-
OFDM信号频谱感10
说明： 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)
- 2020-11-19 21:19:37下载
- 积分：1
-
Delphi的XMLRPC
delphi xmlrpc-delphi xmlrpc
- 2022-03-20 04:10:49下载
- 积分：1
-
unsustainable under the agreement, users send frames, will first interception Ch...
非持续CSMA
该协议下，用户在发送帧之前，会先侦听信道的状况，如果没有其他站点发送，它就发送。若信道忙，它就等待一个随机的时间后重复以上动作。
对于某一帧而言，信道是否忙，即是看其绝对时间（FRAMETIME*i+dt）的前一帧时内（FRAMETIME*(i-1)+dt ~ FRAMETIME*i+dt）是否存在发送帧。若无则发送，有则等待一随机时间。
-unsustainable under the agreement, users send frames, will first interception Channel situation, if no other site sent, it sent. If Channel busy, it would wait for a random time to repeat the action. For a frame, whether the busy channel, that is, look at his absolute time (FRAMETIME* i dt) of a time (FRAMETIME* (i-1) dt ~ FRAMETIME dt* i) the existence of this frame. If not then this, then wait for a random time.
- 2022-03-16 02:26:57下载
- 积分：1
-
STEGANOGRAPHY
stenography a dip technique good one
- 2010-02-16 14:17:22下载
- 积分：1
-
v4-103
Recognition of characters greatly depends upon the features used. Several features of the handwritten Arabic characters are selected and discussed. An off-line recognition system based on the selected features was built. The system was trained and tested with realistic samples of handwritten Arabic characters. Evaluation of the importance and accuracy of the selected features is made. The recognition based on the selected features give average accuracies of 88 and 70 for the numbers and letters, respectively. Further improvements are achieved by using feature weights based on insights gained from the accuracies of individual features.
- 2013-03-19 00:20:55下载
- 积分：1
-
pvb-gambardbxxxx
save picture webcam to computer
- 2014-02-05 11:23:41下载
- 积分：1
-
VCD_management_system
C++实习作业，VCD出租管理系统，有查询，借阅，计费，记日期等功能(system of renting and management of VCD)
- 2015-11-21 10:33:09下载
- 积分：1
-
OFDM-BPSK
OFDM BPSK 仿真 (OFDM BPSK simulation)
- 2020-10-05 15:57:39下载
- 积分：1
-
12306_python
一、运行环境：
基于python2.7
二、原理:
图像识别基于tesseract
数据抓包使用httpwatch, IE，识别出所有的POST请求，获取各步骤中数据，分析页面里token等
三、用法:
修改conf_example.py里的买票信息, 然后运行
在不繁重情况下，可以验证提交买票请求，买完后自己去 未完成订单 页面付款
春运的压力环境下，有bug，待完善, python初学乍用，很多地方不 pythonic
四、Todo:
1. 压力下的抢票测试, fixbug
2. 寻找最优server ip
3. httplib 的接口需要封装,包括重连机制
4. 优化不必要的请求
(Author frankiezhu@foxmail.com
DATE: 20140108
)
- 2015-05-01 10:02:08下载
- 积分：1
-
Cp
说明： 对不同型号风机的功率因数曲线进行模拟，只要输入对应的风力机叶片半径和桨距角值即可。(For different models to simulate the power factor of the fan curve, as long as the input of wind turbine blade radius and pitch Angle value.)
- 2015-03-27 11:36:12下载
- 积分：1
