Method for reducing the effect of atmospheric ducting on wireless transmissions
First Claim
1. A method for reducing the effect of atmospheric ducting on wireless transmission said method comprising the steps of:
- transmitting a wireless beacon signal from each of a plurality of base stations in a wireless communication system to a plurality of other base stations in said system;
measuring a time delay and a propagation loss of each said wireless beacon signal;
comparing said time delay and propagation loss for each said wireless beacon signal to an expected time delay and propagation loss corresponding to said wireless beacon signal;
processing the results of said comparing step so as to determine a location of an atmospheric duct; and
arranging an antenna at each said base station corresponding to said location.
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Abstract
A method and system for reducing the effects of atmospheric ducting on wireless transmissions, wherein a wireless communication system is comprised of a plurality of base stations having antennas, each base station having a beacon signal transmitter and a beacon signal receiver. Each beacon signal transmitter is configured to transmit a wireless beacon signal to be received by the beacon signal receiver at other, preferably every other, base stations. For each wireless beacon signal, a time delay and a propagation loss is measured. Each measured time delay and propagation loss is compared to an expected time delay and an expected propagation loss corresponding to the wireless beacon signal. The results of the comparison are processed so as to determine a location of atmospheric ducts in the region serviced by the wireless system. Once an atmospheric duct has been located, the antennas of the base stations in the wireless system are arranged so as minimize the transmission of the wireless beacon signals through the duct location.
127 Citations
19 Claims
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1. A method for reducing the effect of atmospheric ducting on wireless transmission said method comprising the steps of:
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transmitting a wireless beacon signal from each of a plurality of base stations in a wireless communication system to a plurality of other base stations in said system;
measuring a time delay and a propagation loss of each said wireless beacon signal;
comparing said time delay and propagation loss for each said wireless beacon signal to an expected time delay and propagation loss corresponding to said wireless beacon signal;
processing the results of said comparing step so as to determine a location of an atmospheric duct; and
arranging an antenna at each said base station corresponding to said location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for reducing the effect of atmospheric ducting on wireless transmissions, said system comprising:
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a plurality of base stations having antennas, each said base station having a beacon signal transmitter and a beacon signal receiver, each said beacon signal transmitter configured to transmit a wireless beacon signal to be received by said beacon signal receiver at a plurality of other said base stations;
a time delay and propagation loss estimator, coupled to said beacon signal receiver and configured to measure a time delay and a propagation loss of each said wireless beacon signal;
an atmospheric model unit for storing an expected time delay and an expected propagation loss corresponding to each said wireless beacon signal;
a comparator, coupled to said time delay and propagation loss estimator and to said atmospheric model unit, said comparator configured to compare, for each said wireless beacon signal, said time delay and said propagation loss to said expected time delay and to said expected propagation loss corresponding to said wireless beacon signal;
a tomography unit, coupled to and configured to communicate with said comparator, said tomography unit further configured to process data received from said comparator and to determine a region wherein said atmospheric ducting is occuring; and
an antenna position unit, coupled to said tomography unit and configured to determine an arrangement of said antennas corresponding to said location. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification