The orthogonal code information includes a number and a length of the orthogonal code.

The first signal includes the first and second pilots, which first pilot and second pilot are respectively based on a first orthogonal code and a second orthogonal code.

An orthogonal code generator generates a noise power measurement orthogonal code, which is orthogonal to all the orthogonal codes presently being used by the mobile station.

An orthogonal code generation unit (101) selects an orthogonal code generated according to the rate information of the transmission signal.

The bit rate of the orthogonal code generated by the orthogonal code generation unit (101) is twice the maximum transmission rate of a transmission signal.

The present invention discloses a method for detecting the orthogonal code CDMA signal.

This ensures that used orthogonal code by terminal device of answering the paging does not conflict with other used orthogonal code by terminal device.

A correlator connected to the orthogonal code generator performs a correlation operation between the noise power measurement orthogonal code and the despread received signal.

The first vector matrix is permuted to provide an orthogonal code.

An orthogonal code is generated by a logic operation of an orthogonal code index which is converted into the binary number of the effective bit number and the sequentially generated chip count values.

The spread spectrum of the downlink channel information can use orthogonal-code.

It can be especially used in the device of orthogonal code CDMA system.

An orthogonal code set, the orthogonal code length is 2a, can be defined.

The orthogonal code length 2a is a least value larger than the codeword length L. A codeword having length L is generated by deleting 'c' predetermined symbols of the orthogonal code.

A second reception data string corresponding to the correct orthogonal code selected by the selection is obtained.