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    • 2. 发明申请
    • METHOD FOR AUTOMATIC GAIN CONTROL BEFORE INITIAL SYNCHRONIZATION IN OFDM SYSTEM AND APPARATUS THEREOF
    • OFDM系统初始同步之前的自动增益控制方法及其设备
    • WO2006059829A3
    • 2006-11-02
    • PCT/KR2005001980
    • 2005-06-24
    • KOREA ELECTRONICS TELECOMMSAMSUNG ELECTRONICS CO LTDKT CORPSK TELECOM CO LTDKT FREETEL CO LTDHANARO TELECOM INCLEE YONG-SUPARK YOUN-OKKIM JUN-WOOBANG YOUNG-JO
    • LEE YONG-SUPARK YOUN-OKKIM JUN-WOOBANG YOUNG-JO
    • H03G3/30H04L27/26
    • H03G3/3078H04L27/2647H04L27/2662
    • The present invention relates to a method for automatic gain control (AGC) before an initial synchronization of a mobile station modem in OFDM system, and an apparatus thereof. The AGC apparatus includes: an initial synchronization inspector that verifies whether an initial synchronization for an input block sample (k) signal has been performed; a frame divider that divides a frame into predetermined intervals B(k) for the input block sample(k) signal in the case that the initial synchronization has not been performed; a reference value inspector that compares a difference value Pref-Pcalc, between a predetermined reference value Pref and sample data average energy Pcalc, with a predetermined value; a count controller that increases or decreases the count when the difference value Pref-Pcalc compared by the reference value inspector is greater or less than the predetermined value; a count inspector that inspects whether the count is greater or less than 0 when the input block sample (k) reaches a maximum value MAX; and a gain controller which increases or decreases the gain, level by level, according to the count inspection result of the count inspector.
    • 本发明涉及OFDM系统中的移动台调制解调器的初始同步之前的自动增益控制(AGC)的方法及其装置。 AGC装置包括:初始同步检查器,其验证是否已经执行了输入块样本(k)信号的初始同步; 在没有执行初始同步的情况下,对于输入块样本(k)信号将帧划分成预定间隔B(k)的帧分割器; 参考值检查器,将预定参考值Pref和采样数据平均能量Pcalc之间的差值Pref-Pcalc与预定值进行比较; 当由参考值检查器比较的差值Pref-Pcalc大于或小于预定值时增加或减少计数的计数控制器; 当输入块样本(k)达到最大值MAX时,检查计数是否大于或小于0的计数检查器; 以及根据计数检查员的计数检查结果逐级增加或减少增益的增益控制器。
    • 5. 发明申请
    • MULTI-FA PROCESSING SYSTEM AND ITS DIGITAL BAND-PASS FILTERING METHOD
    • 多FA处理系统及其数字带通滤波方法
    • WO2007066952A2
    • 2007-06-14
    • PCT/KR2006005201
    • 2006-12-05
    • KOREA ELECTRONICS TELECOMMYU BONG-GUKBANG YOUNG-JOKIM JIN-UP
    • YU BONG-GUKBANG YOUNG-JOKIM JIN-UP
    • H04B1/40H04L27/26
    • H04L5/06
    • A multi-channel processing system for selectively generating and transmitting/receiving a desired channel (FA: Frequency Assignment) signal and a band-pass filtering method thereof are provided. The multi-channel processing system includes a controller for receiving a channel selection signal including ON/OFF information of the respective channels and generating a filter coefficient corresponding to the channel selection signal; an input signal generator for generating an input signal; and a band-pass filter for changing a predetermined filter coefficient according to the filter coefficient generated by the controller and filtering the input signal from the input signal generator. Accordingly, since the controller can change the filter coefficient of the band-pass filter and selectively generate a channel, an efficient and simple multi-channel processing system using one band-pass filter regardless of the number of generated channels may be provided.
    • 提供了用于选择性地生成和发送/接收期望信道(FA:Frequency Assignment)的多信道处理系统及其带通滤波方法。 多信道处理系统包括:控制器,用于接收包括各个信道的ON / OFF信息的信道选择信号,并产生对应于信道选择信号的滤波器系数; 用于产生输入信号的输入信号发生器; 以及带通滤波器,用于根据由控制器产生的滤波系数改变预定的滤波器系数,并对来自输入信号发生器的输入信号进行滤波。 因此,由于控制器可以改变带通滤波器的滤波器系数并选择性地产生信道,所以可以提供使用一个带通滤波器的有效且简单的多信道处理系统,而不管生成的信道的数量。