Clustered assign code selecting peak power reduction for MC-CDMA

MC-CDMA has attracted significant attention as one of the downlink communication methods for fourth generation mobile communication systems. However, like the other non-spreading multi-carrier systems, MC-CDMA has a peak power problem. We propose a novel peak power reduction technique for MC-CDMA using code selection at the transmitter. The transmitter selects the code shift pattern from plural preassigned code shift patterns in each user cluster to minimize the output peak power of downlink signals. The proposed technique can achieve blind code detection of the transmitting codes at the receiver. However, since the detection performance degrades if the number of users increases, a code detection error recovery technique is also considered.