Orthogonal precoding is a promising, linear technique in which the null space of a precoding matrix with orthonormal columns is designed to suppress the sidelobes.  However, orthogonal precoders suffer from high arithmetic complexity which has limited their application.  UQ research has established that the arithmetic complexity can be made linear instead of quadratic if a block reflector or generalised Householder transformation is used to perform the orthogonal precoding instead of the otherwise unstructured unitary transformation.

Key features

  • applications in digital communication signalling in DSL, cable broadband, wireless LAN, digital video and audio broadcasting, 4G/5G/LTE mobile communications
  • orthogonal precoding for sidelobe spectrum suppression is an advanced system for digital communications
  • orthogonal precoding is used in discrete Fourier transform (DFT) based communication systems or devices
  • communication systems based on DFT include orthogonal frequency-division multiplexing (OFDM) and single-carrier frequency-division multiple access (SC-FDMA).


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