Backhaul radio with adaptive beamforming and sample alignment
First Claim
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1. A backhaul radio comprising:
- a plurality of receive radio frequency (RF) chains, wherein each receive RF chain is capable of converting from one of a plurality of receive RF signals to a respective one of a plurality of receive chain output signals;
a plurality of directive gain antenna elements; and
a processor at the receiver to compute and feedback the phase and sample timing offset (STO) for optimal beamforming,wherein the processor is further configured to calculate a plurality of relative STOs and a plurality of relative phase offsets and average and quantize the plurality of relative STOS and the plurality of relative phase offsets to determine the feedback.
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Abstract
A backhaul radio is disclosed that operates in multipath propagation environments such as obstructed LOS conditions with uncoordinated interference sources in the same operating band. Such a backhaul radio may use adaptive beamforming and sample alignment at the transmitter to enhance the link performance. Such backhaul radios may communicate with each other to compute and apply optimal beamforming parameters for a particular propagation environment through a closed-loop feedback mechanism.
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Citations
18 Claims
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1. A backhaul radio comprising:
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a plurality of receive radio frequency (RF) chains, wherein each receive RF chain is capable of converting from one of a plurality of receive RF signals to a respective one of a plurality of receive chain output signals; a plurality of directive gain antenna elements; and a processor at the receiver to compute and feedback the phase and sample timing offset (STO) for optimal beamforming, wherein the processor is further configured to calculate a plurality of relative STOs and a plurality of relative phase offsets and average and quantize the plurality of relative STOS and the plurality of relative phase offsets to determine the feedback. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A fixed wireless access point comprising:
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a plurality of receive radio frequency (RF) chains, wherein each receive RF chain is capable of converting from one of a plurality of receive RF signals to a respective one of a plurality of receive chain output signals; a plurality of directive gain antenna elements; and a processor at the receiver to compute and feedback the phase and sample timing offset (STO) for optimal beamforming, wherein the processor is further configured to calculate a plurality of relative STOs and a plurality of relative phase offsets and average and quantize the plurality of relative STOS and the plurality of relative phase offsets to determine the feedback. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification