Papr reduction in OFDM using hybrid method
Aendapally, Yeshwanth Reddy
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Orthogonal frequency division multiplexing (OFDM) is a modulation technique which revolutionized the field of communications and paved the way for the modern-day 4G LTE communications. OFDM technique is used in both wired and wireless communications. This type of modulation technique offers low intersymbol interference and provides high data rates. Due to these advantages of OFDM it is used in various applications like 4G LTE communications, wireless networks and digital TV. Besides these advantages, a major disadvantage of OFDM system is high peak to average power ratio due to addition of sinusoidal waves in communication which result in peaks in the output and cause signal degradation. In order to reduce the PAPR, a hybrid technique which combines Hadamard transform and Hamming peak windowing is developed. This technique is compared with the PAPR results obtained for OFDM, Hamming windowing, and companding. The bit error rates of all the above methods are compared passing the OFDM signal through AWGN (additive white Gaussian noise) channel.