m***b
发帖数: 265 | 1 wap-psk 设了10位的密码， 破解理论上要多长时间 ？ |
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r****y
发帖数: 26819 | 2 常见的PSK都有陷门吗？这些公钥算法不能经受chosen cipher text attack吗？
就谈谈这个简单的理论问题吧？ |
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t*****g
发帖数: 113 | 3 昨天还好好的， 今天怎么也连不上了。 重新安装后才好。 会是什么原因呢？rounter的
location会有影响吗？我把他赛在墙角里，电视后面。
Linksys Wireless router WRT54G. WPA-PSK authentication. TKIP data encryption.
OS: WinXP Pro
Thanks a lot! |
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x***i
发帖数: 61 | 4 基本配置：
路由器： linksys BEFW11S4 (ver. 4)，仅支持WPA/TRIP加密方式，不支持AES.
电脑： Dell Inspiron 700m，Intel PRO/Wireless 2200BG 网卡，操作系统windows
XP SP3，装KAV 8.0杀毒软件（但是好来卸掉了，怕是因为这个）。
问题：使用WEP加密和不用加密，或MAC address filter都可以很好的上网，但是用WPA
(WPA-PSK)就死活连不上了。尝试过更新驱动等，但没有解决。同时，家里另外一台
Lenovo X61s却可以使用同样的WPA加密key上网，没有任何问题。
请大虾帮帮忙啊，我都把我的笔记本折腾得蓝屏了上十次了，还是没有解决。 |
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t*******g
发帖数: 373 | 5 台式PC，32位Vista SP2。家用最新TP-Link无线路由和PC无线网卡。原先网络设置了密码，每次想将台式机无线连进网，总要重启路由器，否则就是红叉子，说计算机储存的安全设置和网络不匹配。但实际情况是设置都是一样的，路由用的WPA2-PSK，台式机选的是WPA2-Personal，密码也对。有时即便连上了，打开其他PC，其他PC连上网后，会把这台PC挤下来，最后还得重启路由，就又能连上了，设置都没改。家里其他笔记本、另一无线连接的台式机、iPhone都没问题，随时关机下网，开机连上。
后取消了网络安全，就没问题了。但之前有安全的时候，台式机的网络安全设置、密码等明明是和路由器的设置匹配的...... 抓狂了。
我不能总这么不设密码啊，求高人指点，拜谢先。 |
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P***a
发帖数: 4213 | 6 除了安全类型匹配以外，加密类型也要匹配，换一个加密类型试试
密码，每次想将台式机无线连进网，总要重启路由器，否则就是红叉子，说计算机储存
的安全设置和网络不匹配。但实际情况是设置都是一样的，路由用的WPA2-PSK，台式机
选的是WPA2-Personal，密br />
，台式机的网络安全设置、密码等明明是和路由器的设置匹配的...... 抓狂了。 |
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j******1
发帖数: 1315 | 7 昨天刚听报告说PSK多么神奇，今天就发现2大坨，长在树根上。刚好知道一个亲戚一个
好朋友分别得了肺癌和乳腺癌。不如直接弄点灵芝提取液试试。拜托大家看看这是灵芝
吗？ |
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C******e
发帖数: 1850 | 8 Sorry I missed one important item in my previous post, which is the carrier
frequency of the MPSK. So please allow me to restate the problem as follows.
If a communications transmitter and receiver both use a sampling rate of Fs
at the DAC and ADC, and use MPSK modulation, we know that the maximum symbol
rate possible is Fs/2. However, suppose the carrier of the M-PSK is
generated in the digital domain with the same sampling rate of Fs, there is
a hard limit on the number of bits per symbol. Let |
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C******e
发帖数: 1850 | 9 假设我有一个数据文件，文件内容是完全随机的数据，现在我以每秒100个的速度把数
据读出来，并打算把它们通过调制的方法传送出去，我有两个问题：
1. 我的数据速率是100符号/秒，如果用PSK调制，那么载波频率至少应该是多少呢？
2. 当我按100符号/秒的速度读数据的时候，这个数据流的带宽是多少？按照奈奎斯特
定理，似乎应该是小于50赫兹，但是前面说过，这些数据是纯随机数据，难道不应该是
个宽带信号么？
请板上高手指教。 |
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k*******d
发帖数: 1340 | 10 1, 载波频率大大与带宽就行，1K以上都行吧
2， 我觉得应该还是100Hz，原因是Nyquist准则是在基带上说的，基带上的带宽是50Hz，但是调制
以后负频率部分变到正频率了还要占50Hz，这里用的是PSK，正负频率不对称，还是要传双边带信号，
所以是
100Hz（这一点我不确定，希望高人能够指点），纯随机二进制数据和宽带信号没啥关系啊，
还是窄带的 |
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V******i
发帖数: 306 | 11 PSK的带宽用Carson's rule估计。 |
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k*******d
发帖数: 1340 | 12 ?? 我知道FSK带宽用Carson's rule估计，PSK也用吗？ |
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z*****n
发帖数: 7639 | 13 Well, does the OP's 100"symbol"/sec mean bitps or byteps?
