Performance Evaluations of Multi-Carrier CDMA System with Cyclic Shifted Scramble Code in Multi-path Fading Channel

In this paper, we evaluate the error rate of side information identification in multi-path fading environments. In previous study, we proposed peak-to-average power ratio (PAPR) reduction method for multi-carrier CDMA (MC-CDMA) signals named cyclic-shifted scramble code (CSSC). The CSSC utilizes a scramble code and pilot channel to reduce the PAPR of MC-CDMA signals. Transmitter sends the scramble code with some amount of cyclic shifts, which can be recognized as side information. Therefore, the receivers must extract the side information as accurate as possible. One problem of the method is destruction of orthogonality amongst pilot channel and user channels. The problem degrades the performances of both side information identification and data transmission (bit error rate and packet error rate). From the numerical results, CSSC performs well even in multi-path fading environment and is comparable to the case of perfect scramble code estimation