TeraHertz Transmitter Can Push 100Gbps+ Wireless Speeds Via a Single Channel (ispreview.co.uk)

Mark.JUK writes: A team of Japanese scientists working jointly for Hiroshima University and Panasonic have managed to develop a TeraHertz (THz) transmitter that is capable of transmitting digital data at a rate of 105 Gbps (gigabits per second) over a single channel using the frequency range from 290GHz to 315GHz. Previously it was only possible to achieve such speeds by harnessing multiple channels at the same time.

Professor Minoru Fujishima, Hiroshima University, said: "This year, we developed a transmitter with 10 times higher transmission power than the previous version's. This made the per-channel data rate above 100 Gbit/s at 300 GHz possible. We usually talk about wireless data rates in megabits per second or gigabits per second. But we are now approaching terabits per second using a plain simple single communication channel."

Comments

Define "channel"

[Solandri]

transmitting digital data at a rate of 105 Gbps (gigabits per second) over a single channel using the frequency range from 290GHz to 315GHz. Previously it was only possible to achieve such speeds by harnessing multiple channels at the same time.

Yeah, 290-315 GHz is a channel bandwidth of 25 GHz 802.11ac at 5 GHz has a channel bandwidth of up to 80 MHz (e.g channel 155 is 5735-5815 MHz).

Basically what they're doing is equivalent to "harnessing multiple channels at the same time." They've just elected to call their use of 312.5 80MHz bands a single channel, while if 802.11ac uses more than one 80 MHz band they're saying it's using multiple channels. Kinda like saying your road can only transport so many cars per lane, while my road can transport more cars in its "single" lane (which is 300x wider than your lanes, I just haven't painted lane stripes on it).

802.11ac can (with a single antenna) manage 433 Mbps over an 80 MHz channel, or 5.4 bps / Hz of bandwidth. 105 Gbps over 25 GHz is then 4.2 bps / Hz of bandwidth. Since there's no improvement in bps per Hz of bandwidth, basically you could get these results simply by scaling up existing technologies to higher frequencies and greater bandwidth. (Higher signal-to-noise ratio allows channel data rate to exceed frequency.)