Title :
Block spreading for MUI/ISI-resilient generalized multi-carrier CDMA with multirate capabilities
Author :
Wang, Zhengdao ; Giannakis, Georgios B.
Author_Institution :
Minnesota Univ., Minneapolis, MN, USA
Abstract :
The potential increase in capacity along with the need to provide multimedia services and cope with multiuser interference (MUI) and intersymbol interference (ISI) arising due to wireless multipath propagation, motivate well multirate wideband code-division multiple-access (CDMA) systems. This paper develops an all-digital block-spread filterbank framework capable of encompassing single- or multi-rate transceivers for asynchronous or quasi-synchronous CDMA transmissions through multipath channels. Thanks to symbol blocking and through appropriate design of user codes, the resulting generalized multi-carrier (GMC) CDMA system guarantees symbol recovery irrespective of the (possibly unknown) FIR multipath channels in both downlink and uplink setups with low complexity FIR receivers. Simulations corroborate that the novel GMC-CDMA system outperforms existing multirate alternatives in the presence of asynchronism and multipath
Keywords :
broadband networks; channel bank filters; code division multiple access; digital filters; intersymbol interference; land mobile radio; multimedia communication; multipath channels; multiuser channels; radio links; radio networks; spread spectrum communication; transceivers; FIR multipath channels; GMC-CDMA system; MUI/ISI-resilient generalized multicarrier CDMA; all-digital block-spread filterbank; asynchronous CDMA transmission; block spreading; downlink; intersymbol interference; linear receivers; low complexity FIR receivers; multi-rate transceivers; multimedia services; multipath channels; multirate systems; multirate wideband code-division multiple-access; multiuser interference; quasi-synchronous CDMA transmission; simulations; single-rate transceivers; symbol blocking; symbol recovery; uplink; user code design; wireless multipath propagation; Downlink; Filter bank; Finite impulse response filter; Intersymbol interference; Multiaccess communication; Multimedia systems; Multipath channels; Multiple access interference; Transceivers; Wideband;
Conference_Titel :
Communications, 2000. ICC 2000. 2000 IEEE International Conference on
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-6283-7
DOI :
10.1109/ICC.2000.853742
