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国家自然科学基金(U1035001)

作品数:19 被引量:48H指数:4
相关作者:彭涛王文博刘子扬袁龙钱荣荣更多>>
相关机构:北京邮电大学国家知识产权局更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划国家科技重大专项更多>>
相关领域:电子电信自动化与计算机技术理学天文地球更多>>

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19 条 记 录,以下是 1-10
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Probabilistic greedy pursuit for streaming compressed spectrum sensing被引量:1
2011年
This paper presents a probabilistic greedy pursuit (PGP) algorithm for compressed wide-band spectrum sensing under cognitive radio (CR) scenario. PGP relies on streaming compressed sensing (CS) framework, which differs from traditional CS processing way that only focuses on fixed-length signal's compressive sampling and reconstruction. It utilizes analog-to-information converter (AIC) to perform sub-Nyquist rate signal acquisition at the radio front-end (RF) of CR, the measurement process of which is carefully designed for streaming framework. Since the sparsity of wide-band spectrum is unavailable in practical situation, PGP introduces the probabilistic scheme by dynamically updating support confidence coefficient and utilizes greedy pursuit to perform streaming spectrum estimation, which gains sensing performance promotion progressively. The proposed algorithm enables robust spectrum estimation without the priori sparsity knowledge, and keeps low computational complexity simultaneously, which is more suitable for practical on-line applications. Various simulations and comparisons validate the effectiveness of our approach.
LU YangGUO Wen-binWANG XingWANG Wen-bo
Quality of service aware admission control in cognitive device-to-device network
2011年
A hybrid system of cellular mode and device-to-device (D2D) mode is considered in this paper, where the cellular resource is reused by the D2D transmission. With the objective of capacity maximization, the power optimization of D2D sub-system is considered, taking into account quality of service (QoS) requirement. The power optimization problem is divided into two stages: The first stage is the admission control scheme design based on the QoS requirement of D2D users, and the second is power allocation to maximize aggregate throughput of admissible D2D users. For the D2D admission control problem, a heuristic sorting-based algorithm is proposed to index the admissible D2D links, where gain to Interference ratio (GIR) sorting criterion is used. Applying an approximate form of Shannon capacity, the power allocation problem can be solved by convex optimization and geometric programming tools efficiently. Based on the theoretical analysis, a practical algorithm is proposed. The precision can reach a trade-off between complexity and performance. Numerical simulation results confirm that combining with GIR sorting method, the proposed scheme can significantly improve the D2D system's capacity and fairness.
FU Zi-xi HU Chun-jing PENG Tao LU Qian-xi WANG Wen-bo
混合蜂窝与端到端系统PDCCH盲解码研究被引量:1
2014年
端到端D2D(Device-to-Device)用户通过盲检测LTE系统中小区用户的物理层下行控制信道PDCCH(Physical Downlink Control Channel)获得小区中用户的资源分配信息,复用频谱资源,可以实现不经过基站的直联通信,提高无线资源利用率。提出一种基于"路径度量优势"进行PDCCH盲检测的实现方式,描述了它的计算方法,并对其性能进行了仿真分析。
杨晨晨彭涛钱荣荣
关键词:LTE端到端
An Efficient Design of FPGA-Based Sample Rate Converting Filter in Software Defined Radio
In order to be compatible with different sample rate requirements in communication systems,Software Defined Ra...
Yuze ZhouChunjing HuTao Peng
Service behavior modeling and service behavior convergence-based radio resource scheduling in wireless systems被引量:1
2011年
With the development of wireless networks, the amount of multiple services increased sharply in recent years. High quality multiple services with low price are urgently needed especially in new generation mobile communication systems, e.g., 3G/LTE networks. It is important to enhance the availability of data service resources. Services have strong association which are used by clients with similar behavior habits in networks. Such feature results in service behavior convergence (SBC) and its utilization will enhance resource efficiency. This paper proposes two applications of service behavior: service prediction and a scheduling algorithm which enhances bandwidth efficiency. Convergence cells are classified according to SBC and hot-spot services are broadcasted separately in each convergence cell. It is demonstrated by stimulation that the bandwidth is saved 80% more than classical cellular system and nearly 20% more than traditional broadcasting system.
CAI Wen-qi ZHANG Xing WANG Wen-bo
宽频信号能量检测最优判决门限被引量:2
2014年
针对宽频带信号能量检测的性能主要受到虚警概率和漏检概率的影响,提出从其判决门限的选取入手,对一定频谱环境下的检测算法性能是否可以达到指标要求做出分析,研究了门限设置对虚警概率和漏检概率的影响.通过数学推导得到了宽频带信号能量检测最小代价门限的闭式解,并给出了其最优判决门限的选取准则,即根据不同的时域观测时长选取不同的判决门限.仿真结果验证了所提出结论的正确性.
刘雯雯袁龙刘子扬彭涛王文博
基于压缩感知的自适应卡尔曼滤波被引量:8
2012年
针对稀疏流信号,提出了一种自适应卡尔曼滤波恢复方法,该算法基于压缩感知AIC结构,用有限长的窗口对信号进行观测,利用前后窗内信号之间的相关性,建立信号的状态转移方程,并与压缩感知获得的观测方程共同构成信号的状态空间模型,进而利用降阶的卡尔曼滤波算法近似得到信号的最小均方误差估计。信号重构阶段通过卡尔曼滤波迭代逐渐得到精确的支撑集,与以往仅用起始阶段的恢复结果获得支撑集的方法相比,本算法对起始阶段恢复支撑集的算法的精确程度要求不高,从而降低了整个算法的复杂度和要求的观测维度。仿真结果显示,这种自适应的卡尔曼滤波算法在宽带流信号的恢复中可以有效地降低所需观测维度,且最终结果可近似地收敛到信号的最小均方误差估计。
郭文彬李航
关键词:压缩感知卡尔曼滤波
干扰系统先验信息未知的宽带能量检测被引量:10
2012年
为了使感知无线电在宽带频谱中对干扰系统先验信息未知的信号进行能量检测时获得更好的检测性能,建立了一个基于采样的宽带频谱模型并且推导出了基于最小错判率准则的判决门限闭式解.仿真结果表明,在宽带信号能量检测中采用最小错判率准则比使用传统窄带信号能量检测判决准则能在干扰系统先验信息未知的情况下获得更好的信号检测性能.
刘子扬彭涛郭海波王文博
关键词:感知无线电宽带
宽带能量检测性能及噪声不确定度约束下的观测时长分析
2013年
该文针对基于最小错判概率准则对宽带采样信号进行判决的情况,讨论了检测概率、虚警概率与观测时长的置换关系,得到了在采用上述判决门限条件下,达到规定的检测概率和虚警概率所需要的最小观测时长的闭式表达式。此外,该文还讨论了噪声不确定性对检测性能约束条件下的最小观测时长的影响,得到了在噪声峰值不确定度给定情况下的最小观测时长表达式。数值仿真结果验证了该文结论的正确性。
袁龙刘子扬彭涛王文博
关键词:认知无线电虚警概率
全盲频谱感知:噪声估计与能量检测联合迭代算法被引量:8
2013年
在目前能量检测的算法中,通常假设噪声水平是一个已知量,然而在实际应用中,环境噪声通常都是需要实际测量才能得到的。该文针对无法利用已知空闲频谱测量噪声功率的信号检测情况,提出了一种基于迭代的宽带频谱能量检测算法,能够针对先验信息全盲的宽带抽样信号进行有效检测。文中针对迭代算法进行了收敛性分析,当迭代初值选取合理时,算法可以稳定收敛。仿真结果表明,观测时长为20以上时,迭代算法就能有十分良好的性能。
劳子轩刘子扬彭涛王文博
关键词:无线通信频谱感知宽带信号迭代
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