Prediction and PAPR reduction in precoded MIMO-OFDM

摘要

Emerging multimedia applications require high data rates and reliability which can be met by MIMO-OFDM. Precoding at the transmitter can lead to increased link reliability and this requires channel state information (CSI) at the transmitter. CSI can be obtained through channel prediction. A high peak-to-average power ratio (PAPR) of the transmitted signal on each antenna proves to be a major drawback of MIMO-OFDM. If PAPR is not reduced, it will restrict MIMO-OFDM systems for practical applications. This paper studies the effect of two PAPR reduction techniques, namely clipping and peak insertion (PI) in precoded MIMO-OFDM. Channel prediction is done exploiting the temporal correlation existing among MIMO-OFDM signals. The performance of PAPR reduction techniques and channel prediction is studied through simulations and the PI method is found to provide greater PAPR reduction than clipping method.