I still do not have a 3G phone (because of the stupid pricing plans in Germany) and NTT DoCoMo already fools around with 4G networks.
NTT DoCoMo announced that they reached 1Gbps real-time packet transmission in the downlink at the moving speed of about 20km/h in a field experiment on fourth-generation (4G) radio access.
If you want to blow your mind read the sentence below taken from the press-release explaining the technology.
From the press-release:
"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."
More details in this NTT press-release.