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- Hierarchical_modulation abstract "Hierarchical modulation, also called layered modulation, is one of the signal processing techniques for multiplexing and modulating multiple data streams into one single symbol stream, where base-layer symbols and enhancement-layer symbols are synchronously overplayed before transmission. Hierarchical modulation is particularly used to mitigate the cliff effect in digital television broadcast, particularly mobile TV, by providing a (lower quality) fallback signal in case of weak signals, allowing graceful degradation instead of complete signal loss. It has been widely proven and included in various standards, such as DVB-T, MediaFLO, UMB (Ultra Mobile Broadband, a new 3.5th generation mobile network standard developed by 3GPP2), and is under study for DVB-H.Hierarchical modulation is also taken as one of the practical implementations of superposition precoding, which can help achieve the maximum sum rate of broadcast channels. When hierarchical-modulated signals are transmitted, users with good reception and advanced receivers can demodulate multiple layers. For a user with a conventional receiver or poor reception, it may only demodulate the data stream embedded in the base layer. With hierarchical modulation, a network operator can target users of different types with different services or QoS. However, traditional hierarchical modulation suffers from serious inter-layer interference (ILI) with impact on the achievable symbol rate.".
- Hierarchical_modulation thumbnail Layering.png?width=300.
- Hierarchical_modulation wikiPageExternalLink login.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F4519623%2F4536597%2F04536685.pdf%3Farnumber%3D4536685&authDecision=-203.
- Hierarchical_modulation wikiPageExternalLink freesrchabstract.jsp?tp=&arnumber=1433080&queryText%3DA+hierarchical+modulation+for+upgrading+digital+broadcast+systems%26openedRefinements%3D*%26searchField%3DSearch+All.
- Hierarchical_modulation wikiPageExternalLink paper_loader.cfm?pid=520.
- Hierarchical_modulation wikiPageExternalLink WP01_DVB-T%20Hierarchical.pdf.
- Hierarchical_modulation wikiPageID "7679585".
- Hierarchical_modulation wikiPageRevisionID "561515459".
- Hierarchical_modulation hasPhotoCollection Hierarchical_modulation.
- Hierarchical_modulation subject Category:Quantized_radio_modulation_modes.
- Hierarchical_modulation subject Category:Radio_resource_management.
- Hierarchical_modulation type Abstraction100002137.
- Hierarchical_modulation type Attribute100024264.
- Hierarchical_modulation type Manner104928903.
- Hierarchical_modulation type Property104916342.
- Hierarchical_modulation type QuantizedRadioModulationModes.
- Hierarchical_modulation comment "Hierarchical modulation, also called layered modulation, is one of the signal processing techniques for multiplexing and modulating multiple data streams into one single symbol stream, where base-layer symbols and enhancement-layer symbols are synchronously overplayed before transmission.".
- Hierarchical_modulation label "Hierarchical modulation".
- Hierarchical_modulation sameAs m.047vq1x.
- Hierarchical_modulation sameAs Q5753120.
- Hierarchical_modulation sameAs Q5753120.
- Hierarchical_modulation sameAs Hierarchical_modulation.
- Hierarchical_modulation wasDerivedFrom Hierarchical_modulation?oldid=561515459.
- Hierarchical_modulation depiction Layering.png.
- Hierarchical_modulation isPrimaryTopicOf Hierarchical_modulation.
