NTT DoCoMo's 4G Tests Hit 300Mbps 259
haunebu writes "'Your brand-spankin'-new 3G phone is nearing obsolesence: NTT DoCoMo reveals the results from a new 4G test system.' says TheFeature. While in a car moving at 30kph, DoCoMo engineers managed a peak throughput of 300Mbps and a sustained transfer rate of 135Mbps with their new variable spreading factor orthogonal frequency code division multiplexing (WSF-OFCDM) downstream technology. Who comes up with these names, and how does Japan manage to stay lightyears ahead of everyone else in wireless?"
WSF-OFCDM? (Score:2, Interesting)
Concentration (Score:2, Interesting)
WiFi Anyone?? (Score:5, Interesting)
At a proposed sustained rate of 1G, this technology could revolutionize the Internet as we know it today. And, with more and more bandwidth readily available, there will be better multiplayer games online, as well as streaming on-demand cable-like tv off the Net.
I understand that the technology is proposed for gadgets such as a phone or wristwatch that can also watch HDTV - but imagine a world where everyone has a video-phone conference & everyone also has a 1G up/down broadband connection
In a word - WOW.
What are the power requirements? (Score:2, Interesting)
I guess the only mitigating factor is that you generally won't be using the 4G features with the phone pressed against your head....
Yes Yes.. (Score:3, Interesting)
Simple, they want the best, we want the values. (Score:5, Interesting)
In the US (live in US so cant say the same about other countries), yes people will buy the latest greatest, but will keep it for years, how many people do you know that have cellphones that are 2-3 years old.
People will only upgrade when their gadgets break, or a new technology comes out they really need. so new phones come out slower, and cheaper (cheap = break easy).
No point in rushing out the newest greatest items when people will allways wait.
Doppler (Score:3, Interesting)
Is speeding up like moving farther from your phone company's CO and using DSL? (slower speed)
The faster you are going means the Doppler effect is more pronounced. Wide Doppler ranges can be a pain to deal with in the receiver.
Density of wealth amongst populace (Score:5, Interesting)
This would explain why other densely populated counties, like Bangladesh, aren't riding high on the wagon.. it's because Japan is rich, has wealth more fairly disitributed, and has a dense population. Scandinavia also has its wealth more fairly spread between its citizens, and also boasts some of the world's most impressive mass technologies.
Re:How Japan is "lightyears" ahead of us... (Score:2, Interesting)
The country has large cities, but it has 4 large islands that are completely separate. Not to mention the tons of smaller islands and the extreme separation that the different cities have due to mountains.
I think the reason that Japan is light years ahead of us is probably due to the public's desire for this type of technology. Most Japanese use their cell phones for email and web surfing. They want and will pay for faster technology. People in the United States are... they won't.
Re:Your brand-spankin'-new 3G phone (Score:3, Interesting)
Re:their secret is... (Score:2, Interesting)
Basically, US mobile companies and slow, lazy, inefficient and technologically backwards. They don't want to invest in new technology because they don't have to because they jointly control the market as a monopoly and the cost of entering fresh with new technology is way way too high.
In Japan now, you can have cell phones with four way video conferencing, TV, GPS and a function where you use the phone as an electronic wallet at the store or with vending machines.
Other than finding new ways to explode things in ever more violent ways, the US is slipping behind the curve. I'm no liberal and have nothing against blasting terrorists, etc. but we're going to have to concentrate on other things as well to keep ahead.
DoS (Score:2, Interesting)
magic numbers? (Score:3, Interesting)
The frequency bandwidth[s] for the test [are] 100MHz..."
How do they get 3bits per cycle? Nyquist frequency limits mean 100MHz could optimally carry 50Mbps, not 6 times that in an actual test.
Channel size is the key (Score:2, Interesting)
What you really need to look for in radio technology is spectral efficiency or bits per hertz per second. When you do the math this isn't that great of a technology, it just uses big channels.