Author : Madhvi Jangalwa

Orthogonal Frequency-Division Multiplexing (OFDM) is a multicarrier transmission scheme. It has various advantages like easy and efficient in dealing with multi-path, robust against narrow-band interference, supports various modulation schemes and perfect for Multiple Input Multiple Output (MIMO) technique. OFDM is combined with MIMO, called MIMO-OFDM. This improves the bandwidth efficiency of the system and increase the capacity of the system. This technique is used in fourth generation (4G) mobile radio communication. OFDM has one major drawback of high Peak to Average Power Ratio (PAPR). This high PAPR is reduced by the clipping method. In which a threshold value of the amplitude is set. If amplitude of the multicarrier modulated signal is more than the threshold value then the signal is clipped. A big advantage of clipping is that PAPR reduction is obtained without any redundancy and no side information is needed to transmit but there is some distortion in data received at receiving end. Simulation result shows that clipping technique improves the PAPR and degrades the Bit Error Rate (BER) performance. In addition, for various clipping levels PAPR and bit error rate is investigated.

Keywords: OFDM, MIMO, MIMO-OFDM, PAPR, BER.

Article published in International Journal of Current  Engineering  and Technology, Vol.3,No.5(Dec- 2013)