phasemap.m

simulation module for visual wireless sensor network

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%% CalcPhase - function %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% This function calculates the phase shift associated with a given symbol %
% vector.                                                                 %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function Phase = PhaseMap(BitVector)
% Gotta be this way since the switch statement in MATLAB does not support
% vector inputs !!
switch BitVector(1)
case 0,
   switch BitVector(2)
   case 0, % [0,0] case
      Phase = pi/4;
   case 1, % [0,1] case
      Phase = 3*pi/4;
   end
case 1,
   switch BitVector(2)
   case 0, % [1,0] case
      Phase = -pi/4;
   case 1, %[1,1] case
      Phase = -3*pi/4;
   end  
end