Actas de congresos
Coding For Ffh-cdma Systems - Part Ii: System Design
Registro en:
0780397800; 9780780397804
Ieee International Symposium On Spread Spectrum Techniques And Applications. , v. , n. , p. 317 - 321, 2006.
10.1109/ISSSTA.2006.311786
2-s2.0-46149120837
Autor
De Deus Junior G.A.
Portugheis J.
Institución
Resumen
In part I of this paper, the channel capacity per dimension of a Fast Frequency-Hoping Code Division MultipleAccess (FFH-CDMA) with unquantized detector outputs was evaluated and it showed that hard limiting of outputs can significantly degrade capacity. In this paper, a coded FFHCDMA system whose maximum likelihood receiver works with unquantized outputs is considered. With a matched bit-to-symbol conversion in transmitter, it is shown that a proper design criterion is to maximize symbol Hamming distance. Based on this new criterion, a search algorithm was developed and many good convolutional codes were found. Analytical and simulation results corroborated the effectiveness of the proposed design criterion. ©2006 IEEE.
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