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    Frequency correction in an OFDM (orthogonal frequency division multiplex) receiver
    1.
    发明公开
    Frequency correction in an OFDM (orthogonal frequency division multiplex) receiver 有权
    Einem OFDM（orthogonale Frequenzmultiplexierung）Empfänger中的Frequenzkorrektur

    公开(公告)号：EP0998085A1

    公开(公告)日：2000-05-03

    申请号：EP98308903.8

    申请日：1998-10-30

    申请人： FUJITSU TEN LIMITED

    发明人： Takayama, Kazuo ,  Nagami, Masaaki

    IPC分类号： H04L27/26

    CPC分类号： H04L27/2657 ,  H04L27/2679 ,  H04L27/2691

    摘要： An orthogonal frequency division multiplex mode receiver which quickly corrects a frequency deviation at the receiving side and transmitting side when receiving signals obtained by phase-modulating a plurality of orthogonal subcarriers, provided with a voltage-controlled oscillator (3) for generating a main carrier for reproducing a baseband signal from a received signal; a frequency analyzing unit (8) for finding levels and phase values of subcarriers by analyzing the frequency of the baseband signal and decoding symbols; and a frequency correction unit (16) for correcting the frequency deviation of the main carrier so that the level difference becomes a minimum by detecting the level difference occurring between adjoining subcarriers due to an inter-symbol interference due to the frequency deviation of the main carrier.
    The receiver is capable of quickly correcting the frequency by detecting amplitude variations due to frequency synchronization error on the receiver side by discriminating when variation is due to multipath disturbance and when variation is due to weak input.

    摘要翻译： 一种正交频分多路复用模式接收机，当接收到通过对多个正交子载波进行相位调制而获得的信号时，在接收侧和发送侧快速校正频率偏差，该电压控制振荡器用于产生主载波， 从接收信号再现基带信号; 频率分析单元，用于通过分析基带信号的频率和解码符号来发现子载波的电平和相位值; 以及频率校正单元（16），用于通过检测由于主载波的频率偏差引起的符号间干扰导致的相邻子载波之间出现的电平差，从而校正主载波的频率偏差，使得电平差变为最小 。 通过鉴别何时变化是由于多路径干扰以及当变化是由于弱输入引起的，接收机能够通过检测由于接收机侧的频率同步误差引起的振幅变化来快速校正频率。