Multi-antenna beam-forming system for transmitting constant envelope signals decomposed from a variable envelope signal
First Claim
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1. A phased-array antenna system, comprising:
- a decomposition circuit for decomposing a variable envelope signal into at least a first constant envelope signal xc1 and a second constant envelope signal xc2;
an interconnection network which splits xc1 into a first set of N signals, and splits xc2 into a second set of N signals, and alternates the first and second sets of signals to form a third set of 2N signals;
a set of delay circuits coupled to the third set of 2N signals, wherein the set of delay circuits applies incrementally increasing or decreasing beam-steering delays to the third set of 2N signals;
a set of 2N amplifiers to amplify the delayed third set of signals; and
a set of 2N antennas to transmit the delayed and amplified third set of signals.
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Abstract
Embodiments in the present disclosure pertain to a multi-antenna beam-forming system for transmitting constant envelope signals decomposed from a variable envelope signal. The variable envelope signal is decomposed into two constant envelope signals. Each of the constant envelope signals are separately amplified by power amplifiers and transmitted over separate antennas. Beam steering delays can be added to the transmit paths of the constant envelope signals to direct the beam to the location of a receiver. The transmitted constant envelope signals combine through spatial out-phasing such that a receiving antenna receives a variable envelope signal.
93 Citations
13 Claims
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1. A phased-array antenna system, comprising:
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a decomposition circuit for decomposing a variable envelope signal into at least a first constant envelope signal xc1 and a second constant envelope signal xc2; an interconnection network which splits xc1 into a first set of N signals, and splits xc2 into a second set of N signals, and alternates the first and second sets of signals to form a third set of 2N signals; a set of delay circuits coupled to the third set of 2N signals, wherein the set of delay circuits applies incrementally increasing or decreasing beam-steering delays to the third set of 2N signals; a set of 2N amplifiers to amplify the delayed third set of signals; and a set of 2N antennas to transmit the delayed and amplified third set of signals. - View Dependent Claims (2, 3, 4)
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5. A method for transmitting signals through a phased-array antenna system, comprising:
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decomposing a variable envelope signal into a first constant envelope signal xc1 and a second constant envelope signal xc2; splitting xc1 into a first set of N signals; splitting xc2 into a second set of N signals; alternating the first and second set of signals to form a third set of 2N signals; applying incrementally increasing or decreasing beam-steering delays to the third set of signals; amplifying the delayed third set of signals through a set of 2N amplifiers; and transmitting the delayed and amplified third set of signals through a set of 2N antennas. - View Dependent Claims (6, 7)
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8. A phased-array antenna system for transmitting constant envelope signals decomposed from a variable envelope signal, comprising:
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a processor for generating the variable envelope signal having varying amplitudes and varying phases; an out-phasing decomposition circuit coupled to the processor that generates at least a first constant envelope signal xc1 and a second constant envelope signal xc2, wherein xc1 and xc2 have constant amplitudes and varying phases which together represent the variable envelope signal; an interconnection network which splits xc1 into a first set of N signals, and splits xc2 into a second set of N signals, and alternates the first and second set of signals to form a third set of 2N signals; a set of delay circuits coupled to the third set of 2N signals, wherein the set of delay circuits applies incrementally increasing or decreasing beam-steering delays to the third set of 2N signals; a set of 2N amplifiers to amplify the delayed third set of signals; and a set of 2N antennas to wirelessly transmit the delayed third set of signals. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification