| 摘要 |
<p>In a system for transmitting a digital signal over a signal path, such as a digital microwave radio, a method for finding worst case susceptibility of digital microwave radios to multipath fading. Signal notch depth at a given signal frequency is adjusted until a selected initial bit error rate occurs (100). Thereafter, the signal path is broken and then reestablished (110). If the measured bit error rate is greater than the initial bit error rate, the resulting bit error rate is measured, and the notch depth is decreased (130) and then gradually increased (140), until the measured bit error rate is equal to or slightly exceeds the initial bit error rate. If the measured bit error rate is equal to the initial bit error rate, the signal path is broken (110) and reestablished additional times until an accurate representation of worst case signal propagation is obtained. If the measured bit error rate is less than the initial bit error rate, the value of notch depth for the initial bit error rate is returned as the worst case value (160). In this way, worst case susceptibility of a digital microwave radio to multipath fading is indicated by notch depth.</p> |
