Location:
Search - sd 11
Search list
Description: 首先,找出 上所有的极值点,然后用三次样条函数曲线循序连接所有的极大值点,得到信号 的上包络线 ,采用同样的方法连接所有的极小值点,得到 的下包络线 。循序连接上、下两条包络线的均值可得到一条均值线 :
(7-1)
再用 减去 得到 :
(7-2)
如果 满足IMF的两个条件,则 即为第一阶IMF,一般来说, 并不满足条件,此时,将 当作新的信号,重复上述步骤,即得:
(7-3)
这里, 为 的上、下包络线的均值。如果 仍然不满足IMF的条件,则继续筛选,重复上述方法k次,得到 :
(7-4)
在实际计算中,满足IMF的两个条件并不是一件容易的事,必须确定一个准则使筛选过程能够终止,Huang等提出可以利用两个连续处理结果之间的标准差SD来作为判据:
(7-5)
其中,T为原始信号的长度。决定筛选过程是否终止,SD值的选取是至关重要的。如果SD的值选的过小,会使IMF分量变成纯粹的频率调制信号,造成幅值恒定;如果选的过大,会使筛选的结果和IMF的两个条件相差太远。经验表明,SD的取值在0.2~0.3之间时为宜,既可保证IMF分量的线性稳定性,又可使IMF分量具有相应的物理意义。
当式(7-4)中的 满足SD值的要求时, 即为第一阶IMF,记为 :
(7-6)
第一阶IMF 包含着原始信号 的频率最高成份。从 中减去 得到频率较低的剩余信号,即残差 :
(7-7)
将 看作一新信号,重复上述EMD分解过程,经过多次运算可得到全部残差 :
(7-8)
当满足以下两个条件之一时,整个筛选过程即可终止。这两个条件是:(1) 或 小于预定的误差;(2) 为一单调函数,此时不可能再从中提取IMF分量。即使原始信号数据具有全局零均值,其最后的剩余分量仍可能不是零,对于有趋势的数据,其剩余分量就应该是该数据的趋势
Platform: |
Size: 491 |
Author: littleprince |
Hits:
Description: This packet is a IS-95 baseband simulation for 1 data channel of 9.6 KBps rate. The simulation is written for static channel and AWGN noise.
The packet include:
1) Packet Builder (Viterbi Encoding, Interleaver, PN generation)
2) Modulator (RRC filter)
3) Demodulator (Matched Filter, RAKE receiver)
4) Receiver (HD or SD) (Deinterleaver, Viterbi Decoder).
You should run "Simulation.m" function that include all modules.
Platform: |
Size: 10240 |
Author: 李南 |
Hits:
Description: This packet is a IS-95 baseband simulation for 1 data channel of 9.6 KBps rate.
The simulation is written for static channel and AWGN noise. The packet include:
1) Packet Builder (Viterbi Encoding, Interleaver, PN generation)
2) Modulator (RRC filter)
3) Demodulator (Matched Filter, RAKE receiver)
4) Receiver (HD or SD) (Deinterleaver, Viterbi Decoder).
