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Calibration of MIMO systems with radio distribution networks

  • US 8,885,757 B2
  • Filed: 12/11/2013
  • Issued: 11/11/2014
  • Est. Priority Date: 05/29/2012
  • Status: Expired due to Fees
First Claim
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1. A system comprising:

  • a multiple-input-multiple-output (MIMO) receiving system comprising a MIMO baseband module having N branches;

    a radio distribution network (RDN) connected to the MIMO receiving system with an antenna array of K antennas, the RDN comprising at least one beamformer with k weighting circuits and one radio frequency (RF) signal combiner configured to combine signals coming from the antennas feeding the respective beamformer into a combined signal, wherein k, K and N are positive integers and wherein k is greater than 1 and K is greater than N, wherein the RDN is tuned for optimal performance using channel estimation of individual contributing antennas of the RDN;

    a signal processing control module configured to;

    tune the K antennas, wherein the tuning is carried out based on RDN calibration data; and

    generate said RDN calibration data, based on at least one of;

    offline and real time procedures for eliminating or reducing systematic errors and unpredictable errors,wherein the calibration is carried out as follows;

    using a given beamformer antenna for receiving, while disconnecting other antennas in the same beamformer;

    channel estimating the signals received from a serving transmitting station;

    for each possible phase and gain setting, for each possible switch setting, and for each possible combiner;

    selecting as an anchor or reference point one of said settings, and comparing the channel estimations for all other selected settings to the anchor'"'"'s channel estimation;

    creating a calibration table using a deviation between the anchor setting and other settings; and

    repeating the calibration process for all antennas and for all beamformers in the RDN.

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