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#430 – Shahriar Discusses 5G
Welcome back, Shahriar Shahramian from The Signal Path!
- Shahriar has been a guest on the show twice before
- Episode 228
- We posted the audio from Dave’s in-person interview with Shahriar
- 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
- OFDM
- QAM constellations
- 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