The present invention applies a single sideband modulation scheme to Directed Sequence Spread Spectrum (DSSS) / QPSK to obtain a frequency-doubling effect, and transmits a pilot signal in a mobile station as information to be transmitted, QPSK transmission / reception apparatus capable of enhancing the frequency efficiency by adopting the QPSK scheme in which differential encoding is applied by making it possible to perform the heurant detection.;The present invention is characterized in that a first exclusive OR device for exclusive ORing a 1 function generated in a first Walsh code generator and a code generated in a long code generator and a second exclusive OR device for outputting an output signal of the first exclusive OR device and data obtained from the source data part A third exclusive OR device for exclusive ORing the signal generated in the long code generator and the O function generated in the second Walsh code generator; and a third exclusive OR device for exclusive ORing the signal output from the third exclusive OR device A serial / parallel converter for converting the output signal of the second exclusive OR device into parallel data; a fourth exclusive OR circuit for exclusive ORing the signal output from the serial / parallel converter and the signal generated from the short code generator; The output signal of the fourth exclusive OR device and the output signal of the frequency divider are added A fifth exclusive OR device for exclusive-ORing the output signal of the short code generator with the signal output from the serial-to-parallel converter; and a fifth exclusive OR device for exclusive ORing the output signal of the fifth exclusive OR device with the output signal of the short-And a second adder for adding the output signal of the period to the second finite impulse response filter.
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