Abstract
A radio-frequency receiver employing antenna diversity is provided with a plurality of antennas 11 13 and a local oscillator 33. Individual error signals are derived from each of respective ones of signals received from the plurality of antennas. The error signals are thereafter combined at 29 in such a way as to arrive at a combined error signal having greater reliability than any one of the individual error signals taken alone. Finally an automatic frequency control circuit 31 is controlled using the combined error signal. Since the effect of fading on the input signal to the automatic frequency control circuit is reduced performance of the automatic frequency control circuit is increased and the quality of radio reception is improved. The received signal may be modulated by digital data e.g. differential phase shift keying and the circuit 23 also produces the detected data. <IMAGE>
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Claim
1. In a radio-frequency receiver employing antenna diversity and having a plurality of antennas and a local oscillator, a method of automatic frequency control, comprising the steps of:', 'estimating phase errors in respective ones of signals received at respective ones of said plurality of antennas; forming a weighted sum of said phase errors; and controlling frequency of said signal produced by said local oscillator based on said weighted sum.
2. The method of claim 1 wherein said forming a weighted sum comprises arriving at a measure of the reliability of each of said signals received at said plurality of antennas and applying a larger weight to one is of said signals having greater reliability and applying a smaller weight to one of said signals having lesser reliability.
3. The method of claim 2, wherein signal strength is used as a measure of reliability.
4. The method of claim 2, wherein signal energy is used as a measure of reliability.
5. The method of claim 2 wherein signal quality is used as a measure of reliability.
6. In a radio-frequency receiver employing antenna diversity and having a plurality of antennas and a local oscillator, an automatic frequency control apparatus comprising:', 'means for estimating phase errors in respective ones of signals received at respective ones of said plurality of antennas; means for forming a weighted sum of said phase errors; and means for controlling frequency of said signal produced by said local oscillator based on said weighted SUM.
7. The apparatus of claim 6, wherein said means for forming a weighted sum comprises means for arriving at a measure of the reliability of each of said signals received at said plurality of antennas and means for applying a larger weight to one of said signals having greater reliability and applying a smaller weight to one of said signals having lesser reliability.
8. The apparatus of claim 7, wherein said means for arriving at a measure of the reliability of each of said is signals uses signal strength as a measure of reliability.
9. The method of claim 7, wherein said means for arriving at a measure of the reliability of each of said signals uses signal energy as a measure of reliability
10. The method of claim 7, wherein said means for arriving at a measure of the reliability of each of said signals uses signal quality as a measure of reliability
11. In a radio-frequency receiver employing antenna diversity and having a plurality of antennas and a local oscillator, a method of automatic frequency control, comprising the steps of: estimating an error quantity with respect to signals received from each of said plurality of antennas; arriving at a measure of reliability of each of said signals received at said plurality of antennas; forming a weighted sum of said error quantities by applying a larger weight to an error quantity of one of said signals having greater reliability and applying a 1 smaller weight to an error quantity of one of said signals having lesser reliability; and controlling a frequency of said signal produced by said local oscillator based on said weighted sum
12. A radio-frequency receiver employing automatic frequency control and antenna diversity and having a plurality of antennas and a local oscillator, comprising: means for estimating an error quantity with respect to a signal received at each of said plurality of antennas; means for arriving at a measure of reliability of each of said signals received at said plurality of antennas; means for forming a weighted sum of said error is quantities by applying a larger weight to an error quantity of one of said signals having greater reliability and applying a smaller weight to an error quantity of one of said signals having less reliability; and means for controlling a frequency of said signal produced by said local oscillator based on said weighted SUM
13. In a radio-frequency receiver employing antenna diversity and having a plurality of antennas and a local oscillator, a method of automatic frequency control. comprising the steps of: deriving individual error signals from each of signals received respectively at said plurality of antennas; combining said error signals in such a way as to arrive at a combined error signal having greater reliability than any one of said individual error signals taken alone; and controlling an automatic frequency control circuit using said combined error signal
14. A method of automatic frequency control, substantially as herein described with reference to the accompanying drawings
15. Automatic frequency control apparatus, substantially as herein described with reference to, and as shown in, the accompanying drawings.', '-1']
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SUMMARY
ClaimChart-GB2260454A-STO
Patent number:GB2260454A
Claim Chart Type : SEP Claim Chart
Price: 200 €
Note:
The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.