osmartormenajr

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osmartormenajr
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  • Apple's satellite program aims to send data directly to an iPhone

    osmartormenajrosmartormenajr
    An iPhone communicating with a Low Earth Orbit (LEO) satellite isn't as far fetched as some previous comments would imply. Satellite communications operate over Line-of-Sight (LoS) which is way more simple and straightforward than the multipath fading we have to deal on cellular networks. A sizable chunk out of the transmit power budget in a cellular modem is spent over the multipath fading.

    I didn't run the math (although I could do it later), but I'm quite sure that for a LEO satellite (which can be as low as 220 miles, or 350 km), for a lower order modulation, like BPSK or QPSK, reliable data communications (Bit Error Rate—BER— as low as 1E–6) can be achieved within the current power envelope of an iPhone.

    As for the downlink vs. uplink theory, as a general rule, power availability is severely constrained in a satellite too. Not just because the size (and weight) of bigger solar panels, but mostly due to poor heat dissipation. Up there, the only heat dissipation phenomena available is irradiation, which is quite inefficient. You just can't run your electronics on many watts, or they'll simply burn up!
    appleinsideruserminicoffeebakedbananaswatto_cobracornchipbeowulfschmidt

  • Inside -- and outside -- the 2019 Mac Pro in pictures

    osmartormenajrosmartormenajr
    I’d very much like to know the manufacturer of the FPGA chip inside the Afterburner card?

    Major FPGA vendors, like Altera (Intel) and Xilinx, don’t support a Mac version of their VHDL tools. So either Apple has developed their own, with a less known supplier, or developed it without a Mac.
    radarthekatwatto_cobra

  • AMD details the 16-inch MacBook Pro's Radeon Pro 5000M-series GPUs

    osmartormenajrosmartormenajr
    No slouch... although I find it funny that Apple have chosen Matlab as one of the benchmarks for the new MBP. For years now, the only GPGPU that Matlab has supported is with NVidia cards through CUDA, which makes this excellent card from ATI quite useless (at least for that scenario).
    watto_cobra

  • Editorial: Mac Pro puts the pedal to Metal in Apple's race with Nvidia

    osmartormenajrosmartormenajr
    I’m keeping my fingers crossed for Mathworks Matlab to add support for GPGPU through Metal. Currently, they only support CUDA, and I have a lot o graphics power left on the table, while plowing through 5G simulations!
    watto_cobraOkiRun

  • Apple calls on developers to submit apps ahead of macOS Catalina release

    osmartormenajrosmartormenajr
    OutdoorAppDeveloper said:
    Why doesn't Apple release their own VM to run old 32 bit apps and to sandbox untrusted apps downloaded from the Internet?
    Because Apple doesn’t want to drag its heels over this transition any longer. The writing has been on the wall for years now.

    Best to just rip off the band-aid!
    Soliwatto_cobra