DocumentCode :
798141
Title :
Performance of broadband multicarrier DS-CDMA using space-time spreading-assisted transmit diversity
Author :
Yang, Lie-Liang ; Hanzo, Lajos
Author_Institution :
Sch. of Electron. & Comput. Sci., Univ. of Southampton, UK
Volume :
4
Issue :
3
fYear :
2005
fDate :
5/1/2005 12:00:00 AM
Firstpage :
885
Lastpage :
894
Abstract :
In this contribution multicarrier direct-sequence code-division multiple-access (MC DS-CDMA) using space-time spreading (STS)-assisted transmit diversity is investigated in the context of broadband communications over frequency-selective Rayleigh-fading channels. We consider the issue of parameter design for the sake of achieving high-efficiency communications in various dispersive environments. Furthermore, in contrast to conventional MC DS-CDMA schemes employing time (T)-domain spreading only, in this contribution we also investigate broadband MC DS-CDMA schemes employing both T-domain and frequency (F)-domain spreading, i.e., employing TF-domain spreading. The bit-error rate (BER) performance of STS-assisted broadband MC DS-CDMA is investigated for downlink transmissions associated with the correlation based single-user detector and the decorrelating multiuser detector. Our study demonstrated that when appropriately selecting the system parameters, broadband MC DS-CDMA using STS-assisted transmit diversity constitutes a promising downlink transmission scheme. This scheme is capable of supporting ubiquitous communications over diverse communication environments without BER performance degradation.
Keywords :
Rayleigh channels; broadband networks; channel coding; code division multiple access; dispersive channels; diversity reception; error statistics; multiuser detection; radio links; space-time codes; spread spectrum communication; time-frequency analysis; BER; bit-error rate; broadband multicarrier DS-CDMA; dispersive channel; downlink transmission scheme; frequency-domain spreading; frequency-selective Rayleigh-fading channel; multicarrier direct-sequence code-division multiple-access; multicarrier modulation; multiuser detection; space-time spreading-assisted transmit diversity; time-domain spreading; ubiquitous communication; Bit error rate; Broadband communication; Context; Decorrelation; Detectors; Dispersion; Downlink; Frequency diversity; Multiaccess communication; Rayleigh channels; Broadband system; code-division multiple access (CDMA); frequency-domain spreading; frequency-selective fading; multicarrier CDMA; multicarrier direct-sequence code-division multiple-access (MC-DS-CDMA); multicarrier modulation; multiuser detection; space–time spreading (STS); transmit diversity;
fLanguage :
English
Journal_Title :
Wireless Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1276
Type :
jour
DOI :
10.1109/TWC.2005.847099
Filename :
1427679
Link To Document :
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