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Great interview. At the start Dave kind of conflates 5G with millimeter wave 5G. The big difference between LTE networks and 5G networks is not the frequency r

Great interview. At the start Dave kind of conflates 5G with millimeter wave 5G. The big difference between LTE networks and 5G networks is not the frequency ranges used, low band 5G is perfectly feasible. The big difference is the linear increase in information capacity per antenna in MIMO (multiple in multiple out, many send many receive antenna) verses the logarithmic increase per antenna with single antenna to single antenna links. (while power his held constant) If you want to learn more this is a great intro to channel capacity with MIMO, http://complextoreal.com/wp-content/uploads/2013/01/mimo.pdf http://complextoreal.com/wp-content/uploads/2013/01/mimo.pdf

freyir 8y ago
Just to be clear, MIMO is not a new feature in 5G. LTE has MIMO. Old Wi-Fi routers from 10 years ago had MIMO. 5G is upping the number of antennas per base station. Theoretically, this allows a linear increase in capacity, but linear scaling is not always achievable in practice. The advantage of the higher frequency bands is the larger bandwidths available there. Conventional cellular bands typically have 5, 10, or 20 MHz bandwidth, sometimes 100 MHz. 5G's millimeter-wave bands support bandwidths up to 400 MHz. Information rate scales linearly with bandwidth. That said, there are many practical challenges to operating in the millimeter wave bands that might limit real-world performance.
- ksec 8y ago
  >MIMO is not a new feature in 5G Or Specifically Massive-MIMO, which is as you said upping the Antennas per base Station. LTE Massive MIMO actually already works in 3GPP Rel 13 for FDD, and Rel 7/ 8 for TDD. However 5G were specially designed with M-MIMO in mind, which brings higher efficiency than using in on LTE.