DoCoMo outdoor 4G test successful Mobile Phones / NTT DoCoMo Posted by zmcnulty on Jun 23, 2005 - 05:30 PM |
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DoCoMo wastes no time bringing out the new technology, so they're already well into working on 4G (fourth-generation) transmission standards for the next generation of mobile phones. NTT DoCoMo, who is working towards the development of fourth-generation (4G) mobile phone systems, after acquiring a license to conduct outdoors tests, has successfully pulled a maximum 1Gbps downstream signal. This experiment represents a step towards successful application of 4G systems. Though the technologies to be used in 4G itself have not yet been standardized, NTT is already conducting 4G tests, and successfully pulled a 1Gbps downstream in indoor tests in December of last year. The transmission standards used in this experiment, like the indoors experiment, are "VSF-Spread OFDM (Variable Scattering Factor - Spread Orthogonal Frequency Division Multiple)," is can be flexibly adapted to various transmission environments, and "MIMO (Multiple-Input-Multiple-Output)," which transmits multiple signals using multiple antennas on the same frequency. DoCoMo explained, "the point is, we got the experimental license, and the outdoors experiment was a success." During this experiment, the frequency utilization ratio was about 10bps/Hz, which when compared to FOMA, represents about 20 times the efficiency during peak times.  Inspired by: http://k-tai.impress.co.jp/cda/article/news_toppage/24463.html [1] Press Release: http://www.nttdocomo.co.jp/new/contents/05/whatnew0623.html [2] |
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This article is from TechJapan http://www.techjapan.com/ The URL for this story is: http://www.techjapan.com/modules.php?op=modload&name=News&file=article&sid=1016 Links in this article [1] http://k-tai.impress.co.jp/cda/article/news_toppage/24463.html [2] http://www.nttdocomo.co.jp/new/contents/05/whatnew0623.html |