Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.
NTT DoCoMo achieves 1Gbps in 4G field experiment
Posted on 23-Jun-2005 20:36. | Tags Filed under: News.



NTT DoCoMo, Inc. achieved 1Gbps real-time packet transmission in the downlink while moving at about 20km/h in a field experiment on 4G radio access. This is the latest achievement in DoCoMo's ongoing development of key radio access technology for 4G mobile communications.

The 1Gbps real-time packet transmission was realized through Variable Spreading Factor-Spread Orthogonal Frequency Division Multiplexing (VSF-Spread OFDM) radio access and 4-by-4 Multiple-Input-Multiple-Output (MIMO) multiplexing using "adaptive selection of surviving symbol replica candidate" (ASESS) based on Maximum Likelihood Detection with QR decomposition and the M-algorithm (QRM-MLD), which was developed by DoCoMo.

Frequency spectrum efficiency, which is expressed as information bits per second per Hertz, is 10 bits per second per Hertz, about 20 times that of 3G radio networks' spectrum efficiency.

During an earlier trial in July 2003, DoCoMo achieved 100Mbps and 20Mbps data rate transmission in the downlink and uplink, respectively, in outdoor environments using the same 100MHz bandwidth.

The company will continue to conduct field trials as part of its program to develop a 4G global standard in cooperation with the International Telecommunication Union Radiocommunication Sector. The telecommunications council of Japan's Ministry of Internal Affairs and Communications aims to see 4G services commercialized in the country by 2010.




comments powered by Disqus




Trending now »

Hot discussions in our forums right now:

The President Of The USA: Donald Trump
Created by TimA, last reply by Pumpedd on 18-Jan-2017 18:50 (1737 replies)
Pages... 114 115 116


New Unlimited Fixed Broadband
Created by LivingSkinny, last reply by hio77 on 18-Jan-2017 18:55 (53 replies)
Pages... 2 3 4


BP Ultimate Petrol (98) prices
Created by Satch, last reply by Jase2985 on 18-Jan-2017 20:59 (29 replies)
Pages... 2


Lost Mp3 collection, how to rebuild on the cheap (legally)?
Created by TeaLeaf, last reply by blakamin on 18-Jan-2017 20:53 (14 replies)

New Ford Mustang
Created by MikeB4, last reply by Inphinity on 18-Jan-2017 20:51 (14 replies)

Upsize my American houses to McMansion value deal.
Created by kingdragonfly, last reply by richms on 18-Jan-2017 15:48 (14 replies)

New fibre install and SunGenie power supply
Created by littleheaven, last reply by littleheaven on 16-Jan-2017 22:41 (14 replies)

Mountain Bike Recommendation
Created by networkn, last reply by joker97 on 15-Jan-2017 22:14 (14 replies)