RT Conference Proceedings
T1 Capacity per Unit-Energy of Gaussian Random Many-Access Channels
A1 Ravikumaran Nair, Jithin
A1 Koch, Tobias Mirco
AB We consider a Gaussian multiple-access channel with random user activity where the total number of userslₙ and the average number of active users kₙ may be unbounded. For this channel, we characterize the maximum number of bits that can be transmitted reliably per unit-energy in terms of lₙ and kₙ . We show that if kₙ log lₙ is sublinear in n, then each user can achieve the single-user capacity per unit-energy. Conversely, if kₙ log lₙ is superlinear in n, then the capacity per unit-energy is zero. We further demonstrate that orthogonal-access schemes, which are optimal when all users are active with probability one, can be strictly suboptimal.
PB IEEE
SN 978-1-7281-6432-8
YR 2020
FD 2020-08-24
LK https://hdl.handle.net/10016/30902
UL https://hdl.handle.net/10016/30902
LA eng
NO Proceeding of: 2020 IEEE International Symposium on Information Theory (ISIT), Los Angeles, CA, USA, 21-26 June 2020
NO J. Ravi and T. Koch have received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant No. 714161). T. Koch has further received funding from the Spanish Ministerio de Economía y Competitividad under Grants RYC-2014-16332 and TEC2016-78434-C3-3-R (AEI/FEDER, EU).
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RD 1 sept. 2024