Hierarchical modulation: Difference between revisions

Revision as of 11:52, 24 October 2021

Revision as of 18:32, 12 May 2022

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==Example==

[[Image:Layering.png|frame|right|Layered Modulationmodulation Constellationconstellation]]

For example, the figure depicts a layering scheme with [[Phasephase-shift keying|QPSK]] base layer, and a [[Quadraturequadrature amplitude modulation|64QAM]] enhancement layer. The first layer is 2 bits (represented by the green circles). The signal detector only needs to establish which quadrant the signal is in, to recover the value (which is '10', the green circle in the lower right corner). In better signal conditions, the detector can establish the phase and amplitude more precisely, to recover four more bits of data ('1101'). Thus, the base layer carries '10', and the enhancement layer carries '1101'.

==Inter-layer interference==

{{expand section|date=September 2009}}

For a hierarchically-modulated symbol with QPSK base layer and 16QAM enhancement layer, the base-layer throughput loss is up to about 1.5bits5 bits/symbol with the total receive [[signal-to-noise ratio]] (SNR) at about 23 [[Decibeldecibel|dB]], about the minimum needed for the comparable non-hierarchical modulation, 64QAM. But unlayered 16QAM with the same SNR would approach full throughput. This means, due to ILI, about 1.5/4 = 37.5% loss of the base-layer achievable throughput. Furthermore, due to ILI and the imperfect demodulation of base-layer symbols, the demodulation error rate of higher-layer symbols increases too.

==See also==