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Type: Artigo de evento
Title: Coding For Ffh-cdma Systems - Part I: Capacity And Cutoff Rate
Author: De Deus Junior G.A.
Portugheis J.
Abstract: This paper considers a Fast Frequency-Hopping Code Division Multiple Access (FFH-CDMA) system used in a mobile radio environment. In the receiver, Maximum Likelihood (ML) detection with un-quantized detector outputs implies the use of a nonlinearity of difficult implementation. To approximate this nonlinearity, we propose to use an unique perceptron. The system performance with this approximation is almost identical to ML detection. A system with un-quantized detector outputs can support a considerable greater number of simultaneous active users then a system with hard quantization of outputs. By calculating the capacity (per dimension.) and the cutoff rate of the FFH-CDMA systems, we show that hard limiting of detector outputs can also significantly degrade system performance or reduce the number of active users. ©2006 IEEE.
Rights: fechado
Identifier DOI: 10.1109/ISSSTA.2006.311785
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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