Increased capacity communication links with spectrum sharing
AssigneeThe Aerospace Corporation
InventorRajendra Kumar
Life of this patent
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Abstract
Various embodiments are directed to systems and methods for processing signals comprising a first component and a second component. A bandwidth of the first component may be centered at a center frequency. A bandwidth of the second component may be offset from the center frequency by an offset frequency such that at least a portion of the bandwidth of the second component overlaps a skirt of the first component. In various embodiments, a transmitter may split a single signal to generate the first and second components, shift the frequency of the second component, recombine and transmit the two components. Also, in various embodiments, a receiver may receive the signal and derive the first and second components by correcting for cross-interference.
Claims21
A transmitter system comprising:
- at least one processor and operatively associated memory, wherein the at least one processor is programmed to implement:
- a data splitter to receive an input signal and to split the signal into a first signal and a second signal, wherein a bandwidth of the first signal is centered at a center frequency;
- a first baseband modulator to receive the first signal and to generate a baseband modulated first signal;
- a second baseband modulator to receive the second signal and to generate a baseband modulated second signal;
- a subcarrier modulator to receive the baseband modulated second signal and to shift the bandwidth of the baseband modulated second signal by an offset frequency to generate a shifted second signal, wherein the offset frequency is offset from the center frequency such that at least a portion of the bandwidth of the second signal overlaps a skirt of the bandwidth of the first signal;
- and
- a signal combiner to combine the baseband modulated first signal and the shifted second signal to generate a composite signal.
A method for preparing a signal for transmission, the method comprising:
- a first computer device receiving an input signal, wherein the first computer device comprises a processor and operatively associated memory;
- the first computer device splitting the input signal into a first signal and a second signal;
- the first computer device modulating the first signal to generate a baseband modulated first signal;
- the first computer device modulating the second signal to generate a baseband modulated second signal;
- the first computer shifting the bandwidth of the baseband modulated second signal by an offset frequency to generate a shifted second signal, wherein the offset frequency is offset from the center frequency such that at least a portion of the bandwidth of the second signal overlaps a skirt of the bandwidth of the first signal;
- and
- the first computer combining the baseband modulated first signal and the shifted second signal to generate a composite signal.
A system for processing a received signal, the system comprising:
- a first computer device comprising a processor and operatively associated memory, wherein the first computer device is programmed to implement:
- a downconverter to downconvert the received signal to a baseband signal, wherein the received signal comprises a first component and a second component, wherein a bandwidth of the first component is centered at a center frequency and wherein a bandwidth of the second component is offset from the center frequency by an offset frequency such that at least a portion of the bandwidth of the second component overlaps a skirt of the first component;
- a second component estimator module to derive a second component estimate from the baseband signal;
- and
- a first component estimator module to cancel interference in the first component due to the second component considering the second component estimate.
A method for processing a received signal, the method comprising:
- a first computer device downconverting the received signal to a baseband signal, wherein the received signal comprises a first component and a second component, wherein a bandwidth of the first component is centered at a center frequency and wherein a bandwidth of the second component is offset from the center frequency by an offset frequency such that at least a portion of the bandwidth of the second component overlaps a skirt of the first component, and wherein the first computer device comprises a processor and operatively associated memory;
- the first computer device deriving a second component estimate from the baseband signal;
- and
- the first computer device canceling interference in the first component due to the second component considering the second component estimate.
Dependencies are inferred from the claim text.