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    • 8. 发明授权
    • Carrier recovery circuit and demodulation circuit under quasi-coherent detection method
    • 载波恢复电路和解调电路的准相干检测方法
    • US08675778B2
    • 2014-03-18
    • US13505346
    • 2010-11-05
    • Eisaku SasakiHirotaka Sato
    • Eisaku SasakiHirotaka Sato
    • H04L27/00H03K9/00
    • H04L27/2273H04L27/3827H04L2027/0057H04L2027/0069H04L2027/0081
    • A carrier recovery circuit, adapted to a demodulation circuit according to a quasi-coherent detection method for generating baseband signals by way of quadrature detection on a received signal having an intermediate frequency, rotates phases of baseband signals; detects a phase error and an amplitude error; controls a bandwidth of a loop filter based on its difference, eliminates a high-frequency component from the phase error; and performs phase rotation based on the phase error eliminating its high-frequency component. It expands the bandwidth of the loop filter when a difference between the phase error and the amplitude error is greater than a predetermined threshold, whilst reducing bandwidth of the loop filter upon determining that the amplitude error decreases due to a reduction of the bandwidth of the loop filter. This optimizes the bandwidth of the loop filter to follow variations of the C/N ratio of the received signal, improving bit error rate.
    • 根据用于通过对具有中频的接收信号进行正交检测来生成基带信号的准相干检测方法的解调电路的载波恢复电路,旋转基带信号的相位; 检测相位误差和振幅误差; 基于其差异来控制环路滤波器的带宽,从相位误差中消除高频分量; 并根据消除其高频分量的相位误差进行相位旋转。 当相位误差和幅度误差之间的差异大于预定阈值时,扩展环路滤波器的带宽,同时在由于环路带宽的降低导致振幅误差减小时减小环路滤波器的带宽 过滤。 这优化了环路滤波器的带宽,以遵循接收信号的C / N比的变化,从而提高误码率。