A Robust Carrier Frequency Offset Estimation Algorithm in Burst Mode Multicarrier CDMA based Ad Hoc Networks

The future wireless communication systems demand very high data rates, anti-jamming ability and multiuser support. People want large amount of to be continuously accessible in their personal devices. Direct Sequence (DS) spread spectrum based techniques such as Code Division Multiple Access (CDMA) fulfil these requirements but, at the same time, suffer from Intersymbol Interference (ISI). Multicarrier CDMA (MC-CDMA) is an emerging technology used mobile devices operating ad hoc setting due its immunity towards ISI having all advantages communication. One major problems with MC-CDMA sensitivity carrier frequency offsets caused inherent inaccuracy crystal oscillators. This offset destroys orthogonality subcarriers resulting Intercarrier (ICI). In this paper, we propose a computationally efficient algorithm on Fast Fourier Transform (FFT) biquadratic Lagrange interpolation. FFT use overlapping windows for each frame instead non-overlapping windows. gives coarse estimate which refined by successive application quadratic interpolation samples vicinity peak. proposed has been applied network simulated Stanford University Interim (SUI) channels. It shown simulations that provides better performance almost 1~2 dB compared well-known algorithms.