Analysis of adaptive modulated & turbo coded OFDM systems under imperfect channel estimation

Scope of thesis we analyzed bit-error-ratio (BER) of 4/8/16/32/64 QAM modulated OFDM systems in most used communication channel model which is called Awgn and multipath Rayleigh under perfect channel estimation. By adding turbo coding which is technique of forward-error-correction (FEC), 4/8/16/32/64 QAM modulated OFDM Systems bit-error-ratio also analyzed. All analysis simulation works realizer in Matlab environment.In this thesis, Adaptive Modulation as 4/8/16 QAM is applied to QAM modulated OFDM Systems and bit-error-ratio simulations are made under perfect channel estimation. Supporting by turbo coding bit-error-ratio simulations are gained for adaptive modulated OFDM systems under perfect channel estimation.Adaptive modulated and turbo coded OFDM systems are supporting by pilot and analyzed under imperfect channel estimation. Simulation results by calculating bit-error-ratio under perfect and imperfect channel estimation are also compared. Added to this effective throughput analysis is included in this work.