Transmission diversity detection circuit and detection method

1. 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.

2. A transmission diversity detection circuit as set forth in claim 1 , wherein said arithmetic means comprises:

circuits for deriving said complex conjugate C 2n,0 * of said primary CPICH symbol C 2n,0 , a complex conjugate S 2n,0 * of SCH symbol S 2n,0 , and a complex conjugate C 2n,1 * of said primary CPICH symbol C 2n,1 ;

multipliers calculating C 2n,0 ×S 2n,0 *, C 2n,0 *×S 2n,0 and C 2n,1 *×C 2n,1 ; and

an adder calculating a sum of C 2n,0 ×S 2n,0 *+C 2n,0 *×S 2n,0 +C 2n,1 *×C 2n,1 ,

said judgment means makes judgment whether transmission diversity is performed or not depending upon positive or negative of sign of said sum.

3. A transmission diversity detection circuit as set forth in claim 1 , wherein said predetermined slot is even numbered slots in one frame, said first and second symbols are (0)th and first symbols of said slot.

4. A transmission diversity detection circuit as set forth in claim 1 , wherein said arithmetic means performs arithmetic operation upon performing communication.

5. A transmission diversity detection circuit as set forth in claim 1 , wherein said arithmetic means performs arithmetic operation upon registration of position for communication.

6. A transmission diversity detection method for notifying presence or absence of a transmission diversity of spread spectrum communication by modulation of SCH (Synchronization channel), comprising:

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 , and a primary CPICH symbol with respect to said second symbol as C 2n,1 , and 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 *, and a complex conjugate of said primary CPICH symbol C 2n,1 as C 2n,1 *; and

judging whether transmission diversity is present or not depending upon positive or negative of said calculated value.

7. A transmission diversity detection method as set forth in claim 6 , wherein said calculating step comprises:

deriving said complex conjugate C 2n,0 * of said primary CPICH symbol C 2n,0 , a complex conjugate S 2n,0 * of SCH symbol S 2n,0 , and a complex conjugate C 2n,1 * of said primary CPICH symbol C 2n,1 ;

calculating C 2n,0 ×S 2n,0 *, C 2n,0 *×S 2n,0 and C 2n,1 *×C 2n,1 ; and

calculating a sum of C 2n,0 ×S 2n,0 *+C 2n,0 *×S 2n,0 +C 2n,1 *×C 2n,1 ,

said judging step judges whether transmission diversity is performed or not depending upon positive or negative of sign of said sum.

8. A transmission diversity detection method as set forth in claim 6 , wherein said predetermined slot is even numbered slots in one frame, said first and second symbols are (0)th and first symbols of said slot.

9. A storage medium storing a program implementing a transmission diversity detection method for notifying presence or absence of a transmission diversity of spread spectrum communication by modulation of SCH (Synchronization channel), said program comprising:

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 , and a primary CPICH symbol with respect to said second symbol as C 2n,1 , and 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 *, and a complex conjugate of said primary CPICH symbol C 2n,1 as C 2n,1 *; and

judging whether transmission diversity is present or not depending upon positive or negative of said calculated value.

10. A storage medium as set forth in claim 9 , wherein said calculating step comprises:

deriving said complex conjugate C 2n,0 * of said primary CPICH symbol C 2n,0 , a complex conjugate S 2n,0 * of SCH symbol S 2n,0 , a complex conjugate C 2n,1 * of said primary CPICH symbol C 2n,1 and a complex conjugate S 2n,1 * of said SCH symbol S 2n,1 ;

calculating C 2n,0 ×S 2n,0 *, C 2n,0 *×S 2n,0 and C 2n,1 *×C 2n,1 ; and

calculating a sum of C 2n,0 ×S 2n,0 *+C 2n,0 *×S 2n,0 +C 2n,1 *×C 2n,1 ,

said judging step judges whether transmission diversity is performed or not depending upon positive or negative of sign of said sum.

11. A storage medium as set forth in claim 9 , wherein said predetermined slot is even numbered slots in one frame, said first and second symbols are (0)th and first symbols of said slot.