Tremain equiangular tight frames
  Equiangular tight frames provide optimal packings of lines through the origin. We combine Steiner triple systems with Hadamard matrices to produce a new infinite family of equiangular tight frames. This in turn leads to new constructions of strongly regular graphs and distance-regular antipodal covers of the complete graph. 
Matthew Fickus, John Jasper, Dustin G. Mixon, Jesse Peterson
math.FA cs.IT math.CO math.IT