TOKYO, JAPAN, February 9, 2007 ---
After having achieved a maximum speed of 2.5Gbps on December 14, 2005, DoCoMo doubled the speed in the more recent test 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).
DoCoMo will present the details of the experiment at the 3GSM World Congress 2007 in Barcelona, Spain being held from February 12 to 15.
DoCoMo looks forward to contributing to the global standardization of 4G through its ongoing research and development.
*Multiple-Input Multiple-Output: Different data streams are spatially multiplexed using multiple antennas for both transmission and reception on the same frequency
- About NTT DoCoMo
NTT DoCoMois the world's leading mobile communications company. DoCoMo serves more than 52 million customers, including 32 million people subscribing to FOMA™, launched as the world's first 3G mobile service based on W-CDMAin 2001. DoCoMo also offers a wide variety of leading-edge mobile multimedia services, including i-mode™, the world's most popular mobile e-mail/Internet service, used by more than 47 million people. With the addition of credit-card and other e-wallet functions, DoCoMo mobile phones have become highly versatile tools for daily life. NTT DoCoMois listed on the Tokyo (9437), London (NDCM) and New York (DCM) stock exchanges. For more, visit www.docomo.ne.jp/english.