Character set for 11.2 version database in oracle for sql* loader

NLS_NCHAR_CHARACTERSET      AL16UTF16
NLS_LANGUAGE                AMERICAN
NLS_TERRITORY               AMERICA
NLS_CURRENCY                $
NLS_ISO_CURRENCY            AMERICA
NLS_NUMERIC_CHARACTERS      .,
NLS_CHARACTERSET            US7ASCII
NLS_CALENDAR                GREGORIAN
NLS_DATE_FORMAT             DD-MON-RR
NLS_DATE_LANGUAGE           AMERICAN
NLS_SORT                    BINARY
NLS_TIME_FORMAT             HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT        DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT          HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT     DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY           $
NLS_COMP                    BINARY
NLS_LENGTH_SEMANTICS        BYTE
NLS_NCHAR_CONV_EXCP         FALSE
NLS_RDBMS_VERSION           11.2.0.1.0

Above details are the client nls_database_parameters. I like to load the data with special characters through sql*loader.

I tried too many character sets mentioned in control file but data was loading like “?” only.
Please help me how to load special character in the client systems.