Abstract:

The Orthogonal frequency division multiplexing (OFDM) technology has the advantages of high bandwidth efficiency, resistance to multipath interference and so on. But its higher peak power is a major problem. A new mix signal spread spectrum technique is suggested to reduce the peak power of OFDM signals. By means of the technique, the time domain signals are divided into one continuous part and several discrete parts and sent out after interleaving. A partial signal restoration method is proposed to restore the signals in the receiver. Simulation results show that the peak power is decreased and the processing gain of the system can be gotten, thus improving the performance of the bit error ratio.