Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Reexamination Certificate
2005-01-25
2005-01-25
Perez-Gutierrez, Rafael (Department: 2686)
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
C455S562100, C455S135000, C455S067130
Reexamination Certificate
active
06847810
ABSTRACT:
A system for selecting an antenna from a diversity of antennas in a DECT, PWT, or TDMA-based telecommunication system. The system combines multiple criteria to improve antenna diversity selections. The principal selection process is based on preamble diversity comparisons that operate in real-time. A preamble diversity switching circuit measures receive signal strength indicators (RSSI) from a plurality of antennas and selects the antenna that provides the highest RSSI value when the difference between the RSSI values exceeds a threshold. When the value of the RSSI difference falls below the threshold, the next selection process, a cyclical redundancy check (CRC) process is employed. The CRC process decodes a CRC value from a signal's content and compares it to a second threshold. If a CRC error is detected and the CRC value exceeds the second threshold, another antenna is selected. When the CRC value is below the prescribed threshold, the authority to select another antenna is transferred to the final selection process, a signal vector detection process (SVD). In the SVD process, the difference between a reference signal vector and a received signal vector is computed. If the function of the difference exceeds a third threshold, another antenna is selected. When the threshold is not met, diversity selections remain unchanged and control of the antenna selection process returns to the preamble diversity switching process. The SVD process may also be based on the gradient error vector which represents the magnitude of the received signal's rate of change.
REFERENCES:
patent: 5203024 (1993-04-01), Yamao
patent: 5446922 (1995-08-01), Siwiak et al.
patent: 5499397 (1996-03-01), Wadin et al.
patent: 5530926 (1996-06-01), Rozanski
patent: 5561673 (1996-10-01), Takai et al.
patent: 5799042 (1998-08-01), Xiao
patent: 5952963 (1999-09-01), Shen et al.
patent: 5960046 (1999-09-01), Morris et al.
patent: 5991613 (1999-11-01), Euscher et al.
patent: 6029057 (2000-02-01), Paatelma et al.
patent: 6032033 (2000-02-01), Morris et al.
patent: 6067449 (2000-05-01), Jager
patent: 6085076 (2000-07-01), Lindsay et al.
patent: 6483884 (2002-11-01), Shen et al.
patent: 20010055959 (2001-12-01), Shen et al.
patent: 9934533 (1999-07-01), None
patent: 9934534 (1999-07-01), None
patent: 9934535 (1999-07-01), None
Lenzo Michael
Shen Qun
Ericsson Inc.
Perez-Gutierrez Rafael
LandOfFree
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