Sinusoidal phase modulation method and system
AssigneeAironet Wireless Communications, Inc.
InventorJames J. Friedmann
Life of this patent
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Abstract
A system which phase modulates a carrier to produce a carrier signal which transitions in phase between predetermined phase states as a function of the data, wherein a rate at which the carrier signal changes phase during a transition between the predetermined phase states varies substantially sinusoidally. The phase modulation provides a constant amplitude modulated waveform having low side lobes. Such modulation method preserves the high noise tolerance capabilities associated with FH systems and the high data throughput capabilities of DS systems.
Claims28
A method of transmitting data, comprising the step of:
- producing a carrier signal which transitions in phase between predetermined phase states as a function of the data, wherein a rate at which the carrier signal changes phase during a transition between the predetermined phase states varies substantially sinusoidally.
A transmitter for transmitting data, comprising:
- a circuit for producing a carrier signal which transitions in phase between predetermined phase states as a function of the data, wherein a rate at which the carrier signal changes phase during a transition between the predetermined phase states varies substantially sinusoidally;
- and
- a radio frequency circuit for transmitting the carrier signal.
A method of transmitting data, comprising the step of:
- producing a carrier signal which transitions in phase between predetermined phase states as a function of the data, wherein a rate at which the carrier signal changes phase during a transition between the predetermined phase states gradually increases from zero at a beginning of the transition and gradually decreases to zero at an end of the transition.
A transmitter for transmitting data, comprising:
- a circuit for producing a carrier signal which transitions in phase between predetermined phase states as a function of the data, wherein a rate at which the carrier signal changes phase during a transition between the predetermined phase states gradually increases from zero at a beginning of the transition and gradually decreases to zero at an end of the transition;
- and
- a radio frequency circuit for transmitting the carrier signal.
A cellular communication system, comprising:
- a network;
- a host computer coupled to the network:
- a plurality of base stations coupled to the network and communicating with the host computer, each of the base stations comprising a base station transceiver for transmitting and receiving wireless communications;
- and
- a plurality of mobile terminals each for communicating with the network by way of at least one of the plurality of base stations, each of the plurality of mobile terminals having a mobile terminal transceiver for transmitting and receiving wireless communications with respect to the at least one of the plurality of base stations;
- wherein the transceiver of at least one of the mobile terminals or base stations comprises:
- a transmitter portion for transmitting data, the transmitter portion comprising:
- a circuit for producing a carrier signal which transitions in phase between predetermined phase states as a function of the data, wherein a rate at which the carrier signal changes phase during a transition between the predetermined phase states varies substantially sinusoidally;
- and
- a radio frequency circuit for transmitting the carrier signal.
A radio for communicating in a spread spectrum communication system, said radio comprising:
- a spread spectrum receiver for receiving information;
- and
- a spread spectrum transmitter for transmitting information, said transmitter having a circuit for producing an RF signal which transitions in phase between predetermined phase states as a function of the information to be transmitted, wherein a rate at which the RF signal changes phase during a transition between the predetermined phase states varies substantially sinusoidally.
Dependencies are inferred from the claim text.