A Novel Constellation Design for 22n+1-QAM
一种新的22n+1阶QAM星座图设计

This paper studies the constellations of 22n+1-Quadrature Amplitude Modulation (QAM), and proposed a square QAM constellation which can build its mapping list according to the Gray coding rules. To compare the square constellation with the cross constellation and the rectangle constellation, the signal power efficiency of these three constellations and their BER performance is simulated, taking 32QAM for example. The simulation results show that square constellation has better BER performance than the other two. Moreover, the signal power efficient of square constellation is as well as that of cross constellation and rectangle constellation to the multi-carrier communication systems.