On MC-CDMA transmission system performance at nonlinear high power amplifier of transmitter over frequency selective fading channel

The study in this paper underlines the importance of correct joint selection of the spreading codes at the transmitter side and detector at the receiver side in the uplink multi-carrier code division multiple access transmission system model (MC-CDMA) in the presence of frequency selective fading environment and nonlinear distortion due to high power amplifier (HPA). For the precise overall performance, different spreading sequences (Walsh code, Gold code, orthogonal Gold code, Golay code and Zadoff-Chu code) and different kinds of receivers (minimum mean-square error receiver (MMSE-MUD) and microstatistic multi-user receiver (MSF-MUD)) are considered in this paper. In order to show the benefits of applying MSF-MUD over MMSE-MUD in presented environment, different computer simulations have been arranged. The results of our analysis will show, that the application of MSF-MUD in combination with Golay codes can outperform significantly the other tested spreading codes and receivers in AWGN as well as in frequency selective fading environment.