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    • 2. 发明申请
    • AUTOMATIC FREQUENCY CONTROL UNDER LOW SIGNAL-TO-NOISE CONDITIONS
    • 低信号噪声条件下的自动频率控制
    • US20120163426A1
    • 2012-06-28
    • US13331203
    • 2011-12-20
    • József G. NémethPéter Szilveszter Kovács
    • József G. NémethPéter Szilveszter Kovács
    • H04L27/00H04B1/10
    • H04L27/0014H04L2027/0046H04L2027/0065H04L2027/0071H04L2027/0095
    • Carrier frequency offset (CFO) is determined by sample-to-sample phase shifts of a digital radio signal. The CFO range is divided into a number of intervals and creates as many parallel derived streams as there are interval endpoints by pre-compensating (“back rotating”) the input by the sample-to-sample phase shift corresponding to the particular endpoint. Magnitude and phase values are computed of the correlation of a preamble pattern period with the preamble segment of each derived stream in parallel. The largest resulting magnitude value(s) are used to zoom in on the actual CFO present in the input stream. Improved accuracy in the presence of noise may be obtained by repeating the search for a shorter interval centered on the prior CFO value. Final CFO phase values from corresponding correlation computations then determine the actual CFO and corresponding sample-to-sample phase shift to be applied for pre-compensation (“back rotation”) in an open-loop AFC
    • 载波频率偏移(CFO)由数字无线电信号的采样到采样相移确定。 CFO范围被分为多个间隔,并通过对与特定端点相对应的采样到采样相移预先补偿(“反向旋转”)输入,创建与间隔端点一样多的并行导出流。 计算出前导码模式周期与并行的每个派生流的前导码段的相关性的幅度和相位值。 最大的最大幅度值用于放大输入流中存在的实际CFO。 通过重复搜索以先前CFO值为中心的较短间隔,可以获得噪声存在时的精度提高。 来自相应相关计算的最终CFO相位值然后确定在开环AFC中应用于预补偿(“反向旋转”)的实际CFO和对应的采样到采样相移