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- W2154162775 abstract "It is known that the capacity of parallel (multi-carrier) Gaussian point-to-point, multiple access and broadcast channels can be achieved by separate encoding for each subchannel (carrier) subject to a power allocation across carriers. In this paper we show that such a separation does not apply to parallel Gaussian interference channels in general. A counter-example is provided in the form of a 3 user interference channel where separate encoding can only achieve a sum capacity of $log({SNR})+o(log({SNR}))$ per carrier while the actual capacity, achieved only by joint-encoding across carriers, is $3/2log({SNR}))+o(log({SNR}))$ per carrier. As a byproduct of our analysis, we propose a class of multiple-access-outerbounds on the capacity of the 3 user interference channel." @default.
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- W2154162775 date "2008-01-01" @default.
- W2154162775 modified "2023-09-23" @default.
- W2154162775 title "Multiple Access Outerbounds and the Inseparability of Parallel Interference Channels" @default.
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- W2154162775 doi "https://doi.org/10.1109/glocom.2008.ecp.904" @default.
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