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Numerical study of the performance improvement of the APSK transmission system using zero-nulling method.

We have studied the transmission performance of amplitude and phase shift keying (APSK) format theoretically. As there is a trade-off between the performance of amplitude shift keying (ASK) and phase shift keying (PSK) through the extinction ratio of the ASK format, zero-nulling method to improve the performance of the PSK format had been proposed. A demerit of the zero-nulling method is a reduction of the total capacity. This paper described the effectiveness of the zero-nulling method when the total capacity of the system was identical.