MT-005: Noise Power Ratio (NPR)-A 65-Year Old Telephone System Specification Finds New Life in Modern Wireless Applications
نویسنده
چکیده
The concept of Noise Power Ratio (NPR) has been around since the early days of frequency division multiplexed (FDM) telephone systems. The NPR is simply a measure of the "quietness" of an unused channel in a multi-channel system when there is random activity on the others. Noise and intermodulation distortion products fall into the unused channel causing less than ideal performance. Originally used to check 4-kHz wide voice channels in FDM links, the same concept is useful today in characterizing multichannel wideband communication systems—but there are some important differences in the modern measurement techniques.
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تاریخ انتشار 2009