Abstract: A first radio has duplex communication with a second radio and a third radio, without using a base station by using a multiple-access protocol system. The first radio is configured to switch back and forth between being a master radio and a slave radio in the multiple-access protocol system. In some embodiments, time-division multiplexing is used as the multiple-access protocol system for the first radio, the second radio, and the third radio to communicate. In some embodiments, the master radio provides timing synchronization and/or assigns transmission slots for radios in the multiple-access protocol system.

Abstract: A system is provided for enabling a plurality of wireless communication transceivers to communicate. The system includes at least three wireless communication transceivers operable to communicate using a time division multiple access (TDMA) protocol. The at least three wireless communication transceivers are operable to alternatively serve as a master device according to a predetermined scheme to establish time slots for each of the transceivers, thereby enabling the at least three wireless communication transceivers to communicate in a conference-like manner and without a base station.

Abstract: For use in a spread spectrum communication system there is provided in an embodiment of the invention a spread spectrum transmitter which uses a voltage controlled oscillator (VCO) for generating a carrier signal wherein the frequency of the oscillator is controlled by the output of a correlation code generator and data generator coupled to a varactor in the oscillator. The use of a VCO eliminates the need for sidelobes associated with mixers. In another embodiment the separation of the output of the correlation code generator and data generator coupled to the varactor and the output of a phase detector coupled to the varactor simplifies tuning of the transmitter and in another embodiment the use of a high gain differential amplifier to couple the output of the correlation code generator and data generator to the varactor eliminates tuning the transmitter.

Abstract: For use in a spread spectrum communication system there is provided in an embodiment of the invention a spread spectrum transmitter which uses a voltage controlled oscillator (VCO) for generating a carrier signal wherein the frequency of the oscillator is controlled by the output of a correlation code generator and data generator coupled to a varactor in the oscillator. The use of a VCO eliminates the need for sidelobes associated with mixers. In another embodiment the separation of the output of the correlation code generator and data generator coupled to the varactor and the output of a phase detector coupled to the varactor simplifies tuning of the transmitter and in another embodiment the use of a high gain differential amplifier to couple the output of the correlation code generator and data generator to the varactor eliminates tuning the transmitter.