Provided by: International Journal of Advanced Research in Computer Science and Software Engineering (IJARCSSE)
Date Added: Sep 2014
In this paper, the authors have proposed a higher order QAM i.e. 256-HQAM where non-uniform signal constellation with hierarchical oriented OFDM modulator is used to provide lesser BER and higher efficiency in the compressed image data at lower channel Signal to Noise Ratio (SNR). Hierarchical Quadrature Amplitude Modulation (HQAM) enables unequal priority transmission with the help of irregularly spaced constellations hierarchical quadrature amplitude modulation, a modification of QAM, offers Unequal Error Protection (UEP) to the transferred bits for increasing the protection to the transferred bits as well as it is also efficient in bandwidth and power.