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Description: 认知无线电能有效缓解无线电频谱资源匮乏问题，正交频分复用（OFDM）非常适合认知无线电系统。动态频谱资源分配是认知系统的一项重要功能。本文的目标就是最小化成本函数，这个函数考虑到主用户以及次用户的干扰功率。-Cognitive radio (CR) is a promising concept for improving the utilization of scarce radio spectrum resources. Orthogonal frequency division multiplexing (OFDM) is regarded as a technology which is well-matched for CR systems. Dynamic resource allocation is an important task in such systems. A novel resource allocation algorithm for multiuser OFDM cognitive radio system is presented in this paper. The objective is to minimize a cost function which takes into account the interference
power experienced by the primary user as well as the base station transmit power for secondary users given minimum bit rate requirements for each secondary user.
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Size: 201728 |
Author: 洪波 |
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Description: 限幅方法降低OFDM系统误码率，不通限幅率的比较曲线-reducing the OFDM PAPR with different CR in Clipping methord
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Size: 2048 |
Author: liyong |
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Description: 认知无线电技术检测技术，包括能量检测，周期检测等的仿真及分析-Detection of cognitive radio technologies, including energy detection, the simulation cycle of testing and analysis
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Size: 474112 |
Author: 王颖 |
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Description: 降低OFDM峰均比限幅方法CCDF曲线比较仿真程序。主要仿真参数为：子载波N=128,各支路采用16QAM调制，限幅率CR=1.4,仿真的OFDM符号数Nsymbol=10000。-Reduce the OFDM PAPR limiting method of CR = 1.4 CCDF curve simulation program. The main simulation parameters are: N = 128 sub-carriers, each branch with 16QAM modulation, limiting the rate of CR = 1.4, the simulation the number of OFDM symbols Nsymbol = 10000.
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Size: 1024 |
Author: 夏源 |
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Description: OFDM is one of the best physical-layer candidates
for cognitive radio (CR) systems, but rectangular pulse shaping
gives rise to large spectrum sidelobes and interferes with the
licensed user on the adjacent band. In this paper, an approach
is derived based on the signal continuity to measure the spectral
decay rate of the shaping pulse for OFDM.
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Size: 442368 |
Author: minal |
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Description: 通过介绍认知无线技术，让大家掌握基于CR的OFDM通信系统的搭建-failed to translate
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Size: 942080 |
Author: 杨晓 |
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Description: Spectral Efficiency Analysis in OFDM and
OFDM/OQAM based Cognitive Radio Networks
The future wireless communication is expected to
be able to improve the efficiency of spectrum usage. To solve the challenge of spectrum shortage, an innovative opportunistic spectrum access strategy, called Cognitive Radio (CR) has been proposed.
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Size: 165888 |
Author: Honaleum |
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Description: 认知无线电(Cognitive Radio,CR)的概念起源于1999年Joseph Mitolo博士的奠基性工作，其核心思想是CR具有学习能力，能与周围环境交互信息，以感知和利用在该空间的可用频谱，并限制和降低冲突的发生-Cognitive radio (Cognitive Radio, CR) concept originated in 1999, Dr. Joseph Mitolo s groundbreaking work, the core idea is CR with learning ability, can interact with the surrounding environment information to the perception and use of the available spectrum in the space, and to limit and reduce the incidence of conflict
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Size: 7168 |
Author: 刘朝选 |
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Description: we study the resource allocation problem for the multiuser orthogonal frequency division
multiplexing (OFDM)-based cognitive radio (CR) systems with proportional rate constraints.
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Size: 868352 |
Author: walid |
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Description: CR_OFDM系统中，自己编的，搜索没有被主用户占用的频带。-Compiled, CR in OFDM system, his search no band is occupied by a primary user.
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Size: 2048 |
Author: 韩杰 |
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Description: 前已提出的频谱感知方法主要包括匹配滤波器检测、 能量检测、 循环平稳特征检测以及多分辨率频谱感知. 这些方法均为单节点感知方法.然而，在阴影和深度衰落情况下， 单个节点的感知结果并不可靠， 因此， 需要对多个节点的感知结果进行融合，以提高检测可靠性， 即协作感知技术. 文献采用“或” 准则对各个 CR 感知结果进行融合. 文献则提出了基于 D-S 证据理论的协作频谱感知算法，虽然该算法的性能比“或” 准则或“与”准则要好， 但需要存储大量历史信息， 算法的计算复杂度也很高. 文献中分析了采用似然比检测(likelihood ratio test， LRT) 的软判决与采用“与” 准则的硬判决的性能， 结果表明采用软判决的协作感知性能更优(Previously proposed spectrum sensing methods mainly include matched filter detection, energy detection, cyclostationary feature detection and multi-resolution spectrum sensing. These methods are all single node sensing methods. However, in the case of shadow and deep fading, the sensing results of single node are not reliable, so, It is necessary to fuse the sensing results of multiple nodes to improve the detection reliability, i.e. cooperative sensing technology. In the literature, "or" criterion is used to fuse the CR sensing results. In the literature, a cooperative spectrum sensing algorithm based on D-S evidence theory is proposed. Although the performance of the algorithm is better than "or" criterion or "and" criterion, a large amount of historical information needs to be stored, The computational complexity of the algorithm is also very high. In the literature, the performance of the soft decision based on the likelihood ratio test)
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Size: 6144 |
Author: UU仔 |
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