When they did become commercially available they were large and expensive, and they were used to simulate the performance of analog signal processing to judge its effectiveness.

当它们确实在商业中使用时， 它们又笨重又昂贵，它们被用于模拟信号处理的演示仿真，以判断信号的有效性。

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The error-rate performance of the high-speed QPSK digital satellite communication system with cochannel large capacity FDM-PM signal interference is studied by means of computer simulation.

本文用计算机模拟的方法研究高速QPSK数字卫星系统受大容量FDM-FM信号同波道干扰时的系统误码特性。

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