Inter-Carrier Interference Cancellation Based
on Cyclic Embedding for Multicarrier Communication Systems
Wang Xia,Zhu Shihua,Sun Delong
(School of Electronics and Information Engineering,Xi'an Jiaotong University,Xi'an
710049,China)
Abstract: In order to eliminate intercarrier interference(ICI) of orthogonal
frequency-division multiplexing (OFDM) communication systems, based on interference
coefficients analysis and reasonable estimation,a novel decorrelation interference
cancellation scheme using frequency-domain equalization was proposed.By using the cyclic
embedding algorithm of interference matrix,this scheme can directly eliminate intercarrier
interference and restrain the floor effect of systems.Compared to the conventional
frequency-domain equalization,the new scheme has better convergence reliability and lower
computational complexity without requiring the iterative operation and the inverse
operation of matrix,and is suitable for applying to the wireless multipath channel and
high speed mobile environments.Simulation results indicate that the signal-to-interference
ratio of the proposed scheme can be 32dB more than the standard OFDM system, 5dB more than
the interference self-cancellation scheme when the normalized frequency offset is 0.2,and
the signal-to-noise ratio of the proposed scheme can be increased 2¡«3dB when the bit
error ratio is 10-4.
Keywords:orthogonal frequency-division multiplexing;inter-carrier
interference;interference cancellation;equalization