Hyperspectral imaging is a key remote sensing technology. The explosive growth in hyperspectral image data volume (several TBs per orbit) and instrument data rates (in the range of 20 Gbps), compete with limited avail...
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ISBN:
(数字)9781665490054
ISBN:
(纸本)9781665490054
Hyperspectral imaging is a key remote sensing technology. The explosive growth in hyperspectral image data volume (several TBs per orbit) and instrument data rates (in the range of 20 Gbps), compete with limited available on-board storage resources and downlink bandwidth, making hyperspectral image data compression a mission critical on-board data processing task. In order to provide continuous and reliable data transfer from the on-board systems to the ground stations, channelcoding is being applied at the end of the data processing pipeline to guarantee reliable communications even at low signal-to-noise ratio regimes. Moreover, erasure correcting codes working on information packets rather than bits or symbols, can provide downlink reliability in future RF and optical links especially when Automatic Repeat Queuing (ARQ) strategies are either problematic or impossible due to specific service delay constraints and intermittent connectivity. Committed to the vision for "Space Technology Designed in Greece", in this special session paper, we provide an overview of cutting-edge technology high-performance hardware accelerators developed in the NKUA Digital Systems and Computer Architecture Laboratory (DSCAL), applicable to next-generation payloads for earth observation, optical/RF communication and connectivity, including CCSDS hyperspectral image compression and channel-coding at bit-level and packet-level.
In this paper, we compare and analyze the performance of short length error correcting codes in underwater OFDM system. In order to obtain a diversity gain, repeatedly allocated short data is transmitted. For the expe...
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ISBN:
(纸本)9781728108933
In this paper, we compare and analyze the performance of short length error correcting codes in underwater OFDM system. In order to obtain a diversity gain, repeatedly allocated short data is transmitted. For the experiment, Convolutional code, Turbo code, BCH code are applied to frames with length of 1s, 2s, and 3s. The performance was analyzed using Bell-hop channel simulation and real ocean experiment. As a result, BCH code showed the best performance when transmitting short-length data. And diversity gain can be obtained using repeated assignment transmission.
To improve the power-spectral efficiency trade-off of intensity-modulated direct-detection (IM/DD) optical transmissions, enhanced unipolar orthogonal frequency-division multiplexing (eU-OFDM) was recently introduced....
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ISBN:
(纸本)9781509001330
To improve the power-spectral efficiency trade-off of intensity-modulated direct-detection (IM/DD) optical transmissions, enhanced unipolar orthogonal frequency-division multiplexing (eU-OFDM) was recently introduced. Uncoded eU-OFDM systems have been presented in literature but coding techniques to further improve the reliability of transmissions over such systems have not yet been explored. Applying off-the-shelf codes to these systems does not lead to the best performance. In this paper, we propose a novel structured encoding-decoding architecture that is suitable for successive interference cancellation (SIC) required in eU-OFDM. Simulation results obtained so far show that the proposed code structure outperforms the off-the-shelf coded systems.
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