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Update : 2013.6.18 Tue 11:45
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WirelessHD ( http://www.wirelesshd.org ) is an initiative by several leading technology and consumer electronics companies to organize an industry-led standardization effort to define a next-generation wireless digital interface specification for consumer electronics and PC products.
Specifically, WirelessHD will emerge as a new, industry-led special interest group with the stated goal of enabling wireless connectivity for streaming HD content between source devices and high-definition displays.
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The WirelessHD specification defines a wireless protocol that enables consumer devices to create a wireless video area network (WVAN) with the following characteristics:
• Stream uncompressed audio and video at up to 1080p resolution, 24 bit color at
60 Hz refresh rates
• Deliver compressed A/V streams and data
• Advanced A/V and device control protocol
• Unlicensed operation at 60 GHz with a typical range of at least 10 m for highest
resolution HD A/V
• Smart antenna technology to enable non line of sight (NLOS) operation
• Data privacy for user generated content
The requirement for high data throughput at distances of 10 m necessitates a large allocated frequency spectrum. A large amount of spectrum is available on an unlicensed basis in many regulatory domains in the 60 GHz band.
In North America, South Korea and Japan, a total of 7 GHz is allocated for use, 5 GHz of which is overlapping. The band 57-64 GHz is allocated in North America and South Korea while 59-66 GHz is allocated in Japan. In addition, the European Union is in the process of creating similar allocations.
The regulations allow very high effective transmit power (the combination
of transmitter power and antenna gain), greater than 10 W of effective isotropic radiated power (EIRP). High EIRP and wide allocated bandwidth will allow high throughput connections that, however, are very directional.
The WirelessHD specification defines a novel wireless protocol that enables directional connections that adapt very rapidly to changes in the environment. This is accomplished by dynamically steering the antenna beam at the transmitter while at the same time focusing the receiver antenna in the direction of the incoming power from the transmitter.
This dynamic beam forming and beam steering not only optimizes the line-of-sight link, it allows the use of reflections and other indirect paths when the line-of-sight connection is lost. This summary document generally follows the order of the WirelessHD specification, revision 1.0.
The section headings are the same, i.e., section 5 of this document and the
WirelessHD specification both discuss the low rate physical layer (LRP). Subsection numbering, however, is not necessarily the same but does follow the same general order as in the WirelessHD specification.
For details, click http://www.wirelesshd.org/WirelessHD_Full_Overview_071009.pdfCopyright © Display Plus. All rights reserved. |
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