Implementing blind tuning in hybrid MIMO RF beamforming systems
First Claim
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1. A method comprising:
- receiving multiple input multiple output (MIMO) radio frequency (RF) signals through M antennas coupled via N beamformers to a MIMO receiving system having N channels, wherein M>
N;
measuring channel fading rate at a baseband level;
grading each one of K antennas, based on their total data throughput coming from various data streams, wherein the total data throughput is represented by a total data throughput indicator (TDTI);
determining a number of antennas L to be combined out of the K antennas of each one of the N beamformers, based on the measured fading rate, wherein the selecting of said specific subset L is based on the total data throughput grades of the K antennas; and
repeatedly applying a tuning process to L antennas at each of the N beamformers, wherein the tuning process comprises adjusting a phase of each of said L antennas to maximize a TDTI.
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Abstract
A system and a method for applying a blind tuning process to M antennas coupled via N beamformers to a multiple input multiple output (MIMO) receiving system having N channels, wherein M>N, are provided herein. The method includes the following steps: Periodically measuring channel fading rate at a baseband level to determine the number of antennas L out of K antennas connected to each one of the beamformers, to be combined at each one of the N beamformers; assigning the antennas to the subset L according to some criteria such as best quality indicator; repeatedly applying a tuning process to L antennas in each one of the N beamformers.
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Citations
19 Claims
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1. A method comprising:
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receiving multiple input multiple output (MIMO) radio frequency (RF) signals through M antennas coupled via N beamformers to a MIMO receiving system having N channels, wherein M>
N;measuring channel fading rate at a baseband level; grading each one of K antennas, based on their total data throughput coming from various data streams, wherein the total data throughput is represented by a total data throughput indicator (TDTI); determining a number of antennas L to be combined out of the K antennas of each one of the N beamformers, based on the measured fading rate, wherein the selecting of said specific subset L is based on the total data throughput grades of the K antennas; and repeatedly applying a tuning process to L antennas at each of the N beamformers, wherein the tuning process comprises adjusting a phase of each of said L antennas to maximize a TDTI. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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receiving multiple input multiple output (MIMO) radio frequency (RF) signals through M antennas coupled via N beamformers to a MIMO receiving system having N channels, wherein M>
N;measuring channel fading rate at a baseband level; determining a number of antennas L to be combined out of K antennas of each one of the N beamformers, based on the measured fading rate; and repeatedly applying a tuning process to L antennas at each of the N beamformers, wherein said tuning process includes at least one round of coarse tuning process, said coarse tuning process comprising; selecting best graded antenna as an anchor; combining the anchor with the second best graded antenna and measure Total Data Throughput Indicator (TDTI); flipping the phase of the second best antenna by approximately 180°
, and measuring the TDTI;choosing the better TDTI as preferred coarse phase; combining the next best graded antenna with the previously combined antennas and measure the TDTI; flipping the phase of the next best graded antenna and measure TDTI, and selecting the better TDTI as preferred coarse phase for the next best graded antenna; repeating the adding of antennas to the combiner per their grading until all L antennas are added.
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11. A system comprising
M antennas; -
N beamformers connected to the M antennas; a multiple input multiple output (MIMO) receiving system having N channels, connected to the N beamformers, wherein M>
N; andan antenna subset selection and tuning module configured to; measure channel fading rate at a baseband level; grade each one of the K antennas, based on their total data throughput coming from various data streams, wherein the total data throughput is represented by a total data throughput indicator (TDTI); determine a number of antennas L≦
K to be combined at each one of the N beamformers, wherein K is a number of antennas connected to each one of the beamformers, based on the measured fading rate, wherein the selecting of said specific subset L is based on the total data throughput grades of the K antennas; andrepeatedly apply a tuning process to L antennas at each of the N beamformers, wherein the tuning process comprises adjusting a phase of each of said L antennas to maximize a TDTI. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification