# 효율적 성좌도 배치법을 사용하는 DAPSK 시스템 설계와 성능 평가

• An, Changyoung (Department of Electronics Engineering, Chungbuk National University) ;
• Ryu, Sang-Burm (Payload Electronics Team, Korea Aerospace Research Institute) ;
• Lee, Sang-Gyu (Payload Electronics Team, Korea Aerospace Research Institute) ;
• Ryu, Heung-Gyoon (Department of Electronics Engineering, Chungbuk National University)
• 안창영 (충북대학교 전자공학과) ;
• 유상범 (한국항공우주연구원 탑재체전자팀) ;
• 이상규 (한국항공우주연구원 탑재체전자팀) ;
• 유흥균 (충북대학교 전자공학과)
• Accepted : 2018.09.07
• Published : 2018.09.30

#### Abstract

In satellite communications, a modulation technique with a low peak-to-average power ratio, high transmission efficiency, and low bit error rate(BER) is required, and differential amplitude and phase shift keying(DAPSK) modulation technique has been appraised as a technology that meets these requirements. However, because conventional DAPSK modulation uses a regular constellation diagram, the Euclidean distance between the symbols in the inner concentric circles of the constellation are quite short. Such a characteristic degrades the BER. In this paper, we propose a DAPSK system that uses an efficient constellation assignment to improve the performance of existing DAPSK systems and evaluate the performance of the proposed scheme. From the simulation results, we confirm that the proposed 16-DAPSK system achieves an signal-to-noise ratio gain of 0.8 dB over the conventional approach at a BER condition of $10^{-4}$ when the number of symbols used in the symbol detector of the receiver is 2.

#### Acknowledgement

Supported by : 한국항공우주연구원, 한국연구재단

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