Beamformer phase optimization for a multi-layer MIMO system augmented by radio distribution network
First Claim
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1. A multiple inputs multiple outputs (MIMO) receiving system receiving N channel layers transmitted from N transmit antennas, comprising:
- a radio distributed network (RDN) having N beamformers, N being a positive integer greater than 1, each of the N beamformers having KN antennas comprising one primary receive antenna and KN−
1 additional receive antennas, KN is a positive integer greater than 1;
KN−
1 phase shifters within each of the N beamformers configured to phase shift the received signals from each of the KN−
1 additional receive antennas within each of the N beamformers;
N combiners respectively associated with the N beamformers, each of the N combiners is configured to combine the KN−
1 phase shifted signals and the received signal from the primary antenna for each of the N beamformers;
radio and baseband circuitry configured to receive the combined signals from each of the N combiners; and
the MIMO receiving system is configured to select KN−
1 phases for the KN−
1 phase sifters in each of the N beamformers that;
(a) optimizes performance of the N channel layers via channel estimation of each of the N layers as seen by the radio and baseband circuitry, and (b) maximizes a total received power from all transmitted signals received at the MIMO receiving system by all of the receive antennas.
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Abstract
A system for selecting optimal phase combinations for RF beamformers in a MIMO hybrid receiving systems augmented by RF Distribution Network. The system addresses the issue of providing beamforming gains for a plurality of layers using one common set of weights for each beamformer. The specification may be based on channel estimation of all layers as viewed by all receiving antennas, and maximizing metrics that capture the total received power.
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Citations
6 Claims
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1. A multiple inputs multiple outputs (MIMO) receiving system receiving N channel layers transmitted from N transmit antennas, comprising:
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a radio distributed network (RDN) having N beamformers, N being a positive integer greater than 1, each of the N beamformers having KN antennas comprising one primary receive antenna and KN−
1 additional receive antennas, KN is a positive integer greater than 1;KN−
1 phase shifters within each of the N beamformers configured to phase shift the received signals from each of the KN−
1 additional receive antennas within each of the N beamformers;N combiners respectively associated with the N beamformers, each of the N combiners is configured to combine the KN−
1 phase shifted signals and the received signal from the primary antenna for each of the N beamformers;radio and baseband circuitry configured to receive the combined signals from each of the N combiners; and the MIMO receiving system is configured to select KN−
1 phases for the KN−
1 phase sifters in each of the N beamformers that;
(a) optimizes performance of the N channel layers via channel estimation of each of the N layers as seen by the radio and baseband circuitry, and (b) maximizes a total received power from all transmitted signals received at the MIMO receiving system by all of the receive antennas. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification