Artículos de revistas
On the sum capacity of a T-user N-frequency multiple access channel with noise
Registro en:
European Transactions On Telecommunications. John Wiley & Sons Ltd, v. 21, n. 1, n. 23, n. 29, 2010.
1124-318X
WOS:000274670500003
10.1002/ett.1351
Autor
Sharma, M
Portugheis, J
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) In this paper, we investigate the sum capacity of a noisy multiple access channel (MAC): the T-user N-frequency noiseless MAC in cascade with a noisy channel. The noisy channel includes frequency-selective Rayleigh fading and Additive White Gaussian Noise (AWGN). The receiver may use multiuser detection (MUD) or singly user detection (SUD). We show that when using SUD, the uniform distribution achieves sum capacity. Considering MUD and assuming that all users have the same input distribution, we show through numerical optimisation, that, for most relevant values of T and N, a product of uniform input distributions maximises a tight upper bound on sum capacity. Numerical results were obtained and it was observed that, for fixed N, there is a value of T which maximises sum capacity. As expected, the results also show that there is a significant gain in sum capacity when MUD is used. Copyright (C) 2009 John Wiley & Sons, Ltd. 21 1 23 29 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) FAPESP [06/00330-7]