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Performance and Operating Characteristics Analysis of the 16-APSK Modulation over Nonlinear Channels  

Kang, Seok-Heon (서강대학교 전자공학과 디지털전송연구실)
Kim, Sang-Tae (서강대학교 전자공학과 디지털전송연구실)
Sung, Won-Jin (서강대학교 전자공학과 디지털전송연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.4C, 2007 , pp. 362-369 More about this Journal
Abstract
APSK (Amplitude Phase Shift Keying) digital modulation is characterized by the circular positioning of the transmission symbols in the constellation diagram. Due to such structural characteristics, the peak-to-average power ratio of the APSK modulation is lower than that of the QAM (Quadrature Amplitude Modulation), and the amount of performance degradation over nonlinear channels can be mitigated. The APSK modulation scheme has recently been adopted as satellite communication system standards including the DVB-S2 (Digital Video Broadcasting - Satellite, Version 2). In this paper, a BER (Bit Error Rate) upper bound approximation formula is derived using the channel model with the output power saturation characteristics, and its accuracy is demonstrated. Using the derived formula, the input power level that minimizes the BER is determined. The optimized performance based on the radii ratio of the 16APSK constellation and the channel saturation level is also presented.
Keywords
APSK modulation; QAM modulation; Nonlinear channels; Bit error analysis; Satellite communication systems;
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