System and method for narrow beam antenna diversity in an RF data transmission system
DC CAFCFirst Claim
1. A method for providing antenna diversity for an RF data transmission system, said method comprising the steps of:
- monitoring frequencies, having a plurality of polarizations, used for RF data transmissions for optimal conditions for said RF data transmissions from a subscriber station transmitter; and
directing, in response to said conditions, said subscriber station transmitter to change a polarization of said transmissions.
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Accused Products
Abstract
A system and method providing narrow antenna beam polarity and/or angular diversity for subscriber stations in a point-to-multipoint RF data transmission system employs a subscriber multibeam antenna. Coangular pairs of antenna beams have orthogonal polarity and each pair is angularly diverse. The subscriber transceiver uses a plurality of inputs and at least one output. Polarization diversity for a subscriber is provided by employing one of the coangular pairs of antenna beams to receive corresponding polarization diverse signals from a hub. Angular diversity is provided by receiving transmissions on two angularly diverse beams from two hubs. At a hub the bit error rate of transmissions from a subscriber and/or signal levels of available frequencies with different polarizations are monitored and the optimal beam, frequency and polarization for transmissions from the subscriber are determined. Changes in frequency, beam or polarization for transmissions to the hub are communicated to the subscriber.
24 Citations
31 Claims
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1. A method for providing antenna diversity for an RF data transmission system, said method comprising the steps of:
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monitoring frequencies, having a plurality of polarizations, used for RF data transmissions for optimal conditions for said RF data transmissions from a subscriber station transmitter; and
directing, in response to said conditions, said subscriber station transmitter to change a polarization of said transmissions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
generating a plurality of antenna beams for use by said subscriber station transmitter and a subscriber station receiver, coangular pairs of said antenna beams comprising two beams having orthogonal polarity, each of said pairs being angularly diverse from others of said pairs;
receiving RF data transmissions using a plurality of said antenna beams;
routing signals received on said plurality of antenna beams to a plurality of subscriber receiver inputs; and
transmitting using said subscriber transmitter and at least one of said antenna beams and from at least one transmitter output.
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3. The method of claim 1 wherein said monitoring step includes monitoring a bit error rate of transmissions from said subscriber transmitter and said directing step is carried out in response to an increase in said bit error rate.
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4. The system of claim 1 wherein said monitoring step includes monitoring a signal level of transmissions on said frequencies.
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5. The method of claim 2 wherein said directing step includes the step of:
selecting at least one of said beams for data transmissions to and from said subscriber transmitter.
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6. The method of claim 2 wherein said monitoring step is carried out by at least one hub receiver, said hub receiver receiving data transmissions from said subscriber transmitter.
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7. The method of claim 6 wherein said subscriber receiver receives transmissions from at least one hub transmitter on a plurality of said antenna beams.
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8. The method of claim 6 wherein said subscriber receiver receives transmissions from said hub transmitter on one of said coangular pairs of said antenna beams.
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9. The method of claim 7 wherein said antenna beams are angularly diverse.
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10. The method of claim 9 wherein said transmissions from said at least one hub transmitter originate from separate ones of said hub transmitters.
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11. The method of claim 5 wherein said selecting step includes selecting a frequency and one of said coangular pairs of antenna beams.
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12. A diversity system for RF data transmissions, said system comprising:
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a multibeam antenna generating a first plurality of antenna beams, pairs of said first antenna beams having orthogonal polarization, each of said pairs being angularly diverse from others of said pairs;
a first receiver having a plurality of inputs receiving signals from at least two of said antenna beams;
a first transmitter having at least one output transmitting signals over at least one of said antenna beams;
means for monitoring RF data transmission frequencies, having a plurality of polarizations, for optimal conditions for said RF data transmissions; and
means, responsive to said conditions, for selecting at least one of said beams having one of said orthogonal polarizations for data transmissions from said first transmitter. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A narrow antenna beam diversity system for RF data transmissions, said system comprising:
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at least one subscriber station comprising;
a multibeam antenna generating a plurality of antenna beams, coangular pairs of said antenna beams comprising two beams having orthogonal polarity, each of said pairs being angularly diverse from others of said pairs;
a subscriber receiver, having a plurality of inputs receiving signals from a plurality of said antenna beams a subscriber transmitter having at least one output transmitting signals over at least one of said antenna beams;
at least one hub base station comprising;
at least one hub receiver receiving said transmitted signals from said subscriber transmitter at least one hub transmitter transmitting to said subscriber receiver for reception on a plurality of said antenna beams;
means for monitoring a plurality of frequencies, having a plurality of polarizations, used for RF data transmissions for optimal conditions for said RF data transmissions; and
,means, responsive to said conditions, for selecting at least one of said beams and polarizations for data transmissions to and from said subscriber transmitter. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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Specification