Abstract: When more than two carriers are present in a channel, third-order intermodulation interference can be created by the multiplication of three fundamental carriers; this is called carrier triple beats (CTB). These spurious signals (CTB) are in-band at a level 6 dB higher than the third-order intermodulation products created from two signals because there is no second harmonic involved in the production of the interference signal. The level of CTB interference is further enhanced by the fact that multiple CTB signals can occur in the same frequency band.
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