Claims
- 1. A method of improving the performance of a receiver receiving a signaling stream on a carrier frequency from a transmitter in an environment wherein relative motion exists between the receiver and transmitter at a velocity and in a direction of movement, the method comprising the steps of:
determining the apparent angle between the receiver and transmitter relative to the direction of movement; using the apparent angle to produce time-delayed replicas of the received signaling stream; and coherently adding the time-delayed replicas of the signaling stream to synthesize an increased apparent receiver antenna aperture.
- 2. The method of claim 1, further including the steps of:
estimating a Doppler shift in the carrier frequency due to the relative motion; and determining the apparent angle as a function of the Doppler shift.
- 3. The method of claim 1, wherein the apparent angle is determined as a function of the time delay of the arrival of the signaling stream.
- 4. The method of claim 1, wherein the signaling stream is a spread spectrum signaling stream.
- 5. A method of improving the performance of a receiver receiving a signaling stream on a carrier frequency from a transmitter in an environment wherein relative motion exists between the receiver and transmitter at a velocity and in a direction of movement, the method comprising the steps of:
estimating a Doppler shift in the carrier frequency due to the relative motion; determining the apparent angle between the receiver and transmitter relative to the direction of movement as a function of the Doppler shift; using the apparent angle to produce time-delayed replicas of the received signaling stream; and coherently adding the time-delayed replicas of the signaling stream to synthesize an increased apparent receiver antenna aperture.
- 6. The method of claim 5, wherein the signaling stream is a spread spectrum signaling stream.
- 7. A method of improving the performance of a mobile cellular communications receiver receiving a signaling stream on a carrier frequency from a stationary transmitter, the method comprising the steps of:
determining the apparent angle between the mobile cellular receiver and the stationary transmitter as a function of the direction of movement of the receiver; using the apparent angle to produce time-delayed replicas of the received signaling stream; and coherently adding the time-delayed replicas of the signaling stream to synthesize an increased apparent receiver antenna aperture.
- 8. The method of claim 7, further including the steps of:
estimating a Doppler shift in the carrier frequency due to the relative motion of the receiver; and determining the apparent angle as a function of the Doppler shift.
- 9. The method of claim 7, wherein the apparent angle is determined as a function of the time delay of the arrival of the signaling stream.
- 10. The method of claim 7, wherein the signaling stream is a spread-spectrum signaling stream.
- 11. A method of improving the performance of a mobile cellular communications receiver receiving a spread-spectrum signaling stream on a carrier frequency from a stationary transmitter, the method comprising the steps of:
estimating a Doppler shift in the carrier frequency due to the relative motion of the receiver; determining the apparent angle between the receiver and transmitter relative to the direction of movement as a function of the Doppler shift; using the apparent angle to produce time-delayed replicas of the spread-spectrum signaling stream; and coherently adding the time-delayed replicas of the spread-spectrum signaling stream to synthesize an increased apparent receiver antenna aperture.
- 12. An improved communications receiver in an environment wherein relative motion exists between the receiver and a transmitter at a velocity and in a direction of movement, the improved communications receiver comprising:
an antenna for receiving a signaling stream on a carrier frequency from the transmitter; and a processor operative to perform the following functions:
a) determine the apparent angle between the receiver and the transmitter as a function of the direction of movement, b) generate time-delayed replicas of the received signaling stream based upon the apparent angle; and c) synthesize an increased apparent receiver antenna aperture by coherently summing the time-delayed replicas of the signaling stream.
- 13. The improved communications receiver of claim 12, wherein the processor is further operative to:
estimate a Doppler shift in the carrier frequency due to the relative motion; and determine the apparent angle as a function of the Doppler shift.
- 14. The improved communications receiver of claim 12, wherein the processor is further operative to:
estimate the apparent angle as a function of the time delay of the arrival of the signaling stream.
- 15. The improved communications receiver of claim 12, wherein the signaling stream is a spread spectrum signaling stream.
- 16. The improved communications receiver of claim 12, wherein the processor is disposed in a vehicle.
- 17. The improved communications receiver of claim 12, wherein the processor is disposed in a hand-held cellular telephone.
- 18. The improved communications receiver of claim 12, wherein the transmitter forms part of a satellite.
REFERENCE TO RELATED APPLICATION
[0001] This application claims priority from U.S. Provisional Patent Application Serial No. 60/350,788, filed Jan. 22, 2002, the entire content of which is incorporated herein by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60350788 |
Jan 2002 |
US |