Noise, especially signal-to-noise ratio (SNR), is a fundamental issue in wireless receivers. High noise levels can limit the capacity, coverage, and many related characteristics that have a significant impact on system operators and end users. In some cases, SNR can be improved by increasing transmission power, but it is often limited by regulations and power consumption. Due to cost, available power, and space issues, designers need to be very cautious in controlling the SNR of the receiver in most cases
They usually control SNR based on the performance goals/"performance budget" of each module, thereby optimizing the noise performance of the wireless system. For all modules, effective noise performance depends on how much noise it adds (compared to gain); Therefore, the correct measurement method is to calculate the SNR difference between the input/output of each module. The ratio of this ratio, expressed logarithmically, is the noise figure
To optimize noise performance, it is necessary to be able to accurately measure the noise figure of components and subsystems.
. It is best to make these measurements convenient enough at any time during the design phase of the receiver
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