Method for measuring the sensitivities and interference wave properties fo receivers

Abstract

A system enables highly accurate measurements to be performed automatically on test receivers, with good efficiency, irrespective of bit error rate vs. reception input level. The system is provided with two means for estimating the reception input level at which the bit error rate of a receiver will be a prescribed value. The estimation error in the first estimation means is estimated; when said error is smaller than the allowed value, the reception input level is estimated by the first estimation means, and when said error is larger than the allowed value, the operation is switched automatically to the second estimation means, and the reception input level is estimated by the second estimation means. In the first estimation means, the characteristic of the bit error rate is modeled by a second-order approximation equation and the reception input level Lx corresponding to the prescribed bit error rate Bs is obtained by calculation. The second-order approximation equation is obtained by the least squares method, after measuring the bit error rates corresponding to the reception input levels La-Le. The second estimation means uses a first-order approximation.

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