estimationerror.m

这是一个关于完成QAM调制的Matlab示例程序

function [rxMsg] = EstimationError(idealRxMsg,phaseError,dopplerError)

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% function [rxMsg] = Channel(modMsg,gammaBar)
% This function models the receiver channel estimation errors.  As such, it will
% take idealRxMsg, and apply the various error effects.
%
% idealRxMsg = baseband received message before error simulation
% phaseError = amount of phase error to be applied, in radians.  Can
%              be any real value.
% dopplerError = doppler error per sample, in cycles per sample
% rxMsg = received message with estimation error effects applied
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

if ((phaseError == 0) & (dopplerError == 0))
    rxMsg = idealRxMsg;
else
	if (phaseError ~=0)
        rxMsg = idealRxMsg * exp(j*phaseError);
	end
	if (dopplerError ~=0)
        rxMsg = idealRxMsg.*exp(j*2*pi*dopplerError*((1:length(idealRxMsg))-1));
	end
end

return