Patent ID: 6859484

Claim:
A transmission diversity detection circuit for notifying presence or absence of a transmission diversity of spread spectrum communication by modulation of SCH (Synchronization channel), comprising: arithmetic means for calculating a calculated value of C 2n,0 ×S 2n,0 *+C 2n,0 *×S 2n,0 +C 2n,1 *×C 2n,1 , in first and second symbols in a predetermined number of series of slots with respect to a reception signal, taking a primary CPICH (common pilot channel) symbol with respect to said first symbol as C 2n,0 , a SCH symbol with respect to said first symbol as S 2n,0 , a primary CPICH symbol with respect to said second symbol as C 2n,1 ; taking a complex conjugate of said primary CPICH symbol C 2n,0 as C 2n,0 *, a complex conjugate of SCH symbol S 2n,0 as S 2n,0 *, a complex conjugate of said primary CPICH symbol C 2n,1 as C 2n,1 *; and judgment means for making judgment whether transmission diversity is present or not depending upon positive or negative of said calculated value.