件,从而产生错误条件信息,并且基于所述错误条件信息在所述第一定时偏移估计值和所述第二定时偏移估计值之间进行选择; 以及基于所选择的定时偏移估计值,在频域信号之间补偿用于定时偏移的数据信号。