Antenna diversity receiver

Details Antenna diversity receiver Antenna diversity receiver

2007-11-27

2007-11-27

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

C455S324000, C375S349000

Reexamination Certificate

active

11051976

ABSTRACT:
An antenna diversity receiver comprises a zero-IF receiver connected to two antennas (102a, 102b) via switches (532, 534). Simultaneous measurement of signal qualities from both antennas is possible by routing signals from the first antenna (102a) via a first mixer (106) and channel filter (116) and routing signals from the second antenna (102b) via a second mixer (108) and channel filter (118). A diversity controller (536) compares the signal qualities received from the antennas (102a, 102b) during a data preamble to select a preferred antenna, then adjusts the switches (532, 534) to route the signals from the preferred antenna to both input mixers (106, 108). The amplifier (104a, 104b) connected to the deselected antenna may be switched off during data reception, thereby minimizing extra power consumption.Such an antenna diversity receiver enables effective antenna selection to be performed, even in systems such as Bluetooth where only a very short preamble is provided for receiver configuration.

REFERENCES:
patent: 5940452 (1999-08-01), Rich
patent: 6014571 (2000-01-01), Enoki
patent: 6018651 (2000-01-01), Bruckert et al.
patent: 6078796 (2000-06-01), Ling
patent: 6535721 (2003-03-01), Burke et al.
patent: 6563859 (2003-05-01), Oishi et al.
patent: 2003/0081656 (2003-05-01), Buehrer et al.

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