Code selecting peak power reduction for MC-CDMA

MC-CDMA has attracted significant attention as one of the down link communication method for fourth generation mobile communication systems. However, MC-CDMA has a peak power problem as well as the other non-spread multi-carrier systems. In this paper, we propose novel peak power reduction technique for MC-CDMA using code selection at the transmitter. In the proposed system, the transmitter selects the code shift pattern from plural pre-assigned code shift patterns in each user cluster to minimize the output peak power of down link signals. The proposed technique can achieve the blind code detection of transmitting codes at the receiver. However, the detection performance degrades if the number of users increases. So in this paper, a code detection error recovery technique is also considered. Keywords—MC-CDMA, peak power problem, code selection, code detection error recovering