Performance comparison of MC-CDMA and cyclically prefixed DS-CDMA in an uplink channel [mobile radio]

This paper compares multi-carrier code division multiple access (MC-CDMA) with cyclically prefixed direct sequence CP-DS-CDMA in an uplink channel. For the CP-DS-CDMA scheme, we propose an MMSE-based multi-user detection (MUD) technique, which recovers code orthogonality among users destroyed by frequency-selective fading in the frequency domain. On the other hand, it is well known that the peak to power average ratio (PAPR) of a single carrier transmission scheme is lower than that of a multi-carrier transmission scheme. Thus, from the viewpoint of the PAPR issue, this paper studies the effect of resolution bits of the digital to analog converter (DAC) at the transmitter and the analog to digital converter (ADC) at the receiver on both schemes. Then, this paper evaluates the performance of the two schemes by computer simulations.