#430 – Shahriar Discusses 5G


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Welcome back, Shahriar Shahramian from The Signal Path!

  • Shahriar has been a guest on the show twice before
  • Bell Labs bought by Nokia
  • Shahriar works at the Murray Hill campus
  • He is the head of the mmwave ASIC research group
  • Research group only has 8 people
  • Have multiple designs happening at once
  • Task switching between optical and RF chips
  • Software stuff at Bell Labs research is wide ranging
  • Moore’s law for RF
  • Going beyond the Marconi era: Doing phased array transmissions
  • Cramming more bits per hertz
  • Going from 4G to 5G requires going to higher frequencies
  • Transmitting GHz frequencies in all directions would blow the link budget
  • Would require Phased Arrays in order to transmit only power to reach individual devices
  • 256 transmitter and 128 receiver antennas in order to beamform
  • Beamforming in 5G will require line of sight
  • At 90 GHz (5G frequencies), the signal would not be able to pass through modern windows (because of the coating on the glass)
  • 5G will solve the latency issues that plagues 4G LTE
  • Link margin is how much above the absolute noise of the system are you
  • Types of modulation
  • Encoding based on the momentum of the polarization of the signal
  • Common mode modulation creating phantom channels
  • “The Fact That It Works Is Absolute Magic”
  • Bose Einstein Condensate Experiment
  • The dynamic range of peoples’ perspectives
  • “If you don’t teach people how to sort through information during the information age, then you have no idea how the world is going to turn out”
  • How to initiate a phased array connection
  • Why do you need so many antenna elements in receive mode?
  • Active denial system tested by the military
  • Shahriar bought a SiBEAM (now “Silicon Image”) 60 GHz phased array system that creates a wireless HDMI link off of eBay