| 摘要 |
A transmission diversity detection system that detects the presence or absence of a STTD (Space-Time Transmit Diversity) transmission diversity by a simple arithmetic operation. The transmission diversity detection circuit notifies presence or absence of a transmission diversity of spread spectrum communication by modulation of a synchronization channel (SCH). The transmission diversity detection circuit includes arithmetic circuit for calculating a calculated value of C2n,0xS2n,0*+C2n,0*xS2n,0+C2n,1*xC2n,1, in first and second symbols in a predetermined number of series of slots with respect to a reception signal, taking a primary common pilot channel (CPICH) symbol with respect to the first symbol as C2n,0, a SCH symbol with respect to the first symbol as S2n,0, and a primary CPICH symbol with respect to the second symbol as C2n,1, taking a complex conjugate of the primary CPICH symbol C2n,0 as C2n,0*, a complex conjugate of SCH symbol S2n,0 as S2n,0*, and a complex conjugate of the primary CPICH symbol C2n,1 as C2n,1* and judgment circuit for making judgment whether transmission diversity is present or not depending upon positive or negative of the calculated value.
|
