Method and apparatus for dual-channel diversity reception of a radio signal
First Claim
1. A method of diversity reception in a data communication receiver comprising a first antenna feed coupled to a first receiver element for demodulating a radio signal containing data bits and for deriving a first phase-locked loop error signal from the radio signal, the data communication receiver further comprising a second antenna feed coupled to a second receiver element for demodulating the radio signal and for deriving a second phase-locked loop error signal from the radio signal, the method comprising the steps of:
- (a) measuring a first signal strength of the radio signal from the first antenna feed during reception of a data bit;
(b) measuring a second signal strength of the radio signal from the second antenna feed during reception of the data bit;
(c) selecting the received data bit as demodulated by the first receiver element to be an optimum received data bit when the first signal strength is equal to or greater than the second signal strength;
(d) selecting the received data bit as demodulated by the second receiver element to be the optimum received data bit when the first signal strength is less than the second signal strength;
(e) selecting the first phase-locked loop error signal to control generation of a common local oscillator signal when the first signal strength is equal to or greater than the second signal strength; and
(f) selecting the second phase-locked loop error signal to control generation of the common local oscillator signal when the first signal strength is less than the second signal strength.
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Accused Products
Abstract
A data communication receiver (100) includes a first antenna feed (106) coupled to a first receiver element (110) for demodulating (502) a radio signal containing data bits and for deriving a first phase-locked loop error signal. The data communication receiver (100) also includes a second antenna feed (108) coupled to a second receiver element (112) for demodulating (502) the radio signal and for deriving a second phase-locked loop error signal. A received signal strength indicator (134, 144) measures signal strength of the radio signal from the first antenna feed (106) during reception of a data bit, and concurrently measures signal strength from the second antenna feed (108). A processor (146) then defines (506, 508, 512) the data bit as received from the antenna feed (106, 108) having the greater signal strength to be the optimum data bit.
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Citations
20 Claims
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1. A method of diversity reception in a data communication receiver comprising a first antenna feed coupled to a first receiver element for demodulating a radio signal containing data bits and for deriving a first phase-locked loop error signal from the radio signal, the data communication receiver further comprising a second antenna feed coupled to a second receiver element for demodulating the radio signal and for deriving a second phase-locked loop error signal from the radio signal, the method comprising the steps of:
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(a) measuring a first signal strength of the radio signal from the first antenna feed during reception of a data bit; (b) measuring a second signal strength of the radio signal from the second antenna feed during reception of the data bit; (c) selecting the received data bit as demodulated by the first receiver element to be an optimum received data bit when the first signal strength is equal to or greater than the second signal strength; (d) selecting the received data bit as demodulated by the second receiver element to be the optimum received data bit when the first signal strength is less than the second signal strength; (e) selecting the first phase-locked loop error signal to control generation of a common local oscillator signal when the first signal strength is equal to or greater than the second signal strength; and (f) selecting the second phase-locked loop error signal to control generation of the common local oscillator signal when the first signal strength is less than the second signal strength. - View Dependent Claims (2, 3)
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4. A data communication receiver for providing diversity reception of a radio signal containing data bits, the data communication receiver comprising:
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first and second antenna feeds having substantially de-correlated sensitivity to the radio signal; a first receiver element coupled to the first antenna feed for deriving a first phase-locked loop error signal from the radio signal; a second receiver element coupled to the second antenna feed for deriving a second phase-locked loop error signal from the radio signal; a switch element coupled to the first and second receiver elements for selecting between the first phase-locked loop error signal and the second phase-locked loop error signal as a transitory error signal for the data communication receiver; and a common local oscillator coupled to the first and second receiver elements and coupled to the switch element for receiving the transitory error signal to control a carrier signal generated by the common local oscillator and provided to the first and second receiver elements. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A selective call receiver for providing diversity reception of a radio signal containing data bits, the selective call receiver comprising:
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a data communication diversity receiver, comprising; an antenna element comprising first and second antenna feeds having substantially de-correlated sensitivity to the radio signal, a first receiver element coupled to the first antenna feed for deriving a first phase-locked loop error signal from the radio signal and for demodulating the radio signal to derive the data bits contained therein, a second receiver element coupled to the second antenna feed for deriving a second phase-locked loop error signal from the radio signal and for demodulating the radio signal to derive the data bits contained therein, a switch element coupled to the first and second receiver elements for switching between the first and second phase-locked loop error signals to select a transitory error signal for the selective call receiver, and a common local oscillator coupled to the first and second receiver elements and coupled to the switch element for receiving the transitory error signal to control a carrier signal generated by the common local oscillator and provided to the first and second receiver elements; a decoder coupled to the data communication diversity receiver for decoding an address sent in the radio signal; a processor coupled to the decoder and coupled to data communication diversity receiver for processing the data bits received in the radio signal to derive address and message information therefrom; a display coupled to the processor for displaying the message information derived therein; a memory coupled to the processor for storing the received data bits; and an alert generator coupled to the processor for generating an alert in response to receiving the message. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method of diversity reception in a data communication receiver comprising a first antenna feed coupled to a first receiver element for demodulating a radio signal containing data bits and for deriving a first phase-locked loop error signal from the radio signal, the data communication receiver further comprising a second antenna feed coupled to a second receiver element for demodulating the radio signal and for deriving a second phase-locked loop error signal from the radio signal, the method comprising the steps of:
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(a) measuring the first signal strength of the radio signal from the first antenna feed during reception of a data bit; (b) measuring a second signal strength of the radio signal from the second antenna feed during reception of the data bit; (c) selecting the first phase-locked loop error signal to control generation of a common local oscillator signal when the first signal strength is equal to or greater than the second signal strength; and (d) selecting the second phase-locked loop error signal to control generation of the common local oscillator signal when the first signal strength is less than the second signal strength.
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Specification