% -*- texinfo -*-
% @deftypefn {Function File} {@var{msg} =} qaskdeco (@var{c},@var{m})
% @deftypefnx {Function File} {@var{msg} =} qaskdeco (@var{inphase},@var{quadr},@var{m})
% @deftypefnx {Function File} {@var{msg} =} qaskdeco (@var{...},@var{mnmx})
%
% Demaps an analog signal using a square QASK constellation. The input signal
% maybe either a complex variable @var{c}, or as two real variables
% @var{inphase} and @var{quadr} representing the in-phase and quadrature
% components of the signal.
%
% The argument @var{m} must be a positive integer power of 2. By deafult the
% same constellation as created in @dfn{qaskenco} is used by @dfn{qaskdeco}.
% If is possible to change the values of the minimum and maximum of the
% in-phase and quadrature components of the constellation to account for
% linear changes in the signal values in the received signal. The variable
% @var{mnmx} is a 2-by-2 matrix of the following form
%
% @multitable @columnfractions 0.125 0.05 0.25 0.05 0.25 0.05
% @item @tab | @tab min in-phase @tab , @tab max in-phase @tab |
% @item @tab | @tab min quadrature @tab , @tab max quadrature @tab |
% @end multitable
%
% If @code{sqrt(@var{m})} is an integer, then @dfn{qaskenco} uses a Gray
% mapping. Otherwise, an attempt is made to create a nearly square mapping
% with a minimum Hamming distance between adjacent constellation points.
% @end deftypefn
% @seealso{qaskenco}