Sciweavers

Share
GLOBECOM
2008
IEEE

Multiple Access Outerbounds and the Inseparability of Parallel Interference Channels

8 years 8 months ago
Multiple Access Outerbounds and the Inseparability of Parallel Interference Channels
— 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 jointencoding across carriers, is 3/2 log(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.
Viveck R. Cadambe, Syed Ali Jafar
Added 29 May 2010
Updated 29 May 2010
Type Conference
Year 2008
Where GLOBECOM
Authors Viveck R. Cadambe, Syed Ali Jafar
Comments (0)
books