共查询到19条相似文献,搜索用时 62 毫秒
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连续相位调制的非相干减少状态差分序列检测算法 总被引:1,自引:0,他引:1
该文提出了连续相位调制的一种非相干减少状态的差分序列检测(RSDSD)算法.该算法基于减少状态序列检测(RSSD)的思想,利用简化状态格状图进行一码元差分Viterbi检测.分析了全响应连续相位调制(CPM)信号和部分响应CPM信号简化状态格状图的最小平方欧氏距离.在AWGN信道下以八进制h=1/8的2RC信号为例给出RSSD和RSDSD算法的性能.对不同的简化方案以及存在多普勒频移时相干RSSD和非相干RSDSD的性能进行了比较.仿真结果表明:所提出的算法比相干最大似然序列检测在10-3误比特率时信噪比损失约为2dB,但它对于载波恢复困难的情形更为合适和稳健. 相似文献
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基于连续相位调制(CPM)的物理层网络编码(PNC)由于其高效的吞吐率和频谱利用率特性引起了越来越多的关注。现有关于CPM-PNC检测的研究大多建立在到达中继端的两节点信号载波相位完全同步或相位差已知的基础上。实际应用中,这一载波相位差不可避免,也很难准确估计。针对这一问题,该文提出一种中继端存在未知载波相位差条件下的CPM-PNC非相干多符号检测算法。该算法根据最大似然检测原理,通过观察多个码元来实现中间码元的检测,充分利用了CPM信号的相位记忆特性。仿真结果表明,该文所提出的CPM-PNC非相干多符号检测算法性能优越。而且随着观察窗口长度的增大,其性能显著提高并逐渐趋近最优相干检测性能。在误码率(BER)为10-4 时,相比于非相干单符号检测,观察窗口长度为5个码元时的CPM-PNC非相干多符号检测有6.7 dB的性能增益。 相似文献
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本文提出了平均误经特率最小意义下的最佳线性多用户信号检测器,并给出了救解这种最佳线性多用户信号检测器的近似方法--训练单层感知器法,初步的研究结果表明;这种检测器的性能优于以往多种检测器。 相似文献
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连续相位调制(CPM)本身所具有的高功率和频谱利用率特性使得它在无线通信领域尤其是军事通信领域中应用广泛,但其解调的复杂度也随着部分响应长度和进制数的增加呈指数增长.文章给出了一种CPM的减少状态非相干序列检测算法,通过正交化处理有效地减少了匹配滤波器个数;在序列检测阶段,通过状态融合减少维特比译码的状态数,然后结合判决反馈进行检测. 相似文献
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针对多用户多输入多输出技术上行传输系统,以最大信干噪比作为多址干扰(MAI)抑制的准则提出了一种新算法。该算法充分利用基站接收端所能获知的信道状态信息构造滤波矩阵,以抑制 MAI以及噪声带来的影响。与广泛关注的块对角化 MAI抑制算法相比,该算法考虑了噪声的影响,性能有较大提升。针对非理想信道环境,给出了本文算法的改进,仿真结果表明该算法具有优异的性能。 相似文献
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XuChangqing WangHongyang SongWentao 《电子科学学刊(英文版)》2004,21(6):490-494
As the Projection Approximation Subspace Tracking with deflation(PASTd) algorithm is sensitive to impulsive noise, an improved subspace tracking algorithm is proposed and applied to blind adaptive multi-user detection. Simulation results show that the improved PASTd algorithm not only remains the properties of the conventional PASTd algorithm, but also has good Bit Error Rate(BER) performance in impulsive noise environment, thus it can effectively improve the system performance. 相似文献
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Jenn‐Kaie Lain Shang‐Yi Yang Chih‐Wei Lin 《International Journal of Communication Systems》2013,26(8):964-973
This paper presents a joint carrier frequency offset estimation and multiuser detection based on a maximum likelihood approach in multicarrier code division multiple access systems. With the definition of a score function based on the log‐likelihood, the joint carrier frequency offset estimation and multiuser detection can be formulated as a nonlinear optimization problem over the joint of a multidimensional real space and a multidimensional discrete space. To reduce the computational complexity required by the joint decision statistic, while still obtaining a desirable performance, a new method using cross‐entropy optimization is proposed to solve the nonlinear optimization problem. Because of the robustness of the cross‐entropy optimization, the joint decision statistic can be efficiently solved, and, as shown by the furnished simulation results, the proposed approach can achieve satisfactory performance in various scenarios. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
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ZhouLerong GuoJinghong WeiGang 《电子科学学刊(英文版)》2004,21(4):332-336
This letter derives the Equivalent M-band Discrete Wavelet(EMDW) transmission mode of Orthogonal Frequency Division Multiplexing(OFDM) transmission systems, and presents a new Quadrature M-band Discrete Wavelet(QMDW) based OFDM-CDMA(Code Division Multiple Access) communication systems for high speed Power Line Communication (PLC) channels,This system gives much better robustness to Inter-Channel Interference (ICI), Multi-User Interference (MUI) and noise interference, which is verified by simulation. 相似文献
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Li Lei Niu Zhisheng 《电子科学学刊(英文版)》2007,24(2):257-260
A spatial compatible user grouping algorithm is proposed to reduce CoChannel Interference (CCI) in Space Division Multiple Access (SDMA) multiuser Multiple Input Multiple Output (MIMO) systems. We evaluate the interferences among Users by use of distances between row spaces spanned by users' channel matrixes, then control frequency sharing according to the compatible user grouping algorithm. Results show that the row space distance algorithm outperforms others because it can fully utilize the information from users' channel matrixes, especially the matrix structure information. The results also prove that the algorithm based on channel matrix structure analysis is a better candidate for spatial compatibility approximation. 相似文献