Frequency Offset Estimation in OFDM Systems using Threshold based Scheme

The Performance of the Orthogonal Frequency Division Multiplexing (OFDM) systems degrade due to Doppler frequency or frequency drift between transmitter and receiver oscillator which causes frequency offset and hence leads to a number of impairments in the received signal, thereby making its detection incorrect. In this paper, a threshold-based frequency offset estimation algorithm for orthogonal frequency division multiplexing (OFDM) systems is further analyzed. The algorithm shows robust performance in the presence of timing offset. The threshold used in correlation and coherence phase bandwidth lowers the computation complexity when compared with the existing schemes. Through a detailed analysis and simulation over AWGN channel, it has been shown that the scheme analyzed maintains the same level of estimation performance with lower complexity than the existing schemes. KeywordsFrequency offset, OFDM, synchronization, coherence phase bandwidth (CPB)