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 having number N channels, comprising:
- a radio distributed network (RDN) having number N beamformers, each having number Ki receive antennas, wherein N is an integer greater than 1 and each Ki is an integer greater than 1 for 1≦
i≦
N; and
a phase shifter coupled to each one of the Ki receive antennas in each one of the N beamformers,wherein the MIMO receiving system is configured to;
(a) determine a phase for each one of said phase shifters that optimizes performance of said MIMO receiving system when receiving a plurality of transmit streams from a plurality of transmit antennas, wherein the optimization is achieved by channel estimation of each one of the transmit streams as seen by each one of the receive antennas, and (b) select a phase for each receive antenna that maximizes a total received power from all transmit streams reaching said receive antenna, wherein the total received power is calculated based on the channel estimation.
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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
10 Claims
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1. A multiple inputs multiple outputs (MIMO) receiving system having number N channels, comprising:
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a radio distributed network (RDN) having number N beamformers, each having number Ki receive antennas, wherein N is an integer greater than 1 and each Ki is an integer greater than 1 for 1≦
i≦
N; anda phase shifter coupled to each one of the Ki receive antennas in each one of the N beamformers, wherein the MIMO receiving system is configured to;
(a) determine a phase for each one of said phase shifters that optimizes performance of said MIMO receiving system when receiving a plurality of transmit streams from a plurality of transmit antennas, wherein the optimization is achieved by channel estimation of each one of the transmit streams as seen by each one of the receive antennas, and (b) select a phase for each receive antenna that maximizes a total received power from all transmit streams reaching said receive antenna, wherein the total received power is calculated based on the channel estimation. - View Dependent Claims (2, 4, 5, 8, 9, 10)
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3. (canceled)
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6-7. -7. (canceled)
Specification