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US 8,576,940 B2Granted
Systems/methods of adaptively varying a bandwidth and/or frequency content of communications
AssigneeEICES Research, Inc.
InventorPeter D. Karabinis
Life of this patent
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Abstract
Embodiments are provided wherein a bandwidth of a waveform sequence that is transmitted by a transmitter in order to convey information is varied. According to additional embodiments, a set of frequencies that is used to provide frequency content to the waveform sequence is also varied and comprises non-contiguous first and second frequency intervals wherein a third frequency interval that is between the first and second frequency intervals remains devoid of providing frequency content to the waveform sequence in order to avoid interference. The invention is relevant to 4G LTE carrier aggregation systems/methods and/or other aspects of 4G LTE. Various transmitter/receiver embodiments are disclosed including direct synthesis transmitter/receiver embodiments.
Claims47
A communications method comprising:
- processing by a processor an input bit sequence {b} to thereby form an information symbol sequence {Ik};
- wherein k denotes values of discrete time;
- k=1, 2, . . . ;
- mapping by the processor the information symbol sequence {Ik} into a waveform sequence {Uk(nT)};
- wherein for each value of k, n=1, 2, . . . , N;
- and
- conveying information by a transmitter by transmitting the waveform sequence {Uk(nT)};
- wherein the processor is configured to vary a bandwidth B of the waveform sequence {Uk(nT)}, without resorting to chipping in order to vary the bandwidth B of the waveform sequence, by using for said mapping first and second waveform elements that differ therebetween in bandwidth such that first and second waveform symbols of the waveform sequence {Uk(nT)} comprise respective first and second bandwidths that differ therebetween;
- and/or
- wherein the processor is configured to vary a frequency range that is used to provide frequency content to the waveform sequence {Uk(nT)}, without resorting to chipping in order to vary the frequency range, by using for said mapping third and fourth waveform elements that comprise respective third and fourth frequency ranges that differ therebetween in frequency content such that third and fourth waveform symbols of the waveform sequence {Uk(nT)} comprise respective third and fourth ranges of frequencies that differ therebetween in frequency content.
7 more elements
A communications method comprising:
- receiving by a receiver a waveform sequence {Uk(nT)};
- wherein k denotes values of discrete time;
- k=1, 2, . . . ;
- and wherein for each value of k, n=1, 2, . . . , N;
- correlating the waveform sequence {Uk(nT)} that is received by the receiver with a plurality of elements of a waveform alphabet;
- mapping the waveform sequence {Uk(nT)} into an information symbol sequence {Ik} responsive to said correlating;
- and
- receiving information by the receiver responsive to said mapping;
- wherein said waveform alphabet comprises first and second waveforms comprising respective first and second spectral components that differ therebetween.
6 more elements
A communications system comprising:
- a processor that is configured to convert an input bit sequence {b} into an information symbol sequence {Ik};
- wherein k denotes values of discrete time;
- k=1, 2, . . . ;
- and to map the information symbol sequence {Ik} into a waveform sequence {Uk(nT)};
- wherein for each value of k, n=1, 2, . . . , N;
- and
- a transmitter that is configured to convey information by transmitting the waveform sequence {Uk(nT)};
- wherein the processor is configured to vary a bandwidth B of the waveform sequence {Uk(nT)}, without resorting to chipping in order to vary the bandwidth B of the waveform sequence, by using first and second waveform elements in order to map the information symbol sequence {Ik} into a waveform sequence {Uk(nT)} that differ therebetween in bandwidth such that first and second waveform symbols of the waveform sequence {Uk(nT)} comprise respective first and second bandwidths that differ therebetween;
- and/or
- wherein the processor is configured to vary a frequency range that is used to provide frequency content to the waveform sequence {Uk(nT)}, without resorting to chipping in order to vary the frequency range, by using third and fourth waveform elements in order to map the information symbol sequence {Ik} into a waveform sequence {Uk(nT)} that comprise respective third and fourth frequency ranges that differ therebetween in frequency content such that third and fourth waveform symbols of the waveform sequence {Uk(nT)} comprise respective third and fourth ranges of frequencies that differ therebetween in frequency content.
7 more elements
A communications system comprising:
- a receiver that is configured to receive a waveform sequence {Uk(nT)};
- wherein k denotes values of discrete time;
- k=1, 2, . . . ;
- and wherein for each value of k, n=1, 2, . . . , N;
- and
- a processor that is configured to correlate the waveform sequence {Uk(nT)} with a plurality of elements of a waveform alphabet;
- to map the waveform sequence {Uk(nT)} into an information symbol sequence {Ik} responsive to said correlation and to receive information responsive to said mapping;
- wherein said waveform alphabet comprises first and second waveforms comprising respective first and second spectral components that differ therebetween.
5 more elements
A communications method comprising:
- processing by a processor an input bit sequence {b} to thereby form an information symbol sequence {Ik};
- wherein k=1, 2, . . . ;
- mapping by the processor the information symbol sequence {Ik} into a baseband waveform sequence {Uk(nT)} by using first and second waveform elements differing in spectral content therebetween;
- wherein for each value of k, n=1, 2, . . . ;
- and
- conveying information by a transmitter by transmitting the baseband waveform sequence {Uk(nT)};
- wherein the processor is configured to vary a spectral content of the baseband waveform sequence {Uk(nT)}, without resorting to conventional chipping with a binary waveform, by using the first and second waveform elements that differ therebetween in spectral content and by basing respective first and second waveform symbols of the baseband waveform sequence {Uk(nT)} on said first and second waveform elements that differ therebetween in spectral content.
4 more elements
A communications system comprising:
- a processor that is configured to process an input bit sequence {b} to thereby form an information symbol sequence {Ik};
- wherein k=1, 2, . . . ;
- and to map the information symbol sequence {Ik} into a baseband waveform sequence {Uk(nT)} by using first and second waveform elements differing in spectral content therebetween;
- wherein for each value of k, n=1, 2, . . . ;
- and
- a transmitter that is configured to convey information by transmitting the baseband waveform sequence {Uk(nT)};
- wherein the processor is further configured to vary a spectral content of the baseband waveform sequence {Uk(nT)}, without resorting to conventional chipping with a binary waveform, by using the first and second waveform elements that differ therebetween in spectral content and by basing respective first and second waveform symbols of the baseband waveform sequence {Uk(nT)} on said first and second waveform elements that differ therebetween in spectral content.
4 more elements
Dependencies are inferred from the claim text.