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    • 125. 发明申请
    • SYSTEM AND METHOD FOR ENHANCING THE PERFORMANCE OF WIDEBAND DIGITAL RF TRANSPORT SYSTEMS
    • 提高宽带数字射频运输系统性能的系统与方法
    • WO2007118195A1
    • 2007-10-18
    • PCT/US2007/066144
    • 2007-04-06
    • ADC TELECOMMUNICATIONS, INC.WALA, Philip M.
    • WALA, Philip M.
    • H04J3/16
    • H04J3/1647H04J3/1629
    • A system and method for enhancing the performance of wideband digital RF transport systems is disclosed, which enables the transport of different bandwidth segments on a plurality of wideband channels by selecting an optimal clock sample rate for each bandwidth segment to be transported. Thus, the bandwidth segments are proportionally allocated so that an optimum amount of bandwidth can be transported at the serial bit rate. As one example, a system for enhancing the performance of a wideband digital RF transport system is disclosed, which includes a transmit unit, a receive unit, and an optical transmission medium connected between the transmit unit and the receive unit. The transmit unit includes a plurality of wideband RF analog signal inputs coupled to a plurality of analog-to-digital, digital down-converter (A/D DDC) devices. Notably, the sample rate of each A/D DDC device is determined by a respective sample clock. The digitized wideband RF segments at the outputs of the A/D DDC devices are combined and converted to a frame structure, converted to serial form, and transmitted on the optical transmission medium to the receive unit. A light detector device in the receive unit detects the serial bit stream on the optical transmission medium, the serialized frames are converted back to the original frame format, and the original digitized wideband RF segments are reconstructed. Each digitized wideband RF segment is coupled to a respective D/A digital up-converter (D/A DUC) device associated with a particular wideband RF signal input on the transmit side. Notably, the output sample rate of each D/A DUC device is determined by a respective sample clock, which provides the same sample rate as that of the associated A/D DDC device in the transmit unit. The sample rate of each A/D DDC device (and associated D/A DUC device) is pre-selected so that the transmission medium can transport the optimum amount of RF bandwidth at the given serial bit rate.
    • 公开了一种用于增强宽带数字RF传输系统的性能的系统和方法,其通过为要传输的每个带宽段选择最佳时钟采样率来实现在多个宽带信道上的不同带宽段的传输。 因此,按比例地分配带宽段,使得可以以串行比特率传送最佳的带宽量。 作为一个示例,公开了一种用于增强宽带数字RF传输系统的性能的系统,其包括发送单元,接收单元和连接在发送单元和接收单元之间的光传输介质。 发射单元包括耦合到多个模数转换器(A / D DDC)装置的多个宽带RF模拟信号输入。 值得注意的是,每个A / D DDC设备的采样率由相应的采样时钟确定。 在A / D DDC设备的输出处的数字化宽带RF段被组合并转换成帧结构,转换成串行形式,并在光传输介质上传输到接收单元。 接收单元中的光检测器装置检测光传输介质上的串行比特流,将串行化帧转换回原始帧格式,并重构原始的数字化宽带RF段。 每个数字化宽带RF段被耦合到与在发射侧输入的特定宽带RF信号相关联的相应D / A数字上变频器(D / A DUC)设备。 值得注意的是,每个D / A DUC设备的输出采样率由相应的采样时钟确定,其提供与发送单元中相关联的A / D DDC设备相同的采样率。 预先选择每个A / D DDC设备(和相关联的D / A DUC设备)的采样率,使得传输介质可以以给定的串行比特率传输最佳的RF带宽量。