DS/CDMA receiver having an interference cancelling function capable of assuring a desired reception quality in a narrow-band DS/CDMA system

Claim 2

A DS/CDMA receiver characterized by: first through m-th receiving units (211, 221), each of which receives a DS/CDMA signal as a received signal, where m represents a plural number; first through m-th adaptive interference cancellers (212 + 213, 222 + 223) connected to said first through said m-th receiving units, respectively, each of said first through said m-th adaptive interference cancellers cancelling an interference on the received signal; single interference canceller control means (204) connected to said first through said m-th receiving units and connected to said first through said m-th adaptive interference cancellers for controlling said first through said m-th adaptive interference cancellers in common; and an all output combiner (201) connected to said first through said m-th adaptive interference cancellers for combining all of output signals of said first through said m-th adaptive interference cancellers.

Claim 3

A DS/CDMA receiver as claimed in claim 1 or 2, characterized in that each of said first through said m-th adaptive interference cancellers comprises an adaptive filter (112; 122; 212; 222) for cancelling said interference with respect to all other stations by adaptively making its tap coefficients orthogonal to spreading codes of said all other stations.

Claim 4

A DS/CDMA receiver as claimed in claim 1 or 2, characterized in that each of said first through said m-th adaptive interference cancellers comprises: an adaptive filter (112; 122; 212; 222) for cancelling said interference with respect to all other stations by adaptively making its tap coefficients orthogonal to spreading codes of said all other stations; and phase synchronizing means ( 507; 113; 123; 213; 223) for compensating for phase fluctuation of an output signal of said adaptive filter.

Claim 5

A DS/CDMA receiver as claimed in claim 2, 3, or 4, characterized in that said single interference canceller control means controls said first through said m-th adaptive interference cancellers in common on the basis of best quality control information relating to one of the received signals of said first through said m-th receiving units that has a best signal quality among the received signals of said first through said m-th receiving units.

Claim 6

A DS/CDMA receiver characterized by: first through m-th receiving units (311, 321), each of which receives a DS/CDMA signal as a received signal having a primary wave component and a secondary wave component following said primary wave component, where m represents a first plural number; first through m-th primary adaptive interference cancellers (313 n + 314 n , 323 n + 324 n ) connected to said first through said m-th receiving units, respectively, each of said first through said m-th primary adaptive interference cancellers cancelling an interference for the primary wave component of said received signal; first through m-th secondary adaptive interference cancellers (313₁ + 314₁, 323₁ + 324₁) connected to said first through said m-th receiving units, respectively, each of said first through said m-th secondary adaptive interference cancellers cancelling an interference for the secondary wave component of said received signal; first through m-th primary interference canceller control means (304 1n , 304 2n ) connected to said first through said m-th receiving units, respectively, and connected to said first through said m-th primary adaptive interference cancellers, respectively, for controlling said first through said m-th primary adaptive interference cancellers, respectively; first through m-th secondary interference canceller control means (304₁₁, 304₂₁) connected to said first through said m-th receiving units, respectively, and connected to said first through said m-th secondary adaptive interference cancellers, respectively, for controlling said first through said m-th secondary adaptive interference cancellers, respectively; and an all output combiner (301, 315, 325) connected to said first through said m-th primary adaptive interference cancellers and connected to said first through said m-th secondary adaptive interference cancellers for combining all of output signals of said first through said m-th primary adaptive interference cancellers and of said first through said m-th secondary adaptive interference cancellers.

Claim 7

A DS/CDMA receiver characterized by: first through m-th receiving units (411, 421), each of which receives a DS/CDMA signal as a received signal having a primary wave component and a secondary wave component following said primary wave component, where m represents a first plural number; first through m-th primary adaptive interference cancellers (413 n + 414 n , 423 n + 424 n ) connected to said first through said m-th receiving units, respectively, each of said first through said m-th primary adaptive interference cancellers cancelling an interference for the primary wave component of said received signal; first through m-th secondary adaptive interference cancellers (413₁ + 414₁, 423₁ + 424₁) connected to said first through said m-th receiving units, respectively, each of said first through said m-th secondary adaptive interference cancellers cancelling an interference for the secondary wave component of said received signal; single primary interference canceller control means (404 n ) connected to said first through said m-th receiving units and connected to said first through said m-th primary adaptive interference cancellers for controlling said first through said m-th primary adaptive interference cancellers in common; single secondary interference canceller control means (404₁) connected to said first through said m-th receiving units and connected to said first through said m-th secondary adaptive interference cancellers for controlling said first through said m-th secondary adaptive interference cancellers in common; and an all output combiner (401, 415, 425) connected to said first through said m-th primary adaptive interference cancellers and connected to said first through said m-th secondary adaptive interference cancellers for combining all of output signals of said first through said m-th primary adaptive interference cancellers and of said first through said m-th secondary adaptive interference cancellers.

Claim 8

A DS/CDMA receiver as claimed in claim 6 or 7, characterized in that each of said first through said m-th primary adaptive interference cancellers and said first through said m-th secondary adaptive interference cancellers comprises an adaptive filter (313 n ; 323 n ; 313₁; 323₁; 413 n ; 423 n ; 413₁; 423₁) for cancelling said interference with respect to all other stations by adaptively making its tap coefficients orthogonal to spreading codes of said all other stations.

Claim 9

A DS/CDMA receiver as claimed in claim 6 or 7, characterized in that each of said first through said m-th primary adaptive interference cancellers and said first through said m-th secondary adaptive interference cancellers comprises: an adaptive filter (313 n ; 323 n ; 313₁; 323₁; 413 n ; 423 n ; 413₁; 423₁) for cancelling said interference with respect to all other stations by adaptively making its tap coefficients orthogonal to spreading codes of said all other stations; and phase synchronizing means (507; 314 n ; 324 n ; 314₁; 324₁; 414 n ; 424 n ; 414₁; 424₁) for compensating for phase fluctuation of an output signal of said adaptive filter.

Claim 10

A DS/CDMA receiver as claimed in claim 7, 8, or 9, characterized in that: said single primary interference canceller control means controls said first through said m-th primary adaptive interference cancellers in common on the basis of primary wave best quality control information relating to one of the primary wave components of the received signals of said first through said m-th receiving units that has a best signal quality among the primary wave components of the received signals of said first through said m-th receiving units; said single secondary interference canceller control means controlling said first through said m-th secondary adaptive interference cancellers in common on the basis of secondary wave best quality control information relating to one of the secondary wave components of the received signals of said first through said m-th receiving units that has a best signal quality among the secondary wave components of the received signals of said first through said m-th receiving units.