In-building microwave communication system permits frequency refuse with external point-to-point microwave systems
First Claim
1. A wireless radio frequency (RF) communication system disposed in a building having windows, operating on a first frequency which is also available for use by a different communications system located outside of the building, the in-building communications system comprising:
- a central module (CM) that includes an RF transmitter, RF receiver and antenna system;
a plurality of user modules (UM) each including an RF transmitter for transmitting signals to said CM receiver, an RF receiver for receiving signals from said CM transmitter, and an antenna system consisting of unidirectional antennas each having a predetermined horizontal pattern beamwidth and being oriented to provide substantially 360°
of total horizontal pattern coverage for each UM; and
switching means, coupled to the UM antenna system, for limiting the magnitude of RF signals exiting said building to a predetermined level, said predetermined level being below a transmit signal level for the different communication system by at least the capture ratio of the different communication system, to prevent interference to the different communications system located outside of the building.
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Accused Products
Abstract
A wireless in-building RF communications system operates within a building in a microwave frequency range which is also utilized by a point-to-point microwave communication system such that frequency reuse is provided. Central modules and user modules each consist of RF transceivers and antenna systems. The wireless communication system includes a mechanism for limiting magnitude of RF signals transmitted by it from exceeding a predetermined level sufficiently small to prevent interference with the point-to-point communications system.
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Citations
15 Claims
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1. A wireless radio frequency (RF) communication system disposed in a building having windows, operating on a first frequency which is also available for use by a different communications system located outside of the building, the in-building communications system comprising:
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a central module (CM) that includes an RF transmitter, RF receiver and antenna system; a plurality of user modules (UM) each including an RF transmitter for transmitting signals to said CM receiver, an RF receiver for receiving signals from said CM transmitter, and an antenna system consisting of unidirectional antennas each having a predetermined horizontal pattern beamwidth and being oriented to provide substantially 360°
of total horizontal pattern coverage for each UM; andswitching means, coupled to the UM antenna system, for limiting the magnitude of RF signals exiting said building to a predetermined level, said predetermined level being below a transmit signal level for the different communication system by at least the capture ratio of the different communication system, to prevent interference to the different communications system located outside of the building. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless radio frequency (RF) communication system, disposed in a building having external windows and operating on a first frequency within the 2-20 GHz range which is also available for use by a point-to-point microwave communications system located outside of the building, the in-building communications system comprising:
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a central module (CM) that includes an RF transmitter, RF receiver and antenna system; a plurality of user modules (UM) each including an RF transmitter for transmitting signals to said CM receiver, an RF receiver for receiving signals from said CM transmitter, and an antenna system consisting of a plurality of unidirectional antennas each having a predetermined horizontal pattern beamwidth; and means, coupled to the UM antenna system, for inhibiting certain UM antennae from being utilized, thereby limiting the magnitude of RF signals exiting said building to a predetermined level, said predetermined level being below a transmit signal level for the point-to-point communication system by at least the capture ratio of the point-to-point Communication system, to prevent interference to the point-to-point communications system. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification