Abstract: This paper presents a blind detection method for the IPR-OFDM (Interleaving and Phase Rotation- Orthogonal Frequency Division Multiplexing) system. The proposed method is used to recover the interleaving order and detect the received data in the receiver. How to recover the original information in the receiver is the main motivation in this paper. In the IPR-OFDM system, it uses interleavers to produce permutations of the input data frame. To recovery the data, the receiver must know the interleaving order in the transmitter. In IPR-OFDM system, the Side Information(SI) is used to get it. But in this letter, a blind rate detection approach for CDMA systems can be modified and applied to the receiver structure. The interleaving order is obtained by the CRC (Cyclic Redundancy Check) and reverse SER information mainly. The blind detection can increase the channel capacity compared to that of SI method.