Joint Estimation of CFO and Channel Estimation for Rayleigh Fading Channel with Kalman Filter for OFDM System
Journal Title: International Journal of Research in Computer and Communication Technology - Year 2014, Vol 3, Issue 6
Abstract
Due to its high data rate transmission capability with high bandwidth efficiency and its robustness to multipath delay, the Orthogonal Frequency Division Multiplexing (OFDM) has recently been applied widely in wireless communication systems. In mobile radio applications, the relative motion between the receiver and the transmitter gives rise to a time varying channel and as a result, channel estimation is essential to acquire the channel so as to coherently decode the received signals. Also, the main problem with carrier frequency offset (CFO) is, it introduces ICI (Inter Carrier Interference) among the sub carriers in OFDM signal. This paper discusses the joint channel estimation in OFDM system using LS, MMSE and using Kalman filter and also discusses the CFO (Carrier Frequency Offset) estimation in OFDM system using Pilot symbols. The performances of all schemes are compared by finding the MSE and BER at different SNR values and at different CFO values at pilot locations, where QAM modulation scheme was used.
Authors and Affiliations
M. Harikrishna Reddy, K. Rajendra Prasad
Keywords
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