Diversity reception system
First Claim
1. A diversity reception system for signal reception, comprising:
- a plurality of receivers, each receiver generating a detected signal from a received radio frequency signal; and
a receiver selector coupled to each of the plurality of receivers to select a receiver and output the detected signal of the selected receiver, said receive selector including an audio selector for selecting the receiver from the plurality of receivers generating the detected signal having the highest relative signal-to-noise ratio when the detected signal from each of the receivers has a signal-to-noise ratio below a selected threshold signal-to-noise ratio corresponding to the maximum achievable signal-to-noise ratio, and for selecting the receiver from the plurality of receivers generating the detected signal having the highest relative signal strength when the detected signal from each of the receivers has a signal-to-noise ratio at the threshold.
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Abstract
A diversity reception system for use in narrow-band radio frequency communication systems includes a plurality of receivers that each generate a detected signal from a received radio frequency signal. The diversity reception system switches between receivers to output a high quality audio signal. The system selects a receiver having the highest quality reception at any given time by using a detected signal having the highest relative signal-to-noise ratio when the detected signals have less than a preselected threshold signal-to-noise ratio and a detected signal having the highest relative signal strength when one or more of the receivers is generating a detected signal having a signal-to-noise ratio at or above the preselected threshold signal-to-noise ratio.
47 Citations
20 Claims
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1. A diversity reception system for signal reception, comprising:
a plurality of receivers, each receiver generating a detected signal from a received radio frequency signal; and
a receiver selector coupled to each of the plurality of receivers to select a receiver and output the detected signal of the selected receiver, said receive selector including an audio selector for selecting the receiver from the plurality of receivers generating the detected signal having the highest relative signal-to-noise ratio when the detected signal from each of the receivers has a signal-to-noise ratio below a selected threshold signal-to-noise ratio corresponding to the maximum achievable signal-to-noise ratio, and for selecting the receiver from the plurality of receivers generating the detected signal having the highest relative signal strength when the detected signal from each of the receivers has a signal-to-noise ratio at the threshold.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A diversity reception system for high quality signal reception, comprising:
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a plurality of reception branches, each reception branch comprising; an antenna for receiving a transmitted radio frequency signal; a receiver individually coupled to the antenna for generating a detected signal from the received radio frequency signal, the receiver including a signal strength indicator for generating a received strength signal indicative of the signal strength of the received radio frequency signal; a diversity reception controller coupled to the signal strength indicator of the receiver and receiving the received strength signal, the diversity reception controller equalizing the received strength signal in relation to equalized signals in the other reception branches of the diversity reception system, and outputting the equalized signal; and a receiver selector coupled to the receiver and the diversity reception controller of each of the plurality of reception branches and outputting the detected signal of a selected receiver, said receiver selector including an audio selector for selecting the receiver from the plurality of receivers generating the detected signal having the highest relative signal-to-noise ratio when the detected signal from each of the receivers has a signal-to-noise ratio below a selected threshold signal-to-noise ratio corresponding to the maximum achievable signal-to-noise ratio, and for selecting the receiver from the plurality of receivers generating the detected signal having the highest relative signal strength when the detected signal from each of the receivers has a signal-to-noise ratio at the threshold. - View Dependent Claims (15, 16, 17, 18)
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19. A method for improving radio frequency signal reception in a communication system having a plurality of receivers, comprising the steps of:
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receiving a transmitted radio frequency signal at each of a plurality of receivers; detecting the radio frequency signal received by each receiver to generate a detected signal for each receiver; generating a plurality of equalized signals, each equalized signal corresponding to the detected signal for an individual receiver, wherein the generation of an equalized signal corresponding to an individual receiver comprises the steps of; generating a received strength signal related to the strength of the radio frequency signal received by the receiver; adjusting the amplitude of a received strength signal below a level required to produce a selected threshold signal-to-noise ratio corresponding to the maximum achievable signal-to-noise ratio to compensate for inaccuracies in the received strength signal and to provide correlation between the received strength signal and a signal-to-noise ratio of the detected signal; and calibrating the amplitude of the received strength signal to indicate the strength of the received signal with reference to a received strength signal above the level required to produce the preselected threshold signal-to-noise ratio; comparing the equalized signals for each of the plurality of receivers; and selecting the active receiver having the highest amplitude among the plurality of equalized signals. - View Dependent Claims (20)
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Specification