2007/02/12

DoCoMo's 4G Trial reached 5 Gbps

In future, what speed can a 4G base-station offer ?

According to the news sent to me by Telecom Asia, using a 100-MHz channel, the downlink speed was tested to be 5 Gbps. This high speed was aided by 12 sets of MIMO transmit and receive antennas and proprietary received signal processing technology.

For those working in the spectrum side, they will ask for spectral efficiency. This translates to 50 bps/Hz (5000 Mbps/100MHz).

Hey, wait a minute, how can we expect to have 12 receive antennas in end-user mobile devices. Where comes the 100 MHz spectrum, in what bands. Honestly speaking, users will be quite satsified if they could have 100 Mbps in full mobility at affordable price. There is still a long way to go.

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