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Using subarrays of a beamformer for transmissions in a forward link

  • US 9,648,504 B2
  • Filed: 12/10/2013
  • Issued: 05/09/2017
  • Est. Priority Date: 12/10/2013
  • Status: Active Grant
First Claim
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1. A method for transmitting data over an angular range of an array antenna in a wireless communications system, comprising:

  • generating two parallel signals, each of the parallel signals associated with the data;

    forming a first subarray from a first set of array elements of an array antenna;

    forming a second subarray from a second set of array elements of the array antenna;

    selecting a first set of beamforming weights for the first subarray and a second set of beamforming weights for the second subarray, the selected beamforming weights causing a power radiation pattern of the first subarray to be complementary to a power radiation pattern of the second subarray over the angular range of the array antenna, wherein the selected beamforming weights are based at least in part on a recursive relation that includes an iterative calculation that increases a calculated number of beamforming weights from an initial set of beamforming weights to a desired number of beamforming weights, the desired number of beamforming weights being equal to a number of elements in the respective subarray;

    transmitting, according to the first set of beamforming weights, a first of the parallel signals over the angular range of the array antenna via the first subarray; and

    transmitting, according to the second set of beamforming weights, a second of the parallel signals over the angular range of the array antenna via the second subarray.

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