Institute of Electrical & Electronic Engineers
Orthogonal Frequency Division Multiplexing (OFDM) is of great importance in current wireless standards such as WiMAX, xDSL, DAB and DVB-T. It is also a key technology for next generation wireless communication systems. The notable advantages of OFDM include enhanced channel capacity, efficient hardware/software implementation, effective bandwidth utilization and robustness against frequency selective fading of wireless communication channels. It also enables the system to dynamically estimate the Channel Impulse Response (CIR) for both slow and fast fading scenarios and by exploiting some subcarriers as pilot tones. Note that the dynamic channel estimation allows employing coherent demodulation at the receiver side which, in turn, increases the throughput of the OFDM system at a given Signal to Noise Ratio (SNR).