セキュリティ・ネットワーク領域のHE助教とリム准教授が国際会議ITNAC 2021においてBest Paper Awardを受賞

 セキュリティ・ネットワーク領域のHE, Cuiwei助教リム 勇仁准教授が国際会議31st International Telecommunication Networks and Applications Conference(ITNAC 2021)においてBest Paper Awardを受賞しました。

 ITNAC 2021は、令和3年11月24日~26日にかけてバーチャルで開催されました。これまでは、オーストラリアとニュージーランドを拠点に開催されていました。
 この会議は、分散・モバイル・コグニティブ・クラウドコンピューティング、コンピュータ・データ通信、ローカル・メトロポリタンネットワーク、光・有線・無線通信ネットワークや、アプリケーションのモデリングとシミュレーションに関連する研究成果を発表するための国際会議及びフォーラムです。IEEE Computer SocietyとIEEE Communications Societyが技術的に協賛しています。

 この会議で発表されたすべての論文の中から、一つの論文がBest Paper Awardに選定されました。


Linear and Non-linear Signal Reconstruction for Clipping Noise Mitigation in Optical OFDM

Cuiwei He and Yuto Lim

In this paper, a new decision-directed signal reconstruction (DDSR) algorithm is proposed for clipping noise mitigation in optical orthogonal frequency division multiplexing (OFDM). OFDM is increasingly being considered as the modulation method for the next-generation intensity modulation/direct detection (IM/DD) based optical transmission systems. When optical OFDM is used, clipping noise remains one of the main challenges. In previous studies, a time-domain based DDSR algorithm has been used to effectively mitigate the clipping noise. In this algorithm, based on the preliminary data detection decisions, an unclipped version of the OFDM signal is reconstructed non-linearly which can be decoded with better performance compared with the conventional OFDM signal detection method. However, due to the influences of the unavoidable noise at the receiver, many clipped signal samples cannot be correctly processed which significantly limits the advantages of using this algorithm. In this paper, a new linear signal reconstruction method is proposed. Using this linear approach, all clipped signal samples can be successfully updated in the signal reconstruction process which consequently mitigates the clipping noise more effectively compared with the previous non-linear methods. Simulation results are presented to show that, when this new form of DDSR method is used, the bit error rate (BER) performance of the system is significantly improved compared with both the conventional receiver and the previous non-linear DDSR receiver.

It was a great honor for us to receive the Best Paper Award from ITNAC 2021. We will take it as an encouragement for our future works.