Title :
Influence of adaptive multicoding on mutual information and channel capacity for uncertain wideband CDMA fading channels
Author :
Barton, Richard J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Houston Univ., TX, USA
Abstract :
We consider the problem of adaptive modulation for broadband DS-CDMA fading channels with imperfect channel state information. The goal is to adapt the dimension and geometry of the signal constellation within the subspace spanned by a collection of random spreading codes (multicoding) in order to improve system performance in the presence of uncertainty regarding the true state of the channel.
Keywords :
adaptive modulation; channel capacity; code division multiple access; fading channels; quadrature amplitude modulation; random codes; spread spectrum communication; DS-CDMA; M-QAM; M-ary quadrature amplitude modulation; adaptive modulation; adaptive multicoding; broadband fading channels; channel capacity; imperfect channel state information; mutual information; random spreading codes; signal constellation; uncertain wideband fading channels; Channel capacity; Channel state information; Constellation diagram; Fading; Geometry; Multiaccess communication; Mutual information; System performance; Uncertainty; Wideband;
Conference_Titel :
Information Theory Workshop, 2002. Proceedings of the 2002 IEEE
Print_ISBN :
0-7803-7629-3
DOI :
10.1109/ITW.2002.1115450
