Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2006-10-17
2006-10-17
Anderson, Matthew D. (Department: 2618)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S522000, C455S101000, C455S069000
Reexamination Certificate
active
07123942
ABSTRACT:
A base station having N transmission antennas (15) broadcasts M beacon signals (CPICH0, CPICH1), with 1<M<N. Each beacon signal is associated with a distribution vector (a, b) with N components and is applied to each of the antennas after weighting by a component of this vector. A mobile terminal in communication with the base station evaluates the reception of the M beacon signals so as to determine feedback data communicated to the base station. The latter causes the distribution vectors associated with the M beacons to vary over time, and processes the feedback data successively received so as to determine a respective weighting coefficient (w0−w3) for each of the N antennas relative to the mobile terminal. A transmitted dedicated radio signal destined for the mobile terminal is applied to each of the N transmission antennas after weighting by the coefficient determined for this antenna.
REFERENCES:
patent: 5886988 (1999-03-01), Yun et al.
patent: 6067324 (2000-05-01), Harrison
patent: 6842632 (2005-01-01), Raghothaman et al.
patent: 6853839 (2005-02-01), Usuda et al.
patent: 1 117 197 (2001-07-01), None
patent: WO 01 35548 (2001-05-01), None
Raghothaman et al., <<Transmit Adaptive Array Without User-Specific Pilot for 3G CDMA >>, IEEE, vol. 5 of 6, Jul. 2000, pp. 3009-3012.
<< 3rdGeneration Partnership Project; Technical Specification Group Radio Access Network; Physical Layer Procedures (FDD) (RELEASE 1999) >>, 3GPP TS 25.214, V3.6.0 (Mar. 2001).
<< 3rdGeneration Partnership Project; Technical Specification Group Radio Access Network; Physical Channels and Mapping of Transport Channels onto Physical Channels (FDD) (RELEASE 1999) >>, 3G TS 25.211, V3.3.0 (Jun. 2000).
Anderson Matthew D.
Nortel Networks Limited
Sobutka Philip J.
Trop Pruner & Hu P.C.
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