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System and method for discrete gain control in hybrid MIMO/RF beamforming

  • US 8,948,327 B2
  • Filed: 12/30/2013
  • Issued: 02/03/2015
  • Est. Priority Date: 05/29/2012
  • Status: Expired due to Fees
First Claim
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1. A multiple-input-multiple-output (MIMO) receiving system comprising:

  • a MIMO baseband module having N branches; and

    a radio distribution network (RDN) connected to the MIMO baseband module, comprising a plurality of beamformers, each of said beamformers fed by two or more associated antennas, so that a total number of antennas in the system is M, wherein M is greater than N,wherein each one of the beamformers includes a passive combiner configured to combine signals coming from the antennas associated with the beamformer into a combined signal,wherein at least one of said beamformers is further configured to selectively amplify or attenuate in discrete steps, one or more of the signals coming from the M antennas prior to entering the passive combiners, based on one or more qualitative metrics measured by the MIMO baseband module.

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