Multi-antenna beam-forming system for transmitting constant envelope signals decomposed from a variable envelope signal
AssigneeRambus Inc.
InventorsAbbas Komijani, Aliazam Abbasfar
Life of this patent
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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.
Claims21
A transmitter circuit comprising:
- a circuit for decomposing a variable envelope signal into at least a first constant envelope signal and a second constant envelope signal;
- a first amplifier coupled to the circuit for decomposing the variable envelope signal, wherein the first amplifier amplifies the first constant envelope signal;
- a first antenna coupled to the first amplifier that transmits an amplified first constant envelope signal;
- a second amplifier coupled to the circuit for decomposing the variable envelope signal, wherein the second amplifier amplifies the second constant envelope signal;
- a second antenna coupled to the second amplifier that transmits an amplified second constant envelope signal.
A method for transmitting RF signals comprising:
- generating a first signal having constant amplitude and varying phase;
- amplifying the first signal;
- transmitting the first signal wirelessly;
- generating a second signal having constant amplitude and varying phase;
- amplifying the second signal;
- transmitting the second signal wirelessly, wherein the first signal and the second signal are decomposed from a third signal that has variable amplitude and variable phase.
A method for wirelessly transmitting a signal comprising:
- decomposing a variable envelope signal into a first constant envelope signal and a second constant envelope signal;
- amplifying the first constant envelope signal;
- transmitting an amplified first constant envelope signal wirelessly over a first antenna;
- amplifying the second constant envelope signal;
- transmitting an amplified second constant envelope signal wirelessly over a second antenna.
A multi-antenna system for transmitting constant envelope signals decomposed from a variable envelope signal comprising:
- 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 and a second constant envelope signal, wherein the first constant envelope signal and the second constant envelope signal have constant amplitudes and varying phases which together represent the variable envelope signal;
- a first power amplifier coupled to the out-phasing decomposition circuit that amplifies the first constant envelope signal;
- a first antenna coupled to the first power amplifier for wireless transmission of the first constant envelope signal;
- a second power amplifier coupled to the out-phasing decomposition circuit that amplifies the second constant envelope signal;
- a second antenna coupled to the second power amplifier wireless transmission of the second constant envelope signal.
Dependencies are inferred from the claim text.