You should run "Simulation.m" function that include all modules-This packet is a IS-95 baseband simulation for a channel data rate of 9.6 KBps. The simulati on is written for static channel and AWGN noise. The packet include : 1) Packet Builder (Viterbi Encoding. Interleaver. PN generation) 2) Modulator (RRC filter) 3) Dem odulator (Matched Filter, RAKE receiver) 4) Receiver (HD or SD) (Deinterl eaver. Viterbi Decoder). You should run "Simulation. m "function that include all modules
Platform: |
Size: 10240 |
Author: lisi |
Hits:
Description: 用STC89C58单片机做的数据采集和控制,11位AD转换使用mc1433,支持模拟量或数字量的读写-STC89C58 to do with single-chip data acquisition and control, the use of 11 AD conversion mc1433, support for analog or digital reading and writing
Platform: |
Size: 50176 |
Author: 郝芯 |
Hits:
Description: sd卡座封装尺寸pdf,11脚的封装,机械尺寸比较详细-sd card connector package size pdf, 11-pin package, a more detailed mechanical dimensions
Platform: |
Size: 149504 |
Author: zzy |
Hits:
Description: MIMO 基带检测算法 SD检测 matlab仿真 适用于QAM调制,解调-Sphere decoder for mimo system
Platform: |
Size: 2048 |
Author: wang xiaobo |
Hits:
Description: sd球形解码,用于mimo信道的仿真-sd
Platform: |
Size: 1024 |
Author: 王伟 |
Hits:
Description: sphereandML是主程序,性能接近最大似然ML检测,调用了spheredecode和spheredecodeinf两个子程序;-ml sd
Platform: |
Size: 5120 |
Author: 邱佳新 |
Hits:
Description: sd 球形解码算法的实现与仿真分析,与最大释然检测算法的对比仿真-sd ml
Platform: |
Size: 9216 |
Author: 邱佳新 |
Hits:
Description: stm32 sd LTM024D250液晶显示图片 -stm32 sd LTM024D250 LCD picture
Platform: |
Size: 4290560 |
Author: 雷小亮 |
Hits:
Description: this program is an implementation of mimo ofdm detection of qpsk signal using sd algorithm
Platform: |
Size: 1024 |
Author: ashish |
Hits:
Description: 该算法实现了球形译码算法SD的算法仿真,包含不同的调用函数,可以实现。-The algorithm implements the algorithm simulation sphere decoding algorithm for SD, including calling the function different, can achieve.
Platform: |
Size: 3072 |
Author: 王翠 |
Hits:
Description: sd optimization algorithm a
Platform: |
Size: 1024 |
Author: testup |
Hits:
Description: SD algortithm with optimal step size
Platform: |
Size: 2048 |
Author: testup |
Hits:
Description: SD code for optimization,with matlab
Platform: |
Size: 1024 |
Author: aghigh |
Hits:
Description: it s sd-ideal.matal code for optimization
Platform: |
Size: 1024 |
Author: aghigh |
Hits:
Description: 关于stm32 单片机读取sd 卡的.txt文件,实现读取功能(STM32 microcontroller on the SD card read.Txt file, to achieve the reading function)
Platform: |
Size: 866304 |
Author: ssssssq
|
Hits:
Description: 这是STM32F107芯片的SD卡模拟U盘的程序,经过测试。(This is the STM32F107 chip SD card simulation U disk program, tested.)
Platform: |
Size: 13548544 |
Author: hai1984
|
Hits:
Description: 振南嵌入式系统文件,帮助使用者快速掌握SD卡嵌入式开发。(Zhennan file to the embedded system, the embedded development to help users to quickly grasp the SD card.)
Platform: |
Size: 7847936 |
Author: yyjzd |
Hits:
Description: 支持MP3、WAV解码格式。
2、支持采样率(KHz):8/11.025/12/16/22.05/24/32/44.1/48。
3、24位DAC输出,动态范围支持90dB,信噪比支持85dB。
4、完全支持FAT16/FAT32文件系统,最大支持32G的TF卡,支持32G的U盘。
5、支持UART串口控制语音播报功能,可控制播放,暂停,选曲,音量加减等功能,最大选曲65535首曲目,波特率9600 bit/s。
6、支持IO触发功能,8个IO口单独触发8首曲目或8个IO口组合触发255首曲目。
7、支持One_line单总线串口控制,可控制播放,暂停,选曲,音量加减等功能。
8、支持3个配置IO进行模式选择。(Support MP3, WAV decoding format.
2, support sampling rate (KHz): 8/11.025/12/16/22.05/24/32/44.1/48.
3, 24 bit DAC output, dynamic range support 90dB, signal-to-noise ratio support 85dB.
4, fully supports the FAT16/FAT32 file system, maximum support 32G TF card, U disk support 32G.
5, support UART serial port control voice broadcast function, can control play, pause, music selection, volume addition and other functions, the maximum selection of 65535 pieces of music, the baud rate of 9600 bit/s.
6, support IO trigger function, 8 IO ports trigger 8 tracks individually or 8 IO ports combination triggers 255 tracks.
7, support the control of One_line single bus serial control play, pause, selections, volume addition and subtraction function.
8, support the 3 configuration IO for pattern selection.)
Platform: |
Size: 2486272 |
Author: 林一捆 |
Hits: