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Figure 213 Over-the-horizon microwave systems
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Troposcatter microwave links have been applied in locations that are difficult to access, such as links connecting oil well islands with the mainland, links within deserts and jungles, and links for military communication (before the large-scale use of inexpensive satellite links) These links are operating in the 350 MHz to 6 GHz range within the bands allocated by the ITU The parameters of the radio channel require extremely high-gain antennas and transmitting powers, plus the application of multiple diversity systems such as frequency and space diversity, and angle and frequency diversity The capacity of the transmitted information is limited by propagation time differences over the scattering volume The siting of transmission links requires some care The antenna beams must not be obstructed by nearby objects and the antennas should be directed slightly above the horizon The precise optimum elevation is a function of the path and atmospheric conditions, but it lies within about 02 to 06 beamwidths above the horizon For radio paths extending only slightly over the horizon, or for paths extending over an obstacle or over mountainous terrain, diffraction will generally be the propagation mode determining the field strength In these cases, the methods described in Recommendation ITU-R P526 should be applied Generally speaking, over-the-horizon loss (OHLOSS) depends on the diffraction loss and tropospheric scatter loss, which are combined and then adjusted for regional geographic effects Time variability is added to that value to account for the percentage of time that these losses are exceeded In addition to the more commonly used over-the-horizon microwave point-to-point systems based on tropospheric scattering, there are other point-to-point systems based on stratosphere platform systems (HAP) and systems utilizing meteorite tails (ITU-R P843) that cannot be called microwave, since they operate in much lower frequency bands
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252 Point-to-Multipoint Systems
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The legacy telecom networks were designed for the delivery of voice services only As the demand for Internet and data traffic has increased, the access portion of the network has been unable to achieve the desired speeds because of limitations in the deployed technology Copper wires, for example, over typical distances to residences are limited to speeds of about a few hundreds kbps using xDSL modems because of the quality of the copper in the ground and cross-connections in the typical local loop On the other hand, the wireless broadband point-to-multipoint telecommunications platform facilitates the two-way transmission of voice, data, and video The systems typically operate in different frequency
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bands (some licensed and some license-exempt,) which, coupled with a high bandwidth capability in excess of 1 GHz, allows the communication of multimedia services with interactive facilities within a 3 mi (5 km) radius of a central data hub For the point-to-multipoint (PMP) architecture, the operator installs base stations around the market area that are very similar to traditional cellular systems,9 and each cell contains a hub with multiple radio nodes equipped with sector antennas for PMP and directional antennas for PP connections Base stations have antennas that transmit and receive on multiple sectors, and typical configuration is four sectors using 90 beamwidth antennas The subscribers use antennas that are installed on their rooftops, pointing in the direction of the maximum signal strength from the base station Similar to cellular system, frequencies are reused in neighbor base stations or sectors, as long as the reuse distances are defined so as to avoid interference These systems provide the bandwidth on demand, which is achieved by use of ATM or IP/Ethernet (and statistical multiplexing) as a transport mechanism Since the bandwidth is shared with other users, bandwidth available per subscriber is reduced with every new subscriber using the system For subscribers who demand fixed bandwidth availability, a point-topoint system can be offered that will not share bandwidth with other subscribers Figure 214 shows a typical system architecture based on the dynamic bandwidth allocation and ATM
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