RECEIVER AND METHOD FOR RECEIVING A COMPOSITE SIGNAL
First Claim
1. A receiver for receiving a binary offset carrier signal, the receiver comprising:
- a receiver front-end for down-converting a received composite signal;
an analog-to-digital converter for converting the received composite signal to a digital received composite signal;
a first signal generator for generating a first signal;
a second signal generator for generating a second signal;
a data storage device for providing a null code;
a multiplexer for multiplexing a first combination in a first mode or a second combination of input signals in a second mode to form a precursor signal, the first combination comprising the first signal and the null code consistent with a predetermined time sequence for expression of the null code in the precursor signal, the second combination comprising the combination of the first signal and the second signal;
a ranging code generator for generating a ranging code;
a mixer accepting the ranging code and the precursor signal and outputting a locally generated reference signal;
a code correlator for correlating the digital received composite signal to the locally generated reference signal to decode at least a first portion of the received composite signal in the first mode;
a tracking loop signal processor for processing the locally generated reference signal with respect to the digital received composite signal to maximize correlation of the received composite signal to the locally generated reference signal; and
a controller for controlling the multiplexor to operate in the first mode or in the second mode consistent with a level of service, geographic region, or time period authorized for the receiver or an end user of the receiver.
1 Assignment
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Accused Products
Abstract
A multiplexer is capable of multiplexing at least two signals selected from the first signal, the second signal and the null code signal. In a first mode, the multiplexer multiplexes the first signal and the null code signal consistent with a predetermined time sequence for expression of the null code in first precursor signal In a second mode, the multiplexer multiplexes the first signal and the second signal to provide a second precursor signal. A correlator can correlate the digital received composite signal to the locally generated reference signal to decode at least a first portion of the received composite signal or the entire received composite signal, depending upon the mode (e.g., operation in the first or second mode).
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Citations
34 Claims
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1. A receiver for receiving a binary offset carrier signal, the receiver comprising:
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a receiver front-end for down-converting a received composite signal; an analog-to-digital converter for converting the received composite signal to a digital received composite signal; a first signal generator for generating a first signal; a second signal generator for generating a second signal; a data storage device for providing a null code; a multiplexer for multiplexing a first combination in a first mode or a second combination of input signals in a second mode to form a precursor signal, the first combination comprising the first signal and the null code consistent with a predetermined time sequence for expression of the null code in the precursor signal, the second combination comprising the combination of the first signal and the second signal; a ranging code generator for generating a ranging code; a mixer accepting the ranging code and the precursor signal and outputting a locally generated reference signal; a code correlator for correlating the digital received composite signal to the locally generated reference signal to decode at least a first portion of the received composite signal in the first mode; a tracking loop signal processor for processing the locally generated reference signal with respect to the digital received composite signal to maximize correlation of the received composite signal to the locally generated reference signal; and a controller for controlling the multiplexor to operate in the first mode or in the second mode consistent with a level of service, geographic region, or time period authorized for the receiver or an end user of the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for receiving a binary offset carrier signal, the method comprising:
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down-converting a received composite signal; converting the received composite signal to a digital received composite signal; generating a first signal and a second signal; providing a null code; in a first mode, multiplexing the first signal and the null code consistent with a predetermined time sequence for expression of the null code in a first precursor signal in a second mode mutually exclusive to the first mode, multiplexing the first signal and the second signal to produce a second precursor signal; generating a ranging code; accepting the ranging code and the precursor signal and outputting a locally generated reference signal, the precursor signal comprising the first precursor signal or the second precursor signal; correlating the digital received composite signal to the locally generated reference signal to decode at least a first portion of the received composite signal; and processing the locally generated reference signal with respect to the digital received composite signal to maximize correlation of the received composite signal to the locally generated reference signal. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification