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June 2006 [Test & Measurement] Properly Understanding Noise In Test Applications Noise generators can serve as useful test tools in evaluating communications systems performance. They allow an operator to add a controlled amount of thermal noise to a reference signals to determine the effect of noise on system performance, such as bit-error rate (BER). Thermal noise conforms to a Gaussian probability density function (PDF) allowing a smooth transition from theoretical analysis to a test bench. For the most part, the output of a noise generator is... June 2006 [Test & Measurement] Evaluating Noise Sources By Gaussian Distribution A typical Gaussian distribution is generally plotted with the number of sigma, or standard deviations, shown on the horizontal (X) axis (see figure, left). When measuring the performance of a noise generator, a critical factor in assessing its usefulness is to compare its distribution with that of the ideal mathematical distribution shown above. Using the histogram feature on a spectrum analyzer makes it possible to... |
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