pugazh anand
Member • Aug 12, 2013
Millimetre Waves-The Future of Phones
5g Beam Scheme: Steerable millimetre-wave beams could enable multi-gigabit mobile connections.Phones at the edge of a 4G cell [blue] could use the beams to route signals around obstacles. Because the beams wouldn’t overlap, phones could use the same frequencies [pink] without interference. Phones near the 4G tower could connect directly to it [green] For one thing, these waves don’t penetrate solid materials very well. They also tend to lose more energy than do lower frequencies over long distances, because they are readily absorbed or scattered by gases, rain, and foliage. And because a single millimetre-wave antenna has a small aperture, it needs
more power to send and receive data than is practical for cellular systems. Samsung’s current prototype is a matchbook-size array of 64 antenna elements connected to custom-built
signal-processing components. By dynamically varying the signal phase at each antenna, this transceiver geneates a beam just 10 degrees wide that it can switch rapidly in any direction,
as if it were a hyperactive searchlight. Farooq Khan (Head of Samsung’s R&D centre at Dallas) and his colleagues Zhouyue Pi and Jianzhong Zhang filed the first patent describing a millimetrewave mobile broadband system in 2010. Although the prototype revealed this year is designed to work at 28
GHz, the Samsung engineers say their approach could be applied to most frequencies between about 3 and 300 GHz. In South Korea, a prototype transmitter was able to send data at more
than 1 GB/s to two receivers moving upto 8 kilometres per hour—about the speed of a fast jog.
Theodore Rappaport, a wireless expert at the Polytechnic Institute of NYU, has achieved similar results. His NYU Wireless lab, which has received funding from Samsung, is working to characterize the physical properties of millimetre wave channels. In recent experiments, he and his students simulated beam forming arrays using megaphone-like “horn†antennas to steer signals. After
measuring path losses between two horn transceivers placed in various configurations, they concluded that a base station operating at 28 or 38 GHz could provide consistent signal coverage up to about 200 meters. Millimetre-wave transceivers may not make useful replacements for current cellular base stations, which cover up to about a kilometre. The beauty of millimetre waves is there’s so much spectrum, we can now contemplate systems that use spectrum not only to connect basestations to mobile devices but also to link base stations to other base stations or back to the switch,†Rappaport says. “We can imagine a whole new cellular architectureâ€. The newly formed consortium of European companies and universities is working to identify the most promising 5G solutions by early2015.
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more power to send and receive data than is practical for cellular systems. Samsung’s current prototype is a matchbook-size array of 64 antenna elements connected to custom-built
signal-processing components. By dynamically varying the signal phase at each antenna, this transceiver geneates a beam just 10 degrees wide that it can switch rapidly in any direction,
as if it were a hyperactive searchlight. Farooq Khan (Head of Samsung’s R&D centre at Dallas) and his colleagues Zhouyue Pi and Jianzhong Zhang filed the first patent describing a millimetrewave mobile broadband system in 2010. Although the prototype revealed this year is designed to work at 28
GHz, the Samsung engineers say their approach could be applied to most frequencies between about 3 and 300 GHz. In South Korea, a prototype transmitter was able to send data at more
than 1 GB/s to two receivers moving upto 8 kilometres per hour—about the speed of a fast jog.
Theodore Rappaport, a wireless expert at the Polytechnic Institute of NYU, has achieved similar results. His NYU Wireless lab, which has received funding from Samsung, is working to characterize the physical properties of millimetre wave channels. In recent experiments, he and his students simulated beam forming arrays using megaphone-like “horn†antennas to steer signals. After
measuring path losses between two horn transceivers placed in various configurations, they concluded that a base station operating at 28 or 38 GHz could provide consistent signal coverage up to about 200 meters. Millimetre-wave transceivers may not make useful replacements for current cellular base stations, which cover up to about a kilometre. The beauty of millimetre waves is there’s so much spectrum, we can now contemplate systems that use spectrum not only to connect basestations to mobile devices but also to link base stations to other base stations or back to the switch,†Rappaport says. “We can imagine a whole new cellular architectureâ€. The newly formed consortium of European companies and universities is working to identify the most promising 5G solutions by early2015.
Source: #-Link-Snipped-#