Title :
Performance of the differential space-time block code modulation for the wideband CDMA system
Author :
Umali, Edwin M. ; Cajole, R.D. ; Marciano, Joel Joseph S
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Philippines, Philippines
Abstract :
The differential space-time block code (DSTBC) modulation for DS-CDMA system Liu, J et al., (2002) combines the merits of differential detection based on space-time block codes and spread spectrum technology to improve the performance of CDMA systems in a fast time-dispersive fading channel. In this paper, the new modulation scheme is adapted to a wideband CDMA system operating at a chip rate of 3.84 Mchips/sec and an output data rate of 240 kbits/sec. Simulation results indicate a 13-dB loss in performance when compared to a DSTBC-CDMA system. This loss can be attributed to the high autocorrelation values of the spreading codes.
Keywords :
block codes; broadband networks; code division multiple access; correlation theory; fading channels; modulation coding; space-time codes; spread spectrum communication; 240 kbits/s; DS-CDMA system; DSTBC; autocorrelation value; differential space-time block code modulation; direct sequence-code division multiple access; modulation scheme; spread spectrum technology; spreading code; time-dispersive fading channel; wideband system; Base stations; Block codes; Diversity reception; Fading; Modulation coding; Multiaccess communication; Receiving antennas; Spread spectrum communication; Transmitting antennas; Wideband;
Conference_Titel :
TENCON 2004. 2004 IEEE Region 10 Conference
Print_ISBN :
0-7803-8560-8
DOI :
10.1109/TENCON.2004.1414647
