Efficient Implementation of Hybrid QAM using Golay Sequence
DOI:
https://doi.org/10.15662/IJEETR.2026.0802316Keywords:
AHQAM, QAM, Constellation size, Golay sequenceAbstract
Hierarchical quadrature amplitude modulation (HQAM) enables unequal priority transmission through the use of non-uniformly spaced constellations. We propose an adaptive HQAM (A-HQAM) scheme where the ratios between the constellation distances are regularly adjusted based on the channel condition with the objective of maximizing the transmission efficiency. For very-low-cost mobile terminals, it is desirable to have grossly nonlinear power amplifiers, which are simpler to implement and have higher amplification efficiency and output power. In this case, QAM modulations are strongly recommendable since the transmitted signals can have very low fluctuations. It should be pointed out that for QAM constellations the main degradation due to a short distance constellation mapping that leads to interference in In-phase and quadrature phase signals. For noninterference signals we uses golay sequence that provide make constellation sequence adapt to channel conditions. The proposed scheme offers reduced complexity by using one constellation size, unlike conventional adaptive schemes which require the use of several constellation sizes.
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