High Performance PAPR Reduction Scheme with Digital Amplitude Pre distortion MIMO-OFDM Systems
T.Ganga Bhavani, U.Venu
Multiple-input multiple-output (MIMO), orthogonal frequency division multiplexing (OFDM), peak-to-average power ratio (PAPR), Predistortion.
The multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system, an attractive technique due to its robustness for time selective fading channels. The major drawback of orthogonal frequency division multiplexing (OFDM) systems is the high peak to average power ratio (PAPR), which results in signal distortion when the transmitter has nonlinear components. The MIMO-OFDM system also inherits from OFDM systems the drawback of high peak-to-average power ratio (PAPR) of the transmitted signal. The selected mapping (SLM) method is a major scheme for PAPR reduction. Unfortunately, computational complexity of the traditional SLM scheme is relatively high since it requires a number of inverse fast Fourier transforms (IFFTs). In this letter, a low-complexity PAPR reduction scheme is proposed for MIMO-OFDM systems, needing only one IFFT. The proposed scheme exploits the time-domain signal properties of MIMO-OFDM systems to achieve a low-complexity architecture for candidate signal generation. In such cases, PAPR reduction techniques may be resorted to help to improve the HPA efficiency.