Enhancement of MC-CDMA performance system using Rotated Modulation

Abstract

The transmission system with high data rate and high mobility is needed. However, the system is susceptible to frequency selective fading and fast fading. We propose MC - CDMA system with Rotated Modulation that be able to solve the problems. MC - CDMA is a combination of OFDM and CDMA system which offer high spectral efficiency. However, this system still requires high power, so in this study Rotated Modulation is added to reduce the power. Rotated Modulation implements rotating signal constellation and use quadrature and inphase interleaver. The simulations result show MC - CDMA with Rotated Modulation produce a system that require less power compared with MC-CDMA non Rotated Modulation systems.