| 1. |
- Bao, Yicheng, et al.
(författare)
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SimNet : Simplified deep neural networks for OFDM channel estimation
- 2020
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Ingår i: 2020 3rd IEEE International Conference on Information Communication and Signal Processing, ICICSP 2020. - : Institute of Electrical and Electronics Engineers Inc.. ; , s. 348-352
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Konferensbidrag (refereegranskat)abstract
- In this paper, a simplified deep neural network is proposed, which can be used for channel estimation and signal detection in OFDM system and reduce complexity. To be specific, the method of deep learning is introduced to optimize the channel estimation module of OFDM system. By building deep neural networks and training parameters at the signal-to-noise ratio of 10dB and 25dB, respectively, the channel estimation results can be optimized at a wider range of signal-to-noise ratio. In addition, the influence of training model size for channel estimation and signal detection is also researched. Compared with some other artificial intelligence aided OFDM receivers, proposed deep neural networks has shorter training time and simpler architecture. The simulation results show that by using proposed deep neural networks and training method in OFDM channel estimation, smaller mean square error and lower bit error rate can be obtained, especially in the case of clipping distortion and wide range of signal-to-noise ratio.
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| 2. |
- Jiang, Zeyu, et al.
(författare)
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Enhanced Interface Charge Transfer of Z-Scheme Photocatalyst by Br Substitution at the Bay Position in Perylene Tetracarboxylic Diimide
- 2020
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Ingår i: Solar RRL. - : WILEY-V C H VERLAG GMBH. - 2367-198X. ; 4:10
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Tidskriftsartikel (refereegranskat)abstract
- Z-scheme heterojunction photocatalysts (ZsHP) have attracted significant attention due to their excellent carrier recombination suppression and charge potential enhancement properties. However, the photocatalytic performance of ZsHP is limited by inefficient charge transfer at the heterojunction interface, mainly due to electron trapping by O-2 or H+ in part B and the large energy gap between its conduction band (CB) and the valence band (VB) of part A. Herein, perylene tetracarboxylic diimide (PTCDI, part B) and g-C3N4 (part A) are used to fabricate an organic ZsHP (PI-g-C3N4) as a novel strategy to significantly improve interfacial charge transfer efficiency by tailoring the Br substitution at the PTCDI bay position. Br substitution at the bay position reduce electron trapping in part B and bring the CB of part B closer to the VB of part A. Moreover, Br substitution enhance the electric field from g-C3N4 to PTCDI, enhancing the interfacial charge transfer of the ZsHP. These findings enable the design of ZsHP with tunable interface electron-transfer efficiencies.
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