Um estudo comparativo das constelações qam quadrada e nãoquadrada nos canais awgn com desvanecimento rayleigh

Abstract

M-QAM modulation, used in modern telecommunications, was created to increase the bit rate, for that, it combines the advantages of two modulation techniques, the phase modulation and the amplitude modulation. Amplitude modulation uses low bandwidth, and phase modulation provides noise immunity. This course completion work presents a study of the development of bit error probability equations. And from these equations, the performance of the M-QAM modulation in the constellations of the square and non-square types in the AWGN and Rayleigh channels is evaluated. The results show that both noise and fading degrade QAM modulation performance regardless of the constellation type.