CDMA communications and geolocation system and method

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:

• 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.

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:

• 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.

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:

• 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.

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:

• 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.

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:

• 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.