INTERFERENCE CANCELLATION IN A SIGNAL
First Claim
1. A communication system having a forward link comprising:
- a base station which transmits multiple radio frequency (RF) signals; and
at least one mobile station, said mobile station including;
a receiver for receiving said RF signals;
means for converting said RF signal to an intermediate frequency (IF) signal;
means for sampling said IF analog signal to generate a digital IF signal, said digital signal having a data component and an interference component;
means for canceling co-channel interference in said digital signal by projecting said digital signal onto a subspace orthogonal to a subspace of said interference component and multiplying this projection with said digital signal; and
means for acquisition and tracking of said projected digital signal.
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Accused Products
Abstract
According to a first broad aspect of the present invention, there is provided a novel communication system having a forward link comprising: at least one base station which transmits multiple radio frequency (RF) signals; and a mobile station, the mobile station including: a receiver for receiving the RF signals; means for converting the RF signal to an intermediate frequency (IF) signal; means for sampling the IF signal to generate a digital signal, the digital signal having a data component and an interference component; means for canceling co-channel and or cross-channel interference in the digital signal by projecting the IF signal into a subspace orthogonal to a subspace of the interference component and multiplying this projection with the digital signal; and means for acquisition and tracking of the digital signal.
According to a second broad aspect of the present invention, there is provided a novel communication system having a reverse link comprising: at least one mobile station which transmits radio frequency (RF) signals; and a base station, the base station including: a receiver for receiving the RF signals; means for converting the RF signal to an intermediate frequency (IF) signal; means for sampling the IF signal to generate a digital signal, the digital signal having a data component and an interference component; means for canceling co-channel and or cross-channel interference in the digital signal by projecting the IF signal into a subspace orthogonal to a subspace of the interference component and multiplying this projection with the digital signal; and means for acquisition and tracking of the digital signal.
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Citations
72 Claims
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1. A communication system having a forward link comprising:
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a base station which transmits multiple radio frequency (RF) signals; and
at least one mobile station, said mobile station including;
a receiver for receiving said RF signals;
means for converting said RF signal to an intermediate frequency (IF) signal;
means for sampling said IF analog signal to generate a digital IF signal, said digital signal having a data component and an interference component;
means for canceling co-channel interference in said digital signal by projecting said digital signal onto a subspace orthogonal to a subspace of said interference component and multiplying this projection with said digital signal; and
means for acquisition and tracking of said projected digital signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A mobile station, said mobile station for receiving at least two radio frequency (RF) signals from the same source and comprising:
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a receiver for receiving said RF signals;
means for converting said RF signal to an intermediate frequency (IF) signal;
means for sampling said IF analog signal to generate a digital IF signal, said digital signal having a data component and an interference component;
means for canceling co-channel interference in said digital signal by projecting said digital signal onto a subspace orthogonal to a subspace of said interference component and multiplying this projection with said digital signal; and
means for acquisition and tracking of said projected digital signal. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for receiving signals in a receiver having at least one receiver circuit, the method comprising the steps of:
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receiving at least two radio frequency (RF) signals from the same source;
converting said RF signal to an intermediate frequency (IF) signal;
sampling said IF analog signal to generate a digital IF signal, said digital signal having a data component and an interference component; and
canceling co-channel interference in said digital signal by projecting said digital signal onto a subspace orthogonal to a subspace of said interference component and multiplying this projection with said digital signal. - View Dependent Claims (14, 15, 16)
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17. A communication system having a reverse link comprising:
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at least one mobile station which transmits radio frequency (RF) signals; and
at least one base station, said base station including;
a receiver for receiving at least two RF signals from said mobile station;
means for converting said RF signal to an intermediate frequency (IF) signal;
means for sampling said IF analog signal to generate a digital IF signal, said digital signal having a data component and an interference component;
means for canceling co-channel interference in said digital signal by projecting said digital signal onto a subspace orthogonal to a subspace of said interference component and multiplying this projection with said digital signal; and
means for acquisition and tracking of said projected digital signal. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A base station, said base station for receiving at least two radio frequency (RF) signals from the same source and comprising:
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a receiver for receiving said RF signals;
means for converting said RF signal to an intermediate frequency (IF) signal;
means for sampling said IF analog signal to generate a digital IF signal, said digital signal having a data component and an interference component;
means for canceling co-channel interference in said digital signal by projecting said digital signal onto a subspace orthogonal to a subspace of said interference component and multiplying this projection with said digital signal;
means for acquisition and tracking of said projected digital signal. - View Dependent Claims (24, 25, 26, 27, 28)
