Transmission diversity detection circuit and detection method

Details Transmission diversity detection circuit and detection method Transmission diversity detection circuit and detection method

2005-02-22

2005-02-22

Le, Amanda (Department: 2634)

Pulse or digital communications

Spread spectrum

C375S267000, C375S299000

Reexamination Certificate

active

06859484

ABSTRACT:
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,0×S2n,0*+C2n,0*×S2n,0+C2n,1*×C2n,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,0as C2n,0*, a complex conjugate of SCH symbol S2n,0as S2n,0*, and a complex conjugate of the primary CPICH symbol C2n,1as C2n,1* and judgment circuit for making judgment whether transmission diversity is present or not depending upon positive or negative of the calculated value.

REFERENCES:
patent: 5542107 (1996-07-01), Kay
patent: 5812935 (1998-09-01), Kay
patent: 20040018855 (2004-01-01), Wallace et al.
3GPP (3rdGeneration Partnership Project) specification TS25.211 V3.0.0, Oct., 1999, pp. 1-33.

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