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US 5,710,995 AGranted
Adaptive antenna receiver
AssigneeFord Motor Company
InventorsYoshihiko Akaiwa, Mitsunori Morishima, Shunji Miyahara
Life of this patent
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Abstract
An FM radio receiver, particularly for mobile receivers, reduces the effects of multipath distortion. It selects either an adaptive process (constant modulus algorithm or CMA) or a antenna diversity process depending on the circumstances of the instantaneous reception. The receiver reduces both the decline of the level of received signals with the diversity process and waveform distortion with the CMA process.
Claims11
A radio receiver adapted to be coupled to at least two spaced-apart receiving antennas generating antenna signals in response to radio broadcast signals, said receiver comprising:
- a correction circuit for receiving said antenna signals and synthesizing a corrected signal as a weighted combination of said antenna signals;
- a diversity selecting circuit for receiving said antenna signals and generating a diversity signal corresponding to a selection of a best one of said antenna signals according to a diversity criterion;
- a signal quality monitor circuit coupled to said correction circuit and said diversity selecting circuit for measuring a predetermined quality of said corrected signal and said diversity signal;
- and
- a selection circuit for outputting either said corrected signal or said diversity signal in response to said measured predetermined quality.
2 more elements
Dependencies are inferred from the claim text.