Abstract
Composite-triple-beat (CTB) in cable TV systems, which degrades the BER performance of digital modulation signal. is discussed. In multi-carrier transmission systems, the non-linearity of a laser diode or an amplifier causes a number of intermodulation products. In this report, the computer simulation demonstrates the behavior of intermodulation noise. The results show that the amplitude distribution of CTB differs from Gaussian noise and depends on the number of transmission carriers and intermodulation products. Thermal noise to intermodulation noise ratio at the same symbol error rate and BER performance of 256-QAM affected by CTB are also calculated
