NTT DoCoMo announced Friday (9th Feb 07) that it achieved a maximum packet transmission rate of approximately 5Gbps in the downlink using 100MHz frequency bandwidth to a mobile station. .The field experiment of fourth-generation (4G) radio access took place in Yokosuka, Kanagawa Prefecture on December 25, 2006.
DoCoMo has already tested a maximum speed of 2.5Gbps on December 14, 2005.
The 5 Gbps speed was achieved by increasing the number of MIMO transmitting and receiving antennas from six to 12 each, and by using proprietary received signal processing technology.As compared with the December 14, 2005 test, the frequency spectrum efficiency, or the ratio of data transmission rate to channel bandwidth, was also doubled from 25bps/Hz to 50bps/Hz (5Gbps/100MHz).
The caveate as of now is that the test was done for mobile station moving only at speed fo 10km/h
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