| 摘要 |
PROBLEM TO BE SOLVED: To avoid the degradation in quality of an output signal by reducing the reduction in precision of weighting factor estimation at the time of separating a plurality of user signals. SOLUTION: A signal separation circuit 25 separates a user signal from a reception signal by using a weighting factor vector. When estimating the weighting factor vector, an unknown signal partial space estimation circuit 242 uses a known weighting factor vector to estimate an unknown signal partial space which has a channel response vector relating to the user signal to be separated by an unknown weighting factor vector, as a basis vector, and an unknown weight partial space estimation circuit 243 uses the unknown signal partial space to estimate an unknown weighting factor partial space having the unknown weighting factor vector as a basis vector. A blind weight estimation circuit 244 estimates the weighting factor vector based on blind processing on the basis of a restrictive condition defining that a weighting factor to be estimated exists in the unknown weighting factor partial space. COPYRIGHT: (C)2008,JPO&INPIT
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