Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Patent
1994-05-02
1996-03-12
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
455135, 4552772, 375347, H04B 116
Patent
active
054993970
ABSTRACT:
The present invention comprises a method and apparatus for selecting one of at least two antennas (202, 204) in a communication unit (200) for use in a wireless communication system (100). A signal is received by a radio frequency receiver during a receiving period from one of the at least two antennas (202, 204) currently selected by an antenna switch (206), the signal transmitted in a digital communications format comprising a plurality of bits. The quality of the receive signal is determined by a switch diversity algorithm programmed into a microcomputer (212) that bases the decision to switch antennas on predetermined thresholds established for each of: a received signal strength indicator, a phase error signal, and a recovered clock signal.
REFERENCES:
patent: 4584709 (1986-04-01), Kneisel et al.
patent: 4710957 (1987-12-01), Bocci et al.
patent: 5203023 (1993-04-01), Saito et al.
patent: 5203024 (1993-04-01), Yamao
ETSI, ETS 300 131 (prl), Jun. 1993, Second Edition, pp. 1-265.
Marko Paul D.
Wadin Craig P.
Doutre Barbara
Eisenzopf Reinhard J.
Motorola Inc.
Pham Chi H.
Rauch John G.
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