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    • 6. 发明授权
    • System and method for re-synchronizing a phase-independent first-in first-out memory
    • 用于重新同步相位独立的先进先出存储器的系统和方法
    • US06400706B1
    • 2002-06-04
    • US09285287
    • 1999-04-02
    • Kevin S. Cousineau
    • Kevin S. Cousineau
    • H04J306
    • H04J3/0632
    • A re-synchronizing phase-independent first-in first-out (FIFO) memory aligns digital data transmitted between receive shelves and digital shelves in the gateway transceiver subsystem (GTS) of a low orbit (LEO) satellite system. RF data transmitted from an LEO satellite is segmented into multiple receive shelves designed to filter and sample a large volume of information. The receive shelves filter the data, down convert the data to an IF frequency range and clock the data into the digital shelves, where demodulator ASICs demodulate the data to retrieve an original signal sent by a mobile radio-telephone user. The resynchronizing phase-independent FIFO memory uses separate input clock (CLK_IN) signals and input synchronization (EVEN_SEC) signals to align data leaving the receive shelves. It also uses an independent timed output clock (CLK_OUT) signal and an independent output synchronization (SYNC_OUT) signal to align the same data as it goes into the digital shelves. This prevents the isochronous (same frequency) signals from being phase misaligned due to disadvantageous Doppler effects or component characteristics.
    • 重新同步相位独立的先进先出(FIFO)存储器对准在低轨道(LEO)卫星系统的网关收发器子系统(GTS)中的接收货架和数字货架之间传输的数字数据。 从LEO卫星发送的RF数据被分割成多个接收架,其设计用于过滤和采样大量信息。 接收架对数据进行过滤,将数据下变频为IF频率范围,并将数据进时数据传送到数字货架,解调器ASIC对数据进行解调,以检索移动无线电话用户发送的原始信号。 重新同步的相位独立FIFO存储器使用单独的输入时钟(CLK_IN)信号和输入同步(EVEN_SEC)信号来对准离开接收架的数据。 它还使用独立的定时输出时钟(CLK_OUT)信号和独立的输出同步(SYNC_OUT)信号来对齐与数字货架相同的数据。 这可以防止同步(相同频率)信号由于不利的多普勒效应或分量特性而相位不对准。