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Type: Posts; User: carcarx

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    Looks like there's a 3 sector micro-site on a...

    Looks like there's a 3 sector micro-site on a pole between Iowa City Fencing and Harv's Auto Body!
    Clever design!
  2. Google Voice now available for Google Fi customers

    Years ago my Google Voice phone number became my Google FI phone number. I couldn't have both.

    Yesterday I saw a post on Engadget stating that Google Voice could now be obtained for us Google FI...
  3. Engadget added Sprint's response:...

    Engadget added Sprint's response:
    https://www.engadget.com/2019/09/24/fcc-says-sprint-made-false-lifeline-claims/
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    My wife's X4, while she was in Japan, acted...

    My wife's X4, while she was in Japan, acted temporarily as a WiFi hotspot for her.
    We could achieve a medium resolution Google Hangout using it, mid-morning in a far western suburb of Tokyo.
  5. 200 sq. miles represents an 8 mile radius circle.

    200 sq. miles represents an 8 mile radius circle.
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    http://www.radio-electronics.com/info/cellulartele...

    http://www.radio-electronics.com/info/cellulartelecomms/lte-long-term-evolution/voice-over-lte-volte.php
  7. License Assisted Access...

    License Assisted Access
    https://www.fiercewireless.com/wireless/editor-s-corner-laa-s-uptick-was-lte-u-worth-hassle

    and

    LAA is a 3GPP Release 13 technology ratified as part of LTE Advanced...
  8. "A town can be covered in fiber speed...

    "A town can be covered in fiber speed internet..."
    AT&T could claim that customers are getting 5G speed, but that's a bit of a misnomer: one can claim that there's 4G speeds anywhere where there's...
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    800 MHz isn't that effective as an ionizing...

    800 MHz isn't that effective as an ionizing frequency.

    Your friend might be interested in
    http://sss-mag.com/rfsafety.html#calc
    ...
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    cdma also takes advantage of multipath. Other...

    cdma also takes advantage of multipath. Other technologies have to fight it.
  11. What kind of scatterers and reflectors are...

    What kind of scatterers and reflectors are between you and the MIMO antennas? At 2.4 GHz the coherence length (based on the wavelength) would be just about 5 inches, so, without any reflections from...
  12. And cdma takes advantage of multipath, whereas...

    And cdma takes advantage of multipath, whereas LTE has to have extra hardware deployed to compensate for multipath.
  13. Thread: Wifi Calling?

    by carcarx
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    I've been saving lots of money with WiFi calling...

    I've been saving lots of money with WiFi calling from Republic Wireless. I have their first generation Moto X.
  14. Verizon agrees to $5 million settlement in rural call completion investigation

    http://transition.fcc.gov/Daily_Releases/Daily_Business/2015/db0126/DOC-331619A1.pdf
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    For those who can call/text via WiFi: We got a...

    For those who can call/text via WiFi:

    We got a mobile WiFi hot spot because our phones default to WiFi calling (Republic Wireless). The wife went to Japan before I did. I called her US number
    and...
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    Thanks for...

    Thanks for http://en.wikipedia.org/wiki/Multi-c...ultiple_access

    As I suspected cdma is reappearing in someone's 5G, multiple cdma carriers, each cdma carrier as a component of
    "OFDM" - rather...
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    Again, similar techniques for cdma would help...

    Again, similar techniques for cdma would help cdma networks more than rival the LTE performance.
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    His original orticle is: ...

    His original orticle is:

    http://www.radio-electronics.com/info/rf-technology-design/ofdm/ofdma-cdma.php

    OFDM CDMA comparison - interesting! I find the ISI comment puzzling because the chip rate...
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    If beamforming was allocated to cdma (both narrow...

    If beamforming was allocated to cdma (both narrow and wide) the capacity/sector could go very high, indeed! I think that would scale just fine.

    Another poster - no, mobiles can't beam form, due to...
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    Yes, direct sequence spread spectrum is another...

    Yes, direct sequence spread spectrum is another name for generic cdma, and using multipath is a feature from the beginning.

    With any FDM (frequency division multiplexing - akin to what you heard...
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    Doppler effect? No. Angle of arrival change,...

    Doppler effect? No. Angle of arrival change, inter and intra symbol interference.

    > MIMO not being in the books in Rel 7

    Here's something about the early struggles (published in 2011, not 2009)...
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    Channel estimation and angle of arrival...

    Channel estimation and angle of arrival (targeting the mobile via forming the beam) has trouble when there are reflections, especially when the mobile is moving, the faster it moves the worse the...
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    I'm referring specifically to inter- and...

    I'm referring specifically to inter- and intra-symbol interference. When the channel estimation from the training sequences can't compensate for the changed channel
    there's problems.
    ...
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    When radio bounces off structures the signals can...

    When radio bounces off structures the signals can be received via multiple paths (multi-path). If the distance between the reflections is just right the signals can cancel each other out, or...
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    Republic Wireless is a Sprint MVNO that offered...

    Republic Wireless is a Sprint MVNO that offered WiFi calling since its inception.
    I've happily been using my 2013 model Moto X. It's especially nice when a call to an overseas Republic Wireless...
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