Adaptive multiple-antenna systems with omni-directional and sector-directional antenna modes
First Claim
Patent Images
1. An apparatus comprising:
- a set of antennas, each antenna having an omni-directional mode and a sector-directional mode; and
a controller to switch each antenna in the set of antennas to its sector-directional mode based upon estimating a communication channel as having a first characteristic, and to switch each antenna in the set of antennas to its omni-directional mode based upon estimating the communication channel as having a second characteristic.
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Abstract
In a communication device compatible with either a SISO or MIMO access point, a set of antennas is configured as either sector-directional or omni-directional, depending upon whether the communication channel is characterized by the communication device as either strongly line of sight, or strongly scattering, respectively. In some embodiments, for the case in which a MIMO access point is utilized, the singular values of an estimated channel matrix are generated, and based upon the singular values, the characteristics of the communication channel is estimated. Other embodiments are described and claimed.
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Citations
29 Claims
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1. An apparatus comprising:
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a set of antennas, each antenna having an omni-directional mode and a sector-directional mode; and a controller to switch each antenna in the set of antennas to its sector-directional mode based upon estimating a communication channel as having a first characteristic, and to switch each antenna in the set of antennas to its omni-directional mode based upon estimating the communication channel as having a second characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An article of manufacture comprising a computer readable medium storing instructions thereon, which, when executed on a computer, cause the computer to, if a received signal indicates a multiple-input-multiple-output transmitter:
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estimate a channel matrix H of dimension m by n, where m>
1 and n>
1,perform a singular value decomposition of H to generate singular values of H; and configure a set of antennas as a set of omni-directional antennas or sector-directional antennas, depending upon the singular values. - View Dependent Claims (12, 13, 14)
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15. A method for a first device to communicate with a second device, the method comprising:
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determining at the second device whether the first device comprises a multiple-input-multiple-output transmitter; estimating at the second device the channel matrix to provide an estimated matrix H of dimension m by n, where m>
1, and n>
1 if the second device determines that the first device comprises a multiple-input-multiple-output transmitter, and n=1 otherwise; andif n>
1, performing a singular value decomposition of H so thatwhere σ
1≧
σ
2≧
. . . σ
min{m,n}≧
0 are the singular values of H, ui is the ith column of a m by m unitary matrix U, and viT is the ith row of a n by n unitary matrix V; andconfiguring each antenna in a set of antennas as either omni-directional or sector-directional, depending upon the singular values. - View Dependent Claims (16, 17, 18, 19)
and configuring each antenna in the set of antennas as sector-directional if the quotient is greater than a threshold.
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18. The method as set forth in claim 15, further comprising:
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if n=1, calculating E{hihj} for some i, where j ranges over the set of integers 1 through m, excluding i, where hk for k=1,2, . . . , m is the kth component of H, and E denotes a sample-data average; and configuring each antenna in the set of antennas as omni-directional or sector-directional depending upon the E{hihj}.
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19. The method as set forth in claim 18, further comprising:
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configuring each antenna in the set of antennas as sector-directional if where Λ
is a threshold.
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20. A system comprising:
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a set of antennas, each antenna having an omni-directional mode and a sector-directional mode; a processor; system memory in communication with the processor; a chipset in communication with the processor and the system memory; and a controller to switch each antenna in the set of antennas to its sector-directional mode based upon estimating a communication channel as having a first characteristic, and to switch each antenna in the set of antennas to its omni-directional mode based upon estimating the communication channel as having a second characteristic. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification