为降低信道均衡算法的复杂度，提出了一种适于LDPC（Low—Density Parity—Check）编码MIMO（Multi—Input Multi，Output）信道的基于迭代式概率数据辅助（PDA：Probabilistie Data Association）的次优软输出判决反馈均衡算法。滑动窗...为降低信道均衡算法的复杂度，提出了一种适于LDPC（Low—Density Parity—Check）编码MIMO（Multi—Input Multi，Output）信道的基于迭代式概率数据辅助（PDA：Probabilistie Data Association）的次优软输出判决反馈均衡算法。滑动窗PDA检测器输出外信息作为软输入软输出LDPC信道解码器的先验信息，实现信道均衡与信道解码的联合信息更新，克服传统判决反馈均衡器误差传播的缺陷。仿真表明，泼均衡算法性能要比V—BLAST迫零检测算法提高1—2dB，当Eb／No为3dB时，误比特率达到10^-5且算法复杂度仪为O（N^3），可获得较为满意的码间干扰消除效果。展开更多
为用国产手段提高日盲区紫外激光机非视线方式(non-line of sight,NLOS)传输信号的高速通信性能,研制了紫外声光调制器对紫外光进行调制;并联使用已国产化紫外光电倍增管接收信号;设计了一种新的调制方式—改进的差分脉冲位置调制(IDPPM...为用国产手段提高日盲区紫外激光机非视线方式(non-line of sight,NLOS)传输信号的高速通信性能,研制了紫外声光调制器对紫外光进行调制;并联使用已国产化紫外光电倍增管接收信号;设计了一种新的调制方式—改进的差分脉冲位置调制(IDPPM)为核心的软判决解码技术,并将软判决与硬判决作了比较,同时将软判决时对时隙错误概率的改善做了仿真,验证其对通信改善的真实性.用紫外光进行高速通信,关键在于能够对信号进行高比特率的编码、调制与解调,这是紫外通信区别于其他通信方式的重要特征.展开更多
Pattern时延差(PDS:Pattern time Delay Shift)编码通信体制具有很好的抗多途干扰能力,但传输过程中仍存在一定的误码。为提高该体制的抗噪声能力,将网格编码调制(TCM:Trellis-Coded Modulation)技术与PDS体制结合使用,对信息进行网格...Pattern时延差(PDS:Pattern time Delay Shift)编码通信体制具有很好的抗多途干扰能力,但传输过程中仍存在一定的误码。为提高该体制的抗噪声能力,将网格编码调制(TCM:Trellis-Coded Modulation)技术与PDS体制结合使用,对信息进行网格编码调制和维特比软判决译码。实验结果证明,该方案抗噪声效果显著,可使PDS体制的抗噪声性能提高3 dB左右。展开更多
This paper concerns a decoding strategy to improve the throughput in NAND flash memory using lowdensity parity-check(LDPC) codes. As the reliability of NAND flash memory continues degrading, conventional error correct...This paper concerns a decoding strategy to improve the throughput in NAND flash memory using lowdensity parity-check(LDPC) codes. As the reliability of NAND flash memory continues degrading, conventional error correction codes have become increasingly inadequate.LDPC code is highly desirable, due to its powerful correction strength. However, in order to maximize the correction strength, LDPC codes demand fine-grained memory sensing,leading to a significant read latency penalty. To address the drawbacks caused by soft-decision LDPC decoding, this paper proposes a hybrid hard-/soft-decision LDPC decoding strategy. Simulation results show that the proposed approach could reduce the read latency penalty and hence improve the decoding throughput up to 30 %, especially in early lifetime of NAND flash memory, compared with the conventional decoding with equivalent area.展开更多
文摘为降低信道均衡算法的复杂度，提出了一种适于LDPC（Low—Density Parity—Check）编码MIMO（Multi—Input Multi，Output）信道的基于迭代式概率数据辅助（PDA：Probabilistie Data Association）的次优软输出判决反馈均衡算法。滑动窗PDA检测器输出外信息作为软输入软输出LDPC信道解码器的先验信息，实现信道均衡与信道解码的联合信息更新，克服传统判决反馈均衡器误差传播的缺陷。仿真表明，泼均衡算法性能要比V—BLAST迫零检测算法提高1—2dB，当Eb／No为3dB时，误比特率达到10^-5且算法复杂度仪为O（N^3），可获得较为满意的码间干扰消除效果。
文摘为用国产手段提高日盲区紫外激光机非视线方式(non-line of sight,NLOS)传输信号的高速通信性能,研制了紫外声光调制器对紫外光进行调制;并联使用已国产化紫外光电倍增管接收信号;设计了一种新的调制方式—改进的差分脉冲位置调制(IDPPM)为核心的软判决解码技术,并将软判决与硬判决作了比较,同时将软判决时对时隙错误概率的改善做了仿真,验证其对通信改善的真实性.用紫外光进行高速通信,关键在于能够对信号进行高比特率的编码、调制与解调,这是紫外通信区别于其他通信方式的重要特征.
基金supported partly by the National Natural Science Foundation of China(61274028)the National High-tech R&D Program of China(2011AA010405)
文摘This paper concerns a decoding strategy to improve the throughput in NAND flash memory using lowdensity parity-check(LDPC) codes. As the reliability of NAND flash memory continues degrading, conventional error correction codes have become increasingly inadequate.LDPC code is highly desirable, due to its powerful correction strength. However, in order to maximize the correction strength, LDPC codes demand fine-grained memory sensing,leading to a significant read latency penalty. To address the drawbacks caused by soft-decision LDPC decoding, this paper proposes a hybrid hard-/soft-decision LDPC decoding strategy. Simulation results show that the proposed approach could reduce the read latency penalty and hence improve the decoding throughput up to 30 %, especially in early lifetime of NAND flash memory, compared with the conventional decoding with equivalent area.
