Antenna diversity receiver with variable switching delay time
AssigneeSiemens Aktiengesellschaft
InventorPieter Meijer
Life of this patent
Estimating the term…
Abstract
An antenna diversity receiver with a variable delay time for antenna switching is disclosed. The antenna diversity receiver includes an antenna selective switching means for coupling one of a plurality of antennas to a RF receiver input. A multipath detector controls the antenna selective switching means. A switching disabling means automatically disables the antenna selective switching means over a disabling period. In order to accurately immunize the receiver the disabling period is controlled by an adjacent channel detector to increase the period with increasing adjacent channel interferences and to decrease the period with descreasing channel interferences.
Claims19
An antenna diversity receiver comprising:
- an antenna selective switching means for selecting and coupling one of a plurality of antennas to a RF receiver input;
- a multipath detector for activating said antenna selective switching means to change over to another antenna at the occurrence of multipath interferences in the RF reception signal of said one antenna;
- switching disabling means for automatically disabling the antenna selective switching means to change antennas over a disabling period following each such change over from the occurrence of multipath interferences;
- and
- an adjacent channel detector for controlling said disabling period to increase the disabling period proportionally with increasing adjacent channel interferences.
An antenna diversity receiver comprising:
- a plurality of antennas;
- a RF receiver input;
- an antenna selective switch coupled to the plurality of antennas and the RF receiver, the switch selecting and coupling one of the plurality of antennas to the RF receiver input;
- a multipath detector coupled to the antenna selective switch and which activates the switch to change over to another antenna at the occurrence of multipath interferences in the RF reception signal of said one antenna;
- a switching disabling circuit which automatically disables the antenna selective switch from changing antennas over a disabling period following each change over at the occurrence of multipath interferences in the RF reception signal;
- and
- an adjacent channel detector which increases said disabling period proportionally with increasing adjacent channel interferences and decreases said disabling period proportionally with decreasing channel interferences.
Dependencies are inferred from the claim text.