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

Autor(es)

Sharma, Manish ^[1] ; Portugheis, Jaime ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Fac Elect & Comp Engn, Campinas, SP - Brazil

• 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