Conceptual Study of OFDM-Coding, PAPR Reduction, Channel Estimation

At present for high data rate transmission, Orthogonal Frequency Division Multiplexing (OFDM) which is one of multi-carrier modulation (MCM) techniques offers a considerable spectral efficiency; multipath delay spread tolerance, immunity to the frequency selective fading channels and power efficiency. As a result, OFDM has widely been deployed in many wireless communication standards such as Digital Video Broadcasting (DVB).In using turbo codes for OFDM performance can be sufficiently improved as seen in LTE standard systems. One of the challenging issues for Orthogonal Frequency Division Multiplexing (OFDM) system is its high Peak-to-Average Power Ratio (PAPR). In this paper we present turbo coded OFDM systems, its channel estimation scheme and methods for reducing PAPR in the system.