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Hard-Limiter Intermodulation with Low Input Signal-to-Noise Ratio

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1 Author(s)
Kirlin, R. ; Utah State Univ., Logan

A simple, closed form expression is derived for the normalized power magnitude of major intermodulation (IM) products at the output of an ideal bandpass hard-limiter with low input signal-to-noise ratio, (S/N)_{i} . This expression together with no-noise results obtained by a previous author allows quick plotting of the no-noise and high-noise asymptotes of the IM product magnitude vs. (S/N)_{i} , for any number of equal-power, input CW signals. Lastly, it is shown that for many signals it may be advantageous to operate the limiter at a lower (S/N)_{i} in order to suppress the intermodulation distortion.

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Communication Technology, IEEE Transactions on  (Volume:15 ,  Issue: 4 )