Adaptive diversity antenna system
First Claim
1. A method for using a arrangement of antennas to recover a modulated radio signal, comprising:
- identifying an electromagnetic scattering environment type as one of a set of electromagnetic scattering environment types;
selecting a best element combination from the arrangement of antennas based on the electromagnetic scattering environment type; and
combining radio signals intercepted by the best element combination, wherein the identifying of the electromagnetic scattering environment type comprises using a current set of correlation coefficient measurements made using a radio signal received at each best element combination of a set of element combinations.
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Accused Products
Abstract
An antenna system (205) includes an antenna structure (215), a receiver (220), and an antenna system controller (225). The antenna structure includes an arrangement of antennas (237), a signal combiner (240), and a switching matrix (235). The arrangement of antennas is designed to have a set of antenna element separations that are optimized to provide lowest correlation coefficients of intercepted radio signals for a corresponding set of electromagnetic environment types that vary from a very low density scattering environment to a maximum density scattering environment. The antennas (230), (231), (232), (233), (234) in the antenna arrangement each include at least one element that has a common polarization. There is at least one antenna that is a dual polarized antenna. The antenna system selects an antenna element pair that corresponds to the environment type which it is operating and thereby receives a best combined signal.
37 Citations
20 Claims
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1. A method for using a arrangement of antennas to recover a modulated radio signal, comprising:
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identifying an electromagnetic scattering environment type as one of a set of electromagnetic scattering environment types; selecting a best element combination from the arrangement of antennas based on the electromagnetic scattering environment type; and combining radio signals intercepted by the best element combination, wherein the identifying of the electromagnetic scattering environment type comprises using a current set of correlation coefficient measurements made using a radio signal received at each best element combination of a set of element combinations. - View Dependent Claims (2, 3, 4, 5)
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6. A method for using an arrangement of antennas to recover a modulated radio signal, comprising:
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measuring a set of correlation coefficients, each correlation coefficient determined using a radio signal intercepted at each element of a corresponding element combination having a first polarization orientation, each corresponding element combination formed from two elements in the arrangement of antennas; determining a lowest correlation coefficient of the set of correlation coefficients; and combining radio signals intercepted by the element combination corresponding to the lowest correlation coefficient when the lowest correlation coefficient has a value below a threshold value; and combining radio signals intercepted by two orthogonally oriented elements of the arrangement of antennas when the lowest correlation coefficient has a value above the threshold value.
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7. An antenna system, comprising:
- an antenna structure, comprising
an arrangement of antennas, each antenna comprising at least one element that has a common polarization, and at least one antenna that is a dual polarized antenna; a signal combiner that combines radio signals intercepted by an element combination into a combined radio signal; and a switching matrix that selects a best element combination of the arrangement of antennas; a signal receiver, coupled to the arrangement of antennas, that generates a demodulated signal from the combined radio signal; and an antenna system controller coupled to the signal receiver and antenna structure that selects the best element combination based on an electromagnetic scattering environment type identified from a set of electromagnetic scattering environment types. - View Dependent Claims (8, 9, 10, 11, 12, 13)
- an antenna structure, comprising
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14. An antenna system, comprising:
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an antenna structure, comprising an arrangement of antennas, each antenna comprising at least one element that has a common polarization, and at least one antenna that is a dual polarized antenna; a signal combiner that combines radio signals intercepted by an element combination into a combined radio signal; and a switching matrix that selects a best element combination of the arrangement of antennas; a signal receiver, coupled to the arrangement of antennas, that generates a demodulated signal from the combined radio signal; and an antenna system controller coupled to the signal receiver and antenna structure that selects the best element combination based on correlation coefficient measurements made using a radio signal received at each element combination of a set of element combinations. - View Dependent Claims (15, 16, 17, 18)
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19. A method for establishing an optimum diversity antenna arrangement for recovering a modulated radio signal that is intercepted by the diversity antenna arrangement, comprising:
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identifying a set of electromagnetic environment types that comprises distinct radio environments for a particular frequency range; determining a set of optimum antenna separations for the set of electromagnetic environment types, wherein each optimum antenna separation provides a minimum correlation coefficient; and establishing the optimum diversity antenna arrangement by determining an arrangement of antennas that provides a plurality of antenna separations determined from the set of optimum antenna separations and includes at least one dual polarized antenna. - View Dependent Claims (20)
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Specification