DocumentCode
409650
Title
Block coded modulation for the QS-CDMA system
Author
Kim, Kyeong Jin ; Iltis, Ronald A.
Author_Institution
Nokia Res. Center, Irving, TX, USA
Volume
1
fYear
2003
fDate
9-12 Nov. 2003
Firstpage
423
Abstract
This paper proposes a novel introduction of the multidimensional multilevel block coded modulation (ML-BCM) to the quasi-synchronous CDMA (QS-CDMA) system, where the code delay uncertainty at the base station is limited to a small number of chips. To improve the performance of the QS-CDMA system, we employ the Leech-lattice based 24-dimensional BCM in the overall BCM-QS-CDMA modulation. The resulting transmitted constellation is more robust to fading. Computer simulation results show a significant coding gain compared to the uncoded and convolutional code based QS-CDMA systems.
Keywords
block codes; code division multiple access; convolutional codes; delays; modulation coding; QS-CDMA system; code delay uncertainty; coding gain; convolutional code; multidimensional multilevel block coded modulation; quasisynchronous code division multiple access; Base stations; Computer simulation; Convolutional codes; Delay; Fading; Modulation coding; Multiaccess communication; Multidimensional systems; Robustness; Uncertainty;
fLanguage
English
Publisher
ieee
Conference_Titel
Signals, Systems and Computers, 2004. Conference Record of the Thirty-Seventh Asilomar Conference on
Print_ISBN
0-7803-8104-1
Type
conf
DOI
10.1109/ACSSC.2003.1291946
Filename
1291946
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