Optimum power allocation for multiuser OFDM with arbitrary signal constellations
This paper formulates power allocation policies that maximize the region of mutual informations/nachievable in multiuser downlink OFDM channels. Arbitrary partitioning of/nthe available tones among users and arbitrary modulation formats, possibly different for/nevery user, are considered. Two distin...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2008 |
| País: | España |
| Institución: | Universitat Pompeu Fabra |
| Repositorio: | Repositorio Digital de la UPF |
| OAI Identifier: | oai:repositori.upf.edu:10230/16144 |
| Acceso en línea: | http://hdl.handle.net/10230/16144 http://dx.doi.org/10.1109/TCOMM.2008.060211 |
| Access Level: | acceso abierto |
| Palabra clave: | Tractament del senyal Comunicacions mòbils, Sistemes de Ràdio -- interferències Gaussian channels Power allocation Waterfilling Mercury/waterfilling Mutual information MMSE OFDM Downlink |
| Sumario: | This paper formulates power allocation policies that maximize the region of mutual informations/nachievable in multiuser downlink OFDM channels. Arbitrary partitioning of/nthe available tones among users and arbitrary modulation formats, possibly different for/nevery user, are considered. Two distinct policies are derived, respectively for slow fading/nchannels tracked instantaneously by the transmitter and for fast fading channels known/nonly statistically thereby. With instantaneous channel tracking, the solution adopts the/nform of a multiuser mercury/waterfilling procedure that generalizes the single-user mercury//nwaterfilling introduced in [1, 2]. With only statistical channel information, in contrast,/nthe mercury/waterfilling interpretation is lost. For both policies, a number of limiting/nregimes are explored and illustrative examples are provided. |
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