Random phase multiple access system with location tracking
First Claim
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1. A method of determining the location of a communication device in a communication network, the method comprising:
- transmitting a ranging request signal at a first time from a transmitter, wherein the ranging request signal is spread using a first predetermined pseudo-noise (PN) code;
receiving a ranging response signal at a second time at a receiver, wherein the ranging response signal is spread using a second predetermined pseudo-noise (PN) code and further wherein the ranging response signal has a random timing offset; and
calculating a propagation delay at a controller coupled to the transmitter and the receiver based on the first time and the second time.
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Abstract
A method of determining the location of a communication tag in a random phase multiple access communication network is disclosed. A ranging request signal that is spread using a first pseudo-noise code and offset with a first random timing offset is transmitted at a first time. A ranging response signal that is spread using a second pseudo-noise code and offset with a second random timing offset is received at a second time. A propagation delay that is dependent on the first time and the second time is calculated.
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Citations
17 Claims
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1. A method of determining the location of a communication device in a communication network, the method comprising:
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transmitting a ranging request signal at a first time from a transmitter, wherein the ranging request signal is spread using a first predetermined pseudo-noise (PN) code; receiving a ranging response signal at a second time at a receiver, wherein the ranging response signal is spread using a second predetermined pseudo-noise (PN) code and further wherein the ranging response signal has a random timing offset; and calculating a propagation delay at a controller coupled to the transmitter and the receiver based on the first time and the second time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for determining the location of a communicating device, the apparatus comprising:
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a transmitter configured to transmit a ranging request signal at a first time, wherein the ranging request signal is spread using a first predetermined pseudo-noise (PN) code; a receiver configured to receive a ranging response signal at a second time, wherein the ranging response signal is spread using a second predetermined pseudo-noise (PN) code and further wherein the ranging response signal has a random timing offset; and a controller coupled to the transmitter and the receiver and operable to trigger the transmission of the ranging request signal, to wait for the reception of the ranging response signal, and to calculate a propagation delay based on the first time and the second time. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification