只需对 QAM 信号（可能在匹配滤波之后）进行成帧，就可以创建眼图，其中帧长度是每个 QAM 符号的样本数。在 MATLAB 中，这非常简单：

x = output_of_matched_filter;
N = number_of_samples_per_symbol;
eye = reshape(x,N,[]);
% "eye" now is a two-dimensional matrix, with each column containing one trace
% to plot on the eye diagram. you can then plot all of the traces with:
plot(eye);

注意：调用reshape要求 的长度x是 的倍数N。如果还没有，则需要对数组进行切片以使其为真：

nsyms = floor(length(x)/N);
eye = reshape(x(1:nsyms*N),N,nsyms);