Title :
Performance of the multi phased MC-CDMA system with nonlinear amplifier
Author :
Ahn, Cheol Yong ; Ahn, Chi Hun ; Ryu, Seung Moon ; Kim, Dong Ku
Author_Institution :
Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea
Abstract :
Multi-code CDMA (MC-CDMA) can not only be integrated easily with a conventional system, but also achieve good spectral efficiency and high processing gain. However, it suffers from high value of peak-to-average power ratio (PAPR). In this paper, we propose a multi-phase CDMA (MP-CDMA) system that can provide variable rate service and is not susceptible to the nonlinear characteristics of the amplifier. The clipping is introduced at the output of the multi-code modulator and at the input of the MPSK modulator in order to improve the performance of the MPSK chip demodulator and reduce the system complexity. The system performance is compared for the different number of codes and different clipping levels. The optimum clipping level is also evaluated for a different number of codes in both AWGN and frequency flat fading channel.
Keywords :
AWGN channels; channel coding; code division multiple access; demodulators; fading channels; mobile radio; optimisation; phase shift keying; variable rate codes; AWGN channel; MP-CDMA; MPSK modulator; chip demodulator; codes; fourth generation mobile communication; frequency flat fading channel; multi-code modulator; multi-phase CDMA; nonlinear amplifier; optimum clipping level; performance; system complexity; third generation mobile communication; variable rate service; AWGN; Degradation; Demodulation; Fading; Frequency; Moon; Multiaccess communication; Multicarrier code division multiple access; Peak to average power ratio; Power engineering and energy;
Conference_Titel :
Wireless Communications and Networking Conference, 2002. WCNC2002. 2002 IEEE
Print_ISBN :
0-7803-7376-6
DOI :
10.1109/WCNC.2002.993528
