M. Kojima, A. Hashimoto, Yoichi Suzuki, Takeshi Kimura, S. Tanaka
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引用次数: 4
Abstract
We are studying 16APSK and 32APSK, which can transmit more HDTV programs per channel or be applied for high quality services beyond HDTV. Multi-level modulations such as these APSK schemes are vulnerable to the non-linear distortion of a satellite transponder. We propose a compensation technique for estimating the signal point error vectors over a satellite simulator in advance and compensating for the error vectors of each signal point at the transmitter. We report on both 16APSK and 32APSK performances in terms of the required C/N and optimum operating point of the traveling wave tube amplifier (TWTA) by using a computer simulation on the effect of this compensation technique.
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