Variable interference cancellation technology for CDMA systems
First Claim
Patent Images
1. An apparatus configured to remove interference from a received baseband signal in a CDMA system, comprising:
- a composite interference vector (CIV) generator configured to produce at least one CIV by combing estimates of interference;
an interference-cancelling operator configured for generating a soft-projection operator,a soft-projection canceller configured for performing a soft projection operator, anda Rake receiver.
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Abstract
An interference canceller comprises a composite interference vector (CIV) generator configured to produce a CIV by combining soft and/or hard estimates of interference, an interference-cancelling operator configured for generating a soft-projection operator, and a soft-projection canceller configured for performing a soft projection of the received baseband signal to output an interference-cancelled signal. Weights used in the soft-projection operator are selected to maximize a post-processing SINR.
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Citations
32 Claims
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1. An apparatus configured to remove interference from a received baseband signal in a CDMA system, comprising:
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a composite interference vector (CIV) generator configured to produce at least one CIV by combing estimates of interference; an interference-cancelling operator configured for generating a soft-projection operator, a soft-projection canceller configured for performing a soft projection operator, and a Rake receiver. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for cancelling interference from a received baseband signal in a CDMA system, comprising:
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providing for generating at last one composite interference vector (CIV) by combining estimates from interfering subchannels, providing for generating a soft-projection operator, providing for performing a soft projection of the received baseband signal to output an interference-cancelled signal and wherein the estimates are derived from a Rake receiver. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An interference-cancellation system configured for removing interference from a received baseband signal in a CDMA system, comprising:
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a means for generating at least one composite interference vector (CIV) by combining estimates of interference, a means for generating a soft-projection operator, a means for performing a soft projection of the received baseband signal to output an interference-cancelled signal, and a means for generating the at least one CIV is configured to obtain the estimates from a Rake receiver. - View Dependent Claims (19, 20, 21, 22, 23)
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24. An apparatus configured to remove interference from a received baseband signal in a DCMA system, comprising:
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a composite interference vector (CIV) generator configured to produce at least one CIV by combing estimates of interference; an interference-cancelling operator configured for generating a soft-projection operator, a soft-projection canceller configured for performing a soft projection operator, a Rake receiver, and an interference-cancelling operator configured to generate a soft-projection matrix to operate on a received data vector, the soft-projection matrix having the form F(λ
)=I−
λ
ss*, where I is an identity matrix, λ
is a weight, and s is a CIV. - View Dependent Claims (25, 26)
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27. A method for cancelling interference from a received baseband signal in a CDMA system, comprising:
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providing for generating at last one composite interference vector (CIV) by combining estimates from interfering subchannels, providing for generating a soft-projection operator, providing for performing a soft projection of the received baseband signal to output an interference-cancelled signal, and wherein the estimates are derived from a Rake receiver, and wherein providing for generating the soft-projection operator is configured to generate a soft-projection matrix to operate on a received data vector, the soft-projection matrix having the form F(λ
)=I−
λ
ss*, where I is an identity matrix, λ
is a weight, and s is a CIV. - View Dependent Claims (28, 29)
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30. An interference-cancellation system configured for removing interference from a received baseband signal in a CDMA system, comprising:
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a means for generating at least one composite interference vector (CIV) by combining estimates of interference, a means for generating a soft-projection operator, a means for performing a soft projection of the received baseband signal to output an interference-cancelled signal, and a means for generating the at least one CIV is configured to obtain the estimates from a Rake receiver, and a means for generating the soft-projection operator is configured to generate a soft-projection matrix to operate on a received data vector, the soft-projection matrix having the form F(λ
)=I−
λ
ss*, where I is an identity matrix, λ
is a weight, and s is a CIV. - View Dependent Claims (31, 32)
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Specification