Open AccessImprovement of bit error rate performance of MC-CDMA system by using adaptive digital modulation schemes
Author(s) -
T. Jaya,
M. Monisha,
M. Meena,
C. Sharanya
Publication year - 2018
Publication title -
international journal of engineering and technology
Language(s) - English
Resource type - Journals
ISSN - 2227-524X
DOI - 10.14419/ijet.v7i2.33.14863
Subject(s) - computer science , bit error rate , electronic engineering , code division multiple access , phase shift keying , link adaptation , modulation (music) , multipath propagation , symbol rate , cdma spectral efficiency , transmission (telecommunications) , quadrature amplitude modulation , bandwidth (computing) , data transmission , channel (broadcasting) , computer network , telecommunications , engineering , fading , philosophy , aesthetics
In Wireless Communication, the transmission channel suffers due to multipath propagation and channel dispersion due to Inter Symbol Interference (ISI), thereby degrades the system performance greatly. Future communication requires high data rate and effective utilization of bandwidth. Hence, there is a need to improve the Bit Error Rate (BER). The proposed work is Adaptive Modulation (AM), combined with Multi Carrier Code Division Multiple Access (MC-CDMA) based transmission system. It is a promising way to increase the data rate and it uses bandwidth in a efficient manner. The Adaptive Modulation based MC-CDMA systems applied to a wide-area environment, can achieve high data rate up to 100Mbps. In this paper M-ary PSK, M-ary QAM and M-ary CPM modulation techniques are used. The Adap-tive modulation based MC-CDMA systems perform well for around 10 number of users. As a whole, the adaptive MC-CDMA system is found to give the optimum BER performance of given digital modulation schemes for fourth generation environment.