It is shown, that Noise Power Ratio (NPR) testing of multichannel Single Sideband (SSB) transmitters should be performed loading all channels with identical white, gaussian, zero-mean noise signals in order to obtain the worst case result. A theoretical analysis of bichannel equipment under the two different input conditions: (a) statistically independent noise signals, and (b) statistically dependent noise signals; shows that the intermodulation distortion on the output of the transmitter is the same for either case. This result is extended for an arbitrary number of channels to the point of showing that the test results obtained for statistically dependent noise inputs will be either equal to or worse than those obtained for statistically independent noise inputs. The theoretical conclusions made for a bichannel transmitter are verified by means of practical measurements performed on such a transmitter.
Library of Congress Subject Headings
Radio, Single-sideband; Communication; Noise
Department, Program, or Center
Microelectronic Engineering (KGCOE)
Vinther, Per, "Noise Power Ratio testing of multichannel single sideband communication equipment" (1969). Thesis. Rochester Institute of Technology. Accessed from
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