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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

On the sum capacity of a T-user N-frequency multiple access channel with noise

Texto completo
Autor(es):
Sharma, Manish [1] ; Portugheis, Jaime [1]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Estadual Campinas, Fac Elect & Comp Engn, Campinas, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS; v. 21, n. 1, p. 23-29, JAN 2010.
Citações Web of Science: 1
Resumo

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. (AU)

Processo FAPESP: 06/00330-7 - Receptores iterativos para canais de acesso múltiplo
Beneficiário:Manish Sharma
Modalidade de apoio: Bolsas no Brasil - Doutorado