Along with the flourishing of brain-computer interface technology,the brain-to-brain information transmission between different organisms has received high attention in recent years.However,specific information transm...Along with the flourishing of brain-computer interface technology,the brain-to-brain information transmission between different organisms has received high attention in recent years.However,specific information transmission mode and implementation technology need to be further studied.In this paper,we constructed a brain-to-brain information transmission system between pigeons based on the neural information decoding and electrical stimulation encoding technologies.Our system consists of three parts:(1)the“perception pigeon”learns to distinguish different visual stimuli with two discrepant frequencies,(2)the computer decodes the stimuli based on the neural signals recorded from the“perception pigeon”through a frequency identification algorithm(neural information decoding)and encodes them into different kinds of electrical pulses,(3)the“action pigeon”receives the Intracortical Microstimulation(ICMS)and executes corresponding key-pecking actions through discriminative learning(electrical stimulation encoding).The experimental results show that our brain-to-brain system achieves information transmission from perception to action between two pigeons with the average accuracy of about 72%.Our study verifies the feasibility of information transmission between inter-brain based on neural information decoding and ICMS encoding,providing important technical methods and experimental program references for the development of brain-to-brain communication technology.展开更多
Today the error correcting codes are present in all the telecom standards, in particular the low density parity check (LDPC) codes. The choice of a good code for a given network is essentially linked to the decoding p...Today the error correcting codes are present in all the telecom standards, in particular the low density parity check (LDPC) codes. The choice of a good code for a given network is essentially linked to the decoding performance obtained by the bit error rate (BER) curves. This approach requires a significant simulation time proportional to the length of the code, to overcome this problem Exit chart was introduced, as a fast technique to predict the performance of a particular class of codes called Turbo codes. In this paper, we success to apply Exit chart to analyze convergence behavior of iterative threshold decoding of one step majority logic decodable (OSMLD) codes. The iterative decoding process uses a soft-input soft-output threshold decoding algorithm as component decoder. Simulation results for iterative decoding of simple and concatenated codes transmitted over a Gaussian channel have shown that the thresholds obtained are a good indicator of the Bit Error Rate (BER) curves.展开更多
The security of most code-based cryptosystems relies on the hardness of the syndrome decoding(SD) problem.The best solvers of the SD problem are known as information set,decoding(ISD) algorithms.Recently,Weger,et al.(...The security of most code-based cryptosystems relies on the hardness of the syndrome decoding(SD) problem.The best solvers of the SD problem are known as information set,decoding(ISD) algorithms.Recently,Weger,et al.(2020) described Stern’s ISD algorithm,s-blocks algorithm and partial Gaussian elimination algorithms in the Lee metric over an integer residue ring Z_(pm),where p is a prime number and m is a positive integer,and analyzed the time complexity.In this paper,the authors apply a binary ISD algorithm in the Hamming metric proposed by May,et al.(2011)to solve the SD problem over the Galois ring GR(p^(m),k) endowed with the Lee metric and provide a detailed complexity analysis.Compared with Stern’s algorithm over Zpmin the Lee metric,the proposed algorithm has a significant improvement in the time complexity.展开更多
Soft decode-and-forward(DF) can combine the advantages of both amplify-and-forward and hard DF in relay channels. In this paper, we propose a low-complexity soft DF scheme based on polar codes, which features two key ...Soft decode-and-forward(DF) can combine the advantages of both amplify-and-forward and hard DF in relay channels. In this paper, we propose a low-complexity soft DF scheme based on polar codes, which features two key techniques: a low-complexity cyclic redundancy check(CRC) aided list successive cancellation(CALSC) decoder and a soft information calculation method. At the relay node, a low-complexity CALSC decoder is designed to reduce the computational complexity by adjusting the list size according to the reliabilities of decoded bits. Based on the path probability metric of the CALSC decoder, we propose a method to compute the soft information of the decoded bits in CALSC. Simulation results show that our proposed scheme outperforms the soft DF based on low-density parity-check codes and the soft DF with belief propagation or soft cancellation decoder, especially in the case when the source-relay channel is at the high signal-to-ratio region.展开更多
Genome assembly is a fundamental step in decoding the genetic information of life.Its significance lies in constructing a complete DNA sequence map of organisms,providing the foundation for elucidating the mechanisms ...Genome assembly is a fundamental step in decoding the genetic information of life.Its significance lies in constructing a complete DNA sequence map of organisms,providing the foundation for elucidating the mechanisms of species evolution,exploring gene functions,and identifying disease-related variations.However,some of the repetitive DNA sequences remain“dark materials”in the genome as they are difficult to reveal by the second-generation sequencing approaches.In recent years,breakthroughs in third-generation sequencing technologies have significantly improved the accuracy and continuity of genome assemblies,therefore,being able to resolve the“last piece of the puzzle”in the genome.展开更多
Brain science is a well-recognized frontier science with extensive and profound contents. According to the spatial scales of the contents involved,multiple sub-disciplines have been setup,such as cellular neurobiology...Brain science is a well-recognized frontier science with extensive and profound contents. According to the spatial scales of the contents involved,multiple sub-disciplines have been setup,such as cellular neurobiology,molecular neurobiology,and there are also some sub-disciplines defined according to the main tools adopted,such as computational neuroscience,electroencephalography. This paper points out that the brain research driven by information science is forming a new discipline"brainformatics"a very vigor and vitality one,with"brain information acquisition","brain information decoding"and"brain information applications"as the main contents.This paper explains the concept,scope and challenge of brainformatics with some concrete examples.展开更多
When implementing helicopter-satellite communications, periodical interruption of the received signal is a challenging problem because the communication antenna is intermittently blocked by the rotating blades of the ...When implementing helicopter-satellite communications, periodical interruption of the received signal is a challenging problem because the communication antenna is intermittently blocked by the rotating blades of the helicopter. The helicopter-satellite channel model and the Forward Error Control（FEC） coding countermeasure are presented in this paper. On the basis of this model, Check-Hybrid（CH） Low-Density Parity-Check（LDPC）codes are designed to mitigate the periodical blockage over the helicopter-satellite channels. The CH-LDPC code is derived by replacing part of single parity-check code constraints in a Quasi-Cyclic LDPC（QC-LDPC） code by using more powerful linear block code constraints. In particular, a method of optimizing the CH-LDPC code ensemble by searching the best matching component code among a variety of linear block codes using extrinsic information transfer charts is proposed. Simulation results show that, the CH-LDPC coding scheme designed for the helicopter-satellite channels in this paper achieves more than 25% bandwidth efficiency improvement, compared with the FEC scheme that uses QC-LDPC codes.展开更多
基金supported by the National Natural Science Foundation of China(62301496)the Postdoctoral Fellowship Program of China Postdoctoral Science Foundation(GZC20232447)+1 种基金the Program for Science and Technology of Henan Province of China(242300421411)the Key Scientific and Technological Projects of Henan Province(232102210072,232102210098).
文摘Along with the flourishing of brain-computer interface technology,the brain-to-brain information transmission between different organisms has received high attention in recent years.However,specific information transmission mode and implementation technology need to be further studied.In this paper,we constructed a brain-to-brain information transmission system between pigeons based on the neural information decoding and electrical stimulation encoding technologies.Our system consists of three parts:(1)the“perception pigeon”learns to distinguish different visual stimuli with two discrepant frequencies,(2)the computer decodes the stimuli based on the neural signals recorded from the“perception pigeon”through a frequency identification algorithm(neural information decoding)and encodes them into different kinds of electrical pulses,(3)the“action pigeon”receives the Intracortical Microstimulation(ICMS)and executes corresponding key-pecking actions through discriminative learning(electrical stimulation encoding).The experimental results show that our brain-to-brain system achieves information transmission from perception to action between two pigeons with the average accuracy of about 72%.Our study verifies the feasibility of information transmission between inter-brain based on neural information decoding and ICMS encoding,providing important technical methods and experimental program references for the development of brain-to-brain communication technology.
文摘Today the error correcting codes are present in all the telecom standards, in particular the low density parity check (LDPC) codes. The choice of a good code for a given network is essentially linked to the decoding performance obtained by the bit error rate (BER) curves. This approach requires a significant simulation time proportional to the length of the code, to overcome this problem Exit chart was introduced, as a fast technique to predict the performance of a particular class of codes called Turbo codes. In this paper, we success to apply Exit chart to analyze convergence behavior of iterative threshold decoding of one step majority logic decodable (OSMLD) codes. The iterative decoding process uses a soft-input soft-output threshold decoding algorithm as component decoder. Simulation results for iterative decoding of simple and concatenated codes transmitted over a Gaussian channel have shown that the thresholds obtained are a good indicator of the Bit Error Rate (BER) curves.
基金supported by the National Natural Science Foundation of China under Grant No. 61872355the National Key Research and Development Program of China under Grant No. 2018YFA0704703
文摘The security of most code-based cryptosystems relies on the hardness of the syndrome decoding(SD) problem.The best solvers of the SD problem are known as information set,decoding(ISD) algorithms.Recently,Weger,et al.(2020) described Stern’s ISD algorithm,s-blocks algorithm and partial Gaussian elimination algorithms in the Lee metric over an integer residue ring Z_(pm),where p is a prime number and m is a positive integer,and analyzed the time complexity.In this paper,the authors apply a binary ISD algorithm in the Hamming metric proposed by May,et al.(2011)to solve the SD problem over the Galois ring GR(p^(m),k) endowed with the Lee metric and provide a detailed complexity analysis.Compared with Stern’s algorithm over Zpmin the Lee metric,the proposed algorithm has a significant improvement in the time complexity.
基金supported by the National Natural Science Foundation of China(No.61171099,No.61671080),Nokia Beijing Bell lab
文摘Soft decode-and-forward(DF) can combine the advantages of both amplify-and-forward and hard DF in relay channels. In this paper, we propose a low-complexity soft DF scheme based on polar codes, which features two key techniques: a low-complexity cyclic redundancy check(CRC) aided list successive cancellation(CALSC) decoder and a soft information calculation method. At the relay node, a low-complexity CALSC decoder is designed to reduce the computational complexity by adjusting the list size according to the reliabilities of decoded bits. Based on the path probability metric of the CALSC decoder, we propose a method to compute the soft information of the decoded bits in CALSC. Simulation results show that our proposed scheme outperforms the soft DF based on low-density parity-check codes and the soft DF with belief propagation or soft cancellation decoder, especially in the case when the source-relay channel is at the high signal-to-ratio region.
基金supported by the National Natural Science Foundation of China(32090034)Zhejiang Provincial Natural Science Foundation of China(2022XHSJJ001)+3 种基金Hangzhou City Leading Innovation and Entrepreneurship Team(TD2020004)“Pioneer”and“Leading Goose”Research and Development Program of Zhejiang(2024SSYS0033)Westlake Education FoundationWestlake Laboratory of Life Sciences and Biomedicine.
文摘Genome assembly is a fundamental step in decoding the genetic information of life.Its significance lies in constructing a complete DNA sequence map of organisms,providing the foundation for elucidating the mechanisms of species evolution,exploring gene functions,and identifying disease-related variations.However,some of the repetitive DNA sequences remain“dark materials”in the genome as they are difficult to reveal by the second-generation sequencing approaches.In recent years,breakthroughs in third-generation sequencing technologies have significantly improved the accuracy and continuity of genome assemblies,therefore,being able to resolve the“last piece of the puzzle”in the genome.
基金National Natural Science Foundation of Chinagrant number:91232725
文摘Brain science is a well-recognized frontier science with extensive and profound contents. According to the spatial scales of the contents involved,multiple sub-disciplines have been setup,such as cellular neurobiology,molecular neurobiology,and there are also some sub-disciplines defined according to the main tools adopted,such as computational neuroscience,electroencephalography. This paper points out that the brain research driven by information science is forming a new discipline"brainformatics"a very vigor and vitality one,with"brain information acquisition","brain information decoding"and"brain information applications"as the main contents.This paper explains the concept,scope and challenge of brainformatics with some concrete examples.
基金supported by the National Natural Science Foundation of China(No.91538203)the new strategic industries development projects of Shenzhen City(No.JCYJ20150403155812833)
文摘When implementing helicopter-satellite communications, periodical interruption of the received signal is a challenging problem because the communication antenna is intermittently blocked by the rotating blades of the helicopter. The helicopter-satellite channel model and the Forward Error Control（FEC） coding countermeasure are presented in this paper. On the basis of this model, Check-Hybrid（CH） Low-Density Parity-Check（LDPC）codes are designed to mitigate the periodical blockage over the helicopter-satellite channels. The CH-LDPC code is derived by replacing part of single parity-check code constraints in a Quasi-Cyclic LDPC（QC-LDPC） code by using more powerful linear block code constraints. In particular, a method of optimizing the CH-LDPC code ensemble by searching the best matching component code among a variety of linear block codes using extrinsic information transfer charts is proposed. Simulation results show that, the CH-LDPC coding scheme designed for the helicopter-satellite channels in this paper achieves more than 25% bandwidth efficiency improvement, compared with the FEC scheme that uses QC-LDPC codes.
