Study of some Peak-to-Average Power Ratio reduction techniques in MIMO-OFDM system

Orthogonal frequency division multiplexing (OFDM) is a multicarrier modulation technique which utilizes the available spectrum in an efficient manner and provides high data rate transmission. Apart from this, OFDM is also considered to be a promising technique for power efficiency, multipath delay spread tolerance and robustness to the frequency selective fading channels. OFDM when used in combination with Multiple-input Multiple-output configuration increases the diversity gain and system capacity. This diversity is used to mitigate the impairments of wireless channels. With all these advantages, MIMO-OFDM has become the key technique for next generation WLAN and 4G mobile communications. It is used in IEEE 802.11n, IEEE 802.1 6m and LTE. However, MIMO-OFDM system faces the Peak-to-Average Power Ratio (PAPR) problem which results in many restrictions for practical applications. This paper reviews and analyzes some of the important PAPR reduction techniques on the basis of different parameters.