PAPR Reduction Using Constant Modulus Algorithm and IDCT in MIMO-OFDM Networks

In MIMO-OFDM networks, the main drawback includes the large peak-to-average power ratio (PAPR) of the transmitter´s output signal on different antennas. In order to overcome this issue, PAPR is reduced using IDCT in this paper. In this technique, Inverse Discrete Cosine Transform (IDCT) along with constant modulus algorithm is used to reduce the PAPR in MIMO-OFDM networks. It involves two methods, first the time domain signal from the Resource Block is combined linearly using pre-coding weights which is transparent to the receiver side. Then the precoding weights are modified to decrease the modulus variations of the resulting signal, which leads to the reduction of PAPR in MIMO OFDM. By simulation results, it is observed that the proposed technique reduces PAPR.