CDMA communications and geolocation system and method
First Claim
1. A spread-spectrum CDMA communications system for communicating base-message data to a plurality of remote units, and range locating each of said remote units, said spread-spectrum CDMA communications system comprising:
- a plurality of base stations for communicating base-message data to the plurality of remote units, each of said base stations including,base-spreading means for spread-spectrum processing the base-message data;
base-generic means for generating a base-generic-chip-code signal;
base-combiner means for combining the base-generic-chip-code signal with the spread-spectrum-processed-base-message data, thereby generating a base-CDMA signal;
base-transmitter means for transmitting the base-CDMA signal from said base station to said remote unit;
a base antenna coupled to said base-transmitter means;
each of said remote units including,a remote antenna;
remote-detection means, coupled to said remote antenna, for detecting the base-generic-chip-code signal embedded in the base-CDMA signal, and for recovering, using the detected-base-generic-chip-code signal, the base-message data communicated from said base station;
remote-spreading means for spread-spectrum processing remote-message data;
remote-combiner means, responsive to the detected-generic-chip-code signal and the spread-spectrum-processed-remote data for generating a remote-CDMA signal;
remote-transmitter means for transmitting the remote-CDMA signal from the remote unit to said base station;
wherein each of said base stations further includes,base-detection means, coupled to said base antenna, for detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal, and for recovering, using the detected-remote-generic-chip-code signal, the remote-message data communicated from said remote unit; and
range means, responsive to the detected- remote-generic-chip-code signal and the base-generic-chip-code signal for determining a range delay between said remote unit and said base station.
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Accused Products
Abstract
A spread-specttrm CDMA communications system for locating remote units, and for communicating message data between a plurality of remote units and a base station. The spread-spectrum CDMA communications system includes a plurality of base stations and a plurality of remote units. A base station has a spread-spectrummodulator for spread-spectrum processing the message data, and a transmitter for transmitting the spread-spectrum processed-message data, combined with a generic-chip-code signal, from the base station to a remote unit. The base station also has an antenna, and spread-spectrum detectors for recovering message-data communicated from the remote-units. A remote-unit has an antenna, and a detector coupled to the antenna for recovering data communicated from the base station. The detector includes a spread spectrum demodulator. Also, the remote unit has a device for converting the format of the data into a form suitable for communicating over radio waves, a spread spectrum modulator and a transmitter. The base station has a range circuit, which compares the generic-chip-code signal generated at the base station with the generic-chip-code signal received from the remote unit, for determining a range between the remote unit and the base station.
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Citations
42 Claims
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1. A spread-spectrum CDMA communications system for communicating base-message data to a plurality of remote units, and range locating each of said remote units, said spread-spectrum CDMA communications system comprising:
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a plurality of base stations for communicating base-message data to the plurality of remote units, each of said base stations including, base-spreading means for spread-spectrum processing the base-message data; base-generic means for generating a base-generic-chip-code signal; base-combiner means for combining the base-generic-chip-code signal with the spread-spectrum-processed-base-message data, thereby generating a base-CDMA signal; base-transmitter means for transmitting the base-CDMA signal from said base station to said remote unit; a base antenna coupled to said base-transmitter means; each of said remote units including, a remote antenna; remote-detection means, coupled to said remote antenna, for detecting the base-generic-chip-code signal embedded in the base-CDMA signal, and for recovering, using the detected-base-generic-chip-code signal, the base-message data communicated from said base station; remote-spreading means for spread-spectrum processing remote-message data; remote-combiner means, responsive to the detected-generic-chip-code signal and the spread-spectrum-processed-remote data for generating a remote-CDMA signal; remote-transmitter means for transmitting the remote-CDMA signal from the remote unit to said base station; wherein each of said base stations further includes, base-detection means, coupled to said base antenna, for detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal, and for recovering, using the detected-remote-generic-chip-code signal, the remote-message data communicated from said remote unit; and range means, responsive to the detected- remote-generic-chip-code signal and the base-generic-chip-code signal for determining a range delay between said remote unit and said base station. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A spread-spectrum CDMA communications system for communicating base-message data to a plurality of remote units, and range locating each of said remote units, said spread-spectrum CDMA communications system comprising:
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at least one base station for communicating base-message data to the plurality of remote units, each of said base stations including, a base-spread-spectrum modulator for spread-spectrum processing the message data; a base-generic-chip-code generator for generating a base-generic-chip-code signal; a base combiner for combining the base-generic-chip-code signal with the spread-spectrum-processed-base-message data, thereby generating a base-CDMA signal; a base transmitter for transmitting the base-CDMA signal from said base station to said remote unit; a base antenna coupled to said base transmitter; a plurality of remote units each of said remote units including, a remote antenna; a remote-unit detector, coupled to said remote antenna, for detecting the base-generic-chip-code signal embedded in the base-CDMA signal, and for recovering, using the detected-base-generic-chip-code signal, the base-message data communicated from said base station; a remote-spread-spectrummodulator for spread-spectrum processing remote-unit-message data; a remote-unit combiner, responsive to the detected-generic-chip-code signal and the spread-spectrum-processed-remote data for generating a remote-CDMA signal; a remote unit transmitter for transmitting the remote-CDMA signal from the remote unit to the base station; wherein each of said base stations further includes. a base detector, coupled to said base antenna, for detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal, and for recovering, using the detected-remote-generic-chip-code signal, the remote message data communicated from said remote unit; and a range circuit, responsive to the detected-remote-generic-chip-code signal and the base-generic-chip-code signal for determining a range delay between said remote unit and said base station. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A spread-spectrum CDMA communications system for communicating remote-message data to a base station, and range locating at each of said remote units, said spread-spectrum CDMA communications system comprising:
