Develop Bugs

How many antennas does the Nexus have?

I've been trying to read up on MIMO and how the Nexus and other LTE phones offer more than one upload and download antenna (Multi In/Multi Out) to achieve the speeds we get. Does anyone have specifics on this on the Nexus?

The Nexus has a UE Category 3 chipset, so the baseband can support up to 2 antennas with a max download/upload of 102/51mpbs respectively when using two antennas. I do not know if it actually has two antenna arrays. Though, according to the FCC submission, all LTE700 emitters are in the upper left corner of the phone when looking at it face-on. The CDMA antenna is in the lower left corner, while the combined bluetooth/WiFi antenna is located in the middle of the right side of the device.
Personally, I don't think it has MIMO. I would expect there to be two separate locations on the phone for separate antennas, to minimize cross talk. But I'm not an engineer. I do know all LTE phones released for VZW are UE Category 3, except for Motorola's which have only be Cat 2 thus far (which still supports 2 antennas). So they could all potentially have dual antennas.

ATnTdude said:
The Nexus has a UE Category 3 chipset, so the baseband can support up to 2 antennas with a max download/upload of 102/51mpbs respectively when using two antennas. I do not know if it actually has two antenna arrays. Though, according to the FCC submission, all LTE700 emitters are in the upper left corner of the phone when looking at it face-on. The CDMA antenna is in the lower left corner, while the combined bluetooth/WiFi antenna is located in the middle of the right side of the device.
Personally, I don't think it has MIMO. I would expect there to be two separate locations on the phone for separate antennas, to minimize cross talk. But I'm not an engineer. I do know all LTE phones released for VZW are UE Category 3, except for Motorola's which have only be Cat 2 thus far (which still supports 2 antennas). So they could all potentially have dual antennas.
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According to this 2 x 2 MIMO is mandatory for Cat 3 devices. I can NOT vouch for the site's accuracy though because my wireless communications skill are not up to snuff.

It's very interesting, I looked and looked and couldn't find the answer to this question. I watched a video with a Verizon tech who said for LTE advanced they are increasing the number of antennas, but for the speeds some are seeing, I was expecting 2 x 2 in this device.
Any other ways to find this out?

2x2 would make sense , since I have seen 30Mbps uplink speed on my own device, which is in excess of what a single antenna can upload. A single Cat3 antenna should provide ~25.5Mb uplink. I haven't seed downlink exceed 51Mb, so I can't provide evidence.
However, I would caution against relying entirely on the specs. VZW's 4G network, as the first deployment, is held together with duct tape in places. Hell, there isn't even any network or baseband that handles VZW+anyone else on Earth, so even if VZ built to spec, nothing would be compatible. Point is, it wouldn't surprise me to hear they're shipping 1x1 Cat2/3 phones. I just don't know where they would put the other antenna. I looked for a teardown to see if someone had actually dissected the LTE array, but no dice.

I have seen a speedtest of a 71Mbps download speed. I don't know if it was real and I can't remember if it was a GNex. There are techniques to minimize crosstalk. This is a quote from an IEEE paper.
"Crosstalk between the different MIMO channels is shown to have a detrimental effect on MIMO performance. Such crosstalk can occur at the radio channel, between the antennas, and at the radio IC. Several architectural and circuit techniques are described that minimize crosstalk between the multiple radio chains co-existing on the same silicon die."

Signal boosters/amplifiers?

I'm looking for a signal booster for office use. Ideally, the coverage should be expandable of up to 40,000 square feet. 5-7k square feet is fine for now. Also, it needs to cover all major carriers (AT&T, tmobile, sprint, verizon). If the square ft coverage is too small (2.5k for example) then multiple devices will work also.
The ones I'm looking at are:
1. http://www.amazon.com/Wilson-Electronics-Booster-Includes-Directional/dp/B0023RRCP4
2. http://www.amazon.com/Wilson-Electronics-Signal-Booster-Office/dp/B001R4BTH6
3. http://www.ubersignal.com/surecall-force-5-five-band-80db-amplifier-by-cellphone-mate-cm5000-80.html
The third link is extremely expensive compared to the other 2. If anyone knows more about that company or can find reputable reviews on them, that would be great. Otherwise, I probably won't consider ubersignal.

