将极化码与SCMA多址系统相结合,并针对传统的独立检测译码方案(independent detection and decoding,IDD)因缺乏对译码输出信息的再利用而导致系统性能不佳的问题,提出了SCMA以及极化码联合检测译码方案(joint detection and decoding,J...将极化码与SCMA多址系统相结合,并针对传统的独立检测译码方案(independent detection and decoding,IDD)因缺乏对译码输出信息的再利用而导致系统性能不佳的问题,提出了SCMA以及极化码联合检测译码方案(joint detection and decoding,JDD)。该方案在接收端借助译码获得的内信息辅助更新SCMA多用户检测器的初始先验信息,在检测器与译码器之间实现软信息的回溯迭代,从而得到更显著的系统性能增益。仿真结果表明采用了JDD方案的系统性能相比IDD方案得到了显著的提升,误码率相较IDD方案提升了大约2 d B。展开更多
针对BCH-LDPC级联编码的MIMO系统,提出一种外码译码反馈联合迭代检测译码算法。该算法在迭代检测译码结构的基础上,引入外码硬判决译码反馈。MIMO检测器利用反馈的硬判决信息,经过映射处理后用于更新检测器的检测列表,以减小迭代检测译...针对BCH-LDPC级联编码的MIMO系统,提出一种外码译码反馈联合迭代检测译码算法。该算法在迭代检测译码结构的基础上,引入外码硬判决译码反馈。MIMO检测器利用反馈的硬判决信息,经过映射处理后用于更新检测器的检测列表,以减小迭代检测译码算法的运算量。同时,利用外码译码结果直接计算部分LDPC码译码初始信息,提高软信息的可靠性,从而提高系统性能。仿真结果表明,与迭代检测译码算法相比,所提算法能够使处理一帧数据时的平均检测次数减少57.1%,从而降低算法运算量。同时由于外码译码反馈的引入,所提算法至少能够获得0.2 d B性能增益。展开更多
An improved list sphere decoder （ILSD） is proposed based on the conventional list sphere decoder （LSD） and the reduced- complexity maximum likelihood sphere-decoding algorithm. Unlike the conventional LSD with fix...An improved list sphere decoder （ILSD） is proposed based on the conventional list sphere decoder （LSD） and the reduced- complexity maximum likelihood sphere-decoding algorithm. Unlike the conventional LSD with fixed initial radius, the ILSD adopts an adaptive radius to accelerate the list cdnstruction. Characterized by low-complexity and radius-insensitivity, the proposed algorithm makes iterative joint detection and decoding more realizable in multiple-antenna systems. Simulation results show that computational savings of ILSD over LSD are more apparent with more transmit antennas or larger constellations, and with no performance degradation. Because the complexity of the ILSD algorithm almost keeps invariant with the increasing of initial radius, the BER performance can be improved by selecting a sufficiently large radius.展开更多
文摘将极化码与SCMA多址系统相结合,并针对传统的独立检测译码方案(independent detection and decoding,IDD)因缺乏对译码输出信息的再利用而导致系统性能不佳的问题,提出了SCMA以及极化码联合检测译码方案(joint detection and decoding,JDD)。该方案在接收端借助译码获得的内信息辅助更新SCMA多用户检测器的初始先验信息,在检测器与译码器之间实现软信息的回溯迭代,从而得到更显著的系统性能增益。仿真结果表明采用了JDD方案的系统性能相比IDD方案得到了显著的提升,误码率相较IDD方案提升了大约2 d B。
文摘针对BCH-LDPC级联编码的MIMO系统,提出一种外码译码反馈联合迭代检测译码算法。该算法在迭代检测译码结构的基础上,引入外码硬判决译码反馈。MIMO检测器利用反馈的硬判决信息,经过映射处理后用于更新检测器的检测列表,以减小迭代检测译码算法的运算量。同时,利用外码译码结果直接计算部分LDPC码译码初始信息,提高软信息的可靠性,从而提高系统性能。仿真结果表明,与迭代检测译码算法相比,所提算法能够使处理一帧数据时的平均检测次数减少57.1%,从而降低算法运算量。同时由于外码译码反馈的引入,所提算法至少能够获得0.2 d B性能增益。
基金The National Natural Science Founda-tion of China ( No 60496316)the National Hi-Tech Re-search and Development Program (863) of China (No2006-AA01Z270)
文摘An improved list sphere decoder （ILSD） is proposed based on the conventional list sphere decoder （LSD） and the reduced- complexity maximum likelihood sphere-decoding algorithm. Unlike the conventional LSD with fixed initial radius, the ILSD adopts an adaptive radius to accelerate the list cdnstruction. Characterized by low-complexity and radius-insensitivity, the proposed algorithm makes iterative joint detection and decoding more realizable in multiple-antenna systems. Simulation results show that computational savings of ILSD over LSD are more apparent with more transmit antennas or larger constellations, and with no performance degradation. Because the complexity of the ILSD algorithm almost keeps invariant with the increasing of initial radius, the BER performance can be improved by selecting a sufficiently large radius.
