Matching Pursuitを用いた伝搬路推定のOFDMシステムへの応用

摘要

Although OFDM (Orthogonal Frequency Division Multiplex) is a promising technique capable of establishing broadband wireless transmission over a multipath fading environment, the transmission performance degrades due to inter-carrier interference (ICI) caused by the Doppler shift in receiving the signal on the fast moving vehicle. Recently, a combination of compressed sensing-based accurate channel estimation and ICI canceller has been proposed for solving this problem. The proposed method is capable of compensating for the degradation due to Doppler shift. Matching pursuit (MP) algorithm has been proposed as a computational-cost effective CS (Compressed Sensing) algorithm. In this paper, we show the performance of ISDB-T (Integrated Services Digital Broadcasting for Terrestrial) receiver with MP-based channel response estimator. Computer simulation result shows the proposed MP-assisted ISDB-T receiver is capable of improving the bit error rate performance.%OFDM(Orthogonal Frequency Division Multiplex)はマルチパスフェージング伝搬路において広帯域デジタル伝送を可能にする効果的な技術である.しかし,高速移動受信時ではドップラーシフトによるサブキャリア間干渉による伝送品質の劣化が問題となる.近年,圧縮センシングを用いた高精度伝搬路推定とサブキヤリァ間干渉キャンセラを組み合わせることによる高速移動受信特性の改善手法が提案されている.この手法は効果的に伝送特性の改善が可能となる.本報告では,OFDMシステムの一例としてISDB-T(Integrated Services Digital Broadcasting)地上デジタルテレビジョン放送のパラメータを取り上げ,これにMatching Pursuit(MP)法を用いた伝搬路推定手法を適用し,計算機シミュレーシヨンにより提案手法の有効性を確認する.