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Wireless communications apparatus

  • US 8,442,590 B2
  • Filed: 01/13/2009
  • Issued: 05/14/2013
  • Est. Priority Date: 03/14/2008
  • Status: Expired due to Fees
First Claim
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1. A method of determining a beamforming vector for use in wireless communication involving apparatus comprising a plurality of antennas, each being suitable for emitting a wireless signal, including determining said beamforming vector on the basis of a measure of transmission channel to a given receiver, said measure being expressible in the form of a channel matrix, the determining including determining an eigen-beamformer vector from said channel matrix and, for a number of iterations wherein the initial iteration is performed on a vector being said eigen-beamformer vector,rotating said eigen-beamformer vector into a reference direction in vector space to produce a rotated eigen-beamformer vector whose application would result in peak radiation being directed in said reference direction,sampling a radiation pattern associated with said rotated eigen-beamformer vector with respect to transmission direction,compressing the samples obtained from sampling the radiation pattern to reduce spatial directivity induced by said rotated eigen-beamformer vector,developing a rotated candidate beamformer on the basis of said compressed samples and returning said rotated candidate beamformer to the orientation of said eigen-beamformer vector before said rotating, thereby to produce a resultant vector andstoring said resultant vector as a candidate vector;

  • then comparing said candidate vectors for said iterations and selecting that for use which best meets one or more selection criteria.

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