I take bit here.
For PSK (and I assume 2PSK here) applied, as long as
the receiver can detect the phase correctly, the carrier
frequency can be the same as the symbol rate, which means
in each symbol interval if the carrier can complete one
2*pi cycle, the detector can figure the data out.
50Hz，但是调制
要传双边带信号，
关系啊， |
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V******i
发帖数: 306 | 14 Man, these are basic questions of the undergraduate communication course.
You can easily find the answer in any communication textbook. If you don't
have these basic concepts, you won't understand the answers given here
either. For example, if you do not know Carson's rule, there is no way you
can understand the bandwidth of PSK or FSK. You also messed up the concepts
of data rate, symbol rate, sampling rate, etc. How can anyone really teach
these concepts on BBS... |
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V******i
发帖数: 306 | 15 The file symbols do not have to be equivalent to the transmitted symbols.
Carson's rule is used to estimate the bandwidth of PSK and FSK. If you
assume transmitted symbols must be the symbols you read from the file, then
your transmitted symbol rate is R. If you assume M-ary ASK, then your
transmission bandwidth must be at least R/2. But, this is a toy question, no
one really do this in practice. |
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k*******d
发帖数: 1340 | 16 PSK,PAM不算难，我觉得Goldsmith的wireless comm.就讲得不错 |
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f********e
发帖数: 195 | 17 他问的是floating 金属地时，地（其实就是一floating金属片）上的干扰能否发射出
去的问题，跟什么dipole辐射，调制，psk两回事，你这是not to the point
现在搞EE的真脑残，经典电动力学没学过？最基本的dipole辐射都不知道，还他妈的
true GND,算交流电呢？ |
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d*b
发帖数: 21830 | 18 电磁场和电磁波里面的偶极子辐射不懂倒算了，连无线电通讯里最基本的modulation都
没听说过，你不懂PSK，FSK，spread spectrum倒也算了，竟然整个公司都没人听说过
这些概念。 |
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a**e
发帖数: 370 | 19 举个例子吧。
我是学power的，高压的。做高压线路设计。
我就不懂：
电磁场和电磁波里面的偶极子辐射
modulation
PSK，FSK，spread spectrum
当然了，我本来也不说我是EE的，就说我是power的。可是在美国power被归为EE，我也
没办法啊。 |
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g******s
发帖数: 410 | 21 Effect of imperfect phase and timing synchronization on the bit-error rate p
erformance of PSK modulations
Thanks a lot for your kind help!
z******[email protected] |
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c*********n
发帖数: 87 | 22 The intern position is located in Maryland.
The requirement is as follows:
1. Required experiences/techniques
o Ph.D. student at last two years
o Wireless communications related classes
o Direct experience on the system design and performance comparison of
FDMA, CDMA systems
o Link-level and system level wireless communication system performance
evaluation
o Pseudorandom noise code design, such as gold code
o Direct experience on evaluating spectrum efficiency of various
mod... 阅读全帖 |
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c*********n
发帖数: 87 | 23 The intern position is located in Maryland.
