Initialization

创建一个powermeterobject with a sliding window of length 16 samples and a reference load of 50 ohms. Use this object to measure the average power of a 256 QAM signal indBmunits.

Visualize the average power of the signal using thetimescopeobject.

FrameLength = 512; Fs = 1000; pm = powermeter(16,'Measurement','Average power',...'ReferenceLoad', 50,...'PowerUnits','dBm'); scope = timescope('SampleRate',Fs,...'TimeSpanSource','property',...'TimeSpan',20,...'YLabel','dBm',...'YLimits',[0 50]); title ='Average power based on a sliding window of 16 samples'; scope.Title = title;

Compute the Average Power

Generate a sequence of pseudorandom integer values drawn uniformly from [0 255] using therandifunction. Apply quadrature amplitude modulation (QAM) on this signal using theqammodfunction. Compute the average power of this signal using thepowermeterobject. View the computed average using thetimescopeobject.

tic;while(toc < 5) x = randi([0 255], FrameLength, 1); y = qammod(x, 256); averagePower = pm(y); scope(averagePower);end