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e-business: Hello to new phonelink generation.

NTT DoCoMo - Japan's top mobile phone operator - says it has successfully completed a transmission experiment for fourth-generation (4G) mobile communications.

The experiment involved a downlink - a signal sent from a satellite to Earth - of 100 megabits per second (Mbps) and an uplink of 20 Mbps.

That compares with top of the line ADSL (asymmetric digital subscriber line) services offering high-speed broadband Internet connections of about 12 Mbps.

The experimental 4G mobile communications service has the potential to offer high-speed transmission of large-capacity data, dwarfing the thirdgeneration (3G) data rate of two Mbps and allowing for multimedia services such as teleconferencing.

However, since 4G employs such a broad bandwidth, the service often loses the necessary transmission quality as secondary signals bounce off surrounding objects .

The company's experimental 4G mobile communications system employs variable spreading factor (VSF) and orthogonal frequency code division multiplexing (OFCDM) technologies to mitigate the impact of severe multipath interference.
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Title Annotation:Business
Publication:The Birmingham Post (England)
Date:Oct 15, 2002
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