Secret information transmission scheme in MIMO system using time-variant pre-coding

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  • MIMOにおける時変化プリコーディングを用いた秘密情報伝送方式
  • MIMO ニオケル ジヘンカ プリコーディング オ モチイタ ヒミツ ジョウホウ デンソウ ホウシキ
  • MIMO ニ オケル トキ ヘンカ プリコーディング オ モチイタ ヒミツ ジョウホウ デンソウ ホウシキ
  • マイモ ニ オケル ジヘンカ プリ コーディング オ モチイタ ヒミツ ジョウホウ デンソウ ホウシキ

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Abstract

Recently, physical layer security technology such as secret key agreement and secret information transmission using radio propagation attracts attention in wireless communications. The authors proposed a MIMO system which applied signal dispersion and noise addition method as a secret information transmission scheme. However, this scheme is weak for the attack of the eavesdropper using independent component analysis (ICA). This paper generalized the earlier proposed method and derived the equivalent system using time-variant precoding. This paper also proposed the improvement method using the multi-level modulation and the update of reception antenna weight as a measure for the attack using ICA. As a result of computer simulation, it become clear that the proposed scheme has a satisfactory performance of bit error rate between authorized users and that the proposed scheme has a sufficient tolerance for the attack from eavesdropper.

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