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- 2013-03-19
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Description: The concept of the noise power ratio (NPR) from the frequency division multiplexing (FDM) had emerged at the beginning of the birth of the telephone system. Nutshell, NPR used to measure multi-channel system when random events on the other channel, a the idle channel' s " quiet" level. Noise and intermodulation distortion products into the idle channel, thereby reducing performance. The concept was originally used to check the FDM link 4 kHz wide voice channel, now, in determining the characteristics of multi-channel broadband communication system is useful- but in modern measurement techniques, there are some important differences.
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MT-005 噪声功率比(NPR)—拥有65年历史的电话系统参数在现代无线应用中重获新生 .pdf
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