摘要：High data rate and vulnerable are major challenges faced by present wireless communication systems since the demand for the internet and multimedia services are rapidly increasing and also the multimedia information are more secured in wired environment than in wireless environment. Orthogonal Frequency Division Multiplexing (OFDM) has been considered as a hopeful technique for to achieve high data rate transmission, it also has many advantages like spectral efficiency, robust to multipath fading effect, easy hardware implementation etc. Though OFDM has many advantages, it is highly sensitive to synchronization error. Since the error rate is increased and the system performance is degraded due to synchronization error, it seems to be a major problem in OFDM. An Inter-Symbol Pilot Aided Algorithm is used to overcome this problem which estimate and compensate the synchronization error. In this study, the data is secured using Hash Encryption Algorithm which introduces authentication and encryption in OFDM system, without impairing its spectral efficiency. In this study, an OFDM system is designed with improved security and synchronization which increases the overall efficiency of the system.
