Lens antenna array system with power optimization for improved signal quality
A lens antenna array system for wireless communication is provided that includes a transmitter having a first lens and a receiver having a second lens. The transmitter transmits a first plurality of RF signals across a plurality of near-field communication links to the receiver. Based upon a first signal quality determination at the receiver, the transmitter adjusts a plurality of gains to increase a signal quality for a second plurality of RF signals transmitted across the plurality of near-field communication links.
1. A method of wireless communication, comprising:
at a transmitter including an array of transmit antennas arranged in a focal region of a transmit lens, amplifying a plurality of first modulated RF signals through a plurality of power amplifiers according to a default gain to produce a corresponding plurality of first amplified modulated RF signals;
transmitting from each transmit antenna a respective first amplified modulated RF signal from the plurality of first amplified modulated RF signals to form a plurality of first transmitted RF signals, each first transmitted RF signal refracting through the transmit lens and near-field propagating to a receiver;
adjusting the default gain for each power amplifier responsive to a first signal quality determination for the plurality of first transmitted RF signals to form a plurality of adjusted gains; and
amplifying a plurality of second modulated RF signals through the plurality of power amplifiers according to the plurality of adjusted gains to produce a corresponding plurality of second amplified modulated RF signals.
2. The method of claim 1 , further comprising:
transmitting from each transmit antenna a respective second amplified modulated RF signal from the plurality of second amplified modulated RF signals to form a plurality of second transmitted RF signals, each second transmitted RF signal refracting through the transmit lens and near-field propagating to the receiver.
3. The method of claim 2 , further comprising:
at the transmitter, receiving a second signal quality determination for each second amplified modulated RF signal in the plurality of second amplified modulated RF signals, wherein the first signal quality determination includes at least one unacceptable signal quality and wherein the second signal quality determination includes no unacceptable signal quality.
4. The method of claim 3 , wherein forming the first signal quality determination and forming the second signal quality determination both comprise forming a signal-to-interference-ratio (SINR).
5. The method of claim 4 , wherein the at least one unacceptable signal quality comprises an SINR that is less than an acceptable level.
6. The method of claim 1 , wherein adjusting the default gain for each power amplifier responsive to the first signal quality determination to form the plurality of adjusted gains decreases a gain for a first subset of power amplifiers from the default gain and increases a gain for a second subset of power amplifiers from the default gain.
7. The method of claim 1 , further comprising:
producing a plurality of baseband input data streams; and
modulating an RF signal responsive to each baseband input data stream to form the plurality of first modulated RF signals.
8. The method of claim 7 , wherein modulating the RF signal responsive to each baseband input data stream comprises modulating the RF signal according to an on-off keying modulation responsive to each baseband input data stream.
9. A method of wireless communication, comprising:
in a lens antenna system including a receiver having an array of receive antennas arranged in a focal region of a second lens, receiving at each receive antenna a first RF signal that near-field propagated from a transmitter to form a plurality of first received RF signals;
at the receiver, forming a plurality of first signal quality determinations corresponding to the plurality of first received RF signals; and
reporting the plurality of first signal quality determinations to the transmitter.
10. The method of claim 9 , further comprising:
at the receiver, receiving at each receive antenna a second RF signal that near-field propagated from the transmitter to form a plurality of second received RF signals; and
at the receiver, forming a plurality of second signal quality determinations corresponding to the plurality of second received RF signals, wherein the plurality of first signal quality determinations includes at least one unacceptable signal quality and the wherein the plurality of second signal quality determinations includes no unacceptable signal quality.
11. The method of claim 10 , wherein each first signal quality determination in the plurality of first signal quality determinations comprises a signal-to-interference ratio (SINR) and wherein each second signal quality determination in the plurality of second signal quality determinations comprises an SINR.
12. The method of claim 11 , wherein the at least one unacceptable signal quality comprises an SINR that is less than an acceptable level.
13. The method of claim 11 , further comprising:
demodulating each second received RF signal in the plurality of second received RF signals to form a plurality of received baseband data streams.
14. The method of claim 11 , wherein demodulating each second received RF signal comprises an on-off keying demodulation.