nvus said:
I'm looking for a signal booster for office use. Ideally, the coverage should be expandable of up to 40,000 square feet. 5-7k square feet is fine for now. Also, it needs to cover all major carriers (AT&T, tmobile, sprint, verizon). If the square ft coverage is too small (2.5k for example) then multiple devices will work also.
The ones I'm looking at are:
1. DB Pro
2. AG SOHO 60
3. Force-5
The third link is extremely expensive compared to the other 2. If anyone knows more about that company or can find reputable reviews on them, that would be great. Otherwise, I probably won't consider ubersignal.
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I have a Wilson DB Pro in my house so I can tell you a little bit about these products. The first one you list is a DB Pro which is a 65 dB amplifier, it's similar to the one I have except mine has a directional antenna. With a good outside signal, you can get up to 5,000 sq ft. of coverage with a directional antenna. With the omni you have listed, getting 2500 sq ft with a good outside signal is more likely. The second device you have is an AG SOHO 60 dB amplifier. With an omni antenna, you're probably looking at around 1500 sq ft of coverage. These two are consumer grade signal boosters dual band signal boosters.
The last one is a giant. It's 80 decibles which means it's 32 times more powerful than the DB Pro and 100 times more powerful than the AG SOHO 60 (100x more powerful but only 10x more expensive, starts looking like a better deal!). It's also a 5-band amplifier where the others are 2-bands so it will support more carriers and more networks. For you, I feel like the most important thing is that neither of the first two can be expanded to cover significantly larger areas, so that should automatically make them a deal breaker for your situation. And the last point I'll make is that you can not use multiple signal boosters within broadcast range of each other. If you do, you'll get feedback between them all which will cause them all to shut down. Not good, don't do it.
If you want to support all carriers including their new LTE networks, go with a Force-5, it'll be powerful enough for your 40,000 sq ft space depending on your outside signal strength. If you only need to support 2G and 3G networks, find the most powerful dual-band booster you can get. Wilson makes the AG PRo 75, that may work. I hope that helps.

Saltuo said:
I have a Wilson DB Pro in my house so I can tell you a little bit about these products. The first one you list is a DB Pro which is a 65 dB amplifier, it's similar to the one I have except mine has a directional antenna. With a good outside signal, you can get up to 5,000 sq ft. of coverage with a directional antenna. With the omni you have listed, getting 2500 sq ft with a good outside signal is more likely. The second device you have is an AG SOHO 60 dB amplifier. With an omni antenna, you're probably looking at around 1500 sq ft of coverage. These two are consumer grade signal boosters dual band signal boosters.
The last one is a giant. It's 80 decibles which means it's 32 times more powerful than the DB Pro and 100 times more powerful than the AG SOHO 60 (100x more powerful but only 10x more expensive, starts looking like a better deal!). It's also a 5-band amplifier where the others are 2-bands so it will support more carriers and more networks. For you, I feel like the most important thing is that neither of the first two can be expanded to cover significantly larger areas, so that should automatically make them a deal breaker for your situation. And the last point I'll make is that you can not use multiple signal boosters within broadcast range of each other. If you do, you'll get feedback between them all which will cause them all to shut down. Not good, don't do it.
If you want to support all carriers including their new LTE networks, go with a Force-5, it'll be powerful enough for your 40,000 sq ft space depending on your outside signal strength. If you only need to support 2G and 3G networks, find the most powerful dual-band booster you can get. Wilson makes the AG PRo 75, that may work. I hope that helps.
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Do you have a source for all this information? Or reputable reviews? I believe you, but I'm just curious.

nvus said:
Do you have a source for all this information? Or reputable reviews? I believe you, but I'm just curious.
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Most of the information about the DB Pro and the AG SOHO 60 I remember from when I was shopping for my DB Pro. The Amazon page for the DB Pro says it's 62 dB, but I checked my manual and it's actually 62 on one frequency band and 65 on the other. It also saying 5,000 sq ft. for the DB Pro, but I'm only getting about 2,000 out of mine and I have a 4 bar signal outside, so I have a hard time beleving it could do 5k. The Amazon page for the AG SOHO 60 says it can cover 2500 sq ft and I don't have any experience with that one, so it may be correct.
I had to look into the Force-5 a bit because I hadn't seen that before. The UberSignal site had some good data and the manufacturers site Surecall dot com filled in some of the gaps.
Let me know what in particular you'd like to see a source for. I would post some links but I have a new account and it won't let me include links in my posts.

