Simulation of antenna MIMO in VSS

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• Much worse compared with Z3C WiFi reception

  I had to spend to Z5C and usually it's good. Only difference I see is that wifi networks, I used until now have much worse signal! Is it because the Z5 reduce the sensitivity of the antenna or because the recent Marshmallow updated?

  Dude, I feel, honestly! I own a Z5C and my brother has the regular Z5 and see the difference in performance of WIFI coverage between these two, I feel a little disappointed. However, I think it's a hardware problem rather than a software problem. You see, Z5 uses antenna MIMO 2 x 2 design where Z5C uses 1 x 1 SISO arrangement. Where the Z5 MIMO comes into play in terms of bandwidth, to be able to establish connections to 867 Mbps Z5C can connect up to 433 Mbps. And some sources suggest that 2 x 2 often gives you a better coverage than 1 x 1 (Please someone correct me if I'm wrong, I'm no expert, I'm just saying what I had read earlier) layout of antenna. That said, I do not own a Z3C, nor have someone around that there I can't compare. However, after having updated from an old phone (Galaxy Note 2) with a design still 1 x 1, I expect WIFI coverage to be much better on this phone flagship of 2015 as it was on a 2012 flagship phone. Maybe tweaks software in future releases can help fix it...

• Cisco 1250 and AIR-ANT5959

  Hi all

  Ordering Guide 1250 Cisco indicates that AIR-ANT5959 can be used for 2.4 radio concert.

  1250 AP provides 3 connectors for dipole antennas but AIR-ANT5959 spec indicates that it comes with 2 BNC connectors. Are that we assume a dipole to stick on the rest connector? If this is the case, how can we identify which is the TX and RX, you can connect the AIR-ANT5959 to the respective radio without the performance impact? Any help much appreciated.

  see you soon,

  Andrée

  Hi Jean Miche,.

  The connectors on the side of the 1250 are the connectors of the transmission. Then, left and right. Way is not to ' receive '.

  So if you want to connect a 2 antenna connectors like the 5959, you need to plug it into the connectors on the left and right (the order is not important).

  Be aware that you lose the ability MIMO antenna being diversity and no MIMO.

  So for the IOS ap, you need to configure "antenna diversity of transmission" and "antenna receive diversity". That will prevent your 11n rate but works perfectly.

  WLC APs can be the same configured in the configuration of the AP WLC. You simply specify what a diversity antenan plugged into left/right only.

  Connecting a different antenna on intermediate connector would be a mistake because 3 antennas is used only in the case of MIMO and you cannot reach with a diversity antenna MIMO + another antenna on the middle connector.

  I hoep this helps, s

  Nicolas

  ===

  Please note the answers that will help you

• design of huge cell MIMO 3 x 3 using splitters and antenna external omni

  Hello

  The requirements are the following:

  Offers complete coverage for a basement.

  Maximum number of users competitor is between 5-10

  VoIPoWlan

  Low bandwidth

  In the basement is distinguished from corridors and technicrooms isolated by thick walls brick and metal doors.

  In order to ensure full cogerage voip would require a large number of AP they are quire expensive and high flow is not required.

  Is it a good idea to use only a few AP with dividers and external antennas?

  For example:

  1 x dual band AP 3 x 3 mimo

  3 x dispatchers dual band, each of them has 3 output ports

  3 dual-band 3 x 3 mimo antennas 2 omni and a directional

  The basement has 2 rooms and a corridor.

  Each of the rooms has an omni antenna installed, corridor has one directional.

  Antennas are connected by separators.

  Given that the cable lengths are not the same, I may need to use amplifiers also. Is this correct?

  What about the problem of the node that is hidden, when 2 wlan stations are connected to the same access point can not hear each other?

  This cell can be huge. I gave a small example, but in our project, we need cover a basement of a square that contains many rooms and corridors. Obviously, you must use several AP + combos splitter basically repeat this small example, I gave.

  The main goal is to save money by reducing the number of AP and switches. We did the sitesurvey we found that 40-45 AP is needed. My idea is to use up to 10 AP + battery separator.

  Has anyone done a similar deployment?

  The disadvantages?

  Thank you!

  István

  MIMO radios are filled with a lot of very complex mathematics.  It phase shifts handels, changes of time, reflections, roaming, etc..  You are wanting to fundamentally change the design of their operation.

  It will be terribly.

  If it were me, I would correctly, based on the your wireless site survey, or not at all.  I don't want to be associated with a design that works badly.  I would walk first of employment.  But that's me.

  It is your reputation and your choice.

• Spectral power sinewave AWR VSS level

  Hi all

  Could a good colleague AWR user wanting to help me with responding to a question concerning my use of a measure of the power spectrum - use of the SPECTRUM of VSS-> PWR_SPEC function?

  It's a simple question, but I think I need help from experienced users of AWR to help me.

  In VSS, I simply used a sine-source to generate a sine wave of 1 kHz with an amplitude of 1V (PIC)... in other words 2V peak-to-peak. Then I simply put this sinusoid through a real signal to the converter complex (R2C) module. And then I put in place two simple measures of VSS. A fair measure was to observe the time - the wave of the sine wave - to make sure that I was getting 1 kHz and 1V (peak amplitude). The other measure involved simply by using measurement of PWR_SPEC to look at the spectrum of the sinusoid.

  For a sinusoidal 1V peak, I calculate that the RMS 1/sqrt (2) amplitude. And if the reference resistance is 50 ohms, so I calculate that the power of the sine wave (Vrms ^ 2) / 50, which is 10 mW (IE 10 dBm).

  For the sine wave spectrum, I expect to see two spectral lines, one at 1 kHz with an amplitude of the component of 0.5 and a to 1 kHz (negative frequency) also of amplitude of the component of 0.5. In terms of power and with a 50 ohm reference resistor, then is the power in the component of 1 kHz (V ^ 2) / 50 = (0,5 ^ 2) / 50 = 5 mW. And the power of the component-1 kHz is also 5 mW. Thus, the sum of the power of these two gives 10 mW, which is what I expect because the total is equal to the computed RMS power above (in the sine wave).

  Now, in simulations of VSS, simulation results are indicating that the power of the component 1 kHz is 2.5 mW (i.e. 3.979 dBm). And also indicates that the power of the component-1 kHz is also 2.5 mW (3.979 dBm). So the results of the simulation, the total power is 5 MW, which is exactly half of the value I want.

  So for now, it seems that the levels of spectral power of the simulations of VSS components are always 3 dB LESS than what I calculate. So half the power is lost somewhere.

  Can I ask other users of AWR, if I set up the simulation properly (or not) and point me in the right direction? I think I'm just not using the Simulator correctly and just need some advice to put me on the right track. Or if I get things set up properly, then I'm missing an important step as the calibration for the measurement of another point of reference?

  SINUS block with a complex output, by default, uses the representation complicated envelope with a frequency equal to that of the sinus. So, if you place a measure of its output waveform, it will display a constant power of (1 + j0). The CTRFRQ = 0 setting will allow you to 'Center' of the signal in the DC and see a sine wave at its output. The spectrum of a complex sound signal will contain only a single tone to + value of the QRU. The two points to + FRQ and - FRQ, with 7 dBm power, each will be displayed only for a real signal if you view all frequencies in the spectral measure.

  You can find detailed information on this subject, as well as calculating corresponding, by doing a search on "complicated envelope representation" online. The main thing is that the complex representation of a sound signal will be A * [cos(2*pi*f*t) + j * sin(2*pi*f*t)]; However, when you use R2C you get only the real part, A * cos(2*pi*f*t), therefore half of the power you would get a SINE block with an exit node complex.

• Simulation of the AOS

  Hi Mr.Tayyab,

  I already asked you several days ago (reference #1948659), I can't always simulate the enclosed drawing. If you get the block of the MCO, you will see that on the scope after the R18 a 10 kHz sine wave. However, if we let the block of the MCO, as shown in the diagram, we can get something out of the R18, which is not fair. I don't see anything wrong with that. Could someone give me an idea? Individual block works perfectly.

  Thank you.

  Hello

  The reason why it is a problem because you have an another VSS in the AGC block that has the value 2, 5V. I changed the name of this source of tension and now the simulation provides the results as expected.

  I hope this helps.

• With the help of control and simulation module; e to get the time the MISO model Manager

  Hello

  Please can someone show me how to find the response time of the system below using the module control and simulation?

  (y (k) - 1,7407 y (k-1) + 0.6236y (k-2) + 0.1782y (k-3)) =-0.0932 u(k-1) + e (k)

  where there is out, u came and e is a white noise.

  I tried to enter the CD construct MIMO model, then connect it to CD response time. * s vi.

  But what I really need to enter the model coeffs every time? and I still don't see the answer!

  Help, please...

  Kind regards

  ruser

  Hello

  you have the correct image... I used the Toolbox ID sys (Assistant)... to estimate the system model...

  and I tried all week last get the model of my system in labview for use the control on this module.

  Alhamdulillah...

  I ended up doing... I saved the template to a file from the Toolbox id sys... (my model is in discrete form) then I loaded it in labview using load file pattern...

  so now I in labview...

  now for control parts... ..

  Thank you again...

  ruser.

• WAP 200 with external antenna

  Hello

  I connected an external 12dBi omnidirectional antenna for networks 2 .4GHz (TL-ANT2412D) with LMR-400 cable, 5 M

  but my antenna "emit" nothing, I have no signal. With the two antennas supplied with WAP200 I signal but does cover all of the desired area.

  Could you tell me what setting to change?

  Thank you.

  Hi, my name is Eric Moyers. I am a network Support Engineer in the Cisco Small Business Support Center. Please use the Forums to Post community of Cisco.

  The WAP200 is 1 X 2 MIMO, which means that it transmits on an antenna and receives two.

  (1) we do not support the 3 antennas of the party.

  (2) I would try attaching the antenna 3rd in Group at the other station.

  I know that customers who have had success by adding 3 antennas of the party, but there are no promises.

  Thank you

  Eric Moyers

  Support of Cisco network engineer

  SME HWC Wireless and monitoring

  CCNA, CCNA-wireless

  1-866-606-1866

• MIMO 5 GHz outdoor deployment.

  Hello..

  We are interested in adding 5 GHz N MIMO to our existing 2.4 ghz wifi outdoor hotspots. We currently have 3 x 1310 ap popular with off-road MSO24014 antennas (seen in the photo attached) at the top of the towers of 19 feet...

  I'm looking to either 3 x 1532E AP is paired with 8 dBi antennas AIR-ANT2588P3M-N or 3 x 2603 paired with the AIR-ANT2566P4W-R antenna 6dBi.

  Here are my questions:

  The 1532E has a 27dbi tx power (500mw), while the 2603 has only one power TX 23 dbi (200mw)... Both are obviously better than the 1310's 20dbi tx (100 MW) power. But how much is too much? It seems that these 1532e to complete tx paired with 2588P3M antenna 8 dbi could push the signal too far for mobile devices respond.

  I'm curious to know how a cisco dbi omni antenna 5 run on these tours if it is mounted on the structure of the metal tower. The towers would not a time due to obvious reflection size would be the cause?

  I thought to put the antennas around the mark of 17 feet...

  My goal is to make the existing towers while leaving the 2.4gh only pure 5 GHz N MIMIO. Bringing cellular coverage in good quality coverage but not too much because he is an RV Park.

  I'm curious how an omni 5 dbi cisco antenna would perform on these towers if mounted on the metal tower structure. Would it be a waist of time due to the obvious reflection pattern the towers would cause?
  

  The antenna you will use are directional antenna.  The "reflection" of the tower is very neglibable.

  I was thinking about placing the antennas around the 17 foot mark.
  
  

  You tilt the antenna patch up a few degrees to the ground.

  The question you have is that roof of these recreational vehicles are made of metal.  Unless you have an external antenna that comes out, the signal, or some of them will be bouncing off the roof.

  But how much is too much? It seems like these 1532e's at full tx paired with the 8 dbi 2588P3M antenna might push the signal too far for mobile devices to respond
  
  

  Your assumption is correct.  Too much power does not guarantee that the antenna could pick up the response from customers.  Another thing, how do you intend to deploy the AP and the antenna.  More co - ax between the AP and the antenna cable more signal loss is going to be.

• Placement of external antennas SRI 1941 WIFI-AP

  Hello!

  We have 1941 SRI with builtin WiFi-AP that uses three antennas. I want to cover three floors with this access point using external antennas to separate floors. The left and the right antennas can be used for transmission and reception and community antenna can be used to receive only. I have installed an external antenna (Omni, 8 dB) on the first floor and the second floor. But the quality after it is much worse compared to using only the internal antennas. What I am doing wrong? Is it possible that all these antennas will be parked strict near each other?

  Thank you!

  Hmmmm... Nuts.  I hate doing this because people do not like to be told that they bought the wrong things.

  Right, here go us.  You have a problem.  You want a controller on the right?  The question is what the 'size' is your controller.  I'm talking about APs how a controller must support, YET.  Y'see the smaller controller that can fit into a router is the NME-WLC.  Now the problem is, is that this module is NOT supported on a 1900 chassis.

  So let's rewind back and start from the base.  Now you have a 3 story building and want Wireless 'wall '.  You are right that you need a controller.  I won't recommend WLC 2504 controller but I highly recommend the 5508.  As you know the controller can support 12, 25, 50, 100, 250 or 500 APs.  All what you need to do is, for example, pay for 12 APs support (excluding the AP, of course) and if you need more supprted APs (like 50) then it's as simple as a license update.

  Then, what model of AP.  You have the choice: 1040 if you want 2 x 2 MIMO 802.11n, 1140 if you want MIMO 2 x 3 & 802.11n, 3500 is you want CleanAir.  Your choice.

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  Hello

  I am a first time Mac user. Bought a Mac Mini to learn the Swift program.

  Version of the OS - OS X

  Version of Xcode - 7.3

  How to set the Simulator to show the correct output? After placing a button and the execution of the code, the button is placed in various different places for iphone versions.

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  Hello

  How can implement you not with Time Capsule and AirPort their simulation on the iMac?

  I don't know what you're asking.

  AirPort Extreme is a wireless router.

  A Time Capsule airport is an AirPort Extreme with a built-in hard drive for data storage.

  An iMac is a Mac computer.

  An iMac is not a wireless router, so he is unable to perform the functions of a wireless router.

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  My iphone 32 5 s is perfect, like new, but since yesterday the anntenna internal wifi is broken. We can replace it in an apple store?

  I'm sure that the wifi antenna is broken is not a software problem.

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• Mac Book Pro, outdoor WiFi antennas work to extend wi - fi range when plugged into USB PORTS

  Outdoor WIFI antennas work if plugged into the USB port on the Mac Book Pro. If they do, those who extend range of transmission and reception wi - fi?

  Sorry, but I've never used an external USB wifi antenna but if you describe your use case a wifi Repeater/Extender can be a good option for you. https://www.repeaterstore.com/pages/WiFi-booster-Repeater-Extender-differences

  If the option is not a Repeater/Extender so will have to wait for someone who has used an external USB antenna down to.