Analysis of OFDM systems for high bandwidth application

Abstract

Orthogonal Frequency Division Multiplexing is one of the enhanced communication techniques which makes the emerging fourth generation (4G) and fifth generation (5G) communication possible. Because of multipath propagation & noise the performance of OFDM system is affected by channel leakage. OFDM channel is analyzed to estimate the channel leakage, MSE — Mean Square Error and SNR — Signal to Noise Ratio using DWT — Discrete Wavelet Transforms Techniques. And the major problem found in an OFDM system is high PAPR — Peak to Average Power Ratio of the OFDM signal. Generally the OFDM transmitter system consists of an HPA — High Power Amplifier which is used to obtain sufficient power to the transmitted signals. However this HPA has limited range, the OFDM signals with high PAPR value gets distorted by the non-linearity of HPA which adds more interference to the system. This work proposes DWT for analyzing the channel estimation and PTS — Partial Time Sequence to reduce PAPR in a 16 QAM OFDM system.