TY  - JOUR
T1  - Quadrature Amplitude Modulation with Circular Boundary
AU  - Seong, Minuk 
AU  - Park, Sung-Joon 
JO  - The Journal of Korean Institute of Communications and Information Sciences
PY  - 2024
DA  - 2024/1/1
DO  - 10.7840/kics.2024.49.6.801
KW  - QAM
KW  - signal constellation
KW  - bits-to-symbol mapping
KW  - PAPR
KW  - power gain
AB  - In modern digital communication systems, square quadrature amplitude modulation with a high modulation order is widely used to increase spectral efficiency. In this paper, we propose a new quadrature amplitude modulation with a square lattice and a circular boundary and investigate its power gain and peak-to-average power ratio using heuristic and analytic methods. The results show that the proposed modulation provides a power gain of 0.2003 dB and a 33% reduction in the peak-to-average power ratio when compared with the conventional square quadrature amplitude modulation.