Method and system for antenna interference cancellation
First Claim
1. A method for suppressing an interference signal imposed by a first antenna on a second antenna, comprising:
- sampling a transmitted signal on the first antenna;
processing the sampled signal according to a parameter to generate an estimate of the interference signal;
applying the estimate of the interference signal to the second antenna to suppress the interference signal; and
varying the parameter in response to monitoring the suppressed interference signal,wherein processing the sampled signal comprises filtering the sampled signal with a filter having a frequency response, and wherein varying the parameter comprises adjusting the frequency response.
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Accused Products
Abstract
A wireless communication system can comprise two or more antennas that interfere with one another via free space coupling, surface wave crosstalk, dielectric leakage, or other interference effect. The interference effect can produce an interference signal on one of the antennas. A cancellation device can suppress antenna interference by generating an estimate of the interference signal and subtracting the estimate from the interference signal. The cancellation device can generate the estimate based on sampling signals on an antenna that generates the interference or on an antenna that receives the interference. The cancellation device can comprise a model of the crosstalk effect. Transmitting test signals on the communication system can define or refine the model.
337 Citations
17 Claims
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1. A method for suppressing an interference signal imposed by a first antenna on a second antenna, comprising:
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sampling a transmitted signal on the first antenna; processing the sampled signal according to a parameter to generate an estimate of the interference signal; applying the estimate of the interference signal to the second antenna to suppress the interference signal; and varying the parameter in response to monitoring the suppressed interference signal, wherein processing the sampled signal comprises filtering the sampled signal with a filter having a frequency response, and wherein varying the parameter comprises adjusting the frequency response. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for suppressing an interference signal imposed by a first antenna on a second antenna, comprising:
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sampling a transmitted signal on the first antenna; processing the sampled signal according to a parameter to generate an estimate of the interference signal; applying the estimate of the interference signal to the second antenna to suppress the interference signal; varying the parameter in response to monitoring the suppressed interference signal; and transmitting, on the first antenna, a first test signal having a first frequency, a second test signal having a second frequency, and a communication signal having a third frequency, wherein the third frequency is between the first frequency and the second frequency, and wherein the sampling step comprises sampling the first transmitted test signal and sampling the second transmitted test signal.
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9. A method for reducing interference on an antenna system, comprising:
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transmitting a test signal on a first antenna; coupling a portion of the test signal from the first antenna to a second antenna via an interference effect; defining a model of the interference effect based on processing the test signal; responsive to transmitting a communication signal on the first antenna, coupling the interference onto the second antenna via the interference effect; outputting an estimate of the interference in response to processing the communication signal with the model; and applying the estimate to the second antenna to reduce the interference, wherein the model comprises a filter and wherein defining the model comprises adjusting the filter. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for reducing interference on an antenna system, comprising:
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transmitting a test signal on a first antenna; coupling a portion of the test signal from the first antenna to a second antenna via an interference effect; defining a model of the interference effect based on processing the test signal; responsive to transmitting a communication signal on the first antenna, coupling the interference onto the second antenna via the interference effect; outputting an estimate of the interference in response to processing the communication signal with the model; and applying the estimate to the second antenna to reduce the interference, wherein applying the estimate to the second antenna comprises subtracting the estimate from the interference and the portion of the test signal coupled to the second antenna via the crosstalk effect.
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16. A system, for canceling a signal coupled onto a dormant antenna by an active antenna, comprising:
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a first coupler, comprising a port that connects to a feed line of the dormant antenna, for feeding a sample of the signal to a signal processing circuit; and a second coupler comprising a port for feeding a cancellation signal to the feed line, wherein the signal processing circuit generates the cancellation signal based on amplifying and shifting the sampled signal, wherein the first coupler comprises a splitter and the second coupler comprises a summation node. - View Dependent Claims (17)
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Specification