The (24, 12) extended Golay code contains eight disjoint subcodes. Each subcode can be constructed from 24 (real) orthogonal base vectors. It further contains 64 sub-subcodes that are equivalent to a three-dimensional...
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The (24, 12) extended Golay code contains eight disjoint subcodes. Each subcode can be constructed from 24 (real) orthogonal base vectors. It further contains 64 sub-subcodes that are equivalent to a three-dimensional universe code. This structure enables us to use partial correlation between the received vector and the base vectors to perform ideal correlation decoding. The correlation decoder can be implemented with a 64-flop and an 8-flop Hopfield neural network plus some housekeeping logic.
In this correspondence, decoding that uses soft-decision information but with multiple low-complexity decoders are investigated. These decoders correct only errors and erasures. The structure of the receiver consists ...
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In this correspondence, decoding that uses soft-decision information but with multiple low-complexity decoders are investigated. These decoders correct only errors and erasures. The structure of the receiver consists of a bank of z demodulators followed by errors- and erasures-correcting decoders operating in parallel. Each demodulator has a threshold for determining when to erase a given symbol. We assign a cost f(theta) to the noise for causing an erasure when the receiver uses a particular threshold theta and a (larger) cost f(theta) for causing an error. The goal in designing the receiver is to choose the thresholds to maximize the noise cost which is necessary to cause a decoding error. We demonstrate that the above formulation is solvable for many channels including the M-ary input-output channel, the additive channel with coherent demodulation, and an additive channel with orthogonal modulation and noncoherent demodulation. Then we show that the maximum worst case error-correcting capability of the parallel decoding algorithms is the same as the maximum worst case error-correcting capability of a correlation decoder with the same number of quantization regions.
In this paper, we propose a novel three-dimensional imaging method by which the object is captured by a coded cameras array (CCA) and computationally reconstructed as a series of longitudinal layered surface images of...
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In this paper, we propose a novel three-dimensional imaging method by which the object is captured by a coded cameras array (CCA) and computationally reconstructed as a series of longitudinal layered surface images of the object. The distribution of cameras in array, named code pattern, is crucial for reconstructed images fidelity when the correlation decoding is used. We use DIRECT global optimization algorithm to design the code patterns that possess proper imaging property. We have conducted primary experiments to verify and test the performance of the proposed method with a simple discontinuous object and a small-scale CCA including nine cameras. After certain procedures such as capturing, photograph integrating, computational reconstructing and filtering, etc., we obtain reconstructed longitudinal layered surface images of the object with higher signal-to-noise ratio. The results of experiments show that the proposed method is feasible. It is a promising method to be used in fields such as remote sensing, machine vision, etc. (c) 2006 Elsevier GmbH. All rights reserved.
A new efficient modulation code for holographic memory. or 9 : 12 pseudo-balanced code(9-12PBC), has been developed and evaluated. The proposed code is partitioned into 16 codeword subsets and is decoded in conjunctio...
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A new efficient modulation code for holographic memory. or 9 : 12 pseudo-balanced code(9-12PBC), has been developed and evaluated. The proposed code is partitioned into 16 codeword subsets and is decoded in conjunction with Viterbi algorithm. The results of numerical simulations and actual recording experiments show that 9-12PBC gives favorable trade-off between code rate and bit error rate(BER) performance.
A new efficient modulation code for holographic memory. or 9 : 12 pseudo-balanced code(9-12PBC), has been developed and evaluated. The proposed code is partitioned into 16 codeword subsets and is decoded in conjunctio...
详细信息
A new efficient modulation code for holographic memory. or 9 : 12 pseudo-balanced code(9-12PBC), has been developed and evaluated. The proposed code is partitioned into 16 codeword subsets and is decoded in conjunction with Viterbi algorithm. The results of numerical simulations and actual recording experiments show that 9-12PBC gives favorable trade-off between code rate and bit error rate(BER) performance.
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