Variable interference cancellation technology for CDMA systems

A method for cancelling interference from a received baseband signal in a CDMA system, comprising:

• 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.

An interference-cancellation system configured for removing interference from a received baseband signal in a CDMA system, comprising:

• 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.

An apparatus configured to remove interference from a received baseband signal in a DCMA 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,
• 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−λss*, where I is an identity matrix, λ is a weight, and s is a CIV.

A method for cancelling interference from a received baseband signal in a CDMA system, comprising:

• 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−λss*, where I is an identity matrix, λ is a weight, and s is a CIV.

An interference-cancellation system configured for removing interference from a received baseband signal in a CDMA system, comprising:

• 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−λss*, where I is an identity matrix, λ is a weight, and s is a CIV.