Title :
QAM with interference cancellation for high-speed multicode CDMA
Author :
Xia, Bin ; Wang, Jiangzhou
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ., China
Abstract :
The potential of multi-level modulation for forward link of multicode CDMA systems with interference cancellation to support high data rate service is studied. In third generation (3G) CDMA systems, multicode and/or multicarrier modulation schemes are used to support high data rate service, meanwhile, quadrature amplitude modulation (QAM) is a more promising candidate for transmission of even higher rate data due to its high spectrum efficiency. In this paper, the BER performance of the M-QAM WCDMA system with interference cancellation is evaluated. Numerical results show that a M-QAM wideband CDMA system is more sensitive to the channel estimation error. Moreover, with high quality channel estimates, 16-QAM or 64-QAM with multicode interference cancellation in the WCDMA system is more attractive to increase the system capacity.
Keywords :
3G mobile communication; code division multiple access; data communication; error statistics; interference suppression; multiuser channels; quadrature amplitude modulation; radio links; radiofrequency interference; 16-QAM; 3G CDMA systems; 64-QAM; BER performance; M-QAM WCDMA system; channel estimation error; forward link; high data rate service; high spectrum efficiency; high-speed multicode CDMA; multi-level modulation; multicarrier modulation; multicode interference cancellation; quadrature amplitude modulation; system capacity; third generation CDMA systems; wideband CDMA system; Bit error rate; Channel estimation; Data engineering; Degradation; Fading; Interference cancellation; Multiaccess communication; Performance analysis; Quadrature amplitude modulation; Quadrature phase shift keying;
Conference_Titel :
Spread Spectrum Techniques and Applications, 2002 IEEE Seventh International Symposium on
Print_ISBN :
0-7803-7627-7
DOI :
10.1109/ISSSTA.2002.1048578
