Title :
Performance of VSG-CDMA and MC-CDMA in multirate systems
Author :
Guo, Zihua ; Letaief, Khaled
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon, China
Abstract :
The performance of two multirate schemes in DS/CDMA systems, variable spreading gain (VSG-CDMA) and multicode (MC-CDMA) are compared. We first present the signal model for a multirate DS/CDMA system. Then, the performance in terms of asymptotic multiuser efficiency (AME), near-far resistance (NFR), and BER are evaluated. Some typical detectors are considered in multirate systems. These include the optimal maximum-likelihood detector, the sub-optimal linear detector, the interference canceller and the conventional MF detector. We show that in multirate systems, MC-CDMA has a very similar performance to VSG-CDMA employing low-rate detection (LRD). But it performs much better than VSG-CDMA employing high-rate detection (HRD). Furthermore, we show some important distinctions between multirate systems and single-rate systems
Keywords :
code division multiple access; error statistics; interference suppression; maximum likelihood detection; mobile radio; multiuser channels; optimisation; personal communication networks; spread spectrum communication; BER; DS-CDMA; IMT-2000; MC-CDMA; VSG-CDMA; W-CDMA; asymptotic multiuser efficiency; conventional MF detector; high-rate detection; interference canceller; low-rate detection; mobile communication; multicode CDMA; near-far resistance; optimal maximum likelihood detector; performance; signal model; sub-optimal linear detector; variable spreading gain CDMA; wideband-CDMA; wireless personal communication; AWGN channels; Bit error rate; Delay; Detectors; Interference cancellation; Maximum likelihood detection; Mobile communication; Multiaccess communication; Multicarrier code division multiple access; Performance gain;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd
Conference_Location :
Rhodes
Print_ISBN :
0-7803-6728-6
DOI :
10.1109/VETECS.2001.944893