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a plurality of remote units for communicating remote-message data to at least one base station, each of said remote units including, remote-spreading means for spread-spectrum processing the remote-message data; remote-generic means for generating a remote-generic-chip-code signal; remote-combiner means for combining the remote-generic-chip-code signal with the spread-spectrum-processed-remote-message data, thereby generating a remote-CDMA signal; remote-transmitter means for transmitting the remote-CDMA signal from said remote unit to said base station; a remote antenna coupled to said remote-transmitter means; said base station including, a base antenna; base-detection means, coupled to said base antenna, for detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal, and for recovering, using the detected-remote-generic-chip-code signal, the remote-message data communicated from said remote unit; base processing means for spread-spectrum processing base-message data; base-combiner means, responsive to the detected-remote-generic-chip-code signal and the spread-spectrum-processed-base-message data for generating a base-CDMA signal; base-transmitter means for transmitting the base-CDMA signal from the base station to the remote unit; wherein at least one of said remote units further includes, remote-detection means, coupled to said remote antenna, for detecting the base-generic-chip-code signal embedded in the base-CDMA signal, and for recovering, using the detected-base-generic-chip-code signal, the base-message data communicated from said base station; and
range means, responsive to the detected-base-generic-chip-code signal and the remote-generic-chip-code signal, for determining a range delay between said remote unit and said base station. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A spread-spectrum CDMA communications system for communicating remote-message data to a base station, and range locating at each of said remote units, said spread-spectrum CDMA communications system comprising:
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a plurality of remote units for communicating remote-message data to a base station, each of said remote units including, a remote-spread-spectrummodulator for spread-spectrum processing the remote-message data; a remote-generic-chip-code generator for generating a remote-generic-chip-code signal; a remote-unit combiner for combining the remote-generic-chip-code signal with the spread-spectrum-processed-remote-message data, thereby generating a remote-CDMA signal; a remote-unit transmitter for transmitting the remote-CDMA signal from said remote unit to said base station; a remote antenna coupled to said remote-unit transmitter; said base station including, a base antenna; base-detection means, coupled to said base antenna, for detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal, and for recovering, using the detected-remote-generic-chip-code signal, the remote-message data communicated from said remote unit; a base spread-spectrummodulator for spread-spectrum processing base-message data; a base combiner, responsive to the detected-generic-remote-chip-code signal and the spread-spectrum-processed-base-message data for generating a base-CDMA signal; a base transmitter for transmitting the base-CDMA signal from the base station to the remote unit; wherein at least one of said remote units further includes, a remote detector, coupled to said remote antenna, for detecting the base-generic-chip-code signal embedded in the base-CDMA signal, and for recovering, using the detected-base-generic-chip-code signal, the base message data communicated from said base station; and a range circuit, responsive to the detected-base-generic-chip-code signal and the remote-generic-chip-code signal for determining a range delay between said remote unit and said base station. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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29. A spread-spectrum CDMA communications method for communicating base-message data to a plurality of remote units, and range locating each of said remote units, said spread-spectrum CDMA communications method comprising the steps of:
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spread-spectrum processing the base-message data; generating a base-generic-chip-code signal; combining the base-generic-chip-code signal with the spread-spectrum-processed-base-message data, thereby generating a base-CDMA signal; transmitting the base-CDMA signal from said base station to said remote unit; detecting the base-generic-chip-code signal embedded in the base-CDMA signal; recovering, using the detected-base-generic-chip-code signal, the base-message data; spread-spectrum processing remote-message data; generating, using the detected-generic-chip-code signal and the spread-spectrum-processed-remote data, a remote-CDMA signal; transmitting the remote-CDMA signal from the remote unit to the base station; detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal; recovering, using the detected-remote-generic-chip-code signal, the remote-message data; and determining, using the detected-remote-generic-chip-code signal and the base-generic-chip-code signal, a range delay between said remote unit and said base station. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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36. A spread-spectrum CDMA communications method for communicating base-message data from a plurality of base stations to a plurality of remote units, and range locating each of said plurality of remote units, and for communicating remote-message data from said plurality of remote units to said plurality of base stations, said spread-spectrum CDMA communication method comprising the steps of:
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spread-spectrum processing the base-message data; generating a base-generic-chip-code signal; generating a base-generic-chip-code signal with the spread-spectrum-processed-base-message data, thereby generating a base-CDMA signal; transmitting the base-CDMA signal from a base station to a remote unit; receiving the base-CDMA signal at the remote unit; detecting the base-generic-chip-code signal embedded in the base-CDMA signal; recovering, using the detected-base-generic-chip-code signal, the base-message data; spread-spectrum processing the remote-message data; generating a remote-generic-chip-code signal; generating, using the remote-generic-chip-code signal and the spread-spectrum-processed-remote-message data, a remote-CDMA signal; transmitting the remote-CDMA signal from the remote unit to the base station; receiving the remote-CDMA signal at the base station; detecting the remote-generic-chip-code signal embedded in the remote-CDMA signal; recovering, using the detected-remote-generic-chip-code signal, the remote-message data; and determining, using the detected-remote-generic-chip-code signal and the base-generic-chip-code signal, a range delay between the remote unit and the base station. - View Dependent Claims (37, 38, 39, 40, 41, 42)
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Specification