NTT DoCoMo 4G test hits 1Gbps

Jun 23 2005 - 02:16 AM ET | Data, DoCoMo

Japan's NTT DoCoMo is busy testing 4G wireless technology (we're still using 2G here in the US) and has achieved a milestone, a 1Gbps data download speed while moving at 20km/h. 1Gbps while moving is a new record. The same speed while stationary has been reached by both Siemens and DoCoMo in the recent past. While 3G is a fairly broad term and is not even close to being standard yet, DoCoMo's research into 4G is still very interesting. bq. 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.

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