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    • 8. 发明授权
    • Non-invasive digital cable test system
    • 无创数字电缆测试系统
    • US06278730B1
    • 2001-08-21
    • US09409557
    • 1999-09-30
    • Ernest T. TsuiJeffrey Marc Kletsky
    • Ernest T. TsuiJeffrey Marc Kletsky
    • H04B346
    • H04L1/242H04B17/0087H04B17/23H04B17/391H04L43/00H04L43/50
    • Method and apparatus for non-invasive testing of digital communications systems. Amplitude measurements are made for multiple frequencies of a multi-frequency communication system, converted to the time domain. An adaptive filter output is matched to the time domain representation to characterize the channel. Impedance mismatches may be precisely located using this technique. An error signal representing a difference between a signal transmitted through the channel and a received signal is estimated and analyzed. The error signal is separated into components corresponding to contributions by wide band noise, residual phase modulation, and residual amplitude modulation. Identification and removal of narrow-band interferers may occur prior to this separation. Bit error rate and system margin computations employ a Monte Carlo simulation of the various error sources. This provides a well refined estimate of bit error rate and system margin.
    • 数字通信系统非侵入式测试方法和装置。 对多频通信系统的多个频率进行幅度测量,转换为时域。 自适应滤波器输出与时域表示匹配以表征信道。 可以使用这种技术精确地定位阻抗失配。 估计和分析表示通过信道发送的信号与接收信号之间的差异的误差信号。 误差信号被分成对应于宽带噪声,残余相位调制和残余幅度调制的贡献的分量。 识别和去除窄带干扰源可能在分离之前发生。 误码率和系统容限计算采用蒙特卡罗模拟各种误差源。 这提供了对误码率和系统余量的精确估计。