reg [7:0]data; 
initial begin
     #10 clk =0;
    forever #4 clk = ~clk;
 end
 initial begin
     #20 rst=1;
     #20 rst=0;
 end
reg [7:0]data_sin[160000:0];  ////改动点数据矩阵长度设置
integer i;
    initial  
        begin  
            i=0;
            begin  
            $readmemb("D:/Chapter_8/E8_1_QAMModem/QAM.txt",data_sin,0,160000); ///改动点数据矩阵长度  注意是“/”  而不是“\”
            end  
            forever
            begin
                @(posedge clk)
                    begin
                        i <= i+1;
                        din <= data_sin[i];
                    end
            end
        end 
endmodule

matlab 写txt文本的代码

fid = fopen('data.txt','w');
for oo=1:1:i
if mod(oo,10) == 0
fprintf(fid,'%f,%f,\n',sI1(oo),sQ1(oo));
else
fprintf(fid,'%f,%f,',sI1(oo),sQ1(oo));
end
end
fclose(fid);

verilog 对应的写文件，写入IQ数据

integer file_out;
initial
begin
    file_out = $fopen("mI.txt");
    if (!file_out) begin
        $finish;
    end
end            

wire signed [23:0] dout_s = fifo_fft_data[47:24];

always @ (posedge clk) 
begin  
    if(fifo_fft_valid)
    $fdisplay(file_out, "%d", dout_s);
end

integer file_out_Q;
initial
begin
    file_out_Q = $fopen("mQ.txt");
    if (!file_out_Q) begin
        $finish;
    end
end            

wire signed [23:0] dout_s_Q = fifo_fft_data[23:0];

always @ (posedge clk) 
begin  
    if(fifo_fft_valid)
    $fdisplay(file_out_Q, "%d", dout_s_Q);
end

对应以上文件的matlab 读取数据：

%读取FPGA仿真出的数据
clc;
clear;close all;

fid=fopen('mI.txt','r');
[di,N]=fscanf(fid,'%lg',inf);
fclose(fid);
fid=fopen('mQ.txt','r');
[dq,N]=fscanf(fid,'%lg',inf);
fclose(fid);
exp1=di+dq*1i;
% exp2 = exp1(25000:30000);
% exp2 = exp1(1024:8192);
exp2 = exp1;
plot(di);
figure;
plot(dq);
figure;
plot(20*log10(abs(fft((exp2).* window(@gausswin,length(exp2),4)))));