Note2 and TP-Link TL-WDR4300

hi guys!
i have a dual band wireless router TP Link TL-WDR4300 and according to the specifications the speeds should be up to 300Mps on 2.4Ghz band and up to 450Mps on 5Ghz band.
note2 is also dual band but i can get maximum 72Mps on 2.4Ghz band and maximum 150Mps on 5Ghz band even if i keep my phone at 1m from the router.
more then that the speed is rapidly decreasing to very low values and i can get better values only if i stop wifi and the restart it. in the wifi menu i switched "power save" option to off but i can't see any changes.
i also have an "android pc" imito mx2 and with this i get up to 135Mps on 2.4Ghz band.
so, my questions are:
1. why my note2 can't achieve maximum speed values and what can i do to get closer to those maximum values?
2. why the speed decrease shortly after initial connection and what ca i do to keep my connection at higher speed all the time?
i think that speed fluctuations can be a router issue (if someone can advise with router i'll be glad), but high speed limitation and fast decreasing in speed seems to be note2 issues.
any suggestion is welcomed!
thank you very much!

nobody? even with different router?

common guys!
there are so many smart people here, not even one with this problem or with an ideea how to solve it?
thank you!

Hi
Theres no answers as this is common issue and there are lots of threads about it.
In short: Your speeds are very good almost maximum You can get. Dont belief in marketing mumbo-jumbo 450mbit/s. Nobody see such speeds in real life. ln reality, You can safety bet 10 to 15 MB/sec is max You can get from Wifi.
There are special hardware configurations where lts possible to reach higher speeds but not in this case.
As general 2.4 ghz gives you wider coverage area but lower max speeds. 5ghz gives you smaller coverage but higher speeds. You need to check carefully which standard gives you better connection speed and stability in your particular case.
Wysyłane z mojego GT-N7100 za pomocą Tapatalk 2

Is your WDR4300 with stock firmware? I would suggest to try DD_WRT (or Gargoyle) which gave mine a boost for everything. Need to follow the instruction carefully though when flashing the third party firmware, if you haven't done it before.

can you please give me the link with the last dd-wrt firmware and with the instructions?
thank you!

its normal thats how BCM 4334 works
http://www.broadcom.com/products/Wireless-LAN/802.11-Wireless-LAN-Solutions/BCM4334

ok, thank you for the info!
now i have:
- note2 - 72 or 150Mbps
- nexus7 - 65Mbps
- iMito MX2 - 135 Mbps
- toshiba notebook - 54Mbps
- ipad2 - i don't know but it has the most stable link
- iphone5 - same as ipad2
is that confusing or what?

^^
Note 2 support a/b/g/n max link @2.4Ghz at 72Mbps , max link @5Ghz with 40 Mhz ( channel bounding ) 150Mbps
N7 only support b/g/n 2.4Ghz @65Mbps
iMito MX2 : IDK
ur notebook @54 mean its only b/g wireless which max link can be 54Mbps
ipad 2 support 2.4Ghz and 5Ghz max link at 65Mbps
iPhone 5 use the same chip as Note2 broadcom 4334

It is all about channel width... 20mhz 40mhz or vth80 (40+40 mhz) capable of speeds up to 150, 300, and 450 mbp . Depending on client... 1x1, 2x2 or 3x3... (Hell they are about to release a 4x4 capable router even though the clients don't exist yet)
Good read...
http://www.dd-wrt.com/wiki/index.php/Atheros/ath_wireless_settings
See cannel width section
The Galaxy Note II is equipped with Broadcom BCM4334 chipset for the IEEE 802.11 a/b/g/n Wi-Fi connectivity in 2.4 GHz and 5 GHz dual-band with maximum rate up to 150 Mbit/s
That makes the GN2 only a 1x1 capable client folks [the OP was connecting at max speed]
Further WiFi security settings can also cripple speed. WEP is not secure and slowest... WPA is better.... WPA security algorithm also come into play...
To reach top end of speed limits (on your 1x1 client, or any other) router should be set to:
security mode: WPA2
WPA alogrithm: AES (not TKIP or TKIP+AES)
To the folks that said you can't achieve top speeds.... Go read up on how to configure your router
(And learn what top speed limitations are given your router hardware, and hardware in each of your client devices)
Edit:
PS. you did not specify the hardware revision of your TP-Link TL-WDR4300
check for it on https://wikidevi.com/wiki/Main_Page
assuming a v1 for the sake of example:
Model WDR4300
H.W. rev 1.x
FCC ID TE7WDR4300
Platform & Frequency [MHz] Atheros [email protected]
RAM [MB] 128
Flash [MB] 8
Wireless NIC SOC + Atheros AR9580
WLAN standard [802.11] b/g/n 2x2:2, a/n 3x3:3 (respectively based on NIC above)
Serial port 1
JTAG port 1
Eth. port count 4 LAN, 1 WAN
Power Input [V/A] 12V 1.5A
Special Features Notes 2 USB 2.0, Gbit switch

Does it supports 802.11ac wifi ?

Hi,
it's all in the title, many websites announced it provides 802.11ac (since it's the same 625 chip it would make sense) while the official spec doesn't, so, does it ?

No, 5 GHz n is max.

That there is no ac wifi can be a problem? Because I'm thinking about replacing my dear old LG G2 with this a2l, but that's one of the things that's blocking me.

GeNiO790 said:
That there is no ac wifi can be a problem? Because I'm thinking about replacing my dear old LG G2 with this a2l, but that's one of the things that's blocking me.
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Do you really need to download something at speeds over 300 Mbps on your phone?
There is already have 802.11n at 5 GHz.
And don't think that 5 GHz will ever supersede 2.4 GHz, because you should know that more high frequencies means less signal penetration through obstacles, but also more speed.

BubuXP said:
Do you really need to download something at speeds over 300 Mbps on your phone?
There is already have 802.11n at 5 GHz.
And don't think that 5 GHz will ever supersede 2.4 GHz, because you should know that more high frequencies means less signal penetration through obstacles, but also more speed.
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Why you defend the undefendable?
The "****ty" mediatek from the 2015s Redmi Note 2 already allowed Wifi AC
The Snapdragon 625 also can handle it, so this is another ****ty movement by Xiaomi
Also, your comment is kinda tech illiterate, because even when the THEORETICAL limit is 300Mbps that's theoretical and ideal conditions.
Yes, I want speeds over 300Mbps (which in best will translate into 30MB/s speeds) to transfer files wirelessly over my LAN or to browse with my 600Mb FTTH connection.

srgperez said:
Why you defend the undefendable?
The "****ty" mediatek from the 2015s Redmi Note 2 already allowed Wifi AC
The Snapdragon 625 also can handle it, so this is another ****ty movement by Xiaomi
Also, your comment is kinda tech illiterate, because even when the THEORETICAL limit is 300Mbps that's theoretical and ideal conditions.
Yes, I want speeds over 300Mbps (which in best will translate into 30MB/s speeds) to transfer files wirelessly over my LAN or to browse with my 600Mb FTTH connection.
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So, if you need 802.11ac and speeds over 300 Mbps, don't buy this phone. It's as simple as that.

