OFDMにおけるキャリア間干渉の除去に関する一検討

概要

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In OFDM transmission, a loss of sub-carrier orthogonality due to Doppler-spread of the channel leads to inter-carrier interference (ICI).We have proposed a method to reduce the ICI caused by the Doppler spread ofthe channel.The transmission channel is modeled by a combination of multipleDoppler-shifted propagation paths, and their parameters such asattenuation, relative delay and Doppler-shift are estimated usingscattered pilot symbols.The ICI is canceled by multiplying the inverse matrix of theestimated channel matrix with the received OFDM symbol vector.However, the ICI canceller causes enhancement of noise component,so it can't improve the bit error rate characteristics sufficiently.In this paper, we propose the new ICI canceller based on MMSE which does notcause enhancement of noise component.Computer simulation confirmed that the ICI canceller based on MMSE canreduce the bit error rate under the Doppler-spread channel.
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