Function: qam4

QAM4  Quadrature amplitude modulation of order 4
  Usage:  xo=qam4(xi);

  QAM4(xi) converts a vector of 0's and 1's into the complex roots of
  unity (QAM4 modulation). Every 2 input coefficients are mapped into 1
  output coefficient.

Url: http://ltfat.github.io/doc/sigproc/qam4.html

See also: iqam4, demo_ofdm.

Package: ltfat