Autocorrelation and power spectrum of Hadamard signalling
Stephen G. Wilson, M. Lakshman · IEE Proceedings F Communications Radar and Signal Processing · 1988
The paper presents results for the autocorrelation and power spectrum of digital modulation for M-ary orthogonal and biorthogonal signal sets based on binary Hadamard matrices. Such signal sets provide easily-mechanised orthogonal (and related) constructions, and are important in coded signalling for jammed and/or fading channels using large-alphabet codes.