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29. A method for receiving signals in a receiver having at least one receiver circuit, the method comprising the steps of:
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receiving at least two radio frequency (RF) signals broadcast from one mobile receiver;
converting said RF signal to an intermediate frequency (IF) signal;
sampling said IF analog signal to generate a digital IF signal, said digital signal having a data component and an interference component; and
canceling co-channel interference in said digital signal by projecting said IF signal onto a subspace orthogonal to a subspace of said interference component and multiplying this projection with said digital signal. - View Dependent Claims (30, 31, 32)
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33. A communication system having a forward link comprising:
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at least one base station which transmits radio frequency (RF) signals; and
at least one mobile station, said mobile station including;
a receiver for receiving said RF signals;
means for converting said RF signal to an intermediate frequency (IF) signal;
means for sampling said IF analog signal to generate an IF digital signal, said digital signal having a data component and an interference component;
means for canceling cross-channel interference in said digital signal by projecting said digital signal onto a subspace orthogonal to a subspace of said interference component and multiplying this projection with said digital signal; and
means for acquisition and tracking of said projected digital signal. - View Dependent Claims (34, 35, 36, 37, 38)
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39. A mobile station, said mobile station for receiving a radio frequency (RF) signal and comprising:
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a receiver for receiving said RF signals;
means for converting said RF signal to an intermediate frequency (IF) signal;
means for sampling said IF analog signal to generate a digital IF signal, said digital signal having a data component and an interference component;
means for canceling cross-channel interference in said digital signal by projecting said digital signal onto a subspace orthogonal to a subspace of said interference component and multiplying this projection with said digital signal; and
means for acquisition and tracking of said projected digital signal. - View Dependent Claims (40, 41, 42, 43, 44)
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45. A method for receiving signals in a receiver having at least one receiver circuit, the method comprising the steps of:
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receiving at least one radio frequency (RF) signal;
converting said RF signal to an intermediate frequency (IF) signal;
sampling said IF analog signal to generate a digital IF signal, said digital signal having a data component and an interference component; and
canceling cross-channel interference in said digital signal by projecting said digital signal onto a subspace orthogonal to a subspace of said interference component and multiplying this projection with said digital signal. - View Dependent Claims (46, 47, 48, 49, 50)
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51. A communication system having a reverse link comprising:
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at least one mobile station which transmits radio frequency (RF) signals; and
at least one base station, said base station including;
a receiver for receiving said RF signals;
means for converting said RF signal to an intermediate frequency (IF) signal;
means for sampling said IF analog signal to generate a digital IF signal, said digital signal having a data component and an interference component;
means for canceling cross-channel interference in said digital signal by projecting said digital signal onto a subspace orthogonal to a subspace of said interference component and multiplying this projection with said digital signal; and
means for acquisition and tracking of said projected digital signal. - View Dependent Claims (52, 53, 54, 55, 56)
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57. A base station, said base station for receiving at least two radio frequency (RF) signals and comprising:
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a receiver for receiving said RF signals;
means for converting said RF signal to an intermediate frequency (IF) signal;
means for sampling said IF analog signal to generate a digital IF signal, said digital signal having a data component and an interference component;
means for canceling cross-channel interference in said digital signal by projecting said digital signal onto a subspace orthogonal to a subspace of said interference component and multiplying this projection with said digital signal; and
means for acquisition and tracking of said projected digital signal. - View Dependent Claims (58, 59, 60, 61, 62)
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63. A method for receiving signals in a receiver having at least one receiver circuit, the method comprising the steps of:
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receiving at least one radio frequency (RF) signal broadcast from at least one mobile receiver;
converting said RF signal to an intermediate frequency (IF) signal;
sampling said IF analog signal to generate a digital IF signal, said digital signal having a data component and an interference component; and
means for canceling cross-channel interference in said digital signal by projecting said digital signal onto a subspace orthogonal to a subspace of said interference component and multiplying this projection with said digital signal. - View Dependent Claims (64, 65, 66)
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67. A communication system having a forward link comprising:
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at least one base station which transmits multiple radio frequency (RF) signals; and
at least one mobile station, said mobile station including;
a receiver for receiving said RF signals;
means for converting said RF signal to an intermediate frequency (IF) signal;
means for sampling said IF analog signal to generate a digital IF signal, said digital signal having a data component and an interference component; and
means for canceling co-channel and cross-channel interference in said digital signal by projecting said digital signal onto a subspace orthogonal to a subspace of said interference component and multiplying this projection with said digital signal; and
means for acquisition and tracking of said projected digital signal. - View Dependent Claims (68, 69, 70, 71, 72)
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Specification