The Experts below are selected from a list of 16647 Experts worldwide ranked by ideXlab platform

Shuming Chen - One of the best experts on this subject based on the ideXlab platform.

  • exploiting thread level parallelism of irregular ldpc decoder with simultaneous multi threading technique
    APPT'07 Proceedings of the 7th international conference on Advanced parallel processing technologies, 2007
    Co-Authors: Xing Fang, Dong Wang, Shuming Chen
    Abstract:

    Irregular LDPC (Low Density Parity Check) code is a powerful error correction code in wireless communication applications. However, irregular LDPC decoder has limited instruction-level parallelism. This paper exploits the thread-level parallelism of irregular LDPC decoders with simultaneous multithreading (SMT) techniques. The simulations with random constructed parity check matrixes under different signal-to-noise ratios and three block lengths show that it can attain 16.7%-45.3% performance improvement by SMT technique with the area cost increasing by about 17.73%, which supposes that SMT is an efficient technique to improve the performance of irregular LDPC decoders.

  • APPT - Exploiting thread-level parallelism of irregular LDPC decoder with simultaneous multi-threading technique
    Lecture Notes in Computer Science, 2007
    Co-Authors: Xing Fang, Dong Wang, Shuming Chen
    Abstract:

    Irregular LDPC (Low Density Parity Check) code is a powerful error correction code in wireless communication applications. However, irregular LDPC decoder has limited instruction-level parallelism. This paper exploits the thread-level parallelism of irregular LDPC decoders with simultaneous multithreading (SMT) techniques. The simulations with random constructed parity check matrixes under different signal-to-noise ratios and three block lengths show that it can attain 16.7%-45.3% performance improvement by SMT technique with the area cost increasing by about 17.73%, which supposes that SMT is an efficient technique to improve the performance of irregular LDPC decoders.

Yasunao Katayama - One of the best experts on this subject based on the ideXlab platform.

  • 60 ghz single carrier coherent detection system with robust 16 qam signal recovery
    Wireless Communications and Networking Conference, 2014
    Co-Authors: Daiju Nakano, Yasuteru Kohda, Kohji Takano, Nobuyuki Ohba, Toshiyuki Yamane, Yasunao Katayama
    Abstract:

    This paper describes a millimeter wave wireless system using the 60-GHz frequency band, focusing on the data recovery algorithm and implementation to compensate for both the phase noise and the DC offset. Our robust baseband system supports data transfers at 7.04 Gbps using 16-QAM single-carrier with effective digital compensation, an improved adaptive equalizer, and a post-phase rotator and post-shifter. We use a low-overhead frame format without training symbols in the payload and RS(255, 239) as the error correction code so that we can retain spectral efficiency with an effective data rate around 6.6 Gbps with a bit error rate of 4.0E-5 at 3 m distance. Our results show how millimeter wave technology can provide higher data rates and higher aggregated channel capacities for future dense networks.

  • WCNC - 60-GHz single-carrier coherent detection system with robust 16-QAM signal recovery
    2014 IEEE Wireless Communications and Networking Conference (WCNC), 2014
    Co-Authors: Daiju Nakano, Yasuteru Kohda, Kohji Takano, Nobuyuki Ohba, Toshiyuki Yamane, Yasunao Katayama
    Abstract:

    This paper describes a millimeter wave wireless system using the 60-GHz frequency band, focusing on the data recovery algorithm and implementation to compensate for both the phase noise and the DC offset. Our robust baseband system supports data transfers at 7.04 Gbps using 16-QAM single-carrier with effective digital compensation, an improved adaptive equalizer, and a post-phase rotator and post-shifter. We use a low-overhead frame format without training symbols in the payload and RS(255, 239) as the error correction code so that we can retain spectral efficiency with an effective data rate around 6.6 Gbps with a bit error rate of 4.0E-5 at 3 m distance. Our results show how millimeter wave technology can provide higher data rates and higher aggregated channel capacities for future dense networks.

Xing Fang - One of the best experts on this subject based on the ideXlab platform.

