Carrier Frequency Offset Estimation for OFDM Transmissions

Abstract

FDMA, TDMA and CDMA are well known multiplexing techniques used in wireless communication systems. While working with the wireless systems using these techniques, various problems encountered are multi-path fading, inter- symbol interference (ISI), lower bit rate capacity, requirement of larger transmit power for high bit rate and less spectral efficiency. In a typical terrestrial broadcasting, the transmitted signal arrives at the receiver using various paths of different lengths. Since multiple versions of the signal interfere with each other, it becomes more difficult to extract the original information. The use of Orthogonal Frequency Division Multiplexing (OFDM) technique provides better solution for the above mentioned problems.