2008•IEICE Transactions on CommunicationsRequires access

Numerical Study of APSK Format for Long-Haul Transmission and Its Performance Improvement by Zero-Nulling Method

H. Taga, Jwo-Yuh Wu, Wei-Tong Shih, Seng-Sheng Shu

Abstract

Transmission performance of amplitude and phase shift keying (APSK) format is studied theoretically. The extinction ratio of the amplitude shift keying (ASK) signal of the APSK format causes a trade-off of the performance between the ASK and the phase shift keying (PSK) signal of the APSK format. Then, zero-nulling method is proposed to improve the performance of the APSK format, and its effectiveness is confirmed by the numerical simulation.

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Key concepts: Amplitude and phase-shift keying, Amplitude-shift keying, Keying, Phase-shift keying, Computer science, Transmission (telecommunications), Ask price, Performance improvement