The requirement is as follows:
1. Required experiences/techniques
o Ph.D. student at last two years
o Wireless communications related classes
o Direct experience on the system design and performance comparison of
FDMA, CDMA systems
o Link-level and system level wireless communication system performance
evaluation
o Pseudorandom noise code design, such as gold code
o Direct experience on evaluating spectrum efficiency of various
mod... 阅读全帖 |
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c*********n
发帖数: 87 | 24 Intelligent Fusion Technology (IFT) is a Research and Development (R&D)
company focused on information fusion technologies from basic research to
industry transition and product development and support. IFT is located in
Germantown, Maryland. We are working on modeling, control, communication,
signal/image/speech/text processing, security, autonomy, and decision making
in networked systems. We are looking for talented developers majoring in
engineering (e.g., EE, ME, AE), computer science, appli... 阅读全帖 |
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G**d
发帖数: 183 | 25 【 以下文字转载自 Prepaid 俱乐部 】
发信人: tjhaven (T嗨文), 信区: Prepaid
标 题: [合集] 折腾R+ tether方法总结
发信站: BBS 未名空间站 (Mon May 23 00:44:48 2016, 美东)
☆─────────────────────────────────────☆
llaalways (camper) 于 (Fri Mar 25 10:54:32 2016, 美东) 提到:
如果你的plan有tether， 你就不需要折腾。
这里的方法是用于plan没有tether， 或有tether addon 又不想买的。
首先，root手机，不想root的另想办法，这里总结的办法解决不了。
root的方法去google， 一般xda上的办法比较可靠。
moto e 2015的root方法在这里
http://www.xda-developers.com/how-to-root-the-moto-e-2015-and-unlock-the-bootloader-xda-tv/
root以后把以下方法多试几个，也许要几... 阅读全帖 |
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发帖数: 1 | 26 注意：RP正在剧变中，现在所有Ad计划都正在取消，Mad计划中原有的BBQ也可能取消。
取而代之的是限额较低的拨号器计划。
等RP尘埃落定后在修改攻略。
A． Ringplus简介：
Ringplus（R+）是Sprint的虚拟运营商（MVNO）。
Sprint信号好的地方Ringplus信号就好，
我个人的使用经验是Sprint信号跟ATT相当，比TMobile好，
没用过Verizon，不知道效果如何。
R+的特色是免费或低价的计划，如果选得好，电话，短信，和流量都够用。
R+号称之所以能免费或低价, 是因为他们使用了独家技术，可以投放广告。
我觉得他们投放的广告收益远不能维持这些免费或低价计划。所以R+能撑多久是个问题。
R+语音质量跟计划相关，在后面详细介绍。
个人认为RP的Ad计划一定不能用作主力电话服务。
RP的MAD计划可以作为主力电话服务。
R+的客服很差，电话基本打不通，有问题可以在论坛问，或者卡ticket。
R+也有在线chat， 但很难等到。
R+详细情况请看：
https://ringplus.net/
B． R+计划比较：
R+有4类计划。
1. 免费Mad... 阅读全帖 |
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w*******y
发帖数: 60932 | 28 Link:
http://www.amazon.com/gp/product/B003V17P4O
$22.99 Shipped
* Includes a 4 inch 5 DdBi Screw-On Swivel Rubber Antenna that can be
removed and upgrade up to 9dBi
* Includes driver for Windows 2000, XP 32/64, Vista 32/64, Windows 7,
Linux (2.4.x/2.6.x), Mac (MacOS 10.3 - 10.6)
* Plug-and-Play Compatible with windows 98SE, 2000, Millennium, XP and
Linux
* High security 64/128/256bit WEP Encryption, TKIP, 802.1X support, Wi-
Fi Protected Access - WPA, WPA-PSK, WPA II
* Comp... 阅读全帖 |
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w*******y
发帖数: 60932 | 30 ASUS 802.11n Wireless USB Adapter
newegg.com is offering the ASUS 802.11n Wireless USB 2.0 Adapter, model no.
WL-167G, for $2.99 after a $10 mail-in rebate slashing it to $2.99. With $1.
99 for shipping, that's the lowest total price I could find by $17.
Link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16833320061
It features a max speed of 150Mbps and supports WEP, WPA2, and WPA-PSK
encryption.
Deal ends February 7.
!!
|
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w*******y
发帖数: 60932 | 31 Link:
http://www.amazon.com/gp/product/B005FYGEII
USE PROMO CODE 15DISCNT
this one does not have the carrying case and sells for $37.99 so i guess
this is a good deal
Link:
http://www.amazon.com/gp/product/B002BFMZR8
The Alfa AWUS036H is the latest version of the most powerful card available.
This has a stunning 1000mW output power. So if you are looking for a device
to connect to an outdoor 2.4 GHz antenna, such as on a boat or an RV, this
is a perfect solution. It outperforms wireless cards th... 阅读全帖 |
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G*******s
发帖数: 10605 | 32 【 以下文字转载自 SmartShopper 俱乐部 】
发信人: GoRockets (火箭加油), 信区: SmartShopper
标 题: Cisco - Valet Wireless Hotspot (Wireless N Router) $25
发信站: BBS 未名空间站 (Fri Nov 25 22:49:10 2011, 美东)
Walmart has this Cisco Valet 802.11n Wireless Router for $25 after instant
savings. The router features four 10/100 ports, WEP, WPA2, and WPA-PSK
encryption, parental controls, easy setup USB key. Dell has the same item
for $75.99. Shipping is free to local store or $2.97 to ship home.
http://userquote.com/forum/index.... 阅读全帖 |
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