  • exploiting thread level parallelism of irregular ldpc decoder with simultaneous multi threading technique
    APPT'07 Proceedings of the 7th international conference on Advanced parallel processing technologies, 2007
    Co-Authors: Xing Fang, Dong Wang, Shuming Chen
    Abstract:

    Irregular LDPC (Low Density Parity Check) code is a powerful error correction code in wireless communication applications. However, irregular LDPC decoder has limited instruction-level parallelism. This paper exploits the thread-level parallelism of irregular LDPC decoders with simultaneous multithreading (SMT) techniques. The simulations with random constructed parity check matrixes under different signal-to-noise ratios and three block lengths show that it can attain 16.7%-45.3% performance improvement by SMT technique with the area cost increasing by about 17.73%, which supposes that SMT is an efficient technique to improve the performance of irregular LDPC decoders.

  • APPT - Exploiting thread-level parallelism of irregular LDPC decoder with simultaneous multi-threading technique
    Lecture Notes in Computer Science, 2007
    Co-Authors: Xing Fang, Dong Wang, Shuming Chen
    Abstract:

    Irregular LDPC (Low Density Parity Check) code is a powerful error correction code in wireless communication applications. However, irregular LDPC decoder has limited instruction-level parallelism. This paper exploits the thread-level parallelism of irregular LDPC decoders with simultaneous multithreading (SMT) techniques. The simulations with random constructed parity check matrixes under different signal-to-noise ratios and three block lengths show that it can attain 16.7%-45.3% performance improvement by SMT technique with the area cost increasing by about 17.73%, which supposes that SMT is an efficient technique to improve the performance of irregular LDPC decoders.

Daiju Nakano - One of the best experts on this subject based on the ideXlab platform.

  • 60 ghz single carrier coherent detection system with robust 16 qam signal recovery
    Wireless Communications and Networking Conference, 2014
    Co-Authors: Daiju Nakano, Yasuteru Kohda, Kohji Takano, Nobuyuki Ohba, Toshiyuki Yamane, Yasunao Katayama
    Abstract:

    This paper describes a millimeter wave wireless system using the 60-GHz frequency band, focusing on the data recovery algorithm and implementation to compensate for both the phase noise and the DC offset. Our robust baseband system supports data transfers at 7.04 Gbps using 16-QAM single-carrier with effective digital compensation, an improved adaptive equalizer, and a post-phase rotator and post-shifter. We use a low-overhead frame format without training symbols in the payload and RS(255, 239) as the error correction code so that we can retain spectral efficiency with an effective data rate around 6.6 Gbps with a bit error rate of 4.0E-5 at 3 m distance. Our results show how millimeter wave technology can provide higher data rates and higher aggregated channel capacities for future dense networks.

  • WCNC - 60-GHz single-carrier coherent detection system with robust 16-QAM signal recovery
    2014 IEEE Wireless Communications and Networking Conference (WCNC), 2014
    Co-Authors: Daiju Nakano, Yasuteru Kohda, Kohji Takano, Nobuyuki Ohba, Toshiyuki Yamane, Yasunao Katayama
    Abstract:

    This paper describes a millimeter wave wireless system using the 60-GHz frequency band, focusing on the data recovery algorithm and implementation to compensate for both the phase noise and the DC offset. Our robust baseband system supports data transfers at 7.04 Gbps using 16-QAM single-carrier with effective digital compensation, an improved adaptive equalizer, and a post-phase rotator and post-shifter. We use a low-overhead frame format without training symbols in the payload and RS(255, 239) as the error correction code so that we can retain spectral efficiency with an effective data rate around 6.6 Gbps with a bit error rate of 4.0E-5 at 3 m distance. Our results show how millimeter wave technology can provide higher data rates and higher aggregated channel capacities for future dense networks.

Yaakov S. Weinstein - One of the best experts on this subject based on the ideXlab platform.

  • syndrome measurement order for the 7 1 3 quantum error correction code
    arXiv: Quantum Physics, 2013
    Co-Authors: Yaakov S. Weinstein
    Abstract:

    In this work we explore the accuracy of quantum error correction depending of the order of the implemented syndrome measurements. CSS codes require bit-flip and phase flip-syndromes be measured separately. To comply with fault tolerant demands and to maximize accuracy this set of syndrome measurements should be repeated allowing for flexibility in the order of their implementation. We examine different possible orders of Shor state and Steane state syndrome measurements for the [[7,1,3]] quantum error correction code. We find that the best choice of syndrome order, determined by the fidelity of the state after noisy error correction, will depend on the error environment. We also compare the fidelity when syndrome measurements are done with Shor states versus Steane states and find that Steane states generally, but not always, lead to final states with higher fidelity. Together, these results allow a quantum computer programmer to choose the optimal syndrome measurement scheme based on the system's error environment.

  • Encoding an arbitrary state in a [7,1,3] quantum error correction code
    Quantum Information Processing, 2013
    Co-Authors: Sidney D. Buchbinder, Channing L. Huang, Yaakov S. Weinstein
    Abstract:

    We calculate the fidelity with which an arbitrary state can be encoded into a [7, 1, 3] Calderbank-Shor-Steane quantum error correction code in a non-equiprobable Pauli operator error environment with the goal of determining whether this encoding can be used for practical implementations of quantum computation. The determination of usability is accomplished by applying ideal error correction to the encoded state which demonstrates the correctability of errors that occurred during the encoding process. We also apply single-qubit Clifford gates to the encoded state and determine the accuracy with which these gates can be implemented. Finally, fault tolerant noisy error correction is applied to the encoded states allowing us to compare noisy (realistic) and perfect error correction implementations. We find the encoding to be usable for the states $${|0\rangle, |1\rangle}$$ , and $${|\pm\rangle = |0\rangle\pm|1\rangle}$$ . These results have implications for when non-fault tolerant procedures may be used in practical quantum computation and whether quantum error correction must be applied at every step in a quantum protocol.

  • encoding an arbitrary state in a 7 1 3 quantum error correction code
    arXiv: Quantum Physics, 2011
    Co-Authors: Sidney D. Buchbinder, Channing L. Huang, Yaakov S. Weinstein
    Abstract:

    We calculate the fidelity with which an arbitrary state can be encoded into a [7,1,3] CSS quantum error correction code in a non-equiprobable Pauli operator error environment with the goal of determining whether this encoding can be used for practical implementations of quantum computation. This determination is accomplished by applying ideal error correction to the encoded state which demonstrates the correctability of errors that occurred during the encoding process. We then apply single-qubit Clifford gates to the encoded state and determine the accuracy with which these gates can be applied. Finally, fault tolerant noisy error correction is applied to the encoded states in the non-equiprobable Pauli operator error environment allowing us to compare noisy (realistic) and perfect error correction implementations. We note that this maintains the fidelity of the encoded state for certain error-probability values. These results have implications for when non-fault tolerant procedures may be used in practical quantum computation and whether quantum error correction should be applied at every step in a quantum protocol.

  • logical zeros for the seven qubit quantum error correction code
    Proceedings of SPIE, 2011
    Co-Authors: Gerald Gilbert, Yaakov S. Weinstein
    Abstract:

    ABSTRACT Inthisworkwecomparetheaccuracyoftwomethodsusedtocon structa logicalzerostate appropriateforthe [7;1;3] CSSquantum error correction code in a non-equiprobablePauli o perator error environment. The r st method is to apply errorcorrection, via syndrome measurement, on seven physical qu bits all in the state zero. To do the syndrome measurementsin a fault-tolerant fashion requires the construction of fo ur qubit Shor states. These Shor states are also assumed to beconstructedin anon-equiprobablePaulioperatorerrorenv ironmentandit is these thatareusedtoimplementthe syndro memeasurement. The second construction method is to implemen t the [7;1;3] encoding gate sequence, also in the non-equiprobable Pauli operator error environment. The d elit y of the output states is calculated for each of these methods .With respect to the Shor state construction we n d that the im plementation of (noisy) parity based veric ations does notnecessarily raise the d elity of the resulting Shor state. W e also n d that the second logical zero construction methodoutputs a seven qubit state with a respectfully higher d eli ty than the r st (fault tolerant) method. However, the d eli ty ofthe single qubit of stored informationhas almost equivalen td elity from the two constructionmethods.Keywords: cluster state, entanglement,decoherence,superoperator

  • Entanglement evolution in a five qubit error correction code
    Quantum Information Processing, 2010
    Co-Authors: Yaakov S. Weinstein
    Abstract:

    In this paper I explore the entanglement evolution of qubits that are part of a five qubit quantum error correction code subject to various decohering environments. Specifically, I look for possible parallels between the entanglement degradation and the fidelity of the logical qubit of quantum information stored in the physical qubits. In addition, I note the possible exhibition of entanglement sudden death (ESD) due to decoherence and question whether ESD is actually a roadblock to successful quantum computation.