Improved ICI Self Cancellation Scheme for Phase Rotation Error Reduction in OFDM System
Keywords:
OFDM, Inter carrier interference, phase rotation error, carrier frequency offsetAbstract
Orthogonal frequency division multiplexing
(OFDM) is sensitive to carrier frequency offset (CFO).This CFO mainly occurs because of the frequency mismatch in the transmitter and the receiver. As a result, the orthogonality between the subcarriers are destroyed causing not only the inter carrier interference (ICI) in a sub carrier but also a phase rotation in the received complex signal. Due to the phase rotation of the received data the receiver decode the data
incorrectly.Several methods like self cancellation, modified self cancellation, pulse shaping, maximum Likelihood offset detection are developed to overcome the ICI problem. Self cancellation techniques are based on algorithms making use of symmetry and conjugate properties of the sub-carriers [1,2]. But none of these methods ensure the reduction of phase rotation problem. In this paper we have proposed a self
cancellation method which uses for sub carriers for a particular data transmission to reduce the Phase Rotation of the received signal. We have compared the phase rotation of the received signal with respect to the Carrier Frequency Offset (CFO) of our proposed scheme with the ICI Self Cancellation Schemes. From our simulation, we find that our proposed scheme provides less rotation to the received data for a particular CFO
than any other schemes.
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