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UBNT-Matt
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AirFiber Receive Sensitivity / Modulation Specs

Hi guys,
I know a few of you were looking for these, here are some preliminary specs based on our tests. Once these figures are finalized, they'll be added to the spec sheet:

100MHz Chan Sensitivity FDD Capacity TDD Capacity
64QAM -66 1500 760
16QAM -72 1000 507
QPSK MIMO -78 500 253
QPSK SISO -80 250 127


-Matt
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Josh_SPITwSPOTS
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Re: AirFiber Receive Sensitivity / Modulation Specs

Sticky plz until added.
Josh Reynolds :: Chief Information Officer :: www.spitwspots.com
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David2011
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Re: AirFiber Receive Sensitivity / Modulation Specs

Hi guys,
I know a few of you were looking for these, here are some preliminary specs based on our tests. Once these figures are finalized, they'll be added to the spec sheet:

100MHz Chan Sensitivity FDD Capacity TDD Capacity
64QAM -66 1500 760
16QAM -72 1000 507
QPSK MIMO -78 500 253
QPSK SISO -80 250 127

-Matt


Just, why is TDD less capacity than FDD? is it correct - full duplex is faster than TDD?? Then, what is the benefit of less bandwith of TDD? Or I´m missing somethink... ?
www.wlanmall.com/tdd_vs_fdd_wireless_backhaul.php
I vote for 17GHz AirFiber version:icon_lol: .
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Pojitko.cz
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Re: AirFiber Receive Sensitivity / Modulation Specs

Hi guys,
I know a few of you were looking for these, here are some preliminary specs based on our tests. Once these figures are finalized, they'll be added to the spec sheet:

100MHz Chan Sensitivity FDD Capacity TDD Capacity
64QAM -66 1500 760
16QAM -72 1000 507
QPSK MIMO -78 500 253
QPSK SISO -80 250 127


-Matt


Chmm I got wrong for 1 dB, I estimated -67 for 64QAM, Matt you have probably mistake in descriptim FDD capacity is always written in capacity of one way.. What you wrote it has TX and RX sum capacity of 3Gbps. Which is nearly nonsense. It is the same as you will write the Fast ethernet is 200Mbit FDD..
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Josh_SPITwSPOTS
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Re: AirFiber Receive Sensitivity / Modulation Specs

Chmm I got wrong for 1 dB, I estimated -67 for 64QAM, Matt you have probably mistake in descriptim FDD capacity is always written in capacity of one way.. What you wrote it has TX and RX sum capacity of 3Gbps. Which is nearly nonsense. It is the same as you will write the Fast ethernet is 200Mbit FDD..


Would that deviate from most wireless company marketing material though? From what I've seen they always show aggregate bandwidth.
Josh Reynolds :: Chief Information Officer :: www.spitwspots.com
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Re: AirFiber Receive Sensitivity / Modulation Specs

Just, why is TDD less capacity than FDD? is it correct - full duplex is faster than TDD?? Then, what is the benefit of less bandwith of TDD? Or I´m missing somethink... ?
www.wlanmall.com/tdd_vs_fdd_wireless_backhaul.php

FDD = two channels, TDD = one channel
I'm assuming.
Josh Reynolds :: Chief Information Officer :: www.spitwspots.com
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David2011
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Re: AirFiber Receive Sensitivity / Modulation Specs

FDD = two channels, TDD = one channel
I'm assuming.

OK, but inside his table is 100MHz not 2x100MHz. Anyway your post could be correct if it is 2x100MHz for FDD and only 100MHz for TDD.
I vote for 17GHz AirFiber version:icon_lol: .
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Pojitko.cz
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Re: AirFiber Receive Sensitivity / Modulation Specs

Would that deviate from most wireless company marketing material though? From what I've seen they always show aggregate bandwidth.


They allways used to produce TDD..:icon_biggrin:
But FDD is (Frequency division duplex) is one way there, second back. So then it is FDX.. It is even marketing nonsense to tell 1500Mbit on Gbit interface.. You will never get over 750 Mbit one way, there fore you cant say it.. Same on Fast ethernet.. It is matter of fact..
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boriquajake
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Re: AirFiber Receive Sensitivity / Modulation Specs

Hi guys,
I know a few of you were looking for these, here are some preliminary specs based on our tests. Once these figures are finalized, they'll be added to the spec sheet:

100MHz Chan Sensitivity FDD Capacity TDD Capacity
64QAM -66 1500 760
16QAM -72 1000 507
QPSK MIMO -78 500 253
QPSK SISO -80 250 127


-Matt


I was one of those *****ing to you about not having these numbers so let me be one of those saying thanks now that you've gotten them to us.

Seriously, thanks, Matt!!

Jake
I don't know enough about anything to have credibility on this forum so no matter how awesome something I say might sound, don't hit the like button, I beg you!:icon_redface:
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UBNT-Matt
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Re: AirFiber Receive Sensitivity / Modulation Specs

FDD = two channels, TDD = one channel

I'm assuming.


This is correct.

FDD = 2 100MHz channels (one tx, one rx)
TDD = 1 100MHz channel (tx/rx share same frequency)

Sorry if there were confusions, this is not official marketing material, I just posted it here to answer questions.

We'll make it more clear in the datasheets once finalized. :icon_smile:

-Matt
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walrus0
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Re: AirFiber Receive Sensitivity / Modulation Specs

okay, so in TDD mode if we have one 100MHz channel at 64QAM, and its capacity is 760Mbps...
the max speed in one direction (for example a unidirectional iperf test with large window size) would be 380Mbps?
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ekkabristow
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Re: AirFiber Receive Sensitivity / Modulation Specs

In TDD mode the radio should able to push 760Mbps (in lab) in any one direction at any one time. In both directions it will push 760Mbps as an aggregate (380Mbps in both directions).
TDD is a Full Duplex emulator in that it's transmitting and receiving only on a single frequency rather than two (Tx & Rx). It cannot do this without having a time guard as opposed to a guard band with FDD.
It's emulating Full Duplex more than Half Duplex in the respect of rather than waiting for (A) end to finish transmitting before you (B) end can talk (walkie talkie communication) it's happening (as close as possible - time guard) at the same time.
The end result of throughput is actually half of that of Full Duplex. It's just trying to emulate FD communication.
Hope this makes sense?
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mmaronta
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Re: AirFiber Receive Sensitivity / Modulation Specs

Matt. Your EIRP is listed as the FCC Maximum -33dbm. Can you give us the Radio output, feed horn loss and Tx Antenna diameter and gain, dbi? Also your posting shows RSL at -66 dbm @ 64 QAM and -72dbm @ 16 QAM. I assume thats at the receiver? Can you give us the Rx Antenna Diameter, Gain and feed horn loss so we can do a good path loss analysis? This is an interesting concept, I like it!

Thanks
Mike
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twinkletoes
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Re: AirFiber Receive Sensitivity / Modulation Specs

Just, why is TDD less capacity than FDD? is it correct - full duplex is faster than TDD?? Then, what is the benefit of less bandwith of TDD? Or I´m missing somethink... ?


You're missing somethink. Think about spectrum utilization.
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