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    • 4. 发明授权
    • Timing synchronization in wireless communication system
    • 无线通信系统中的定时同步
    • US07936856B1
    • 2011-05-03
    • US11854646
    • 2007-09-13
    • Chun-Ming KuoI-Ping ChangChi-Yeh YuShih-Kung ChangHo-Chi Huang
    • Chun-Ming KuoI-Ping ChangChi-Yeh YuShih-Kung ChangHo-Chi Huang
    • H04L7/00H04L27/06
    • H04L7/042H04B1/70755
    • A synchronization circuit includes a correlator, an energy calculator, a post-processing unit, and a decision device. The correlator correlates a received sequence r(t) with a local sequence c(i) to obtain a correlation result h(t). The energy calculator calculates an energy function of the correlation result h(t), and filters the energy function of the correlation result by a channel impulse response wc(l) to obtain a filtered energy function e(t), where l is the index of the channel impulse response. The post-processing unit applies weighting function wa(t) to the filtered energy e(t) to obtain a weighted energy function e′(t), wherein the weighting function wa(t) weights a central portion of the filtered energy function e(t). The decision device selects a maximum energy value from the weighted energy function e′(t), and the time index t with maximum energy value is the time shift of the received sequence and the local sequence.
    • 同步电路包括相关器,能量计算器,后处理单元和判定装置。 相关器将接收到的序列r(t)与局部序列c(i)相关,以获得相关结果h(t)。 能量计算器计算相关结果h(t)的能量函数,并且通过信道脉冲响应wc(l)对相关结果的能量函数进行滤波,以获得滤波能量函数e(t),其中l是索引 的信道脉冲响应。 后处理单元将加权函数wa(t)应用于经滤波的能量e(t)以获得加权能量函数e'(t),其中加权函数wa(t)对滤波能量函数e (t)。 决策装置从加权能量函数e'(t)中选择最大能量值,具有最大能量值的时间索引t是接收到的序列和局部序列的时间偏移。