Systems and Methods for Improving Antenna Isolation Using Signal Cancellation
First Claim
1. A system for providing interference isolation between a first antenna and a second antenna, comprising:
- an input operable to electrically couple to a signal transmission path of the first antenna to receive samples of signals for transmission by the first antenna;
an interference compensation circuit comprising;
a noise cancellation device electrically coupled to the input to receive the samples and to produce an interference compensation signal based on the samples, the interference compensation signal operable to suppress at least a portion of interference imposed on the second antenna by transmissions on the first antenna; and
a controller communicably coupled to the noise cancellation device and operable to determine an interference compensation setting for the noise cancellation device, the interference compensation setting comprising an in-phase parameter and a quadrature parameter for producing the interference compensation signal; and
an output operable to electrically couple between the noise cancellation device and a signal receiving path that connects the second antenna to a receiver, the output operable to couple the interference compensation signal to the signal receiving path.
1 Assignment
0 Petitions
Accused Products
Abstract
Interference compensation circuits can isolate a victim antenna from an aggressor antenna, which causes the antennas to appear as being spaced further apart. The interference compensation circuit can obtain samples of signals generated by a transmitter for transmission by the aggressor antenna and process the samples to generate an interference compensation signal. The generated interference compensation signal can be applied to a signal path between the victim antenna and a receiver to suppress, cancel, or otherwise compensate for interference imposed on the victim antenna by the signals transmitted from the aggressor antenna. The interference compensation signal is generated by adjusting at least one of amplitude, phase, and delay of the samples to emulate the interference imposed on the victim antenna.
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Citations
26 Claims
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1. A system for providing interference isolation between a first antenna and a second antenna, comprising:
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an input operable to electrically couple to a signal transmission path of the first antenna to receive samples of signals for transmission by the first antenna; an interference compensation circuit comprising; a noise cancellation device electrically coupled to the input to receive the samples and to produce an interference compensation signal based on the samples, the interference compensation signal operable to suppress at least a portion of interference imposed on the second antenna by transmissions on the first antenna; and a controller communicably coupled to the noise cancellation device and operable to determine an interference compensation setting for the noise cancellation device, the interference compensation setting comprising an in-phase parameter and a quadrature parameter for producing the interference compensation signal; and an output operable to electrically couple between the noise cancellation device and a signal receiving path that connects the second antenna to a receiver, the output operable to couple the interference compensation signal to the signal receiving path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for isolating a first antenna from interference imposed by a second antenna, the method comprising:
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obtaining at least one sample of a signal transmitted along a transmit signal path of the second antenna; generating an interference compensation signal by adjusting at least one of amplitude, phase, and delay of the sample based on an in-phase parameter and a quadrature parameter; applying the interference compensation signal to a receive signal path that electrically couples the first antenna to a receiver; and in response to applying the interference compensation signal to the receive signal path, suppressing at least a portion of the interference. - View Dependent Claims (16, 17, 18, 19)
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20. A wireless repeater, comprising:
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a first antenna; a first transmitter for transmitting signals via the first antenna; a first receiver for receiving signals via the first antenna; a second antenna; a second transmitter for transmitting signals via the second antenna; a second receiver for receiving signals via the second antenna; a first coupling device operable to obtain samples of the signals transmitted by the second transmitter; a second coupling device operable to couple an interference compensation signal to a receive signal path that couples the first antenna to the first receiver; a first interference suppression device for isolating the first receiver from interference imposed on the first antenna by the signals transmitted on the second antenna, the first interference device comprising; a first input for receiving the samples of the signals transmitted by the second transmitter; a first interference compensation circuit operable to generate the interference compensation signal by adjusting at least one of amplitude, phase, and delay of the samples based on an in-phase parameter and a quadrature parameter, the interference compensation signal operable to suppress at least a portion of the interference imposed on the first antenna; and a first output for passing the interference compensation signal to the second coupling device. - View Dependent Claims (21, 22, 23, 24)
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25. A cellular telephone network, comprising:
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a base station; and at least one wireless repeater, each wireless repeater comprising; a first transceiver for communication signals with the base station via a first antenna; a second transceiver for communicating signals with one or more cellular telephones via a second antenna; a first coupling device operable to obtain samples of signals transmitted on the first antenna; a second coupling device operable to couple an interference compensation signal to a receive signal path that couples the second antenna to the second transceiver; and a first interference suppression device for isolating the second transceiver from interference imposed on the second antenna by the signals transmitted on the first antenna, the first interference device comprising; a first input for receiving the samples of the signals transmitted on the first antenna; a first interference compensation circuit operable to generate the interference compensation signal by adjusting at least one of amplitude, phase, and delay of the samples based on an in-phase parameter and a quadrature parameter, the interference compensation signal operable to suppress at least a portion of the interference imposed on the second antenna; and a first output for passing the interference compensation signal to the second coupling device. - View Dependent Claims (26)
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Specification