BubuXP said:
So, if you need 802.11ac and speeds over 300 Mbps, don't buy this phone. It's as simple as that.
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It happens that I want a pure Andoird Phone sub 200$ with less than a TV for screen, so yes, this phone is capable of more than that's offering, which doesn't prevents me from being critical.

u363840 said:
Hi,
it's all in the title, many websites announced it provides 802.11ac (since it's the same 625 chip it would make sense) while the official spec doesn't, so, does it ?
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I think this phone can support wifi ac but you need to unlock bootloader and install custom rom to unlock dual band. I'm using redmi note 4 also have no wifi ac in spec sheet and also not available when scanning for 5ghz but after installing custom rom it is available.5ghz band is available in the chip but xiaomi locked 5ghz just to reduce the price of the device to avoid paying technology from qualcomm. I will buy this phone next week and i will give you guys feedback after using custom roms.for me why i need dual band wifi is because i'm using public wifi alot! So thats why i need a choice to avoid traffic which normally people just connects to 2.4ghz and less in 5ghz

Which rom you used for redmi note 4? Thanks
Tetelur said:
I think this phone can support wifi ac but you need to unlock bootloader and install custom rom to unlock dual band. I'm using redmi note 4 also have no wifi ac in spec sheet and also not available when scanning for 5ghz but after installing custom rom it is available.5ghz band is available in the chip but xiaomi locked 5ghz just to reduce the price of the device to avoid paying technology from qualcomm. I will buy this phone next week and i will give you guys feedback after using custom roms.for me why i need dual band wifi is because i'm using public wifi alot! So thats why i need a choice to avoid traffic which normally people just connects to 2.4ghz and less in 5ghz
Click to expand...
Click to collapse
I have also the redmi note 4 and I need the dual band, so the question about the rom you used. thks

novreisc said:
I have also the redmi note 4 and I need the dual band, so the question about the rom you used. thks
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theres wifi bonding module, rum 2.5ghz and 5ghz at 40mhz, should be satifactory. on some MTK solution AP it shows 300mbps link speed

Fastest WiFi speed?

Hello,
I have just switched fiber provider at my place (FTTH) and I am now getting a whopping 1000 Mbps on my connection via gigabit ethernet.
My ISPs internet "box" luckily comes with 4 gigabit ports but only 2.4 Ghz WiFi (...). Which means that what actually reaches my portable devices is somewhere between 20 to 70 mbps, depending on my location in the house.
So, I ordered a Netgear R6220 to connect to my ISPs box, whose WiFi I will disable, hoping to get the most out of my fiber connection.
I see that this router supports simultenous Dual Band (300 + 867) which should exceed my ISPs downstream bitrate. But I wonder whether the 835 on my P2XL will be able to benefit from the simultaneous Dual Band transmission.
According to the specs it should (https://www.qualcomm.com/products/snapdragon-835-mobile-platform):
Wi-Fi
Wi-Fi Standards: 802.11ad, 802.11ac Wave 2, 802.11a/b/g, 802.11n
Wi-Fi Spectral Bands: 2.4 GHz, 5 GHz, 60 GHz
Peak speed: 867 Mbps
Channel Utilization: 20/40/80 MHz
MIMO Configuration: 2x2 (2-stream)
Peak QAM: 256 QAM
Wi-Fi Features: MU-MIMO, Multi-gigabit Wi-Fi, Dual-band simultaneous (DBS), Integrated baseband
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But since the Peak speed is listed as 867 mbps, I'm not sure...
Anyone was ever able to max out the P2XLs WiFi speed?
Thanks!

This is mine today, I have seen higher from my wifi but this is right now.

This is the best speed i got using the 2XL
1Gbit line using a Asus RT-AX88U router.

Xeoc2 said:
This is the best speed i got using the 2XL
1Gbit line using a Asus RT-AX88U router.
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Wow, this is impressive! I didn't think our Pixels could reach that level of performance!
I guess that the bottleneck for me will still be on the router, then, since I'm not getting anything quite like yours (smaller budget).
I'm getting from Amazon an R6220 and a couple of Tp Links (archer c7 - 1750 and archer c1200), the best one gets to stay! ?

You should be able to reach decent speeds with any of those routers the only reason I bought this one is so i don't need to buy another rooter any time soon.

https://amplifi.com/
There you can find fast access point for low price with high quality, I use only these