The portfolio of 900 IEEE Standards Association has increased today with a new one, the IEEE 802.22 wireless networks that can deploy with a coverage of 100 kilometers and speeds of 22 Mbps is known as super wifi and will provide network coverage in areas such as rural areas, where infrastructure is less common. To achieve this goal, the new system will use spectrum released by the transition from analog to digital television.
As explained in Bandanacha , networks operate on the model of point-to-multipoint, where several end-user computers are connected directly to the base station that will determine who has access to the medium at the time. "The modulation will be OFDMA, so the link data rate may be adapted to changing conditions of the wireless medium, lowering the pure performance of the link toward keeping the connection alive if they worsen, and vice versa."
The signal does not interfere with television since it uses so-called white spaces that do not take the television signal.
In the statement of partnership highlights the capabilities of the use of cognitive radio call, a wireless communication system capable of emitting, receiving and communicating with their peers at a time without causing interference, because it takes advantage of gaps in the spectrum. "The cognitive radio is a revolution in radio communications, because it changes the way we manage and use the radio spectrum," explains Ferran Casadevall, professor in the Department of Signal Theory and Communications Universitat Politècnica de Catalunya (UPC) , in a report by this newspaper on it. "Imagine a highway where each lane is for a type of vehicle. Cognitive radio, however, can assign them dynamically. Thus, in the band for television, for example, operate telephone services using the spectral holes. While the fixed channels prevents little or no use, but allocated to specific services, can be reused by others, the cognitive radio channel can be reused for more than one service.
As explained in Bandanacha , networks operate on the model of point-to-multipoint, where several end-user computers are connected directly to the base station that will determine who has access to the medium at the time. "The modulation will be OFDMA, so the link data rate may be adapted to changing conditions of the wireless medium, lowering the pure performance of the link toward keeping the connection alive if they worsen, and vice versa."
The signal does not interfere with television since it uses so-called white spaces that do not take the television signal.
In the statement of partnership highlights the capabilities of the use of cognitive radio call, a wireless communication system capable of emitting, receiving and communicating with their peers at a time without causing interference, because it takes advantage of gaps in the spectrum. "The cognitive radio is a revolution in radio communications, because it changes the way we manage and use the radio spectrum," explains Ferran Casadevall, professor in the Department of Signal Theory and Communications Universitat Politècnica de Catalunya (UPC) , in a report by this newspaper on it. "Imagine a highway where each lane is for a type of vehicle. Cognitive radio, however, can assign them dynamically. Thus, in the band for television, for example, operate telephone services using the spectral holes. While the fixed channels prevents little or no use, but allocated to specific services, can be reused by others, the cognitive radio channel can be reused for more than one service.
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